KR20190043093A - Color generating composition, and cosmetic composition or refractive index sensor - Google Patents

Abstract

The present invention, as a color developing composition comprising a combination of a plurality of particles of different sizes dispersed in a medium, relates to a color developing composition and uses thereof, wherein size distribution of the particles has polydispersity, and the color development of the color developing composition is controlled by adjusting at least one among the size of each particle, the size distribution of the particles, the dielectric constant of the particles, and the dielectric constant of the medium.

Description

TECHNICAL FIELD [0001] The present invention relates to a coloring composition, and a cosmetic composition or a refractive index sensor comprising the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a color-forming composition comprising a combination of a plurality of particles of different sizes dispersed in a medium, the color development of which is controlled according to the conditions of the particles, and the use thereof.

The generation of colors in submicron size structures can be achieved using a display [Yokogawa, S .; Burgos, S. P .; Atwater, H. A. Plasmonic Color Filters for CMOS Image Sensor Applications. Nano Lett. 2012, 12 (8), 4349-4354.) To subwavelength biomedical imaging. Nanostructures can manipulate intensity and phase of light by altering scattering and absorption at the most basic level. In general, the assembly of the same nanostructures creates certain wavelengths of color through radioactive electron excitation or optical resonance, since destruction of the uniformity of the structure results in undesired color wavelengths, broad spectral response, and color purity degradation . This is especially true for quantum dots, plasmon metal gratings, or subwavelength scattering structures. In order to produce structures of the same size, a lithography top-down manufacturing method is generally required, which is long and costly to manufacture. For a practical, scalable, and cost-effective approach, solution-based synthesis is an attractive alternative, but it is difficult to use in sub-wavelength structures for color generation because it is difficult to fabricate structures of the same size.

On the other hand, extinction measurements provide the possibility for index measurements, but according to conventional techniques, this technique has not been widely used for index measurements because there is no suitable scattering agent to provide a high level of index contrast between different media .

In addition, various colors due to the intrinsic extinction characteristics provide the possibility of distinguishing the functions of cosmetics. However, among the substances having such extinction properties, it is difficult to mix them with cosmetic ingredients because of the harmless and stable scattering agent.

The present invention provides a color-forming composition comprising a combination of a plurality of particles of different sizes dispersed in a medium, wherein the size distribution of the particles is polydispersity, and the size of each of the particles, the size distribution of the particles, The dielectric constant of the particle, and the dielectric constant of the medium, thereby controlling the color development of the color-forming composition, and uses thereof.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to a first aspect of the invention, there is provided a color-forming composition comprising a combination of a plurality of particles of different sizes dispersed in a medium, the size distribution of the particles having polydispersity, the size of each of the particles, Wherein the color development of the color-forming composition is controlled by controlling at least one of a size distribution of the particles, a dielectric constant of the particles, and a dielectric constant of the medium.

The second aspect of the present invention provides a cosmetic composition comprising the color-forming composition according to the first aspect of the present invention.

A third aspect of the invention provides a refractive index sensor comprising a color-forming composition according to the first aspect of the invention.

In one embodiment of the present invention, calculation of single particle Mie of TiO ₂ particles close to micron size can predict predominant strong light scattering in the visible light region causing white coloration. In one embodiment of the present application, it can be shown that a polydisperse collection of such " white " particles can produce visible colors through ensemble scattering. The weighted average of the scattering over the particle size distribution is evident by the wide variation from each particle in the aggregate extinction, and can modify the multi- and high-order scattering modes. Such a quenching change can be evidently expressed as visible light color for a single layer of particles supported on a transparent substrate in front of a low concentration of dispersed particles or a white light source in an organic solvent.

In one embodiment of the present disclosure, micron-sized TiO ₂ particles are used as a stable and robust agent for detecting an optical index of a homogeneous medium of high contrast sensitivity using color change of light sensitivity to the surrounding environment Lt; / RTI > This distribution-controlled scattering property can provide an exciting opportunity for TiO ₂ particles to impart color and optical sensitivity to a wide range of electronic and chemical platforms such as antimicrobial windows, catalysts, photocatalysts, optical sensors, and photovoltaic devices.

1 illustrates, in one embodiment, a color generation mechanism for the collection of polydisperse particles, wherein a combination of several sets of monodisperse " white " particles of different sizes provides a smooth transition of quenching in the visible range ≪ / RTI >
2A to 2D are SEM images (scale bars: 1 μm) of TiO ₂ particles corresponding to an average diameter of 351 nm, 518 nm, 796 nm, and 1,082 nm, respectively, in one embodiment of the present invention Is an optical image of an optical image of particles in ethanol dried on a glass slide, viewed from the front of the white LED light source (scale bar of the inset: 1 cm).
Figures 3A-3D illustrate measured size distributions of a set of particles having a 20 nm sized bins in one embodiment of the present invention, wherein the solid line represents the normal fit to the distribution.
4A and 4B show X-ray diffraction spectra and FTIR spectra of TiO ₂ particles (red) and TiO ₂ particles (black) TiO ₂ particles before annealing, respectively, after annealing in the embodiment of the present invention, Is an image of the synthesized TiO ₂ precipitate before and after thermal annealing at 500 ° C for 3 hours in air.
Figure 5 shows quenching for monodisperse TiO ₂ particles in one embodiment of the present invention, showing the calculated quenching probability for a single TiO ₂ particle as a constant of wavelength and diameter, and 1, 2, 3 , And dashed lines denoted by 4 represent diameters of 351 nm, 518 nm, 796 nm, and 1,082 nm, respectively.
Figure 6 shows quenching for monodisperse TiO ₂ particles in one embodiment of the invention, showing scatter (black) and absorption (red) efficiency for the four particles.
Figures 7A through 7D illustrate extinction for polydispersed TiO ₂ particles in air having an average diameter of 351 nm, 518 nm, 796 nm, and 1,082 nm, respectively, in one embodiment of the invention, wherein TiO ₂ The extinction spectrum (black) measured and the extinction spectrum (blue) calculated for the set of particles.
As Figure 8a to Figure 8d, in the one embodiment of the invention, showing the extinction of each 351 nm, 518 nm, 796 nm, and the dispersed TiO ₂ particles in the air having a mean diameter of 1,082 nm, respectively, of The cross section is the calculated diameter as a constant of the diameter and the wavelength weighted by the size distribution.
Figure 9a through 9d are, in one embodiment of this disclosure, the size of, the particles each an average diameter of 351 nm, 518 nm, 796 nm, and 1082 nm as shown the quenching transformation of the TiO ₂ particles in accordance with the background index The calculated Mie extinction probability, weighted by the respective size distribution as a constant of the index and wavelength, and the dotted line represents the refractive index of 1.36 representing ethanol.
10 (a) to 10 (d) show the extinction (black) and the calculated extinction (blue) of the low-concentration TiO ₂ particles dipped in ethanol in an embodiment of the present invention, An optical image of the solution measured in front of the light source.
11A-11C illustrate, in an embodiment of the present invention, TiO ₂ particles (left) about 1082 nm in size, Au nanoparticles about 50 nm in size (medium), and about 400 nm in size Wherein the dotted line represents a calculated Mie extinction probability, weighted by a respective size distribution, as a constant of wavelength and index of refraction, to indicate the light sensitivity of the SiO ₂ particle (right) , 1.36 (ethanol), and 1.43 (DMF), and each pair of optical images in the bottom view water, ethanol, and scattering agent in DMF in front of indirect light (left) and direct light (right).
12A-12C illustrate, in one embodiment of the present invention, TiO ₂ particles (left) about 1082 nm in size, Au nanoparticles about 50 nm in size (middle), and about 400 nm (Top) and calculated extinction (bottom) measured from the scattering agent in water (black), ethanol (red), and DMF (blue) to show the light sensitivity of the SiO ₂ particles .
Figure 13a and Figure 13b, according to one embodiment of the present application, each of the ethylene glycol with TiO ₂ prepared using the particles and a SEM image of a TiO ₂ particles prepared without ethylene glycol (upper, scale bars: 1 μm), and indirect (Bottom) immersed in ethanol at a concentration of 1.25 mM seen from the front (left) and the right (right) of the light.
14 is an XRD spectrum of a set of TiO ₂ particles with average diameters of 351 nm, 518 nm, 796 nm, and 1,082 nm annealed at 500 ° C for 3 hours, Showed anatase crystal structure.
15 is a white LED spectrum used to visually observe the hue of a particle in one embodiment of the present invention.
FIG. 16 shows an optical image of a solution prepared so as to increase the concentration to the right in order to show quenching dependence on the concentration in one embodiment of the present invention. The lower the concentration, the clearer the color, and the higher Concentration results in visible color loss due to multiple scattering and aggregation
17 shows the degree of extinction measured according to the concentration of each solution in one embodiment of the present invention, and the absolute extinction degree was increased at a high concentration.
18 is a diffuse reflection spectrum of a set of TiO ₂ particles having an average diameter of 351 nm, 518 nm, 796 nm, and 1,082 nm, in one embodiment of the invention.
Figure 19 shows that, for one embodiment of the invention, the Kubelka-Munk constant for four sets of particles represents a band gap energy of about 3.18 eV.
Figure 20 is an N ₂ adsorption and desorption isotherm for TiO ₂ particles in one embodiment of the invention.
FIG. 21 is an image of TiO ₂ particles having a size of about 1,082 nm immersed in PDMS in an embodiment of the present invention, viewed from the front side of indirect light (left side) and the right side (right side).
Figure 22 shows extinction (black) and calculated extinction (blue) measured from about 1,082 nm sized TiO ₂ particles immersed in PDMS in one embodiment of the invention, wherein the calculated fidelity was 1.41, ≪ / RTI >
23 is a graph illustrating the Mie extinction probability calculated by (c) weighted distribution by a constant of diameter and wavelength in an embodiment of the present invention.
Figures 24A-24F show that in one embodiment of the present invention, anatase phases corresponding to an average diameter of 464 nm, 671 nm, 705 nm, 346 nm, 402 nm, and 580 nm, respectively, synthesized for use in cosmetic compositions SEM image of TiO ₂ particles (scale bar: 1 μm).
25 is an SEM image (scale bar: 10 μm) of anatase phase TiO ₂ particles corresponding to an average diameter of 883 nm synthesized for use in FIG. 26 (A) in one embodiment of the present invention.
26 is a graph showing the extinction characteristics when the TiO ₂ particles are concentrated to 0.2 M, 0.02 M and 0.03 M, respectively, on a commercially purchased toner (left side of Dr. Geo Co., Ltd.) (A) and about 402 nm (B) size TiO ₂ nanoparticle scattering agent for indirect light.
Figure 27a to Figure 27c is, in one embodiment of the invention, each road in accordance with each print order of the different concentrations of 26, about 883 nm (left) and about 402 nm (right) mixing the amount of TiO ₂ nano-particle scattering agent This is a photograph taken in front of a direct sunlight.
28 is a graph showing the relationship between the amount of the toner and the amount of the toner added to 5 mL of commercially available toner (manufactured by Dr. Geo Co., Ltd.) in the embodiment of the present invention from the left side at 464 nm, 671 nm, 705 nm, 346 nm, In order to show extinction of the harmless toner concentrated to 0.002 M in the anatase phase TiO ₂ particle corresponding to the average diameter, it is a photograph taken in front of direct sunlight.

Hereinafter, embodiments and examples of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments and examples described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

As used herein, the terms " about, " " substantially, " and the like are used herein to refer to or approximate the numerical value of manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure.

The term " step " or " step of ~ " as used throughout the specification does not imply " step for.

Throughout this specification, the term " combination (s) thereof " included in the expression of the machine form means a mixture or combination of one or more elements selected from the group consisting of the constituents described in the expression of the form of a marker, Quot; means at least one selected from the group consisting of the above-mentioned elements.

Throughout this specification, the description of "A and / or B" means "A or B, or A and B".

Throughout the present specification, the description of " polydispersity " means that the particle size distribution has a normal distribution.

Hereinafter, embodiments and examples of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments and examples and drawings.

According to a first aspect of the invention, there is provided a color-forming composition comprising a combination of a plurality of particles of different sizes dispersed in a medium, the size distribution of the particles having polydispersity, the size of each of the particles, Wherein the color development of the color-forming composition is controlled by controlling at least one of a size distribution of the particles, a dielectric constant of the particles, and a dielectric constant of the medium.

In one embodiment of the present invention, the extinction probability of each of the particles expressed by the following equation (1) and the extinction probability of the combination of the plurality of particles expressed by the following equation (2) To thereby control the color development of the color-forming composition. However, the present invention is not limited thereto.

[Equation 1]

;

;

&Quot; (2) "

;

;

In the above equations, C _ext and C _{poly, ext} are, respectively, the extinction probability of the particle (single particle) and the polydispersity aggregate of the particle, f is the size distribution of the particle, and s is the diameter of the particle.

In one embodiment of the invention, the medium may comprise, but is not limited to, air, gas, or solvent. For example, when the bleaching composition according to one embodiment of the invention is coated on a substrate, the medium can be air. For example, the solvent may be water, ethanol, or dimethylformamide, but is not limited thereto.

In one embodiment herein, the plurality of particles of different sizes may be in a size range of from about 50 nm to about 10 μm, but are not limited thereto. For example, the metal oxide particle size distribution ranges from about 50 nm to about 10 μm, from about 50 nm to about 5 μm, from about 50 nm to about 1 μm, from about 50 nm to about 800 nm, from about 50 nm to about From about 50 nm to about 100 nm, from about 50 nm to about 100 nm, from about 100 nm to about 10 μm, from about 300 nm to about 10 μm, from about 500 nm to about 10 μm From about 500 nm to about 10 μm, from about 700 nm to about 10 μm, from about 900 nm to about 10 μm, from about 1 μm to about 10 μm, from about 5 μm to about 10 μm, from about 100 nm to about 8 μm, From about 500 nm to about 4 占 퐉, from about 700 nm to about 2 占 퐉, or from about 900 nm to about 1,000 nm.

In one embodiment of the invention, the particles may include, but are not limited to, materials having a band gap in the range of UV energy or less. The bandgap in the range below the UV energy includes a visible broadband range, but may be, for example, about 3 eV or less, but is not limited thereto.

In one embodiment of the invention, the particles may comprise a material selected from the group consisting of oxides, nitrides, carbides, oxynitrides, carbonitrides, and combinations thereof comprising one or more metallic elements, But is not limited thereto. For example, the particles are TiO _2, ZnO, BaTiO _3, diamond, SiC, BN, AlN, the GaN, ZnS, CuCl, SnO _2, SrTiO _3, LiNbO _3, NiO, MgO, ZrO _2, and combinations thereof But are not limited to, those selected from the group consisting of < RTI ID = 0.0 >

In one embodiment of the invention, the average size of the particles may be in the submicron to micron range, but is not limited thereto. For example, if the average size of the particles is in the sub-micron range, it may mean that the particles have an average size of about 100 nm to about 1,000 nm, and if the mean size of the particles is in the sub- But is not limited to, that the particles have an average size of about 1 [mu] m to about 10 [mu] m.

In one embodiment of the invention, the particles may be spherical, but are not limited thereto. Also, the particles according to one embodiment herein may include, but are not limited to, pores. For example, when the particles include a pore, a change in the refractive index may be required to change the size distribution of particles having pores in order to exhibit the same color as the particles having no pores.

The color-changing composition according to one embodiment of the present invention may be one in which the color development varies depending on the refractive index of the particles. In addition, the refractive index of the particles may vary depending on conditions selected from the group consisting of the kind of the particles, the average size of the particles, the porosity of the particles, the content of the organic functional groups, and combinations thereof, It is not.

For example, the particles may comprise TiO ₂ , the refractive index of the particles under visible light may be from about 2.2 to about 3.2, and, independently of each other, yellow when the average size of the particles is about 351 ± 20 nm, (Navy blue) can be developed when the average size of the particles is about 518 ± 20 nm, and magenta is developed when the average size of the particles is about 796 ± 50 nm And the teal may be developed when the average size of the particles is about 1,082 +/- 100 nm, but is not limited thereto. At this time, the medium may be air, but is not limited thereto.

In one embodiment of the present invention, the particles may contain organic functional groups, but are not limited thereto. For example, the organic functional group may be acetylacetone (acac) or the like, but is not limited thereto.

In one embodiment of the invention, the color forming composition may be used in cosmetic compositions, antimicrobial windows, catalysts, photocatalysts, optical sensors, or photovoltaic devices, but is not limited thereto. For example, in the case of the cosmetic composition, the color-forming composition may develop a specific color to absorb and / or block UV and / or UV. In the case of the antimicrobial window, the color- So that it can be utilized as a transparent window having an antibacterial function. For example, in the case of the catalyst or the photocatalyst, the coloring composition can be used as a coloring catalyst or a photocatalyst. In the case of the optical sensor, the particles contained in the coloring composition are combined with a functional dye In the case of the photovoltaic device, the device can be used as an element that generates a color similar to that of a dye-sensitized device and absorbs light to generate electrons / majors.

In one embodiment of the present invention, the particles may exhibit ultraviolet shielding and / or photocatalytic performance in addition to the color development, but are not limited thereto, wherein the particles are preferably TiO ₂ , It is not.

According to one embodiment of the present application, an alternative method of achieving color using strong scattering of TiO ₂ particles close to micron size through the use of polydispersity is presented. A single TiO ₂ particle close to the micron size will scatter white light indiscriminately over the visible range, while a collection of " white " particles of different size and population populations, as shown schematically in Figure 1 It shows visible color. The generation of polydisperse particles with a general size distribution is naturally obtained through a hydrothermal process, which presents a cost-effective, scalable, and practical way of representing color without using a cleanroom manufacturing method. Visible light colors are due to gentle changes in wavelength in the extinction spectrum due to ensemble averaging of Mie scattering from discrete particles of different sizes.

The second aspect of the present invention provides a cosmetic composition comprising the color-forming composition according to the first aspect of the present invention.

The cosmetic composition according to the second aspect of the present invention can be applied to all of the components described above for the coloring composition according to the first aspect of the present invention, and a detailed description of the overlapping parts is omitted, The same can be applied.

In one embodiment of the invention, the color-forming composition may comprise particles selected from the group consisting of oxides, nitrides, carbides, oxynitrides, carbonitrides, and combinations thereof comprising one or more metal elements , But is not limited thereto. For example, the particles are TiO _2, ZnO, BaTiO _3, diamond, SiC, BN, AlN, the GaN, ZnS, CuCl, SnO _2, SrTiO _3, LiNbO _3, NiO, MgO, ZrO _2, and combinations thereof But are not limited to, those selected from the group consisting of < RTI ID = 0.0 >

In one embodiment of the invention, the average size of the particles may be in the submicron to micron range, but is not limited thereto. For example, if the average size of the particles is in the sub-micron range, it may mean that the particles have an average size of about 100 nm to about 1,000 nm, and if the mean size of the particles is in the sub- But is not limited to, that the particles have an average size of about 1 [mu] m to about 500 [mu] m.

For example, the average size of the particles included in the cosmetic composition may range from about 100 nm to about 1,000 nm, or from about 1 [mu] m to about 500 [mu] m, but is not limited thereto.

In one embodiment of the present invention, the cosmetic composition may exhibit color development and ultraviolet shielding performance by the particles, but is not limited thereto. The refractive index is changed according to the size of the particles and the coloring and ultraviolet blocking performance of the cosmetic composition can be controlled as the refractive index is changed. For example, under visible light, the refractive index of the particles is from about 2.2 to about 3.2, and each of the cosmetic compositions independently produces a yellow color when the average size of the particles is about 351 20 nm, Navy blue is developed when the average size is about 518 ± 20 nm and magenta is produced when the average size of the particles is about 796 ± 50 nm and the average size of the particles is about 1,082 ± 100 The cyan (teal) color may be developed, but is not limited thereto.

In one embodiment of the present invention, the cosmetic composition may include generally known cosmetic ingredients, and even when the coloring composition is added to and mixed with the cosmetic ingredients, the coloring composition may exhibit various extinction properties . For example, the cosmetic ingredient may be at least one selected from the group consisting of purified water, dipropylene glycol, glycerin, Centella asiatica extract, Peppermint extract, Ginseng leaf / stem extract, Drumstick leaf extract, Locust bark / leaf / twigs extract, / Leaf / stem extract, tapioca flavor, hydrolyzed corn starch, beet root extract, ceramide insert, golden extract, sodium hyaluronate, beta-glucan, ylang ylang flower oil, bergamot fruit oil, Sodium hyaluronate cross polymer-3, caprylic / capric triglyceride, phage-60 hydrogenated castor oil, octyldodecanol, hydrogenated lecithin, ammonium acrylate Ethylhexyl glycerin, glyceryl caprylate, butyleneglycol, disodium iodide, hydroxyacetate, It sat benzophenone, but may be a xanthan gum, such as, without being limited thereto.

A third aspect of the invention provides a refractive index sensor comprising a color-forming composition according to the first aspect of the invention.

The refractive index sensor according to the third aspect of the present invention can be applied to all of the components described above with respect to the color composition according to the first aspect of the present invention and a detailed description of the overlapped portions is omitted, The same can be applied.

An index of refraction sensor according to one embodiment of the present invention is one in which the color forming composition comprises particles selected from the group consisting of oxides, nitrides, carbides, oxynitrides, carbonitrides, and combinations thereof comprising one or more metal elements But is not limited thereto. For example, the particles are TiO _2, ZnO, BaTiO _3, diamond, SiC, BN, AlN, the GaN, ZnS, CuCl, SnO _2, SrTiO _3, LiNbO _3, NiO, MgO, ZrO _2, and combinations thereof But are not limited to, those selected from the group consisting of < RTI ID = 0.0 >

In one embodiment of the invention, the average size of the particles may be in the submicron to micron range, but is not limited thereto. For example, if the average size of the particles is in the sub-micron range, it may mean that the particles have an average size of about 100 nm to about 1,000 nm, and if the mean size of the particles is in the sub- But is not limited to, that the particles have an average size of about 1 [mu] m to about 500 [mu] m.

For example, the average size of the particles included in the cosmetic composition may range from about 100 nm to about 1,000 nm, or from about 1 [mu] m to about 500 [mu] m, but is not limited thereto.

11a, 21 and 22, the refractive index sensor according to an embodiment of the present invention can achieve excellent performance as a refractive index sensor by changing extinction spectrum according to the refractive index difference of the color-forming composition.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

[ Example ]

The extinction behavior of the metal oxide particles according to the invention further demonstrates a high scattering sensitivity to the optical environment. For rapid evaluation of the optical index, data acquisition through one parameter (i.e., wavelength) would be desirable. Extinction measurements provide this possibility, but according to conventional techniques, this technique has not been widely used in index measurements because there is no suitable scattering agent to provide a high level of index contrast between different media. In this example, it can be seen that through the extinction of the TiO ₂ particles according to the present invention, the index difference [Delta] n, which is as small as about 0.03, can be analyzed corresponding to a 2.2% upper limit on the sensitivity to index contrast. For comparison, extinction measurements of plasmon and dielectric particles, which are known to exhibit medium-dependent scattering behavior, have been shown to provide poor index contrast due to lack of quenching in wavelength.

The TiO ₂ particles are characterized in that they have a high refractive index and a large band gap and that the photophysical properties and synthesis methods of the TiO ₂ particles are suitable for use as catalysts, photocatalysts, chemical sensing, photovoltaic cells, self-cleaning, It has been selected as a scattering agent because it has been extensively investigated over the past several decades due to its widespread use in absorbents. Adjusting the color while maintaining the chemical and electrical function of the TiO ₂ particles can promote the possibility of colored antimicrobial windows, colored transparent solar cells, or electromagnetic wave absorbers. The present inventors have recently found a similar study to the observation of Mie-scattered color from TiO ₂ submicron particles, but did not find a detailed description of the principle of color generation. Although other metal oxides such as ZnO share a high bandgap and a high index of refraction herein, it is an experimental challenge to challenge submicron or micron sized particles using them in this embodiment. For example, ZnO particles that are close to the size of most microns are nano-sized particles that are aggregated. Upon annealing, the particles tend to crystallize into a non-spherical crystal facet structure, which can deviate from the high-order scattering mode and can complicate the analysis.

Example  One: TiO ₂  Particle synthesis

Size-regulated TiO ₂ particles with a smooth, uniform surface were prepared using the previously reported, modified one-pot solvent thermal non-aqueous technique. A mixture of isopropyl alcohol (IPA), acetone, and acetylacetone (acac) was prepared in a volume ratio of 1: 1: 0.5. Tetrabutyl orthotitanate (TBOT) was rapidly injected into the continuously stirred mixture solution and 20 mmol of ethylene glycol (EG) was added. The mixture was then transferred to a 50 mL Teflon-lined stainless steel autoclave for hydrothermal treatment in a programmable muffle furnace at 200 < 0 > C for 3 to 5 hours. The precipitate was collected by centrifugation, washed several times with ethanol, and then dried at 60 DEG C overnight. As shown in Figures 2A-2D, the SEM image of the precipitate powder showed soft, uniform particles close to micron size. In this example, it has been confirmed that the use of EG is necessary to ensure the formation of a smooth particle surface (Fig. 13A), which results in an analytically processable scattering characteristic and a bright color appearance. In the absence of EG, the particles exhibited large surface roughness, resulting in reduced scattering intensity and poor color contrast (Fig. 13b). Particle size was controlled by varying the amount of TBOT and the reaction time.

2. Characterization

TiO ₂ X- ray diffraction (XRD) system the D / Max-2000 / PC diffraction TiO ₂ wherein the microspheres determined by performing a scan rate of 2 ° per minute in the (Cu Kα radiation, 298 K) of the microspheres (microsphere) Structure was measured. The morphology of the microspheres was examined by field emission scanning electron microscopy (FESEM, JEOL, JSM-6700F) at an accelerating voltage of 15 kV. Fourier transform infrared (FT-IR) spectra were collected in a potassium bromide (KBr) matrix ranging from 4000 cm ^-1 to 400 cm ^-1 using a Varian FTS-800 Scimitar series infrared spectrometer. The extinction measurement was carried out in an ultraviolet visible spectrophotometer model (UV-vis, SHIMADZU, UV-2450). The band gap energy was evaluated by UV-vis diffuse reflectance spectroscopy (UV-vis-NIR spectrophotometer, Cary 5000, Varian). Nitrogen adsorption isotherms were measured at 77 K on a Micromeritics volume adsorption analyzer (BELSORP mini II). Prior to measurement, the sample was evacuated under vacuum at a temperature of 423 K for 3 hours at the desorption port of the adsorption device.

3. Results

In order to study the optical properties of TiO ₂ particles theoretically and experimentally, it was necessary to obtain crystal particles of high composition purity so that a well-established optical constant could be used for the calculation. The particles of all sizes synthesized from the above method exhibited an amorphous phase without X-ray diffraction (XRD) peaks, as shown by the typical set of particles in Figures 4A and 4B. In order to convert the particles to a crystalline phase and to improve the purity of the composition, the particles were annealed in air at 500 DEG C for 3 hours. The XRD scan demonstrated the transformation of amorphous to crystalline phases through the appearance of diffraction peaks corresponding to the anatase structure (Figs. 4A and 4B). After annealing, all size set of particles showed anatase structure (Fig. 14).

The FTIR (Fourier Transform Infrared) spectrum before and after the heat treatment showed the presence and elimination of several organic functional groups contained in the particles, respectively (Fig. 4B). As shown in FIG. 4B, before the heat treatment, it is preferable to set the temperature at a temperature of 3,100 cm ^-1 to 3,600 cm ^-1 , 2,860 cm ^-1 , 2,939 cm ^-1 , 1,458 cm ^-1 to 1,575 cm ^-1 , 1,074 cm ^-1 to 1,360 cm ^-1 , and were able to observe a plurality of the characteristic FTIR peaks at 400 cm ^-1 to 900 cm ^-1. The strong and broad peak at 400 cm ^-1 to 900 cm ^-1 is characteristic of Ti-O / Ti-O-Ti lattice vibration in TiO ₂ crystals. Multiple oscillations at 1,074 cm ^-1 to 1,360 cm ^-1 may correspond to CO stretching at the residual end of the titanium alkoxide (-OC ₄ H ₉ ). The multiple peaks located at 1,458 cm ^-1 to 1,575 cm ^-1 are characterized by the combined CO vibrations [C═C- (C═O) and C═C- (C-) O-] of acac ligands attached to TiO ₂ to be. The band at 2,860 cm ^-1 and 2,939 cm ^-1 is due to the CH stretching vibrations from the alkyl groups bonded to the surface of the TiO ₂ particles. The broad peak at 3,100 cm ^-1 to 3,600 cm ^-1 corresponds to the vibration of the hydroxyl phase. The vibrations account for the residual organic groups in the synthesized TiO ₂ particles and cause yellow coloration as indicated by the dry powder (see also the inset of FIG. 4b). Once annealed, the powder turns white to suggest a reduction or elimination of organic functionality. This was confirmed by FTIR measurements showing the reduction or disappearance of all the peaks assigned to the organic groups (Fig. 2B). The sharp absorption peaks at about 2,345 cm <" ¹ > remaining before and after annealing of the particles are characteristic of surface adsorbed CO ₂ . The incomplete removal of the peaks at 1,373 cm ^-1 and 1,558 cm ^{-1 indicates} that the trace of residual organic compounds is still present in the annealed particles and that the refractive index of the particles should be lower than the refractive index of the pure anatase TiO ₂ particles do.

Besides the remaining organic matter, porosity can also contribute to a reduction in refractive index. A BET measurement of the particles was performed to obtain the porosity of the particles (Table 1). Pores smaller than 50 nm accounted for 5.5% of the particle volume. The effect of the porosity on the refractive index will be further discussed in the extinction analysis of this embodiment.

In Table 1 below, V _Total is the total pore volume at p / p ₀ = 0.99, V _Micro is the micropore volume (pupil width 2 nm or less) in the NLDFT plot, and V _Meso is the mesopore volume in the NLDFT plot (Pupil width 2 nm to 50 nm), and V _Macro is the macro-pore volume (pupil width 50 nm or more) on the NLDFT plot.

S _BET  (m ² / g) V _Total  ( cm ³ / g) V _Micro  ( cm ³ / g) V _Meso  ( cm ³ / g) V _Macro  ( cm ³ / g) 3.43 1.55 X 10 ^-2 0.07 X 10 ^-2 0.92 X 10 ^-2 0.56 X 10 ^-2 Volume ratio: ~ 5.5%

The particles dispersed on the glass slide or made of a low concentration solution can be seen in front of the white LED light source (source spectrum shown in Fig. 15), as shown in the inset of Fig. 2, the inset of Fig. 16, And showed distinct colors. At higher concentrations, multiple scattering or particle agglomeration reduced the effect and displayed a white appearance (Figures 16 and 17). In this embodiment, it has been found that, in the case of particles dispersed on a glass slide, the colors vary according to the average size of the particles. Figures 2a-2d show SEM images of a set of TiO ₂ particles having an average size of 351 ± 20 nm, 518 ± 20 nm, 796 ± 50 nm, and 1,082 ± 100 nm, respectively. As shown in the inset of Figures 2a-2d, the developed color of each of the set of particles dispersed and dried on the glass slide is yellow, navy blue, magenta, and teal ). The size distribution of each sample was obtained by measuring the diameters of 400, 366, 418, and 400 particles, respectively, in FIGS. 2A to 2D. The size distribution of each sample was obtained by measuring diameters of 400 particles, The bar graph is summarized. A normal distribution was fitted to the measurement.

To confirm that the hue is not due to differences in band-to-band absorption that may occur due to the complexation of the ac reactors with Ti atoms, diffuse reflectance spectroscopy and Kubelka-Munk analysis were performed to determine the band of all particle sizes Gap was determined. An indirect bandgap value of about 3.18 eV was found (Figs. 18 and 19), consistent with the reported values of anatase TiO ₂ . The consistent bandgap values obtained for all particle sets indicate that the color hue is due to differences in optical effects, not differences in electronic structure.

When the dispersed particles are viewed in the extinction array, the Mie quenching probability of a single TiO ₂ particle over the range of diameter and wavelength is analytically calculated in FIG. A dielectric function describing the remnants of organic matter and air pores in TiO ₂ was used, which was explained later in the discussion of collective extinction. At diameters less than 100 nm, quenching for a single particle is negligible at all wavelengths. For this reason, low concentrations of TiO ₂ nanoparticles below 100 nm in solution appear colorless. Most of the extinction modes above the diameter occur in a selected range of diameter and wavelength. Scattering and absorption for each particle size corresponding to the average diameter shown in Figures 3a-3d is shown in Figure 6. It was observed that extinction is essentially the same as scattering because the absorbance can be neglected at all wavelengths except the UV region.

As the diameter increased, an additional high order scattering mode was introduced into the spectrum and the number of sharp scattering peaks in the visible range increased. For particles of the largest size (1,082 nm), strong scattering occurred at almost all wavelengths. The color of the low concentration monodisperse particles of this size will appear white. Particles of size 351 nm, 518 nm, and 796 nm also exhibited sharp scattering peaks at various wavelengths. From this, similarly, it is expected that the aggregation of monodisperse particles of each size will appear white or light-colored respectively. This is in contrast to the visible light color observed in FIG. 1B. Here, the present embodiment shows that the main difference between the presence or absence of color is in the polydispersity of the TiO ₂ particles.

The extinction spectra measured for each set of particles dispersed from a low concentration solution of ethanol on a glass slide are shown in Figures 7A-7D, respectively, as the particle size increases. It is clear that the single-particle extinction probability calculated in Figs. 5 and 6 is significantly different from the extinction ratio. It can be seen that instead of a sharp plurality of extinction peaks found in one particle, it is possible to observe in the measurement that it is smooth, broad, and has few peaks. Understanding that the measured particles are polydisperse and exhibit the generalized size distribution characterized in Figures 3A-3D, the extinction is measured using the following equation:

(1)

(One)

(2)

(2)

Where C _ext and C _{poly, ext} are the Mie quenching probabilities of a single particle and a polydisperse aggregate, respectively. f is the particle size distribution, lambda is the wavelength, and s is the particle diameter. Figures 8A-8D illustrate the calculated Mie quenching, g (lambda, s), as a constant of diameter and wavelength weighted by an appropriate size distribution for each set of particles. It can be seen that the polydisperse size distribution plays an important role by controlling the extinction degree for each particle size. As shown in Equation 2, the Mie quenching spectra for each polydispersity size distribution is obtained by integrating the weighted extinction g (?, S) over the diameter. This resulted in the effect of softening the high-frequency scattering from individual particles and the wide variation of extinction in the visible range responsible for color display. Comparison of the spectra to the measured extinction showed good agreement for all sets of particle sizes. However, incomplete statistics that limit the exact determination of the actual particle size distribution can observe a model that predicts microscopic features that do not appear in the measurement, such as multiple peaks at 50 nm intervals in the 518 nm and 796 nm size sets, Respectively.

For analytical Mie calculations, the optical constants of the anatase TiO ₂ conventionally found have been modified to indicate the organic traces of the material and the presence of air pockets. It can be assumed that the refraction index of the TiO ₂ decreases because the refractive index of the acac (about 1.45) and the air pore (1) is lower than the refractive index of the pure anatase TiO ₂ (2.2 to 3.16). The deduction of 0.23 for the index of anatase TiO ₂ was found to be the best match between the extinction spectrum and the measured extinction spectrum calculated for all particle size sets. Considering the 5.5% porosity extracted from the BET measurement (see FIG. 20 and Table 1), assuming that the organic material is contained in the form of a small spherical insert in TiO ₂ , acac is reduced by about 14% through the Maxwell- . Although the constant subtraction of the index over all wavelengths did not take into account the dispersion characteristics of the material, the considered material was not strongly dispersed in the visible range. Since the calculated extinction shows good agreement with the measured spectrum obtained in other environments, the modified dielectric constant has shown to be robust in the wavelength range of interest to the inventors.

In order to evaluate the sensitivity of distinct colors to particle size and environment, the extinction behavior for a set of particles of different average size in a refractive index environment higher than air was investigated. 9A to 9D show Mie extinction probabilities calculated for each particle set with a background index and a constant of wavelength. Figures 9A to 9D respectively show particles of increasing size in order. It can be seen that for larger particles, the change in extinction for all indexes increases more. This is mainly due to the higher number of peaks resulting from the weighted contribution of the additional higher order scattering mode. Therefore, small changes in the background index may lead to some peak wavelength shifts, whereas in the case of small particles, the fluctuations are not noticeable because the extinction with a smaller number of peaks is relatively uncharacteristic. To confirm this behavior, particles dispersed in ethanol were prepared at a concentration of 0.75 mM for all particle size sets. Figures 10a-d show the extinction probability and the calculated extinction probability at four sets of particle sizes. An index of 1.36 was used to model the refractive index of ethanol. For all particle sets, we found a reasonable match between the measurements and calculations in this example and further validated the model's reliability and modified dielectric constant for the synthesized TiO ₂ . The inset of Figures 10a-10d depicts each solution located in front of the white LED light source, with each solution exhibiting a different color. Compared to the colors displayed on the glass slides of the set of dried particles (FIGS. 2A-2D), the larger set of particles underwent excessive conversion of color, while the smaller set of particles (average size, 351 nm) showed less distinct differences.

A highly sensitive scattering response to background indices for large size particles makes it possible to apply these particles as probes to determine the refractive index of various homogeneous media. In order to measure the sensitivity of the background index to each other quenching spectrum of TiO ₂ particles in the other medium was compared with the plasmon Au extinction spectra of nanoparticles and micron-sized SiO ₂ particles in the same medium (Fig. 11a to Fig. 11c and Fig. 12a-12c). Au nanoparticles were chosen because surface plasmon resonance is sensitive to the optical environment. 11A and 12A, the largest set of TiO ₂ particles having an average diameter of 1,082 nm was used to illustrate the perimeter diameter sensitivity, and Au nanoparticles of about 50 nm size, purchased commercially (nanoComposix) SiO ₂ particles were used for comparison in Figures 11b, 11c, 12b, and 12c, respectively. All solutions were prepared at a concentration of 1.25 mM. Water, ethanol, and dimethylformamide (DMF) were selected as the surrounding medium, wherein the average indices of the three solvents were 1.33, 1.36, and 1.43, respectively. It is noted that in this example each solvent is dispersive over the wavelength but that the refractive index change over a given wavelength range can be ignored for purposes of the present invention.

From the Mie quenching probability for the calculated TiO ₂ particles, quenching probability has been shown to be specific for all index values, thus allowing differentiation between different media. In contrast, Au nanoparticles exhibit strong peaks at 530 nm, exhibit plasmon absorption, and increase in intensity for large index values but are weakly dispersed over a given index range. SiO ₂ nanoparticles exhibited very weak contrast in quenching as a constant of the ambient index, which is evident by the monotonous spectrum seen in a given range. This is due to the low index contrast between SiO ₂ and the surrounding medium. Figures 12a-12c show measured extinction and calculated extinction for three solvents with each type of particle. In the case of the TiO ₂ particles, it was found that the positions of the extinguished peaks between the measurement and the calculation were consistent for each surrounding medium. In this example, it was noted that the index of water (1.33) and the index of ethanol (1.36) were only 0.03 different. This is due to a small change in the peak wavelength that is predicted by calculation and resolved by measurement. This corresponds to a 2.2% upper limit of the index sensitivity (n / n). Instead, in the case of Au nanoparticles, the peak shift was difficult to discern in the experiment, although a 530 nm plasmon peak was predicted to migrate to a higher wavelength for a larger peripheral index value. If the SiO ₂ particles, a monotonous decay of the extinction is measured at all of the medium, the distinction between the different media is tricky because the spectral features. This is more of a problem when the scattering agent is prepared at different concentrations because the absolute concentration may be different.

Optical visualization of extinction between different agents dispersed in the three surrounding media is more pronounced for differences in photosensitivity. 11A to 11C are each a pair of particles immersed in water, ethanol, and DMF, respectively, as optical images, in which each of the particles is immersed in indirect light (left) and (Right side) are shown. In the case of TiO ₂ particles, a clear distinction was made between water, ethanol, and DMF through the difference in color when viewed from the white LED light source. In other words, despite the low index contrast between water and ethanol, the two solvents showed red and orange colors that could be visually differentiated. However, in the case of Au nanoparticles, three kinds of solvents could not be distinguished by indirect light or direct light. All of the solutions showed a light red (or pink) due to plasmon absorption and small changes in wavelength were not readily detectable. In the case of SiO ₂ nanoparticles, the absence of peaks or valleys in the extinction spectrum causes colorless transparency. Therefore, efforts to visually distinguish the solvents were not successful.

To further demonstrate the optical sensitivity of particles of size 1,082 nm in solid and transparent media, the refractive index was extracted in this example by performing extinction measurements on the PDMS impregnated with the particles. The particles (2 mg) were dispersed in a curing agent (Sylgard 184, Dow Corning) and mixed at a ratio of 1:10 (w / w) with a silicone elastomer base (Sylgard 184, Dow Corning) . The dispersion in front of the white LED light source showed yellow-green as shown in Figs. 21 to 23. In order to model the measured extinction, the calculated fits are optimized in the wavelength range of 500 nm to 600 nm since all fixed index values are determined in this range. Through the above procedure, in the present embodiment, the PDMS matrix was obtained by obtaining an index of 1.41 + - 0.03, which is consistent with the reported range of 1.41 to 1.43.

Example  2: Cosmetic composition Color

In this embodiment, in order to determine the color change due to the TiO ₂ particles in accordance with the density of the medium, and followed by dispersion in a toner (Dr.Geo Inc.) purchased the TiO ₂ particles of each different particle size and concentration on the market.

The toner used in the present example was purified water, dipropylene glycol, glycerin, Centella asiatica extract, Peppermint extract, Ginseng leaf / stem extract, Drumstick leaf extract, Locust bark / leaf / twigs extract, / Leaf / stem extract, tapioca flavor, hydrolyzed corn starch, beet root extract, ceramide insert, golden extract, sodium hyaluronate, beta-glucan, ylang ylang flower oil, bergamot fruit oil, Sodium hyaluronate cross polymer-3, caprylic / capric triglyceride, phage-60 hydrogenated castor oil, octyldodecanol, hydrogenated lecithin, ammonium acrylate Roile dimethyltaurate / vpicopolymer, ethylhexyl glycerin, glyceryl caprylate, butylene glycol, disodium iodide, hydroxyacetate Benzophenone, and includes components such as xanthan gum.

The TiO ₂ particles of this example were prepared and used anatase phase TiO ₂ particles having an average diameter of 464 nm, 671 nm, 705 nm, 346 nm, 402 nm and 580 nm, respectively, and their SEM images : 1 mu m) are shown in Figs. 24A to 24F, respectively. In this embodiment, in order to confirm an example in which TiO ₂ nanoparticle scattering agent is implemented as a cosmetic composition, it is applied to a cosmetic toner actually used. Toner (manufactured by Dr. Geo Co.) was purchased in the market and mixed with TiO ₂ particles. First, to determine the TiO ₂ concentration, which represents the maximum intensity developed in the toner, two particles of the smallest size and the largest size were selected. An anatase phase TiO ₂ particle having an average diameter of 883 nm was prepared as a maximum particle used for A among the TiO ₂ particles of this example and its SEM image (scale bar: 10 μm) is shown in FIG. FIG. 26 shows the above-mentioned mixed solutions having different particle sizes and concentrations respectively observed before indirect light as described above. The TiO ₂ nanoparticle scattering agent (A in FIG. 26) having a size of about 883 nm and the TiO ₂ nanometer The extinction characteristics when the particle scattering agent (B in FIG. 26) was concentrated at different ratios of 0.2 M, 0.02 M and 0.002 M, respectively, were confirmed. Figs. 27A to 27C show the mixed solutions of Fig. 26 observed before direct light, wherein the two particles having the sizes of 883 nm and 402 nm had a refractive index of the particles of about 2.2 to about 3.16 under visible light, The teal was developed at about 883 ± 90 nm and the dark blue color was observed when the average size of the particles was about 402 ± 20 nm. As a result of the concentration of 0.2 M (FIG. 27A), 0.02 M (FIG. 27B) and 0.002 M (FIG. 27C), the concentration of 0.2 M is highly concentrated and thus the particles of TIO _{2 in} the solution are dispersed in multiple layers. Can not be done well. 0.02 M exhibited quenching characteristics compared to that, but the concentration was fixed at 0.002 M because the sharpest color was confirmed when diluted to 0.002 M,

Anatase phase TiO ₂ particles having an average diameter of 464 nm, 671 nm, 705 nm, 346 nm, 402 nm and 580 nm were dispersed in 0.002 M concentration in 5 mL of commercially available toner (manufactured by Dr. Geo Co.). TiO ₂ particles having average diameters of 464 nm, 671 nm, 705 nm, 346 nm, 402 nm, and 580 nm are sequentially mixed in the order from the left side of FIG. 28. In order to exhibit these extinctions, Respectively. The TiO ₂ particles had a refractive index of about 2.2 to about 3.16 under visible light. As shown in FIG. 28, dark blue was developed when the average size of the particles was about 464 ± 20 nm, and the average size Blue was developed when the average size of the particles was about 671 ± 20 nm and green when the average size of the particles was about 705 ± 50 nm and the average size of the particles was about 346 ± 20 nm Orange was developed when the average size of the particles was about 402 ± 20 nm and magenta was developed when the average size of the particles was about 580 ± 20 nm Respectively.

4. Conclusion

In summary, the present example demonstrated the generation of color through collective Mie scattering from the ensemble of dispersion of TiO ₂ particles close to the micron size. Unlike structures with subwavelength sizes where the use of a single resonant mode requires color control, strong scattering, and nanostructures of the same size for large size particles, the multiple resonant modes require a polydisperse size distribution, Combination. Since the number of scatter modes has increased, the larger the particle, the greater the number of weight-average extinction peaks in the visible range, so that the set can become more and more sensitive to the surrounding medium. Utilizing these properties, the present example demonstrated the ability of the TiO ₂ particles to act as an index sensor in a uniform medium with a better contrast sensitivity than the plasmon and dielectric nanoparticles. The ability of TiO ₂ particles to produce color through pure optical effects while maintaining their electronic and chemical properties raises interesting possibilities in colored transparent antimicrobial windows, thin film solar cells, and photocatalytic systems. Furthermore, the apparent optical sensitivity according to the different media provided by the polydispersed TiO ₂ particles facilitated the measurement of the index of the uniform medium through standard extinction measurements.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims (18)

A color-forming composition comprising a combination of a plurality of particles of different sizes dispersed in a medium,
The size distribution of the particles is polydispersity,
Wherein the color development of the color-forming composition is controlled by controlling at least one of a size of each of the particles, a size distribution of the particles, a dielectric constant of the particles, and a dielectric constant of the medium.
Coloring composition.
The method according to claim 1,
By controlling the extinction efficiency of the combination of the plurality of particles expressed by the Mie extinction cross section represented by the following equation (1) and the Mie extinction cross section of each of the particles, the color development of the coloring composition is controlled ≪ / RTI >
[Equation 1]

;
&Quot; (2) "

;
In the above equations,
C _ext and C _{poly, ext} are each independently a quenching probability for the grains of the grains and the polydispersity aggregates of the grains,
f is a size distribution of the particle,? is a wavelength, and s is a diameter of the particle.
The method according to claim 1,
Wherein the medium comprises air, a gas, or a solvent.
The method according to claim 1,
Wherein the plurality of particles of different sizes are in the range of 50 nm to 10 占 퐉.
The method according to claim 1,
Wherein the particles comprise a material having a band gap in the range of UV energy or less.
6. The method of claim 5,
Wherein the particles comprise a material selected from the group consisting of oxides, nitrides, carbides, oxynitrides, carbonitrides, and combinations thereof comprising one or more metal elements.
6. The method of claim 5,
The particles are TiO _2, ZnO, from BaTiO _3, diamond, SiC, BN, AlN, GaN , ZnS, CuCl, SnO 2, SrTiO 3, LiNbO 3, NiO, MgO, ZrO 2, and the group consisting of a combination of ≪ / RTI >
The method according to claim 1,
Wherein the average size of the particles is in the submicron to micron range.
The method according to claim 1,
Wherein the particles are spherical.
The method according to claim 1,
Wherein the particles contain an organic functional group.
The method according to claim 1,
Wherein the particles comprise TiO ₂ and under visible light each independently develops yellow when the average size of the particles is 351 ± 20 nm and when the average size of the particles is 518 ± 20 nm, navy blue) is developed, magenta is developed when the average size of the particles is 796 ± 50 nm, and teal is developed when the average size of the particles is 1,082 ± 100 nm. Composition.
The method according to claim 1,
Coloring composition for use in cosmetic compositions, antimicrobial windows, catalysts, photocatalysts, optical sensors, or photovoltaic devices.
The method according to claim 1,
Wherein said particles exhibit ultraviolet blocking and / or photocatalytic performance in addition to said color development.
14. A cosmetic composition comprising the color-developing composition according to any one of claims 1 to 13.
15. The method of claim 14,
The color developing composition is the group consisting of TiO _2, ZnO, BaTiO _3, diamond, SiC, BN, AlN, GaN , ZnS, CuCl, SnO 2, SrTiO 3, LiNbO 3, NiO, MgO, ZrO 2, and combinations thereof ≪ / RTI > wherein the particles comprise particles selected from the group consisting of particles.
16. The method of claim 15,
Wherein the average size of the particles is in the sub-micron to micron range.
16. The method of claim 15,
Wherein said particles exhibit color development and ultraviolet shielding performance.
14. A refractive index sensor comprising the color-developing composition according to any one of claims 1 to 13.

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