CN106977905A - A kind of photonic crystal composite with environment-responsive and preparation method thereof - Google Patents
A kind of photonic crystal composite with environment-responsive and preparation method thereof Download PDFInfo
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- CN106977905A CN106977905A CN201710239300.9A CN201710239300A CN106977905A CN 106977905 A CN106977905 A CN 106977905A CN 201710239300 A CN201710239300 A CN 201710239300A CN 106977905 A CN106977905 A CN 106977905A
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- cellulose nanocrystal
- aqueous polyurethane
- nanocrystal body
- photonic crystal
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
- C08L1/04—Oxycellulose; Hydrocellulose, e.g. microcrystalline cellulose
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/02—Cellulose; Modified cellulose
- C09D101/04—Oxycellulose; Hydrocellulose
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/04—Oxycellulose; Hydrocellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
- C08J2401/04—Oxycellulose; Hydrocellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Abstract
The present invention relates to a kind of response Cellulose nanocrystal body/polyurethane flexible photon paper and coating material and preparation method thereof.Cellulose nanocrystal body or its suspension are well mixed by the present invention with aqueous polyurethane emulsion, crosslinking agent, after drying and forming-film or coating, and heating carries out cross-linking reaction, obtains flexible photonic paper or coating.There is resulting materials humidity to respond and solvent polarity response color shifting properties, can use water repeated writing, dominant or stealthy pattern can be write with salting liquid.Compared with prior art, the photon paper and coating material preparation technology that prepared by the present invention are simple, environmental protection, are adapted to prepare on a large scale, are had broad application prospects in the field such as photon paper, anti-fake encrpted, sensor.
Description
Technical field
The present invention relates to belonging to materials science field, more particularly to a kind of photonic crystal with environment-responsive is multiple
Condensation material and preparation method thereof.
Background technology
Photonic crystal is that formed material is arranged by different refractivity medium period.By adjusting itself photon band gap
Structure is stimulated outfield（Such as physical action, chemical action and biological agent）The photon crystal material responded, is referred to as responded
Property photon crystal material.This material has potential using value in the field such as sensor, environmental monitoring, clinical diagnosis, false proof.
The conventional method for preparing Responsive photonic crystals material is typically that functional polymer hydrogel is incorporated into dispersed nano
Particle assembling into photonic crystal masterplate in formed.But this method preparation process is comparatively laborious, searching is needed badly a kind of simpler
Easy method.
Cellulose nanocrystal body is the bar-shaped nano particle obtained by cellulosic material acidolysis, with excellent mechanical property
Can, good biocompatibility and the advantages of larger specific surface area, improving composite materials property and bio-medical
There is broad prospect of application in field.In addition, also there is Cellulose nanocrystal body unique self-assembly property, its suspension to be made after drying
The Cellulose nanocrystal body film obtained has gorgeous schemochrome, belongs to one-dimensional photon crystal material.Meanwhile, Cellulose nanocrystal
Body film has photo response.The change of environment reclaimed water and humidity can change the pitch of its chiral nematic structure, and macro manifestations go out
The change of color.However, Cellulose nanocrystal body film fragility is very big, meets intensity after water and substantially reduce, significantly limit it should
With, therefore can be by the compound pliability and water resistance for improving material of itself and polymer.
The Cellulose nanocrystal body reported at present is with being largely by adding nanometer in the compound material prepared of polymer
Cellulose improves the mechanical property of polymer, and the material of preparation do not have special optical property.Only a small amount of prepare has liquid
The research of the Cellulose nanocrystal composite material of crystal structure, but it is not all studied as the property of photon paper or discoloration coating
Energy.
The content of the invention
The problem of existing for prior art, it is an object of the invention to provide a kind of photon with environment-responsive is brilliant
Composite material and preparation method thereof.The preparation method that the present invention is provided can quickly, it is easy, obtained composite can use water
Repeated writing, can write dominant and stealthy word with salting liquid.
The purpose of the present invention can be achieved through the following technical solutions：A kind of photonic crystal with environment-responsive is answered
The preparation method of condensation material, comprises the following steps：By Cellulose nanocrystal body or its suspension and aqueous polyurethane emulsion, crosslinking
Agent is mixed, after drying, and heating carries out cross-linking reaction, obtains the photonic crystal composite.
In the present invention, the Cellulose nanocrystal body or its suspension and aqueous polyurethane emulsion, crosslinking agent mixing rear overhang
The pH of supernatant liquid is 3-9, preferably 4-7.
In the present invention, the aqueous polyurethane is anion-type water-thinned polyurethane.
In the present invention, the crosslinking agent is watersoluble closed type aliphatic polymeric isocyanate crosslinking agent, and ambient-temp-stable is heated to
More than certain temperature start deblocking crosslinking.
In the present invention, the plain nanocrystal of the Fiber In Composite Material and aqueous polyurethane mass ratio are 9.5~4：0.5~
6。
In the present invention, the aqueous polyurethane is 20 with crosslinking agent quality ratio:1~5:1.
In the present invention, the drying is to be placed in container drying and forming-film by mixed solution or be coated in substrate surface to dry shape
Into coating.
In the present invention, the heating-up temperature of the cross-linking reaction is 100-120 DEG C.
The present invention also protects the photonic crystal composite wood with environment-responsive prepared by method made above
Material.
Compared with prior art, the Cellulose nanocrystal body of present invention raw material wide material sources using in nature leads to as masterplate
Cross and mixed with aqueous polyurethane emulsion and the method for evaporation-induced self-assembly is prepared for the light with environment-responsive at normal temperatures
Sub- crystal composite material.Material prepared by the present invention both can be coated in other base material tables as coating again as film
Face, the film or coating of preparation can use water repeated writing, and with humidity response and solvent polarity response color shifting properties.Use
The salting liquid of low concentration can write pattern stealthy after drying, and pattern shows under high humidity conditions；Use higher concentration
Salting liquid can be recycled after can writing the pattern developed the color after drying, and washing.Preparation technology of the present invention is simple, it is not necessary to
Large number quipments and complicated operating process, preparation process green non-pollution are adapted to large-scale preparation, and the preparation provided rings
The method of answering property photonic crystal composite, which is extended to, to be prepared on other waterborne polymeric photonic crystal composites.It is prepared
Material had broad application prospects in the field such as photon paper, anti-fake encrpted, sensor.
Brief description of the drawings
Below in conjunction with accompanying drawing, the invention will be further described：
Fig. 1 is the scanning electron microscopic picture of the Cellulose nanocrystal body/compound polyurethane material photon crystal film cross section prepared；
Fig. 2 is the photon by adjusting a series of different colours that Cellulose nanocrystal body and aqueous polyurethane ratio are prepared
The diffraction wavelength spectrogram of crystal film；
Fig. 3 mixes for the Cellulose nanocrystal body/compound polyurethane material photon crystal film prepared in different proportion ethanol/water
Diffraction wavelength spectrogram in solvent；
Fig. 4 is writes on Cellulose nanocrystal body/compound polyurethane material photon crystal film of preparation with water, word after drying
The photo of disappearance, repeats writing；
Fig. 5 is placed in color under high humidity environment for the Cellulose nanocrystal body/compound polyurethane material photon crystal film prepared
Change, the photo that color is recovered after drying；
Fig. 6 is write for the Cellulose nanocrystal body/compound polyurethane material photonic crystal coating prepared with water, and word disappears after drying
Photo, repeat writing；
Fig. 7 is molten with low concentration sodium chloride on Cellulose nanocrystal body/compound polyurethane material photonic crystal coating of preparation
Word is stealthy after liquid is write, salting liquid is dried, the photo that writing shows again under high humidity conditions, and erasable rear repetition can be washed with water
Use；
Fig. 8 is molten with high concentration sodium chloride on Cellulose nanocrystal body/compound polyurethane material photonic crystal coating of preparation
Liquid writes and the dried photo of salting liquid, and writing can retain for a long time, and as humidity change changes color, can be washed with water erasable
After reuse.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, without structure
Into limitation of the present invention.
Embodiment 1
By Cellulose nanocrystal liquid suspension（PH=5, mass fraction is 3.5%）With aqueous polyurethane emulsion（Mass fraction 5%）、
Crosslinking agent（Mass fraction 20%）Mix by a certain percentage, magnetic agitation 30 min, ultrasonically treated 40min, then take out 3ml molten
Liquid is poured into diameter 6cm PS culture dishes, drying and forming-film under room temperature condition.Film is then placed in 105 DEG C of heating 2 in baking oven
Hour completes cross-linking reaction.By adjusting the ratio of Cellulose nanocrystal body and aqueous polyurethane, it can prepare a series of
The photon crystal film of different colours, and film shows different colors in different proportion ethanol/water mixed solvent.
Fig. 1 is the ESEM of the Cellulose nanocrystal body/compound polyurethane material photon crystal film cross section prepared
Picture, it can be seen that its stratiform chiral nematic structure, exactly this microstructure imparts the unique optical property of film.
Fig. 2 is by adjusting a series of different colours that Cellulose nanocrystal body and aqueous polyurethane ratio are prepared
The diffraction wavelength spectrogram of photon crystal film.It can be seen that with the increase of aqueous polyurethane ratio, the maximum absorption wave of film
Long continuous red shift, 625nm when being gradually increased to aqueous polyurethane mass fraction 60% by the 332nm of pure cellulose nanocrystal.
Fig. 3 is the Cellulose nanocrystal body/compound polyurethane material photon crystal film prepared in different proportion ethanol/water
The diffraction wavelength spectrogram of in the mixed solvent.It can be seen that 441nm of the film color from straight alcohol is gradually become in water volume
Fraction is 600nm in 60% ethanol/water mixed solution or so.
Embodiment 2
By Cellulose nanocrystal liquid suspension（PH=6, mass fraction is 5%）With aqueous polyurethane emulsion（Mass fraction 6%）, hand over
Join agent（Mass fraction 20%）By solid content 4:6:0.6 mixing, magnetic agitation 30 min, ultrasonically treated 40min then take out
3ml solution is poured into diameter 6cm PS culture dishes, drying and forming-film under room temperature condition.Film is then placed in baking oven 105 DEG C
Heating completes cross-linking reaction in 2 hours.Write, macroscopic significant change occurs for film color, done on the membrane with water
Dry rear film color is recovered, and can be with repeated writing.
Fig. 4 dries to be write on Cellulose nanocrystal body/compound polyurethane material photon crystal film of preparation with water
The photo that word disappears afterwards, repeats writing.
Embodiment 3
By Cellulose nanocrystal liquid suspension（PH=7, mass fraction is 3.5%）With aqueous polyurethane emulsion（Mass fraction 5%）、
Crosslinking agent（Mass fraction 20%）By solid content 9:1:0.1 mixing, magnetic agitation 30 min, ultrasonically treated 40min then take out
3ml solution is poured into diameter 6cm PS culture dishes, drying and forming-film under room temperature condition.Film is then placed in baking oven 105 DEG C
Heating completes cross-linking reaction in 2 hours.The film is placed in high humidity environment（RH>85%）After middle a few minutes, film color occurs
Macroscopic change, is replaced in film color under low-humidity environment and recovers rapidly, and can be with Reusability.
Fig. 5 is placed under high humidity environment for the Cellulose nanocrystal body/compound polyurethane material photon crystal film prepared
Color change, the photo that color is recovered after drying.
Embodiment 4
By Cellulose nanocrystal liquid suspension（PH=4, mass fraction is 2.5%）With aqueous polyurethane emulsion（Mass fraction 5%）、
Crosslinking agent（Mass fraction 20%）By solid content 4:6:0.6 mixing, magnetic agitation 30 min, ultrasonically treated 40min, finally with shifting
Liquid device takes 2ml solution to be uniformly coated on slide, and is dried at room temperature for forming coating.Then slide is placed in baking oven
105 DEG C of heating complete cross-linking reaction in 2 hours.Write with water-color paintbrush on the coating, coating color occurs macroscopic obvious
Change, coating color recovers after drying, and can be with repeated writing.
Fig. 6 is write for the Cellulose nanocrystal body/compound polyurethane material photonic crystal coating prepared with water, word after drying
Mark disappears, and repeats writing.
Embodiment 5
By Cellulose nanocrystal liquid suspension（PH=5, mass fraction is 3.5%）With aqueous polyurethane emulsion（Mass fraction 10%）、
Crosslinking agent（Mass fraction 20%）By solid content 9:1:0.1 mixing, magnetic agitation 30 min, ultrasonically treated 40min, finally with shifting
Liquid device takes 2ml solution to be uniformly coated on slide, and is dried at room temperature for forming coating.Then slide is placed in baking oven
105 DEG C of heating complete cross-linking reaction in 2 hours.Write with low concentration sodium chloride solution on the coating, meat occurs for coating color
The visible significant change of eye, writing is stealthy after drying, and the writing under high humidity environment on coating shows again.Use high concentration
Sodium chloride solution writes on the coating, and macroscopic significant change occurs for coating color, and writing can be for a long time after drying
Retain, writing color changes after humidity change, and erasable rear Palingraphia can be washed with water.
Fig. 7 is to use low concentration chlorination on Cellulose nanocrystal body/compound polyurethane material photonic crystal coating of preparation
Writing is stealthy after sodium solution is write, salting liquid is dried, the photo that writing shows again under high humidity conditions.
Fig. 8 is to use high concentration chlorination on Cellulose nanocrystal body/compound polyurethane material photonic crystal coating of preparation
Sodium solution writes and the dried photo of salting liquid.
Above embodiment describes the general principle and principal character of the present invention.The technical staff of the industry should
Understand, protection scope of the present invention is not restricted to the described embodiments, any change expected without creative work or
Replace, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with claims institute
The protection domain of restriction is defined.
Claims (9)
1. a kind of preparation method of the photonic crystal composite with environment-responsive, it is characterised in that comprise the following steps：
Cellulose nanocrystal body or its suspension are mixed with aqueous polyurethane emulsion, crosslinking agent, after drying, heating progress is crosslinked instead
Should, obtain the photonic crystal composite.
2. the preparation method according to claims 1, it is characterised in that：The Cellulose nanocrystal body or its suspension with
Aqueous polyurethane emulsion, the pH of crosslinking agent mixing rear suspension liquid are 3-9, preferably 4-7.
3. the preparation method according to claims 1, it is characterised in that：The aqueous polyurethane is anion-type water-thinned poly-
Urethane.
4. the preparation method according to claims 1, it is characterised in that：The crosslinking agent is watersoluble closed type aliphatic poly
Isocyanate crosslinking.
5. the preparation method according to claims 1, it is characterised in that：In the composite, Cellulose nanocrystal body
It is 9.5~4 with aqueous polyurethane mass ratio：0.5~6.
6. the preparation method according to claims 1, it is characterised in that：The aqueous polyurethane is with crosslinking agent quality ratio
20:1~5:1.
7. the preparation method according to claims 1, it is characterised in that：The drying is that mixed solution is placed in container
Drying and forming-film is coated in substrate surface and dries to form coating.
8. the preparation method according to claims 1, it is characterised in that：The heating-up temperature of the cross-linking reaction is 100-
120℃。
9. the photonic crystal composite wood with environment-responsive prepared according to any one of claim 1-8 preparation method
Material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710239300.9A CN106977905A (en) | 2017-04-13 | 2017-04-13 | A kind of photonic crystal composite with environment-responsive and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710239300.9A CN106977905A (en) | 2017-04-13 | 2017-04-13 | A kind of photonic crystal composite with environment-responsive and preparation method thereof |
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| Publication Number | Publication Date |
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| CN106977905A true CN106977905A (en) | 2017-07-25 |
Family
ID=59345817
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705297A (en) * | 2018-12-05 | 2019-05-03 | 万华化学集团股份有限公司 | The fast expansion type filling polyurethane foam compositions of the warm and humid response of one kind and preparation method and purposes |
| CN110218360A (en) * | 2019-05-31 | 2019-09-10 | 华南理工大学 | A kind of flexible waterproof CNC/PEGDA photon crystal material and preparation method thereof |
| CN110845749A (en) * | 2019-12-05 | 2020-02-28 | 齐鲁工业大学 | Preparation method of broadband reflection film with chiral nematic structure |
| CN111040225A (en) * | 2019-12-05 | 2020-04-21 | 中山大学 | Repeatedly erasable anti-counterfeiting film based on photonic crystal structural color and preparation method and application thereof |
| CN111189566A (en) * | 2020-02-20 | 2020-05-22 | 河南工程学院 | Pressure sensor based on self-assembled cellulose nanocrystals and preparation method thereof |
| CN113059942A (en) * | 2021-02-24 | 2021-07-02 | 中山大学 | Chiral-wettability dual-response anti-counterfeiting film and preparation method and application thereof |
| WO2021191468A1 (en) | 2020-03-27 | 2021-09-30 | Technische Universiteit Eindhoven | Responsive photonic coating |
| CN113771516A (en) * | 2020-06-09 | 2021-12-10 | 天津科技大学 | Photon anti-counterfeiting pattern preparation method based on cellulose nanocrystalline composite film |
-
2017
- 2017-04-13 CN CN201710239300.9A patent/CN106977905A/en active Pending
Non-Patent Citations (1)
| Title |
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| 万昊: "以纤维素纳米晶体为模板的手性向列结构材料的制备与性能研究", 《中国优秀硕士论文全文数据库(电子期刊)-工程科技I辑》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109705297A (en) * | 2018-12-05 | 2019-05-03 | 万华化学集团股份有限公司 | The fast expansion type filling polyurethane foam compositions of the warm and humid response of one kind and preparation method and purposes |
| CN109705297B (en) * | 2018-12-05 | 2021-04-20 | 万华化学集团股份有限公司 | Temperature-humidity response fast-foaming polyurethane filling foam composition, and preparation method and application thereof |
| CN110218360A (en) * | 2019-05-31 | 2019-09-10 | 华南理工大学 | A kind of flexible waterproof CNC/PEGDA photon crystal material and preparation method thereof |
| CN110218360B (en) * | 2019-05-31 | 2021-05-14 | 华南理工大学 | Flexible water-resistant CNC/PEGDA photonic crystal material and preparation method thereof |
| CN110845749A (en) * | 2019-12-05 | 2020-02-28 | 齐鲁工业大学 | Preparation method of broadband reflection film with chiral nematic structure |
| CN111040225A (en) * | 2019-12-05 | 2020-04-21 | 中山大学 | Repeatedly erasable anti-counterfeiting film based on photonic crystal structural color and preparation method and application thereof |
| CN110845749B (en) * | 2019-12-05 | 2022-05-17 | 齐鲁工业大学 | Preparation method of broadband reflection film with chiral nematic structure |
| CN111189566A (en) * | 2020-02-20 | 2020-05-22 | 河南工程学院 | Pressure sensor based on self-assembled cellulose nanocrystals and preparation method thereof |
| WO2021191468A1 (en) | 2020-03-27 | 2021-09-30 | Technische Universiteit Eindhoven | Responsive photonic coating |
| CN113771516A (en) * | 2020-06-09 | 2021-12-10 | 天津科技大学 | Photon anti-counterfeiting pattern preparation method based on cellulose nanocrystalline composite film |
| CN113059942A (en) * | 2021-02-24 | 2021-07-02 | 中山大学 | Chiral-wettability dual-response anti-counterfeiting film and preparation method and application thereof |
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