CN110568689B - Method for regulating orientation of liquid crystal element in colloidal liquid crystal - Google Patents
Method for regulating orientation of liquid crystal element in colloidal liquid crystal Download PDFInfo
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- CN110568689B CN110568689B CN201910837175.0A CN201910837175A CN110568689B CN 110568689 B CN110568689 B CN 110568689B CN 201910837175 A CN201910837175 A CN 201910837175A CN 110568689 B CN110568689 B CN 110568689B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
- C09K19/3819—Polysaccharides or derivatives thereof
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
Abstract
The invention discloses a method for regulating and controlling the orientation of liquid crystal elements in colloidal liquid crystal, which belongs to the field of liquid crystal. The invention can prepare the colloidal liquid crystal with the micron-scale orientation microstructure by adopting the micron-scale probe and the mechanical arm with the micron-scale moving precision. In addition, the method for shearing orientation has low energy consumption, high efficiency and wider achievable structure than the traditional method.
Description
Technical Field
The invention belongs to the field of liquid crystal, and particularly relates to a method for regulating and controlling the orientation of liquid crystal elements in colloidal liquid crystal.
Background
Liquid crystals are a class of mesophases that are intermediate between solids and liquids and that have both the fluidity of liquids and the structural order of parts of solids. Liquid crystal materials are generally classified into thermotropic liquid crystals and lyotropic liquid crystals: thermotropic liquid crystals change from an isotropic liquid without liquid crystals to a liquid crystal state with alignment order as the temperature decreases; the lyotropic liquid crystal is transformed into a liquid crystal state with the increase of the concentration of the mesogen in the solution. The unique structural characteristics of the liquid crystal material enable the physical properties of the liquid crystal material to have remarkable anisotropy, such as birefringence to light, anisotropic response to a magnetic field and the like; the phase change behavior of the liquid crystal also makes it responsive to temperature and concentration. Therefore, liquid crystal materials are widely used in many fields such as display screens, anisotropic elastomers, smart response materials, and functional sensors.
For the application of liquid crystal material, effective control of the alignment structure of its mesogen is a decisive factor for its application. The existing methods for controlling the orientation of the lc cells mainly achieve controllable orientation of the lc cells by high-intensity magnetic fields (adv. mater.29,1604453 (2017)) or high-frequency electric fields (nat. mater.13,394-399 (2014)). Such processes have mainly the following disadvantages:
(1) high-intensity magnetic fields and high-frequency electric fields require extremely large external energy supply and high energy consumption, and meanwhile, the requirements on equipment are high and the production cost is extremely high.
(2) To realize the orientation of the liquid crystal elements, the electromagnetic field itself needs to be designed in advance to obtain a patterned electromagnetic field, the process is complex, and the production period is too long.
(3) The existing patterning method of the electromagnetic field has limited precision and limited precision of liquid crystal orientation regulation.
(4) The existing electromagnetic field orientation method is generally only suitable for liquid crystal cells with small length-diameter ratio (<1000), and liquid crystals with large length-diameter ratio (>1000) need extremely large energy to orient the liquid crystals, so that the existing method is difficult to take effect.
(5) The existing method is only suitable for the liquid crystal element with low aspect ratio, and the orientation of the liquid crystal element with low aspect ratio is easily disturbed by the thermal motion of molecules, so that the electromagnetic field needs to be continuously applied to maintain the required orientation structure, which greatly limits the application of the liquid crystal.
The invention aims to provide a method for regulating and controlling the orientation of liquid crystal elements in colloidal liquid crystal with high precision, low cost and high efficiency aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for regulating and controlling the orientation of liquid crystal elements in colloidal liquid crystal comprises the following steps:
(1) and (3) coating the colloidal liquid crystal solution on a substrate in a blade mode to obtain the colloidal liquid crystal with uniformly pre-oriented liquid crystal elements. The concentration of the colloidal liquid crystal solution is greater than the liquid crystal phase change concentration.
(2) And (3) controlling the micron-sized probe to be immersed in the pre-oriented colloidal liquid crystal obtained in the step (1) through a mechanical arm to carry out controllable motion, so as to realize the regulation and control of the liquid crystal element orientation structure.
Further, the aspect ratio of the mesogen in the colloidal liquid crystal solution in the step (1) is more than 1000.
Further, in the step (1), the substrate and the surface of the colloidal liquid crystal solution are both hydrophilic or both hydrophobic.
Further, the diameter of the micron-sized probe in the step (2) is in the range of 1-1000 microns.
Further, the movement speed of the micrometer-scale probe in the step (2) is 0.1-1000 mm/s.
The invention has the beneficial effects that:
(1) the orientation of the liquid crystal element is controlled by the shearing force generated by the movement of the probe, the preparation process is simple and quick, the operation is convenient, the requirement on equipment is low, the production period is short, and the production efficiency is high;
(2) the regulation and control of the liquid crystal orientation are realized based on the anisotropic response of the liquid crystal to the shearing force, the assistance of an electromagnetic field with extremely high energy consumption is not needed, and the production cost is low;
(3) the regulation and control precision of the orientation structure is high, and the orientation structure of the liquid crystal can be effectively controlled in a micron scale;
(4) the method can be effectively applied to a liquid crystal system with an ultra-large length-diameter ratio (>1000), and meanwhile, the obtained oriented structure can independently and stably exist without being maintained by an external field.
In conclusion, the phase-change temperature-regulating coating obtained by the method has the characteristics of low cost, high precision, simple process, low requirement on equipment, wide application range and the like, has remarkable advantages compared with the traditional electromagnetic field regulation and control method, and is one of important methods for regulating and controlling the orientation of liquid crystals in the future.
Drawings
FIG. 1 is a flow chart of the control of the orientation of mesogen by local shearing of the present invention.
FIG. 2 is a polarization microscope photograph of examples 1 to 4 of the present invention: fig. 2 a is a polarization microscope photograph of a patterned alignment structure of the graphene oxide liquid crystal of example 1; b of fig. 2 is a polarization microscope picture of a patterned alignment structure of the graphene oxide liquid crystal of example 2; fig. 2 c is a polarization microscope photograph of the patterned alignment structure of the cellulose nano-liquid crystal of example 3; fig. 2 d is a polarization microscope photograph of the patterned alignment structure of the zirconium phosphate liquid crystal of example 4.
Detailed Description
The present invention is described in detail below with reference to the attached drawings and the embodiment, which is only used for further illustration of the present invention and is not to be understood as limiting the scope of the present invention, and the skilled person can make some insubstantial changes and modifications according to the content of the above invention.
Fig. 1 is a flow chart of the method for controlling the orientation of the liquid crystal cell by local shearing, the method utilizes a micron-sized probe controlled by a mechanical arm to generate a local shearing field in the liquid crystal, and then the orientation of the liquid crystal cell is regulated and controlled by the local shearing field.
Example 1:
(1) the graphene oxide liquid crystal solution with the average sheet diameter of 15 microns (10000< length-diameter ratio <20000) and the concentration of 3g/L is coated on a glass substrate by scraping to obtain a pre-oriented graphene oxide liquid crystal layer with the thickness of 1 mm.
(2) And (3) immersing a probe with a diameter of 10 microns and controlled by a mechanical arm into the graphene oxide liquid crystal obtained in the step (1), wherein the immersion depth is 0.5 mm.
(3) And controlling the probe to move in the graphene oxide liquid crystal at a speed of 5mm/s according to a program path through a mechanical arm to obtain the graphene oxide liquid crystal with a patterned orientation structure.
Through the steps, the obtained graphene oxide liquid crystal with the patterned orientation structure with the precision of 200 microns is regular and ordered in orientation structure, and can be further used for regulating and controlling the mechanical and electrical properties of the graphene oxide liquid crystal material, as shown in a of fig. 2.
Example 2:
(1) the graphene oxide liquid crystal with the average sheet diameter of 25 micrometers (20000 is smaller than the length-diameter ratio of 30000) and the concentration of 1g/L is coated on a glass substrate in a scraping way, so that a pre-oriented graphene oxide liquid crystal layer with the thickness of 2mm is obtained.
(2) And (3) immersing a probe with a diameter of 1000 microns and controlled by a mechanical arm into the graphene oxide liquid crystal obtained in the step (1), wherein the immersion depth is 0.3 mm.
(3) And controlling the probe to move in the graphene oxide liquid crystal at a speed of 0.1mm/s according to a program path through a mechanical arm to obtain the graphene oxide liquid crystal with a patterned orientation structure.
Through the steps, the obtained graphene oxide liquid crystal with the patterned orientation structure with the precision of 200 microns has an obvious orientation structure, as shown in b of fig. 2.
Example 3:
(1) the cellulose nanocrystalline liquid crystal solution with the length-diameter ratio of 2000 and the concentration of 5 wt.% is coated on a PMMA substrate by a doctor blade, and pre-oriented cellulose nanocrystalline liquid crystal with the thickness of 1mm is obtained.
(2) And (3) immersing a probe with a diameter of 20 microns and controlled by a mechanical arm into the cellulose nanocrystalline liquid crystal obtained in the step (1) to an immersion depth of 0.2 mm.
(3) And controlling the probe to move in the cellulose nanocrystalline liquid crystal solution at the speed of 1000mm/s according to a program path through a mechanical arm to obtain the cellulose nanocrystalline liquid crystal with a patterned orientation structure.
Through the steps, the cellulose nanocrystalline liquid crystal with the patterned orientation structure with the precision of 200 microns is obtained, the orientation structure is regular and ordered, and the cellulose nanocrystalline liquid crystal can be further used for regulating and controlling the optical performance of a cellulose nanocrystalline material, as shown in c of fig. 2.
Example 4:
(1) the liquid crystal solution of zirconium phosphate with an aspect ratio of 5000 and a concentration of 5 wt.% was knife coated onto a PET substrate to obtain a pre-oriented cellulose nanocrystalline liquid crystal with a thickness of 1 mm.
(2) And (3) immersing a probe with the diameter of 1 micron and controlled by a mechanical arm into the zirconium phosphate liquid crystal solution obtained in the step (1) to the immersion depth of 0.5 mm.
(3) And controlling the probe to move in the zirconium phosphate liquid crystal solution at the speed of 1mm/s according to a program path through a mechanical arm to obtain the zirconium phosphate liquid crystal solution with the patterned orientation structure.
Through the steps, the zirconium phosphate liquid crystal with the patterned orientation structure with the precision of 200 microns is obtained, the orientation structure is regular and ordered, and the method can be further used for regulating and controlling the mechanical property of the zirconium phosphate liquid crystal material, as shown in d of fig. 2.
Claims (5)
1. A method for regulating and controlling the orientation of liquid crystal elements in colloidal liquid crystal is characterized in that a micron-sized probe controlled by a mechanical arm is utilized to generate a local shear field in the liquid crystal, and then the orientation of the liquid crystal elements is regulated and controlled through the local shear field; the method comprises the following steps:
(1) coating a colloidal liquid crystal solution on a substrate in a blade mode to obtain colloidal liquid crystal with uniformly pre-oriented liquid crystal elements, wherein the concentration of the colloidal liquid crystal solution is greater than the liquid crystal phase change concentration of the colloidal liquid crystal solution;
(2) and (3) controlling the micron-sized probe to be immersed in the pre-oriented colloidal liquid crystal obtained in the step (1) through a mechanical arm to carry out controllable motion, so as to realize the regulation and control of the liquid crystal element orientation structure.
2. The method according to claim 1, wherein the aspect ratio of mesogens in the colloidal liquid crystal solution in step (1) is greater than 1000.
3. The method of claim 1, wherein the substrate and the surface of the colloidal liquid crystal solution in step (1) are both hydrophilic or both hydrophobic.
4. The method of claim 1, wherein the micrometer-sized probe in step (2) has a diameter ranging from 1 to 1000 micrometers.
5. The method of claim 1, wherein the micrometer-sized probe in the step (2) moves at a speed of 0.1-1000 mm/sec.
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