CN113621387B - Liquid crystal composite polarizing film and preparation method and application thereof - Google Patents
Liquid crystal composite polarizing film and preparation method and application thereof Download PDFInfo
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- CN113621387B CN113621387B CN202110919451.5A CN202110919451A CN113621387B CN 113621387 B CN113621387 B CN 113621387B CN 202110919451 A CN202110919451 A CN 202110919451A CN 113621387 B CN113621387 B CN 113621387B
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- G02B5/3016—Polarising elements involving passive liquid crystal elements
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- C09K2019/521—Inorganic solid particles
Abstract
The invention discloses a liquid crystal composite polarizing film and a preparation method and application thereof. The polarizing film includes: liquid crystal molecules and 0.8-1.2 nm inorganic nanowires, which are orderly arranged in the liquid crystal molecules, do not contain other additives. The polarizing film is prepared by uniformly mixing and orderly arranging the inorganic sub-nanowires and the liquid crystal molecules, does not contain other additives, has simple preparation process, time and labor saving, stable structure and performance, does not cause the reduction or loss of polarizing performance due to aging, is suitable for both ultraviolet light and visible light, and can be widely applied to polarizing devices as polarizing films.
Description
Technical Field
The invention belongs to the field of materials, and particularly relates to a liquid crystal composite polarizing film, and a preparation method and application thereof.
Background
Polarizing films are important optical devices and have important applications in the optical field. After a natural light beam passes through the polarizing film, the light intensity of the vibration direction along the polarizing axis direction of the polarizing film is stronger than the light intensity perpendicular to the polarizing axis direction. The polarizing films mainly used at present include iodine-based polarizing films, dyeing-based polarizing films, and wire grid polarizing films. The former two are polarizing films mainly based on polymer films, iodine molecules or organic dyes are adsorbed on the polymer films, and then extension orientation is carried out, so that the polarizing films have polarizing performance and complex process. In addition, under the action of light, moisture, external force and temperature change, the polymer film is aged, and the stretched polymer chains are restored to a curled state, at which the polarizing film loses its properties. Wire grid polarizer films are widely used for polarization of ultraviolet light and are typically fabricated by lithographic techniques such as ultraviolet interference lithography, nanoimprint lithography, block copolymer lithography, and the like. In addition, the wire grid period must be less than one third of the incident ultraviolet light, which is difficult to control; in addition, the wire grid polarizing film has high manufacturing cost and complicated process. Therefore, the preparation of the polarizing film with strong stability and simple process becomes a problem to be solved urgently.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a liquid crystal composite polarizing film, and a preparation method and application thereof. The polarizing film is prepared by uniformly mixing and orderly arranging the inorganic sub-nanowires and the liquid crystal molecules, does not contain other additives, has simple preparation process, time and labor saving, stable structure and performance, does not cause the reduction or loss of polarizing performance due to aging, is suitable for both ultraviolet light and visible light, and can be widely applied to polarizing devices as polarizing films.
The present application is mainly based on the following findings of the inventors: although the polarizing film can be prepared by utilizing the anisotropy and better flexibility of inorganic sub-nanowires, the polarizing film prepared by singly using the sub-nanowires such as gadolinium oxyhydroxide or the like or using the sub-nanowires such as gadolinium oxyhydroxide and the like in combination with quantum dots can only absorb ultraviolet light, and realizes the polarizing effect in an ultraviolet region, that is, the film absorbs visible light very weakly and cannot realize effective polarization of the visible light.
To this end, in one aspect of the present invention, a liquid crystal composite polarizing film is provided. According to an embodiment of the present invention, the polarizing film includes: liquid crystal molecules and 0.8-1.2 nm inorganic nanowires, which are orderly arranged in the liquid crystal molecules, do not contain other additives. Compared with the prior art, the polarizing film is prepared by uniformly mixing and orderly arranging the inorganic sub-nanowires and the liquid crystal molecules, and due to the regular and compact arrangement of the inorganic sub-nanowires along the axial direction and the characteristics of the liquid crystal molecules, the film has high anisotropy and birefringence, can polarize ultraviolet light and visible light simultaneously, and has high absorption rate to the visible light; in addition, the polarizing film has the following advantages: the polarizing film can be prepared by processes such as a film brushing method, does not contain other additives, has simple preparation process, time and labor conservation, stable structure and performance, does not cause the reduction or loss of polarizing performance due to aging, is suitable for both ultraviolet light and visible light, and can be widely applied to polarizing devices as the polarizing film.
In addition, the liquid crystal composite polarizing film according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the present invention, the content of the liquid crystal molecules in the polarizing film is 60 to 90wt%.
In some embodiments of the present invention, the liquid crystal molecules comprise at least one selected from the group consisting of cyanobiphenol, 4-heptyl-4 '-cyanobiphenyl, 4' -n-octyl-4-cyanobiphenyl, 4-cyano-4 '-pentylbiphenyl, 4-pentyloxy-4' -cyanobiphenyl, and p-cyanooctyloxy biphenyl.
In some embodiments of the present invention, the inorganic sub-nanowire comprises at least one selected from the group consisting of a gadolinium oxyhydroxide sub-nanowire, a nickel molybdate sub-nanowire, a hydroxyapatite sub-nanowire, a tungsten oxide sub-nanowire, a vanadium phosphate sub-nanowire, and a polyacid sub-nanowire comprising at least one selected from the group consisting of iron phosphomolybdate, zirconium phosphomolybdate, titanium phosphomolybdate, cerium phosphomolybdate, ytterbium phosphomolybdate, yttrium phosphomolybdate, manganese phosphomolybdate, cobalt phosphomolybdate, nickel phosphomolybdate, iron silicomolybdate, bismuth phosphomolybdate, calcium phosphotungstate, and strontium phosphotungstate sub-nanowire.
In some embodiments of the invention, the inorganic nanowires are inorganic nanowires with surface ligands.
In some embodiments of the invention, the surface ligand comprises at least one selected from oleylamine, oleic acid, n-octylamine, octadecylamine, oleyl alcohol.
In some embodiments of the present invention, the thickness of the polarizing film is 50 to 1000nm, preferably 400 to 600nm.
In some embodiments of the present invention, the polarizing film is prepared by a brush coating method.
In still another aspect of the present invention, the present invention provides a method for preparing the above liquid crystal composite polarizing film. According to an embodiment of the invention, the method comprises: (1) Dispersing the inorganic sub-nanowire with the surface ligand in a small molecular organic solvent so as to obtain an inorganic sub-nanowire dispersion liquid; (2) Mixing the inorganic sub-nanowire dispersion liquid with liquid crystal molecules so as to obtain a membrane preparation stock solution; (3) And brushing the film preparation stock solution on a quartz glass substrate by using an automatic film brushing instrument so as to obtain the liquid crystal composite polarizing film. Compared with the prior art, the method is simple in process, time-saving and labor-saving, the prepared polarizing film is stable in structure and performance, the polarizing performance cannot be reduced or lost due to aging, the method is suitable for both ultraviolet light and visible light, and the polarizing film can be widely applied to polarizing devices as a polarizing film.
In some embodiments of the present invention, in the step (1), the inorganic sub-nanowires having surface ligands are prepared using at least one selected from the group consisting of oleylamine, oleic acid, n-octylamine, octadecylamine, oleyl alcohol as a surfactant; and/or the small molecular organic solvent is at least one selected from octane, cyclohexane, normal hexane, toluene and chloroform.
In another aspect of the present invention, a polarizing device is provided. According to an embodiment of the present invention, the polarizing device has the above liquid crystal composite polarizing film. Compared with the prior art, this polarisation device's polarisation performance is more stable, can not lead to the polarisation performance to reduce or lose because of effects such as illumination, humidity, external force and temperature variation, can show the life who prolongs polarisation device, promotes user experience.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flowchart of a method for manufacturing a liquid crystal composite polarizing film according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In one aspect of the invention, a liquid crystal composite polarizing film is provided. According to an embodiment of the present invention, the polarizing film includes: liquid crystal molecules and 0.8-1.2 nm inorganic nanowires, and no other additives, wherein the inorganic nanowires are orderly arranged in the liquid crystal molecules. Compared with the prior art, the polarizing film is prepared by uniformly mixing and orderly arranging the inorganic sub-nanowires and the liquid crystal molecules, and due to the regular and compact arrangement of the inorganic sub-nanowires along the axial direction and the characteristics of the liquid crystal molecules, the film has high anisotropy and birefringence, can polarize ultraviolet light and visible light simultaneously, and has high absorption rate to the visible light; in addition, the polarizing film has the following advantages: the polarizing film can be prepared by processes such as a film brushing method, does not contain other additives, has simple preparation process, time and labor conservation, stable structure and performance, does not cause the reduction or loss of polarizing performance due to aging, is suitable for both ultraviolet light and visible light, and can be widely applied to polarizing devices as the polarizing film.
The liquid crystal composite polarizing film according to the above embodiment of the present invention will be described in detail.
According to some embodiments of the present invention, the content of the liquid crystal molecules in the polarizing film may be 60 to 90wt%, for example, 60wt%, 63wt%, 66wt%, 69wt%, 72wt%, 75wt%, 78wt%, 81wt%, 84wt%, 87wt%, or 90wt%, and the inventors found that the film can only achieve polarization absorption of ultraviolet light by using the inorganic sub-nanowires as the film, and can achieve polarization absorption of ultraviolet light and visible light at the same time after adding the liquid crystal molecules, but the liquid crystal molecules are not volatile, and if the content of the liquid crystal molecules is too large, the film-forming solution obtained by mixing the inorganic sub-nanowires and the liquid crystal molecules is difficult to form a film, and even if the film can be formed, the film is easily broken, and if the content of the liquid crystal molecules is too small, the polarization absorption effect in the visible light region is poor.
According to still other embodiments of the present invention, the kind of the liquid crystal molecules in the present invention is not particularly limited, and may be selected by those skilled in the art according to actual needs, for example, the liquid crystal molecules may include at least one selected from the group consisting of cyanobiphenol, 4-heptyl-4 '-cyanobiphenyl, 4' -n-octyl-4-cyanobiphenyl, 4-cyano-4 '-pentylbiphenyl, 4-pentyloxy-4' -cyanobiphenyl, and p-cyanooctyloxy biphenyl, and the inventors have found that the use of the above-mentioned kind of liquid crystal molecules can ensure a good polarization absorption effect of the polarizing film in the visible light region.
According to still other embodiments of the present invention, the kind of the inorganic sub-nanowire in the present invention is not particularly limited, and can be selected by those skilled in the art according to actual needs. For example, the inorganic sub-nanowire may include at least one selected from the group consisting of gadolinium oxyhydroxide sub-nanowire, nickel molybdate sub-nanowire, hydroxyapatite sub-nanowire, tungsten oxide sub-nanowire, vanadium phosphate sub-nanowire, and polyacid sub-nanowire, wherein the polyacid sub-nanowire may further include at least one selected from the group consisting of iron phosphomolybdate, zirconium phosphomolybdate, titanium phosphomolybdate, cerium phosphomolybdate, ytterbium phosphomolybdate, yttrium phosphomolybdate, manganese phosphomolybdate, cobalt phosphomolybdate, nickel phosphomolybdate, ferric silicotungstate, bismuth phosphomolybdate, calcium phosphotungstate, and strontium phosphotungstate sub-nanowire, and the use of the above kind of inorganic sub-nanowire in the present invention may ensure a good polarization absorption effect of the polarizing film in the ultraviolet region.
According to still other embodiments of the present invention, the inorganic sub-nanowire may be an inorganic sub-nanowire having a surface ligand, wherein the surface ligand used may be at least one selected from oleylamine, oleic acid, n-octylamine, octadecylamine, and oleyl alcohol, and the inventors have found that by using oleylamine, oleic acid, and the like as the surface ligand of the inorganic sub-nanowire, the dispersibility of the inorganic sub-nanowire in liquid crystal molecules may be significantly improved, and the agglomeration thereof in the liquid crystal molecules may be avoided, so that the uniformity of the polarizing film may be significantly improved, and thus the polarization absorption effect of the polarizing film in the visible region — ultraviolet region may be further improved.
According to still further embodiments of the present invention, the thickness of the polarizing film may be 50 to 1000nm, for example, 100nm, 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm, 850nm, 900nm, 950nm, etc., and preferably, may be 400 to 600nm. The inventor finds that if the thickness of the polarizing film is too small, not only the preparation difficulty is large, but also the polarizing effect is poor, and the film is also poor in strength and fragile; if the thickness of the polarizing film is too large, the light transmittance of the polarizing film is affected, and even if the incident light intensity is large, the light transmittance is low.
According to still other embodiments of the present invention, the polarizing film may be prepared by a brushing method, specifically, the inorganic sub-nanowires may be dispersed in liquid crystal molecules to obtain a film-making stock solution, and the film-making stock solution is brushed on a substrate such as quartz glass by using an automatic brushing apparatus, so as to obtain the liquid crystal composite polarizing film.
In still another aspect of the present invention, the present invention provides a method for preparing the above liquid crystal composite polarizing film. According to an embodiment of the invention, as understood with reference to fig. 1, the method comprises: (1) Dispersing the inorganic sub-nanowire with the surface ligand in a small molecular organic solvent so as to obtain an inorganic sub-nanowire dispersion liquid; (2) Mixing the inorganic sub-nanowire dispersion liquid with liquid crystal molecules so as to obtain a membrane preparation stock solution; (3) And brushing the film-making stock solution on a quartz glass substrate by using an automatic film brushing instrument so as to obtain the liquid crystal composite polarizing film. Compared with the prior art, the method is simple in process, time-saving and labor-saving, the prepared polarizing film is stable in structure and performance, the polarizing performance cannot be reduced or lost due to aging, the method is suitable for both ultraviolet light and visible light, and the polarizing film can be widely applied to polarizing devices as a polarizing film.
According to some embodiments of the present invention, an inorganic nanowire having a surface ligand may be prepared using at least one surfactant selected from oleylamine, oleic acid, n-octylamine, octadecylamine, and oleyl alcohol, and the inventors have found that the dispersibility of the inorganic nanowire in a small molecular solvent and a film-forming stock solution may be improved by forming the ligand on the surface of the inorganic nanowire, and thus the uniformity of the prepared polarizing film may be further improved to have more stable polarizing performance. Further, the small-molecular organic solvent may be at least one selected from the group consisting of octane, cyclohexane, n-hexane, toluene and chloroform, and the inventors have found that the inorganic nanowires may swell in the small-molecular organic solvents to form a uniform dispersion liquid having a certain viscosity, and further, when the dispersion liquid is mixed with liquid crystal molecules, the uniformity of a film-forming stock solution may be further improved, thereby ensuring that the finally obtained polarizing film has a stable polarizing effect.
According to still other embodiments of the present invention, the inorganic nanowires with surface ligands can be prepared by a room temperature reaction method or a solvothermal reaction method. Specifically, when a room temperature reaction is adopted, the inorganic salt reaction raw material for forming the inorganic nanowires may be dissolved in water, and a ligand is added, and the reaction is performed with continuous stirring at room temperature, and after the reaction is completed, the obtained reaction solution is washed and centrifuged using a non-polar solvent and/or a weakly polar solvent and a polar solvent, so as to obtain the inorganic nanowires. When the solvothermal method is adopted, inorganic salt reaction raw materials for forming the inorganic sub-nanowires can be dissolved in water, the ligand is added, the mixed solution is placed in a high-pressure reaction kettle after being uniformly stirred for solvothermal reaction, and after the reaction is finished, the obtained reaction solution is washed and centrifuged by a non-polar solvent and/or a weak-polar solvent and a polar solvent, so that the inorganic sub-nanowires are obtained. Further, regardless of the room temperature reaction method or the solvothermal reaction method, before the reaction, the ligand can be added and the small molecular organic solvent can be added, so that the inorganic nanowires obtained by the reaction can be more favorably and uniformly dispersed in the reaction solution. In addition, it is preferable that the polarity of the low-polarity solvent is not higher than that of chloroform, and the polarity of the polar solvent is not lower than that of ethanol, and the kinds of the polar solvent and the nonpolar solvent/low-polarity solvent used in washing the obtained reaction solution under the precondition are not particularly limited, and those skilled in the art may select them according to actual needs, for example, the polar solvent may be ethanol and/or acetone, and the nonpolar solvent may be at least one selected from cyclohexane, n-octane, n-hexane, toluene, and chloroform.
It should be noted that the features and effects described for the liquid crystal composite polarizing film are also applicable to the method for preparing the liquid crystal composite polarizing film, and are not described in detail herein.
In another aspect of the present invention, a polarizing device is provided. According to an embodiment of the present invention, the polarizing device has the above-described liquid crystal composite polarizing film. Compared with the prior art, the polarizing device has more stable polarizing performance, can not reduce or lose the polarizing performance due to the effects of illumination, humidity, external force, temperature change and the like, can obviously prolong the service life of the polarizing device, and improves the user experience. It should be noted that the type of the polarizing device in the present invention is not particularly limited, and those skilled in the art can select the polarizing device according to actual needs, for example, the polarizing device may be a liquid crystal display, a polarizing lens, a polarizer in an ultraviolet-visible light region, or a device for providing anisotropic scattered light. In addition, it should be noted that the features and effects described for the liquid crystal composite polarizing film and the method for preparing the liquid crystal composite polarizing film are also applicable to the polarizing device, and are not repeated herein.
The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
1) Synthesis of bismuth phosphomolybdate sub-nanowires by room temperature reaction
0.8g of phosphomolybdic acid and 0.2g of bismuth nitrate were weighed into a 40mL reaction vessel, and 16mL of deionized water was added and stirred for 10 minutes. Then 10mL of octadecene and 6mL of oleylamine were added and stirred for 10 minutes. Subsequently, the reaction kettle is sealed and placed in an oven at 180 ℃ for reaction for 8 hours and then naturally cooled to room temperature. And pouring the product in the reaction kettle into a centrifuge tube, adding n-octane and ethanol, and centrifuging and washing for three times.
2) Preparation of a Mixed solution of sub-nanowires and liquid Crystal molecules
The nanowires were dispersed in chloroform to prepare 10mL of a dispersion with a concentration of 40mg/mL, and 2mL of 4-cyano-4' -pentylbiphenyl was added, stirred for 10 minutes, and mixed uniformly.
3) Preparation of sub-nanowire-liquid crystal composite polarizing film
1mL of membrane preparation stock solution is dripped on a quartz glass substrate, the position of a brush head of an automatic membrane brushing instrument is adjusted to be 0.4mm away from the substrate, the moving speed of the brush head is 0.2mm/s, after membrane brushing is finished, the quartz glass substrate is placed at 60 ℃ to volatilize chloroform, and then the quartz glass substrate is cooled to room temperature. Wherein, the content of the liquid crystal molecules in the prepared polarizing film is 83 weight percent, and the thickness is 500nm.
Comparative example 1
The difference from example 1 is that:
in the step 2), 4mL of 4-cyano-4' -pentylbiphenyl was added;
in the step 3), the content of liquid crystal molecules in the prepared polarizing film is 91wt%, and the thickness is 300nm.
Comparative example 2
The difference from example 1 is that:
in the step 2), 0.5mL of 4-cyano-4' -pentylbiphenyl was added;
in the step 3), the content of liquid crystal molecules in the prepared polarizing film is 55wt%, and the thickness is 600nm.
Comparative example 3
The difference from example 1 is that:
in the step 3), the distance between the brush head and the substrate is 1mm, and the thickness is 1100nm.
The properties of the polarizing films obtained in example 1 and comparative examples 1 to 3 were evaluated:
the polarizing film of the embodiment 1 has the polarization degree of 90 percent and the transmittance of 48 percent; the polarizing film of the comparative example 1 has the polarization degree of 90 percent and the transmittance of 48 percent; the polarizing film of the comparative example 2 has 50% of polarization degree and 70% of transmittance; the polarizing film of comparative example 3 has a polarization degree of 90% and a transmittance of 25%.
It should be noted that, although the polarization degree and the light transmittance of example 1 are consistent with those of comparative example 1, the film formation difficulty of the polarizing film in comparative example 1 is large, and the film is fragile.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A liquid crystal composite polarizing film, comprising: liquid crystal molecules and 0.8 to 1.2nm inorganic sub-nanowires, wherein the inorganic sub-nanowires are orderly arranged in the liquid crystal molecules and do not contain other additives, and the liquid crystal molecules are as follows:
the content of liquid crystal molecules in the polarizing film is 60-90wt%;
the inorganic sub-nanowire comprises at least one selected from the group consisting of a gadolinium oxyhydroxide sub-nanowire, a nickel molybdate sub-nanowire, a hydroxyapatite sub-nanowire, a tungsten oxide sub-nanowire, a vanadium phosphate sub-nanowire, and a polyacid sub-nanowire comprising at least one selected from the group consisting of an iron phosphomolybdate, a zirconium phosphomolybdate, a titanium phosphomolybdate, a cerium phosphomolybdate, an ytterbium phosphomolybdate, an yttrium phosphomolybdate, a manganese phosphomolybdate, a cobalt phosphomolybdate, a nickel phosphomolybdate, an iron silicotungstate, a bismuth phosphomolybdate, a calcium phosphotungstate, and a strontium phosphotungstate sub-nanowire;
the inorganic sub-nanowire is an inorganic sub-nanowire with a surface ligand.
2. The liquid crystal composite polarizing film according to claim 1, wherein the liquid crystal molecules comprise at least one selected from the group consisting of cyanobiphenol, 4-heptyl-4 '-cyanobiphenyl, 4' -n-octyl-4-cyanobiphenyl, 4-cyano-4 '-pentylbiphenyl, 4-pentyloxy-4' -cyanobiphenyl, and p-cyanooctyloxy biphenyl.
3. The liquid crystal composite polarizing film according to claim 1, wherein the surface ligand comprises at least one selected from the group consisting of oleylamine, oleic acid, n-octylamine, octadecylamine, and oleyl alcohol.
4. The liquid crystal composite polarizing film according to claim 1, wherein the thickness of the polarizing film is 50 to 1000nm.
5. The liquid crystal composite polarizing film according to claim 1, wherein the thickness of the polarizing film is 400 to 600nm.
6. The liquid crystal composite polarizing film according to claim 1, wherein the polarizing film is produced by a brush coating method.
7. A method of making the liquid crystal composite polarizing film of any one of claims 1~6 comprising:
(1) Dispersing the inorganic sub-nanowire with the surface ligand in a small molecular organic solvent so as to obtain an inorganic sub-nanowire dispersion liquid;
(2) Mixing the inorganic sub-nanowire dispersion liquid with liquid crystal molecules so as to obtain a membrane preparation stock solution;
(3) And brushing the film preparation stock solution on a quartz glass substrate by using an automatic film brushing instrument so as to obtain the liquid crystal composite polarizing film.
8. The method as claimed in claim 7, wherein in the step (1), the inorganic sub-nanowires having surface ligands are prepared using at least one selected from the group consisting of oleylamine, oleic acid, n-octylamine, octadecylamine, oleyl alcohol as a surfactant; and/or the small molecular organic solvent is at least one selected from octane, cyclohexane, normal hexane, toluene and chloroform.
9. A polarizing device comprising the liquid crystal composite polarizing film according to any one of claims 1 to 6.
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