1
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Zhang D, Liu D, Ubukata T, Seki T. Unconventional Approaches to Light-promoted Dynamic Surface Morphing on Polymer Films. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dongyu Zhang
- Chemical Engineering and Chemistry, Eindhoven University of Technology, Helix building STO 0.41, Het Kranenveld 14, 5612AZ Eindhoven, The Netherlands
| | - Danqing Liu
- Chemical Engineering and Chemistry, Eindhoven University of Technology, Helix building STO 0.41, Het Kranenveld 14, 5612AZ Eindhoven, The Netherlands
| | - Takashi Ubukata
- Department of Chemistry and Life Science, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
| | - Takahiro Seki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
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2
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Ito A, Norisada Y, Inada S, Kondo M, Sasaki T, Sakamoto M, Ono H, Kawatsuki N. Photoinduced Reorientation and Photofunctional Control of Liquid Crystalline Copolymers with in Situ-Formed N-Benzylideneaniline Derivative Side Groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1164-1172. [PMID: 33326742 DOI: 10.1021/acs.langmuir.0c03059] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The influence of the annealing conditions on the thermally stimulated photoinduced molecular reorientation of a photoinactive liquid crystalline polymethacrylate with phenyl aldehyde and benzoic acid side groups (P1) doped with 4-methoxyaniline, which forms photoalignable 4-methoxy-N-benzylideneaniline (MNBA) side groups in situ, was investigated. Light exposure and subsequent thermal stimulation under a N2 atmosphere realized sufficient cooperative molecular reorientation (D > 0.7), but the simultaneous thermal hydrolysis of the MNBA groups under humid air lowered the molecular reorientation performance. By contrast, subsequent thermal hydrolysis of MNBA after molecular reorientation introduced different aromatic amines into the reoriented P1 film, which regulated the birefringence and photofunctionality of the oriented film.
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Affiliation(s)
- Akari Ito
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2188 Shosha, Himeji 671-2280, Japan
| | - Yunosuke Norisada
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2188 Shosha, Himeji 671-2280, Japan
| | - Shogo Inada
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2188 Shosha, Himeji 671-2280, Japan
| | - Mizuho Kondo
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2188 Shosha, Himeji 671-2280, Japan
| | - Tomoyuki Sasaki
- Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Moritsugu Sakamoto
- Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Hiroshi Ono
- Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
| | - Nobuhiro Kawatsuki
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2188 Shosha, Himeji 671-2280, Japan
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3
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Macroscopic Regulation of Hierarchical Nanostructures in Liquid-crystalline Block Copolymers towards Functional Materials. CHINESE JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1007/s10118-021-2531-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Nagano S. Random Planar Orientation in Liquid-Crystalline Block Copolymers with Azobenzene Side Chains by Surface Segregation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5673-5683. [PMID: 30096982 DOI: 10.1021/acs.langmuir.8b01824] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Rodlike liquid-crystalline (LC) mesogens preferentially adopt a homeotropic orientation by excluded volume effects at the free surface in side-chain LC (SCLC) polymer films. The homeotropic orientation is not advantageous for in-plane LC alignment processes. Surface segregation of polymers is the phenomenon in which one component with a low surface free energy covers the surface in a mixture of two or more polymers or a block copolymer film. In SCLC block copolymer films, the surface segregation structure induces a random planar orientation due to the formation of a microphase-separated interface parallel to the substrate via the covering of one of the segregated polymer blocks. This feature article focuses on the unique, random planar orientation induced by the surface segregation of SCLC block copolymer films with the photoresponsive azobenzene (Az) mesogenic group. A transition moment of the Az mesogens is parallel to the molecular long axis, and light irradiation is conducted perpendicular to the film surface in general photoreaction processes. Therefore, the homeotropic molecular orientation in the SCLC polymer systems with Az mesogenic units inhibits efficient photoreaction reorientations in thin films. The random planar orientations by the surface segregation of a coil block in SCLC block polymers provide efficient in-plane photoreorientation and photoswitching with LC hierarchical mesostructures, such as microphase-separated structures of SCLC block copolymers and laminated LC polymer films. On the other hand, surface-segregated SCLC blocks form a high-density polymer LC brush layer with a random planar orientation by self-assembly, which exhibits efficient angular selective photoreactions. These approaches using the surface segregation of SCLC block copolymers are expected to offer new concepts for the LC photoalignment process for LC polymer devices.
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Affiliation(s)
- Shusaku Nagano
- Venture Business Laboratory, Nagoya University , Furo-cho, Chikusa, Nagoya 464-8603 , Japan
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5
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Introducing planar hydrophobic groups into an alkyl-sulfonated rigid polyimide and how this affects morphology and proton conductivity. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Chen Y, Huang S, Wang T, Dong Z, Yu H. Confined Self-Assembly Enables Stabilization and Patterning of Nanostructures in Liquid-Crystalline Block Copolymers. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02435] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Yuxuan Chen
- Department of Material Science and Engineering, College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
| | - Shuai Huang
- Department of Material Science and Engineering, College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
| | - Tianjie Wang
- Department of Material Science and Engineering, College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
| | - Zhijiao Dong
- Department of Material Science and Engineering, College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
| | - Haifeng Yu
- Department of Material Science and Engineering, College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
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7
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Li X, Yanagimachi T, Bishop C, Smith C, Dolejsi M, Xie H, Kurihara K, Nealey PF. Engineering the anchoring behavior of nematic liquid crystals on a solid surface by varying the density of liquid crystalline polymer brushes. SOFT MATTER 2018; 14:7569-7577. [PMID: 30065982 DOI: 10.1039/c8sm00991k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Controlling the orientation of liquid crystal (LC) molecules towards contacting surfaces is a crucial requirement for the development of LC displays and passive electro-optical devices. Up to now, research has been focused on photo-responses of a LC azobenzene polymer system to obtain either planar or homeotropic orientation of LCs. It remains a challenge, however, to tune the polar angle of LC molecules on the solid surface and gain more insights about the polymer chain conformation extending in LC medium. Here, we deposit a liquid crystalline side chain polymer brush, poly(6-(4-methoxy-azobenzene-4'-oxy)hexyl methacrylate) (PMMAZO), onto the solid surface with film thickness varying between ∼3 nm and 13 nm; therefore, the grafting density of the brush layer ranges from 0.0219 to 0.0924 chains per nm2. When LCs are confined in hybrid cells with a top surface eliciting uniform homeotropic anchoring and a bottom surface covered by the PMMAZO brush, the out-of-plane polar angle of 4-pentyl-4'-cyanobiphenyl (5CB) on the brush layer gradually changes from ∼0° to ∼62° by simply increasing the grafting brush density. The surface forces apparatus (SFA) measurement is used to determine 5CB as a good solvent for the PMMAZO brush and understand the relationship between the chain conformation in 5CB and the anchoring behavior of LC molecules on the polymer brush layer. For high grafting density, the polymer chain in 5CB extends significantly away from the substrate, making the side chain mesogens on average almost parallel to the substrate; for the low-density case, the main chain extends in the narrow region around the surface for aligning the mesogens perpendicular to the substrate.
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Affiliation(s)
- Xiao Li
- Institute for Molecular Engineering, University of Chicago, Chicago, USA.
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8
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Takakura K, Ono Y, Suetsugu K, Hara M, Nagano S, Abe T, Nagao Y. Lyotropic ordering for high proton conductivity in sulfonated semialiphatic polyimide thin films. Polym J 2018. [DOI: 10.1038/s41428-018-0111-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Seki T. A Wide Array of Photoinduced Motions in Molecular and Macromolecular Assemblies at Interfaces. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180076] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Takahiro Seki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8603, Japan
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10
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Nagano S. Surface and interface designs in side-chain liquid crystalline polymer systems for photoalignment. Polym J 2018. [DOI: 10.1038/s41428-018-0100-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Ikoma H, Kondo M, Kawatsuki N. Photoinduced Reorientation and Surface Relief Formation in Diblock and Random Copolymers with Benzoic Acid and Alkyloxy Side Groups. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hiromi Ikoma
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Shosha, Himeji 671-2280, Japan
| | - Mizuho Kondo
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Shosha, Himeji 671-2280, Japan
| | - Nobuhiro Kawatsuki
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Shosha, Himeji 671-2280, Japan
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12
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Kawatsuki N, Inada S, Fujii R, Kondo M. Photoinduced Birefringent Pattern and Photoinactivation of Liquid-Crystalline Copolymer Films with Benzoic Acid and Phenylaldehyde Side Groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2089-2095. [PMID: 29320192 DOI: 10.1021/acs.langmuir.7b04096] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In situ formation of N-benzylideneaniline (NBA) side groups achieved photoinduced cooperative reorientation of photoinactive copolymers with phenylaldehyde (PA) and benzoic acid (BA) side groups doped with 4-methoxyaniline (AN) molecules. Thermally stimulated molecular reorientation of the side groups was generated due to the axis-selective photoreaction of the NBA moieties. Selective coating with AN on the copolymer film formed NBA moieties in the desired region, resulting in a photoinduced birefringent pattern. Additionally, postannealing at an elevated temperature for a long time attained photoinactivation of the reoriented film, and recoating with AN to form NBA achieved the multiple birefringent patterns and repatterning of the reoriented structures. The slow thermal hydrolysis of NBA, which was 50 times slower than the thermally stimulated self-organization of the side groups due to the presence of BA side groups, contributed to the photodurability of the reoriented film and multiple birefringent patterns.
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Affiliation(s)
- Nobuhiro Kawatsuki
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Shogo Inada
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Ryosuke Fujii
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Mizuho Kondo
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
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13
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Han L, Ma H, Zhu S, Liu P, Shen H, Yang L, Tan R, Huang W, Li Y. Effect of Topology and Composition on Liquid Crystal Order and Self-Assembly Performances Driven by Asynchronously Controlled Grafting Density. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01952] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Li Han
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Hongwei Ma
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Siqi Zhu
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Pibo Liu
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Heyu Shen
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Lincan Yang
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Rui Tan
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Wei Huang
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
| | - Yang Li
- State Key Laboratory
of Fine
Chemicals, Department of Polymer Science and Engineering, Liaoning
key Laboratory of Polymer Science and Engineering, School of Chemical
Engineering, Dalian University of Technology, Dalian Liaoning 116024, China
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14
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Nickmans K, Bögels GM, Sánchez-Somolinos C, Murphy JN, Leclère P, Voets IK, Schenning APHJ. 3D Orientational Control in Self-Assembled Thin Films with Sub-5 nm Features by Light. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1701043. [PMID: 28736935 DOI: 10.1002/smll.201701043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 06/01/2017] [Indexed: 05/21/2023]
Abstract
While self-assembled molecular building blocks could lead to many next-generation functional organic nanomaterials, control over the thin-film morphologies to yield monolithic sub-5 nm patterns with 3D orientational control at macroscopic length scales remains a grand challenge. A series of photoresponsive hybrid oligo(dimethylsiloxane) liquid crystals that form periodic cylindrical nanostructures with periodicities between 3.8 and 5.1 nm is studied. The liquid crystals can be aligned in-plane by exposure to actinic linearly polarized light and out-of-plane by exposure to actinic unpolarized light. The photoalignment is most efficient when performed just under the clearing point of the liquid crystal, at which the cylindrical nanostructures are reoriented within minutes. These results allow the generation of highly ordered sub-5 nm patterns in thin films at macroscopic length scales, with control over the orientation in a noncontact fashion.
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Affiliation(s)
- Koen Nickmans
- Laboratory of Functional Organic Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands
| | - Gerardus M Bögels
- Laboratory of Functional Organic Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands
| | - Carlos Sánchez-Somolinos
- Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Jeffrey N Murphy
- Laboratory of Functional Organic Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands
| | - Philippe Leclère
- Laboratory for Chemistry of Novel Materials, Center for Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 20, B 7000, Mons, Belgium
| | - Ilja K Voets
- Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- Laboratory of Macromolecular and Organic Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
- Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
| | - Albertus P H J Schenning
- Laboratory of Functional Organic Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands
- Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600, MB, Eindhoven, The Netherlands
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15
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Zhang W, Kragt S, Schenning APH, de Haan LT, Zhou G. Easily Processable Temperature-Responsive Infrared-Reflective Polymer Coatings. ACS OMEGA 2017; 2:3475-3482. [PMID: 31457669 PMCID: PMC6641380 DOI: 10.1021/acsomega.7b00454] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/20/2017] [Indexed: 05/25/2023]
Abstract
A temperature-responsive near-infrared reflective coating was fabricated based on a side-chain liquid crystal siloxane polymer using a simple wired-bar method. The cholesteric liquid crystalline polymer film showed a blue shift of the reflection band of ∼1000 nm in the IR region upon heating. The temperature-responsive change of the reflection band was reversible. Compared to that of the same mixture system in an alignment cell, the coating showed a significantly faster response. This research demonstrates an easy way to prepare a temperature-responsive IR-reflective coating that shifts its reflection to a shorter wavelength upon heating. As IR radiation of shorter wavelengths is more strongly represented in sunlight than longer wavelengths, this coating could be used to selectively reduce heating of an indoor space when the temperature is high. This is promising for the future application of smart climate control.
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Affiliation(s)
- Weixin Zhang
- SCNU-TUE
Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou
Higher Education Mega Center, 510006 Guangzhou, China
| | - Stijn Kragt
- Laboratory
of Functional Organic Materials and Devices, Department of Chemical
Engineering and Chemistry, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Albertus P. H.
J. Schenning
- SCNU-TUE
Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou
Higher Education Mega Center, 510006 Guangzhou, China
- Laboratory
of Functional Organic Materials and Devices, Department of Chemical
Engineering and Chemistry, Eindhoven University
of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Laurens T. de Haan
- SCNU-TUE
Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou
Higher Education Mega Center, 510006 Guangzhou, China
- Shenzhen
Guohua Optoelectronics Tech. Co. Ltd., No. 1301-1, Tourism Road, Dabu
Xiang, Longhua District, 518110 Shenzhen, China
| | - Guofu Zhou
- SCNU-TUE
Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, No. 378, West Waihuan Road, Guangzhou
Higher Education Mega Center, 510006 Guangzhou, China
- Shenzhen
Guohua Optoelectronics Tech. Co. Ltd., No. 1301-1, Tourism Road, Dabu
Xiang, Longhua District, 518110 Shenzhen, China
- Academy
of Shenzhen Guohua Optoelectronics, No. 1301-1, Tourism Road, Dabu Xiang, Longhua District, Shenzhen 518110, China
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16
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Wang T, Li X, Dong Z, Huang S, Yu H. Vertical Orientation of Nanocylinders in Liquid-Crystalline Block Copolymers Directed by Light. ACS APPLIED MATERIALS & INTERFACES 2017; 9:24864-24872. [PMID: 28670902 DOI: 10.1021/acsami.7b06086] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The microphase-separated nanostructures of block copolymers are ideal nanotemplates for advanced fabrication, but they are greatly limited by the rapid and precise manipulation especially at room temperature. Here we report one method of light-directed regulation of nanostructures in thin films of liquid-crystalline diblock copolymers containing azobenzene units as photoresponsive mesogens. The in-plane orientated nanocylinders in thin film can be light-directed into out-of-plane on a time scale of seconds at room temperature. This fast regulation is beneficial from the fast process of photoinduced phase transition of the mesogenic block from liquid crystal to disordered isotropic phase. Several influence factors like the molecular weight of polymer, film thickness, light intensity, and relative humidity were studied in the light-directed processes. In addition, the photoregulated nanostructures demonstrate their capability of being photopatterned and further used as nanotemplates for fabrication of nanoparticles. The light-directed method shows noncontact, precise, and reversible features, enabling it to find further applications in fast control of nanostructures for nanofabrication and nanoengineering.
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Affiliation(s)
- Tianjie Wang
- Department of Materials Science and Engineering, College of Engineering and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, P. R. China
| | - Xiao Li
- Department of Materials Science and Engineering, College of Engineering and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, P. R. China
| | - Zhijiao Dong
- Department of Materials Science and Engineering, College of Engineering and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, P. R. China
| | - Shuai Huang
- Department of Materials Science and Engineering, College of Engineering and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, P. R. China
| | - Haifeng Yu
- Department of Materials Science and Engineering, College of Engineering and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University , Beijing 100871, P. R. China
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17
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Beppu K, Nagashima Y, Hara M, Nagano S, Seki T. Photoalignment of Vertically Oriented Microphase Separated Lamellae in LC-LC Diblock Copolymer Thin Film. Macromol Rapid Commun 2017; 38. [DOI: 10.1002/marc.201600659] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 11/15/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Koichiro Beppu
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Yuki Nagashima
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Mituo Hara
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Shusaku Nagano
- Nagoya University Venture Business Laboratory; Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Takahiro Seki
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa Nagoya 464-8603 Japan
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18
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Kawatsuki N, Fujii R, Fujioka Y, Minami S, Kondo M. Birefringent Pattern Formation in Photoinactive Liquid Crystalline Polymer Films Based on a Photoalignment Technique with Top-Coating of Cinnamic Acid Derivatives via H-Bonds. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2427-2432. [PMID: 28195485 DOI: 10.1021/acs.langmuir.7b00079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The application of a top-coating of 4-methoxy cinnamic acid (MCA) onto a photoinactive liquid crystalline polymeric film containing benzoic acid (BA) side groups (P6BAM) is shown to enable thermally stimulated, photoinduced reorientation of the polymer structure. Annealing the MCA-coated P6BAM films leads to H-bond formation between BA and MCA, which also effectively smooths the film surface. Exposure to linearly polarized (LP) UV light initiates axis-selective photoreaction of the MCA groups; subsequent thermal treatment in the LC temperature range of P6BAM amplifies molecular reorientation of the BA side groups, while simultaneously eliminating the MCA molecules. Selective inkjet coating of MCA provides a facile route for the fabrication of patterned, oriented, and rewritable P6BAM films with multiple controlled alignment directions.
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Affiliation(s)
- Nobuhiro Kawatsuki
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Ryosuke Fujii
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Yu Fujioka
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Satoshi Minami
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
| | - Mizuho Kondo
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo , Shosha, Himeji 671-2280, Japan
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Bisoyi HK, Li Q. Light-Driven Liquid Crystalline Materials: From Photo-Induced Phase Transitions and Property Modulations to Applications. Chem Rev 2016; 116:15089-15166. [PMID: 27936632 DOI: 10.1021/acs.chemrev.6b00415] [Citation(s) in RCA: 402] [Impact Index Per Article: 50.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Light-driven phenomena both in living systems and nonliving materials have enabled truly fascinating and incredible dynamic architectures with terrific forms and functions. Recently, liquid crystalline materials endowed with photoresponsive capability have emerged as enticing systems. In this Review, we focus on the developments of light-driven liquid crystalline materials containing photochromic components over the past decade. Design and synthesis of photochromic liquid crystals (LCs), photoinduced phase transitions in LC, and photoalignment and photoorientation of LCs have been covered. Photomodulation of pitch, polarization, lattice constant and handedness inversion of chiral LCs is discussed. Light-driven phenomena and properties of liquid crystalline polymers, elastomers, and networks have also been analyzed. The applications of photoinduced phase transitions, photoalignment, photomodulation of chiral LCs, and photomobile polymers have been highlighted wherever appropriate. The combination of photochromism, liquid crystallinity, and fabrication techniques has enabled some fascinating functional materials which can be driven by ultraviolet, visible, and infrared light irradiation. Nanoscale particles have been incorporated to widen and diversify the scope of the light-driven liquid crystalline materials. The developed materials possess huge potential for applications in optics, photonics, adaptive materials, nanotechnology, etc. The challenges and opportunities in this area are discussed at the end of the Review.
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Affiliation(s)
- Hari Krishna Bisoyi
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University , Kent, Ohio 44242, United States
| | - Quan Li
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University , Kent, Ohio 44242, United States
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