CN102495494A - Method for regulating and controlling liquid crystal reflected color by using reversibility of azobenzene - Google Patents
Method for regulating and controlling liquid crystal reflected color by using reversibility of azobenzene Download PDFInfo
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- CN102495494A CN102495494A CN2011104020439A CN201110402043A CN102495494A CN 102495494 A CN102495494 A CN 102495494A CN 2011104020439 A CN2011104020439 A CN 2011104020439A CN 201110402043 A CN201110402043 A CN 201110402043A CN 102495494 A CN102495494 A CN 102495494A
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Abstract
The invention relates to a method for regulating and controlling a liquid crystal reflected color by using the reversibility of azobenzene, and belongs to the field of application of photosensitive materials and liquid crystal materials. A matrix material consists of liquid crystal molecules, chiral molecules and photoresponse azobenzene molecules. According to the method, the liquid crystal molecules, the chiral molecules and the photoresponse azobenzene molecules are uniformly mixed in a certain proportion, and then are poured into a liquid crystal box; and the cis-trans isomerization of the azobenzene molecules in the system is regulated and controlled, so that change of the orientation and change of a reflected color of a liquid crystal composite can be controlled by a light field. The method has the advantages that: the cis-trans isomerization of the azobenzene is induced by illumination, so the change of the reflected color of the system can be reversibly regulated and controlled by the light field; and therefore, the liquid crystal material can be well applied to the fields, such as light storage, light display, light switch and the like.
Description
Technical field
The invention belongs to photochromics and liquid crystal material field, a kind of method of using the reversible regulation and control liquid crystal of azobenzene reflection colour is provided.
Background technology
The azobenzene compound is owing to have UV-irradiation and carry out transly carrying out cis to cis-structure isomerization and radiation of visible light and recovering the special nature of reacting to the transconfiguration isomerization, and becomes a kind of light-operated material well.When photic isomery took place azobenzene molecule, its molecular shape also changed thereupon.When azobenzene molecule is in transconfiguration, be shaped as club shaped structure; When azobenzene molecule is in cis-structure, be shaped as warp architecture.With the azobenzene the light-operated material on basis now, in optical storage, photoswitch, there has been a large amount of fundamental researchs aspects such as light demonstration, for azobenzene is providing wide application prospect aspect the light-operated material.
Liquid crystal had both had the isotropy of liquid, had the order of crystal again, and it is the material that is not had the symmetric molecular partial order of ball by rodlike molecule, dish type molecule etc.Liquid crystal not only has the flow characteristics of fluid, and can demonstrate the intrinsic space anisotropy of crystal, comprises the space anisotropy of dielectric, magnetic polarization, optical refractive index etc.Just because of having these special performances, make liquid crystal in optical storage, light shows that fields such as photoswitch are widely used.
The molecules align of liquid crystal and unlike the such three-dimensional order of crystal structure; It is a kind of long-range orderly arrangement; This arrangement mode make liquid crystal molecule receive power such as electric field, magnetic field, temperature, intermolecular force do arrange again the time spent than being easier to, thereby change the various optical characteristics of liquid crystal.
Through azobenzene molecule is joined in the liquid crystal material; Because the azobenzene molecule cis-structure is bar-shaped; Trans is bending; The conversion of these two kinds of structures is equivalent to liquid crystal molecule has been applied an external force, thereby is easy to realize the regulation and control to Liquid Crystal Molecules Alignment, for example reversible transition between nematic phase or cholesteric phase and the isotropic phase etc.Because the pitch wavelength catoptrical with it of cholesteric liquid crystal is suitable, therefore can utilizes the azobenzene cis-trans isomerism to regulate and control the pitch of cholesteric liquid crystal, and then can realize regulation and control, and then show as and reflect various colors the reflection wavelength of cholesteric liquid crystal.Therefore it is significant aspect optical applications to study azobenzene-liquid crystal mixed system, can realize it at photoswitch, optical storage, and light shows, light-operated coating, the application of aspects such as optical shutter.
Summary of the invention
The object of the present invention is to provide a kind of method of using the reversible regulation and control liquid crystal of azobenzene reflection colour.
A kind of method of using the reversible regulation and control liquid crystal of azobenzene reflection colour; It is characterized in that: in the main body liquid crystal, add object azobenzene and chiral molecules; Object azobenzene and chiral molecules account for the potpourri gross mass less than 10%; Under the prerequisite of not destroying the liquid crystal optics characteristic, reach the purpose of utilizing the reversible variation of photocontrol system reflection colour; With liquid crystal molecule, after chiral molecules and azobenzene molecule mix according to a certain percentage, pour among the liquid crystal cell; During original state, azobenzene is a transconfiguration; When using the UV-irradiation mixed system, azobenzene becomes cis-structure; When re-using the radiation of visible light mixed system, azobenzene becomes transconfiguration again; In the illumination process, reversible variation takes place with the photic isomery of azobenzene molecule in the orientation of liquid crystal molecule and the reflection wavelength of system.
Use ultraviolet light and visible light can realize the reversible variation of the phase of mixed system.
Use ultraviolet light and visible light can realize the reversible variation of mixed system reflection colour.
Liquid crystal molecule, the mass percent of chiral molecules and azobenzene molecule is respectively: chiral molecules and azobenzene molecule respectively account for 2%-9%, surplus is a liquid-crystal compounds; Azobenzene molecule be can photic isomery azobenzene compound, chipal compounds is the derivant like dinaphthalene diphenol and dinaphthalene diphenol, the isobide derivant, sweet mellow wine, cholesterol etc., liquid-crystal compounds are 8CB, 5CB, E7, K15 etc.
The invention has the advantages that simply photochromics-azobenzene is sneaked in the liquid crystal, utilize the photic isomery characteristic of azobenzene that the liquid crystal reflection colour is carried out reversible regulation and control.With respect to traditional electric field, magnetic field and temperature adjusting, utilize light to regulate and control efficient energy-saving more, can make liquid crystal material in optical storage, light shows that fields such as photoswitch obtain better application.
Description of drawings
Fig. 1 a, 1b, 1c are respectively azobenzene, and dinaphthalene two amphyls are with the molecular formula of 8CB.
Fig. 2 is the photic isomery characteristic of an azobenzene process.
Fig. 3 a is the POM image that the mixed system in the instance 1 does not pass through ultraviolet lighting.
Fig. 3 b is the POM image of mixed system behind ultraviolet lighting 30s in the instance 1.
Fig. 3 c is the POM image of mixed system behind ultraviolet lighting 120s in the instance 1.
Fig. 3 d is the POM image of mixed system after visible light shines 3h in the instance 1.
Fig. 4 is the variation of the uv-visible absorption spectra of the mixed system in the instance 1 with ultraviolet-visible illumination.
Fig. 5 is the variation of the transmitance of the mixed system in the instance 2 with ultraviolet lighting.
Embodiment
Instance 1
With azobenzene, dinaphthalene two amphyls mix according to mass ratio 3%:3%:94% with 8CB, pour in the parallel-oriented liquid crystal cell, under 20.0 ℃ room temperature condition, use wavelength to be 365nm, and light intensity is 10.0mW/cm
2The UV-irradiation liquid crystal cell.
Under polarizing microscope, observe the variation that liquid crystal texture is taken place with ultraviolet-visible illumination: 1. before the ultraviolet lighting, the texture of mixed system is that (Fig. 3 a), this moment, the penetrability of liquid crystal cell was lower for the fan-shaped texture of smectic phase; 2. use wavelength to be 365nm, light intensity is 10.0mW/cm
2 Ultraviolet lighting 30s after; Azobenzene generation cis-trans isomerism (Fig. 2) with photic isomery characteristic; Receive that azobenzene molecule is isomerized to be influenced; Mixed system is converted into the lower cholesteric phase of the degree of order by the higher smectic phase of the degree of order, and its texture also becomes the planar texture (Fig. 3 b) of cholesteric phase, and this moment, the penetrability of liquid crystal cell was very high; 3. use wavelength to be 365nm, light intensity is 10.0mW/cm
2 Ultraviolet lighting 120s after, mixed system loses liquid crystal phase, becomes isotropy (Fig. 3 c); 4. irradiation is after 3 hours under natural light, and mixed system recovers initial smectic phase (Fig. 3 d).Variation (Fig. 4) with the uv-visible absorption spectra of the corresponding time point of ultraviolet-visible spectrophotometer test mixing system.
Instance 2
With azobenzene, dinaphthalene two amphyls mix according to mass ratio 3%:5%:92% with 8CB, pour in the parallel-oriented liquid crystal cell, under 14.3 ℃ room temperature condition, use wavelength to be 365nm, and light intensity is 10.0mW/cm
2The UV-irradiation liquid crystal cell, use its optical transmission spectra of ultraviolet-visible spectrophotometer test to change (Fig. 5) with ultraviolet lighting.And, liquid crystal cell is placed under the black floor, observe the variation of system reflection colour.
Test result shows that ultraviolet lighting is after 10 seconds, and the peak that sees through of mixed system is blue shifted to about 520nm from about 640nm; Continue illumination to 90s, see through the peak and disappear, explain that the photic isomery of a small amount of azobenzene reduces the liquid crystal molecule spacing of its both sides, thereby changed the pitch of cholesteric liquid crystal; When the azobenzene that photic isomery takes place reaches some, the order of liquid crystal molecule is destroyed fully, is converted into isotropic phase.
Along with the UV-irradiation time lengthening, liquid crystal cell reflects various colors, and under radiation of visible light, returns to original state again.Liquid crystal cell reflects orangely when initial, and along with the prolongation of ultraviolet lighting time, liquid crystal cell reflects green, continues illumination liquid crystal cell bleach.Explain that ultraviolet lighting causes the photic isomery of azobenzene, and then the pitch of cholesteric liquid crystal is reduced, the reflection wavelength blue shift; Continue illumination again, when the azobenzene that photic isomery takes place reaches some, the order of liquid crystal molecule is destroyed fully, is converted into isotropic phase, so reflection colour not is clear state.
Claims (4)
1. method of using the reversible regulation and control liquid crystal of azobenzene reflection colour; It is characterized in that: in the main body liquid crystal, add object azobenzene and chiral molecules; Object azobenzene and chiral molecules account for the potpourri gross mass less than 10%; Under the prerequisite of not destroying the liquid crystal optics characteristic, reach the purpose of utilizing the reversible variation of photocontrol system reflection colour; With liquid crystal molecule, after chiral molecules and azobenzene molecule mix according to a certain percentage, pour among the liquid crystal cell; During original state, azobenzene is a transconfiguration; When using the UV-irradiation mixed system, azobenzene becomes cis-structure; When re-using the radiation of visible light mixed system, azobenzene becomes transconfiguration again; In the illumination process, reversible variation takes place with the photic isomery of azobenzene molecule in the orientation of liquid crystal molecule and the reflection wavelength of system.
2. according to the method for the reversible regulation and control liquid crystal of the described use azobenzene of claim 1 reflection colour, it is characterized in that: use ultraviolet light and visible light can realize the reversible variation of the phase of mixed system.
3. according to the method for the reversible regulation and control liquid crystal of the described use azobenzene of claim 1 reflection colour, it is characterized in that: use ultraviolet light and visible light can realize the reversible variation of mixed system reflection colour.
4. according to the method for the reversible regulation and control liquid crystal of the described use azobenzene of claim 1 reflection colour; It is characterized in that: liquid crystal molecule, the mass percent of chiral molecules and azobenzene molecule is respectively: chiral molecules and azobenzene molecule respectively account for 2%-9%, surplus is a liquid-crystal compounds; Azobenzene molecule be can photic isomery azobenzene compound, chipal compounds is derivant, isobide derivant, sweet mellow wine or the cholesterol of dinaphthalene diphenol or dinaphthalene diphenol, liquid-crystal compounds is 8CB, 5CB, E7 or K15.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103631030A (en) * | 2012-08-27 | 2014-03-12 | 庄臣及庄臣视力保护公司 | Usage compliance indicator for contact lenses |
| CN104496933A (en) * | 2014-11-20 | 2015-04-08 | 合肥工业大学 | Photosensitive chiral macrocyclic molecule and preparation method and application thereof |
| CN104570494A (en) * | 2015-01-27 | 2015-04-29 | 京东方科技集团股份有限公司 | Liquid crystal panel, display device and manufacturing method for liquid crystal panel |
| CN104142587B (en) * | 2014-07-16 | 2017-07-04 | 北京大学 | Bireflectance band cholesteric liquid crystal with reversible response characteristics to light and preparation method thereof |
| CN109097068A (en) * | 2018-07-24 | 2018-12-28 | 京东方科技集团股份有限公司 | Liquid crystal compound, broadband light reflection device and its application method |
| CN109868140A (en) * | 2017-12-01 | 2019-06-11 | 复旦大学 | A method of replace azobenzene to regulate and control liquid crystal reflection color using fluorine |
| WO2019105491A3 (en) * | 2017-12-01 | 2019-07-25 | 复旦大学 | Method for using fluorinated azobenzene to regulate liquid crystal reflection colour |
| CN110389462A (en) * | 2018-04-16 | 2019-10-29 | 通用汽车环球科技运作有限责任公司 | Photochromic films |
| CN112596317A (en) * | 2020-12-16 | 2021-04-02 | 北京大学 | Preparation method and application of intelligent liquid crystal color changing device with ultraviolet light drive |
| CN115806826A (en) * | 2021-09-14 | 2023-03-17 | 中国科学院理化技术研究所 | Cholesteric liquid crystal capable of realizing multi-wavelength light tuning guidance, and preparation and application thereof |
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Non-Patent Citations (1)
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| TWI622830B (en) * | 2012-08-27 | 2018-05-01 | 壯生和壯生視覺關懷公司 | Usage compliance indicator for contact lenses |
| CN103631030A (en) * | 2012-08-27 | 2014-03-12 | 庄臣及庄臣视力保护公司 | Usage compliance indicator for contact lenses |
| CN104142587B (en) * | 2014-07-16 | 2017-07-04 | 北京大学 | Bireflectance band cholesteric liquid crystal with reversible response characteristics to light and preparation method thereof |
| CN104496933A (en) * | 2014-11-20 | 2015-04-08 | 合肥工业大学 | Photosensitive chiral macrocyclic molecule and preparation method and application thereof |
| CN104570494A (en) * | 2015-01-27 | 2015-04-29 | 京东方科技集团股份有限公司 | Liquid crystal panel, display device and manufacturing method for liquid crystal panel |
| US9880422B2 (en) | 2015-01-27 | 2018-01-30 | Boe Technology Group Co., Ltd. | Liquid crystal panel, display apparatus and method for manufacturing the liquid crystal panel |
| WO2019105491A3 (en) * | 2017-12-01 | 2019-07-25 | 复旦大学 | Method for using fluorinated azobenzene to regulate liquid crystal reflection colour |
| CN109868140A (en) * | 2017-12-01 | 2019-06-11 | 复旦大学 | A method of replace azobenzene to regulate and control liquid crystal reflection color using fluorine |
| CN110389462A (en) * | 2018-04-16 | 2019-10-29 | 通用汽车环球科技运作有限责任公司 | Photochromic films |
| CN109097068A (en) * | 2018-07-24 | 2018-12-28 | 京东方科技集团股份有限公司 | Liquid crystal compound, broadband light reflection device and its application method |
| CN112596317A (en) * | 2020-12-16 | 2021-04-02 | 北京大学 | Preparation method and application of intelligent liquid crystal color changing device with ultraviolet light drive |
| CN112596317B (en) * | 2020-12-16 | 2022-03-29 | 北京大学 | Preparation method and application of intelligent liquid crystal color changing device with ultraviolet light drive |
| CN115806826A (en) * | 2021-09-14 | 2023-03-17 | 中国科学院理化技术研究所 | Cholesteric liquid crystal capable of realizing multi-wavelength light tuning guidance, and preparation and application thereof |
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Application publication date: 20120613 |