151
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Yan J, Kang C, Bian Z, Jin R, Ma X, Gao L. Supramolecular self-assembly of chiral polyimides driven by repeat units and end groups. NEW J CHEM 2017. [DOI: 10.1039/c7nj02451g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Complementary aromatic π–π stacking and hydrogen bonding induce time-dependent chiroptical spectroscopic behaviours of l-phenylalaninate-derived chiral polyimide.
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Affiliation(s)
- Jijun Yan
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Chuanqing Kang
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Zheng Bian
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Rizhe Jin
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Xiaoye Ma
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
| | - Lianxun Gao
- State Key Laboratory of Polymer Physics and Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- China
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152
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Wang X, Tang Z. Circular Dichroism Studies on Plasmonic Nanostructures. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1601115. [PMID: 27273904 DOI: 10.1002/smll.201601115] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 04/22/2016] [Indexed: 06/06/2023]
Abstract
In recent years, optical chirality of plasmonic nanostructures has aroused great interest because of innovative fundamental understanding as well as promising potential applications in optics, catalysis and sensing. Herein, state-of-the-art studies on circular dichroism (CD) characteristics of plasmonic nanostructures are summarized. The hybrid of achiral plasmonic nanoparticles (NPs) and chiral molecules is explored to generate a new CD response at the plasmon resonance as well as the enhanced CD intensity of chiral molecules in the UV region, owing to the Coulomb static and dynamic dipole interactions between plasmonic NPs and chiral molecules. As for chiral assembly of plasmonic NPs, plasmon-plasmon interactions between the building blocks are found to induce generation of intense CD response at the plasmon resonance. Three-dimensional periodical arrangement of plasmonic NPs into macroscale chiral metamaterials is further introduced from the perspective of negative refraction and photonic bandgap. A strong CD signal is also discerned in achiral planar plasmonic nanostructures under illumination of circular polarized plane wave at oblique incidence or input vortex beam at normal incidence. Finally perspectives, especially on future investigation of time-resolved CD responses, are presented.
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Affiliation(s)
- Xiaoli Wang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P.R. China
| | - Zhiyong Tang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P.R. China
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153
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Mu B, Li Q, Li X, Chen J, Fang J, Chen D. Self-assembled helical columnar superstructures with selective homochirality. Polym Chem 2017. [DOI: 10.1039/c7py00471k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Helical columnar polymeric complexes with selective homochirality have been achieved from side-chain discotic liquid crystalline polymers doped with chiral acceptors.
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Affiliation(s)
- Bin Mu
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education
- Collaborative Innovation Center of Chemistry for Life Sciences
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Qian Li
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education
- Collaborative Innovation Center of Chemistry for Life Sciences
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Xiao Li
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education
- Collaborative Innovation Center of Chemistry for Life Sciences
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Jian Chen
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education
- Collaborative Innovation Center of Chemistry for Life Sciences
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- Nanjing University
| | - Jianglin Fang
- Center for Materials Analysis
- Nanjing University
- Nanjing 210093
- China
| | - Dongzhong Chen
- Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education
- Collaborative Innovation Center of Chemistry for Life Sciences
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- Nanjing University
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154
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Kim Y, Frigoli M, Vanthuyne N, Tamaoki N. A helical naphthopyran dopant for photoresponsive cholesteric liquid crystals. Chem Commun (Camb) 2017; 53:200-203. [DOI: 10.1039/c6cc08667e] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoisomerization of helical naphthopyran in cholesteric liquid crystals exhibited huge helical twisting power switching of over 90% resulting in significantly efficient rotational motion of micro-sized objects.
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Affiliation(s)
- Yuna Kim
- Research Institute for Electronic Science
- Hokkaido University
- Sapporo
- Japan
| | - Michel Frigoli
- UMR CNRS 8180
- UVSQ
- Institut Lavoisier de Versailles
- Université Paris-Saclay
- Versailles
| | | | - Nobuyuki Tamaoki
- Research Institute for Electronic Science
- Hokkaido University
- Sapporo
- Japan
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155
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Kokan Z, Perić B, Vazdar M, Marinić Ž, Vikić-Topić D, Meštrović E, Kirin SI. Metal-induced supramolecular chirality inversion of small self-assembled molecules in solution. Chem Commun (Camb) 2017; 53:1945-1948. [DOI: 10.1039/c6cc09203a] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example of supramolecular chirality inversion of small self-assembled ligands in solution by complexation to metal ions is presented.
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156
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Paikar A, Haldar D. Dynamic self-assembled polymer: HCl responsive inversion of supramolecular polymer handedness. RSC Adv 2017. [DOI: 10.1039/c7ra08035b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Discotic trisamide formed a self-assembled polymer and exhibits inversion of supramolecular polymer handedness in the presence of HCl.
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Affiliation(s)
- Arpita Paikar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- India
| | - Debasish Haldar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- India
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157
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van Leeuwen T, Heideman GH, Zhao D, Wezenberg SJ, Feringa BL. In situ control of polymer helicity with a non-covalently bound photoresponsive molecular motor dopant. Chem Commun (Camb) 2017; 53:6393-6396. [DOI: 10.1039/c7cc03188b] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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158
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Dhiman S, Jain A, George SJ. Transient Helicity: Fuel‐Driven Temporal Control over Conformational Switching in a Supramolecular Polymer. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610946] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shikha Dhiman
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Ankit Jain
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Subi J. George
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
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159
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Dhiman S, Jain A, George SJ. Transient Helicity: Fuel‐Driven Temporal Control over Conformational Switching in a Supramolecular Polymer. Angew Chem Int Ed Engl 2016; 56:1329-1333. [DOI: 10.1002/anie.201610946] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Shikha Dhiman
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Ankit Jain
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
| | - Subi J. George
- Supramolecular Chemistry Laboratory New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur Bangalore 560064 India
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160
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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: 407] [Impact Index Per Article: 50.9] [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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161
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Gao Y, Hao J, Wu J, Li Y, Lin Y, Hu J, Ju Y. Cooperative supramolecular helical assembly of a pyridinium-tailored methyl glycyrrhetate. SOFT MATTER 2016; 12:8979-8982. [PMID: 27774543 DOI: 10.1039/c6sm02142e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Taking a natural triterpenoid as the building block, we have regulated a pyridinium-functionalized methyl glycyrrhetate (C4-MGP) into P-type helices in water primarily driven by hydrophobic forces. By analysing their temperature-dependent CD and UV-Vis spectra, these hierarchical chiral assemblies were found to be formed in a cooperative supramolecular polymerization manner.
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Affiliation(s)
- Yuxia Gao
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Jie Hao
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Jindan Wu
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
| | - Ying Li
- College of Chemistry and Material Science, Shandong Agricultural University, Tai'an 271018, China
| | - Yuan Lin
- State Key Lab of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
| | - Jun Hu
- State Key Lab of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
| | - Yong Ju
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
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162
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Samanta A, Liu Z, Nalluri SKM, Zhang Y, Schatz GC, Stoddart JF. Supramolecular Double-Helix Formation by Diastereoisomeric Conformations of Configurationally Enantiomeric Macrocycles. J Am Chem Soc 2016; 138:14469-14480. [PMID: 27709916 DOI: 10.1021/jacs.6b09258] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Solid-state superstructures, resulting from assemblies programmed by homochirality, are attracting considerable attention. In addition, artificial double-helical architectures are being investigated, especially in relation to the ways in which homochiral small molecules can be induced to yield helical forms as a result of chiral induction. Herein, we report the highly specific self-assembly upon crystallization of a double-helical superstructure from an enantiopure macrocyclic dimer which adopts two diastereoisomeric conformations in a molar ratio of 1.5:1 in dimethyl sulfoxide. These two conformational diastereoisomers self-organize-and self-sort-in the crystalline phase in equimolar proportions to form two single-handed helices which are complementary to each other, giving rise to the assembly of a double helix that is stabilized by intermolecular [C-H···O] and π-π stacking interactions. The observed self-sorting phenomenon occurs on going from a mixed-solvent system containing two equilibrating conformational diastereoisomers, presumably present in unequal molar proportions, into the solid state. The diastereoisomeric conformations are captured upon crystallization in a 1:1 molar ratio in the double-helical superstructure, whose handedness is dictated by the choice of the enantiomeric macrocyclic dimer. The interconversion of the two conformational diastereoisomers derived from each configurationally enantiomeric macrocycle was investigated in CD3SOCD3 solution by variable-temperature 1H NMR spectroscopy (VT NMR) and circular dichroism (VT CD). The merging of the resonances for the protons corresponding to the two diastereoisomers at a range of coalescence temperatures in the VT NMR spectra and occurrence of the isosbestic points in the VT CD spectra indicate that the two diastereoisomers are interconverting slowly in solution on the 1H NMR time scale but rapidly on the laboratory time scale. To the best of our knowledge, the self-assembly of such solid-state superstructures from two conformational diastereoisomers of a homochiral macrocycle is a rare, if not unique, occurrence.
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Affiliation(s)
- Avik Samanta
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Zhichang Liu
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Siva Krishna Mohan Nalluri
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Yu Zhang
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - George C Schatz
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - J Fraser Stoddart
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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163
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Kumar J, Thomas KG, Liz-Marzán LM. Nanoscale chirality in metal and semiconductor nanoparticles. Chem Commun (Camb) 2016; 52:12555-12569. [PMID: 27752651 PMCID: PMC5317218 DOI: 10.1039/c6cc05613j] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 08/17/2016] [Indexed: 12/21/2022]
Abstract
The field of chirality has recently seen a rejuvenation due to the observation of chirality in inorganic nanomaterials. The advancements in understanding the origin of nanoscale chirality and the potential applications of chiroptical nanomaterials in the areas of optics, catalysis and biosensing, among others, have opened up new avenues toward new concepts and design of novel materials. In this article, we review the concept of nanoscale chirality in metal nanoclusters and semiconductor quantum dots, then focus on recent experimental and theoretical advances in chiral metal nanoparticles and plasmonic chirality. Selected examples of potential applications and an outlook on the research on chiral nanomaterials are additionally provided.
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Affiliation(s)
- Jatish Kumar
- CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain. and School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), CET Campus, Thiruvananthapuram, 695 016, India
| | - K George Thomas
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), CET Campus, Thiruvananthapuram, 695 016, India
| | - Luis M Liz-Marzán
- CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain. and Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
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164
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Ryabchun A, Raguzin I, Stumpe J, Shibaev V, Bobrovsky A. Cholesteric Polymer Scaffolds Filled with Azobenzene-Containing Nematic Mixture with Phototunable Optical Properties. ACS APPLIED MATERIALS & INTERFACES 2016; 8:27227-27235. [PMID: 27633069 DOI: 10.1021/acsami.6b09642] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The past two decades witnessed tremendous progress in the field of creation of different types of responsive materials. Cholesteric polymer networks present a very promising class of smart materials due to the combination of the unique optical properties of cholesteric mesophase and high mechanical properties of polymer networks. In the present work we demonstrate the possibility of fast and reversible photocontrol of the optical properties of cholesteric polymer networks. Several cholesteric photopolymerizable mixtures are prepared, and porous cholesteric network films with different helix pitches are produced by polymerization of these mixtures. An effective and simple method of the introduction of photochromic azobenzene-containing nematic mixture capable of isothermal photoinducing the nematic-isotropic phase transition into the porous polymer matrix is developed. It is found that cross-linking density and degree of polymer network filling with a photochromic nematic mixture strongly influence the photo-optical behavior of the obtained composite films. In particular, the densely cross-linked films are characterized by a decrease in selective light reflection bandwidth, whereas weakly cross-linked systems display two processes: the shift of selective light reflection peak and decrease of its width. It is noteworthy that the obtained cholesteric materials are shown to be very promising for the variety applications in optoelectronics and photonics.
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Affiliation(s)
- Alexander Ryabchun
- Fraunhofer Institute for Applied Polymer Research , Geiselbergstrasse 69, 14476 Potsdam-Golm, Germany
- Chemistry Department, Moscow State University , Lenin Hills 1, 119991 Moscow, Russia
| | - Ivan Raguzin
- Leibniz Institute of Polymer Research , Hohe Strasse 6, 01069 Dresden, Germany
| | - Joachim Stumpe
- University of Potsdam , Am Mühlenberg 11, 14476 Potsdam, Germany
| | - Valery Shibaev
- Chemistry Department, Moscow State University , Lenin Hills 1, 119991 Moscow, Russia
| | - Alexey Bobrovsky
- Chemistry Department, Moscow State University , Lenin Hills 1, 119991 Moscow, Russia
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165
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Gutierrez-Cuevas KG, Wang L, Zheng ZG, Bisoyi HK, Li G, Tan LS, Vaia RA, Li Q. Frequency-Driven Self-Organized Helical Superstructures Loaded with Mesogen-Grafted Silica Nanoparticles. Angew Chem Int Ed Engl 2016; 55:13090-13094. [PMID: 27633941 PMCID: PMC5540573 DOI: 10.1002/anie.201606895] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 08/09/2016] [Indexed: 11/08/2022]
Abstract
Adding colloidal nanoparticles into liquid-crystal media has become a promising pathway either to enhance or to introduce novel properties for improved device performance. Here we designed and synthesized new colloidal hybrid silica nanoparticles passivated with a mesogenic monolayer on the surface to facilitate their organo-solubility and compatibility in a liquid-crystal host. The resulting nanoparticles were identified by 1 H NMR spectroscopy, TEM, TGA, and UV/Vis techniques, and the hybrid nanoparticles were doped into a dual-frequency cholesteric liquid-crystal host to appraise both their compatibility with the host and the effect of the doping concentration on their electro-optical properties. Interestingly, the silica-nanoparticle-doped liquid-crystalline nanocomposites were found to be able to dynamically self-organize into a helical configuration and exhibit multi-stability, that is, homeotropic (transparent), focal conic (opaque), and planar states (partially transparent), depending on the frequency applied at sustained low voltage. Significantly, a higher contrast ratio between the transparent state and scattering state was accomplished in the nanoparticle-embedded liquid-crystal systems.
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Affiliation(s)
- Karla G Gutierrez-Cuevas
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH, 44242, USA
| | - Ling Wang
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH, 44242, USA
| | - Zhi-Gang Zheng
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH, 44242, USA
| | - Hari K Bisoyi
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH, 44242, USA
| | - Guoqiang Li
- Department of Ophthalmology and Visual Science and Department of Electrical and Computer Engineering, Ohio State University, Columbus, OH, 43212, USA
| | - Loon-Seng Tan
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH, 45433, USA
| | - Richard A Vaia
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH, 45433, USA
| | - Quan Li
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, OH, 44242, USA.
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166
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Gutierrez-Cuevas KG, Wang L, Zheng ZG, Bisoyi HK, Li G, Tan LS, Vaia RA, Li Q. Frequency-Driven Self-Organized Helical Superstructures Loaded with Mesogen-Grafted Silica Nanoparticles. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606895] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Karla G. Gutierrez-Cuevas
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
| | - Ling Wang
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
| | - Zhi-gang Zheng
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
| | - Hari K. Bisoyi
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
| | - Guoqiang Li
- Department of Ophthalmology and Visual Science and Department of Electrical and Computer Engineering; Ohio State University; Columbus OH 43212 USA
| | - Loon-Seng Tan
- Materials and Manufacturing Directorate; Air Force Research Laboratory; Wright-Patterson AFB OH 45433 USA
| | - Richard A. Vaia
- Materials and Manufacturing Directorate; Air Force Research Laboratory; Wright-Patterson AFB OH 45433 USA
| | - Quan Li
- Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent OH 44242 USA
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167
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Padmini V, Babu PN, Nair GG, Rao DSS, Yelamaggad CV. Optically Biaxial, Re-entrant and Frustrated Mesophases in Chiral, Non-symmetric Liquid Crystal Dimers and Binary Mixtures. Chem Asian J 2016; 11:2897-2910. [DOI: 10.1002/asia.201600918] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Vediappen Padmini
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
- Department of Organic Chemistry; School of Chemistry, Madurai Kamaraj University; Madurai 625021, Tamil Nadu India
| | - Palakurthy Nani Babu
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - Geetha G. Nair
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - D. S. Shankar Rao
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
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168
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Lv Z, Chen Z, Shao K, Qing G, Sun T. Stimuli-Directed Helical Chirality Inversion and Bio-Applications. Polymers (Basel) 2016; 8:polym8080310. [PMID: 30974585 PMCID: PMC6432277 DOI: 10.3390/polym8080310] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 08/09/2016] [Accepted: 08/12/2016] [Indexed: 12/21/2022] Open
Abstract
Helical structure is a sophisticated ubiquitous motif found in nature, in artificial polymers, and in supramolecular assemblies from microscopic to macroscopic points of view. Significant progress has been made in the synthesis and structural elucidation of helical polymers, nevertheless, a new direction for helical polymeric materials, is how to design smart systems with controllable helical chirality, and further use them to develop chiral functional materials and promote their applications in biology, biochemistry, medicine, and nanotechnology fields. This review summarizes the recent progress in the development of high-performance systems with tunable helical chirality on receiving external stimuli and discusses advances in their applications as drug delivery vesicles, sensors, molecular switches, and liquid crystals. Challenges and opportunities in this emerging area are also presented in the conclusion.
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Affiliation(s)
- Ziyu Lv
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Zhonghui Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Kenan Shao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Guangyan Qing
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Taolei Sun
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
- School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
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Xia Y, Lee E, Hu H, Gharbi MA, Beller DA, Fleischmann EK, Kamien RD, Zentel R, Yang S. Better Actuation Through Chemistry: Using Surface Coatings to Create Uniform Director Fields in Nematic Liquid Crystal Elastomers. ACS APPLIED MATERIALS & INTERFACES 2016; 8:12466-12472. [PMID: 27152975 DOI: 10.1021/acsami.6b02789] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Controlling the molecular alignment of liquid crystal monomers (LCMs) within nano- and microstructures is essential in manipulating the actuation behavior of nematic liquid crystal elastomers (NLCEs). Here, we study how to induce uniformly vertical alignment of nematic LCMs within a micropillar array to maximize the macroscopic shape change using surface chemistry. Landau-de Gennes numerical modeling suggests that it is difficult to perfectly align LCMs vertically in every pore within a poly(dimethylsiloxane) (PDMS) mold with porous channels during soft lithography. In an untreated PDMS mold that provides homeotropic anchoring of LCMs, a radially escaped configuration of LCMs is observed. Vertically aligned LCMs, a preferred configuration for actuation, are only observed when using a PDMS mold with planar anchoring. Guided by the numerical modeling, we coat the PDMS mold with a thin layer of poly(2-hydroxyethyl methacrylate) (PHEMA), leading to planar anchoring of LCM. Confirmed by polarized optical microscopy, we observe monodomains of vertically aligned LCMs within the mold, in agreement with modeling. After curing and peeling off the mold, the resulting NLCE micropillars showed a relatively large and reversible radial strain (∼30%) when heated above the nematic to isotropic transition temperature.
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Affiliation(s)
- Yu Xia
- Department of Materials Science and Engineering, University of Pennsylvania , 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - Elaine Lee
- Department of Materials Science and Engineering, University of Pennsylvania , 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
- Engineering Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | - Hao Hu
- Department of Materials Science and Engineering, University of Pennsylvania , 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - Mohamed Amine Gharbi
- Department of Materials Science and Engineering, University of Pennsylvania , 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
- Department of Physics and Astronomy, University of Pennsylvania , 209 South 33rd Street, Philadelphia, Pennsylvania 19104, United States
| | - Daniel A Beller
- Paulson School of Engineering and Applied Sciences, Harvard University , 29 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Eva-Kristina Fleischmann
- Institute of Organic Chemistry, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, 55128 Mainz, Germany
| | - Randall D Kamien
- Department of Physics and Astronomy, University of Pennsylvania , 209 South 33rd Street, Philadelphia, Pennsylvania 19104, United States
| | - Rudolf Zentel
- Institute of Organic Chemistry, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, 55128 Mainz, Germany
| | - Shu Yang
- Department of Materials Science and Engineering, University of Pennsylvania , 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
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