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Photo-Orientation of Liquid Crystals on Azo Dye-Containing Polymers. Polymers (Basel) 2021; 14:polym14010159. [PMID: 35012181 PMCID: PMC8747469 DOI: 10.3390/polym14010159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 12/28/2021] [Accepted: 12/29/2021] [Indexed: 11/18/2022] Open
Abstract
In this communication, we summarise our results related to light-induced orientational phenomena at liquid crystal–polymer interfaces. We investigated photoalignment for various nematics at the interface with the photosensitive polymer layer polymethyl methacrilate functionalised with azo dye Disperse Red 1. It was found that the efficiency of photoalignment exhibits marked differences depending on the structure of the rigid core of the liquid crystal molecules. It was demonstrated that the photo-orientation process is also significantly affected by the type of mesophase in which irradiation is carried out. The observations highlight the importance of the mutual influence of the polymer and the liquid crystal in light-induced processes.
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Nassrah ARK, Jánossy I, Kenderesi V, Tóth-Katona T. Polymer-Nematic Liquid Crystal Interface: On the Role of the Liquid Crystalline Molecular Structure and the Phase Sequence in Photoalignment. Polymers (Basel) 2021; 13:E193. [PMID: 33430256 PMCID: PMC7825733 DOI: 10.3390/polym13020193] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/02/2021] [Accepted: 01/04/2021] [Indexed: 11/16/2022] Open
Abstract
We provide experimental evidence for the influence of the molecular structure of the nematic liquid crystal (NLC) on the photoalignment process in three dimensions at the interface with a polymer layer. In particular, the experimental findings are explained through the presence (or absence) of the π-π aromatic interactions between the NLC and the polymer. The influence of the nematic-to-smectic A phase transition on the photocontrol is also addressed. Furthermore, we demonstrate that the photo-induced reorientation scenarios can be eventually connected to conformational changes in the photosensitive polymer.
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Affiliation(s)
| | | | | | - Tibor Tóth-Katona
- Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary; (A.R.K.N.); (I.J.); (V.K.)
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Nassrah AR, Jánossy I, Tóth-Katona T. Photoalignment at the nematic liquid crystal–polymer interface: The importance of the liquid crystalline molecular structure. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Ordikhani Seyedlar A, Martins JPDA, Sebastião PJ, Jardim Beira MJ, Stapf S, Vaca Chávez F, Mattea C. Dynamics of binary mixtures of an ionic liquid and ethanol by NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:108-112. [PMID: 28568740 DOI: 10.1002/mrc.4620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/22/2017] [Accepted: 05/26/2017] [Indexed: 06/07/2023]
Abstract
A study of molecular dynamics of the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoro-methylsulphonyl)imide ([Emim][Tf2N]) in solution with deuterated ethanol at different molar concentration and temperatures is presented. The study was performed using 1 H and 2 H nuclear magnetic relaxation and 2 H 1D spectroscopy. The temperature dependence of the spin-lattice relaxation time T1 of the cations allows the evaluation of the activation energies of the rotational degree of freedom of these molecules. The viscosity in the binary system increases with the concentration of ionic liquid. However, the activation energy in the cation molecules decreases when the concentration of the ionic liquid increases, indicating that the rotational dynamics is facilitated. This behavior is explained from the fact that the presence of the ionic liquid in the system disrupts the degree of intermediate range order expected in the alcohol system. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Amin Ordikhani Seyedlar
- Department of Technical Physics II/Polymer Physics, Institute of Physics, Ilmenau University of Technology, Ilmenau, D-98684, Germany
| | - João Pedro de Almeida Martins
- Centre of Physics and Engineering of Advanced Materials, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Pedro J Sebastião
- Centre of Physics and Engineering of Advanced Materials, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Maria José Jardim Beira
- Centre of Physics and Engineering of Advanced Materials, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Siegfried Stapf
- Department of Technical Physics II/Polymer Physics, Institute of Physics, Ilmenau University of Technology, Ilmenau, D-98684, Germany
| | - Fabián Vaca Chávez
- FAMAF - Universidad Nacional de Córdoba & IFEG-CONICET, Córdoba, Argentina
| | - Carlos Mattea
- Department of Technical Physics II/Polymer Physics, Institute of Physics, Ilmenau University of Technology, Ilmenau, D-98684, Germany
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5
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Ruivo D, Canongia Lopes JN, Deive FJ, Esperança JMSS, Rebelo LPN, Rodriguez A, Shimizu K. Molecular dynamics studies on the structure and interactions of ionic liquids containing amino-acid anions. Phys Chem Chem Phys 2018; 20:23864-23872. [DOI: 10.1039/c8cp03831g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several molecular dynamics (MD) simulations have been performed in order to obtain structural information on ionic liquids (ILs) based on amino-acid anions.
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Affiliation(s)
- Diana Ruivo
- LAQV
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
| | - José N. Canongia Lopes
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
| | | | - José M. S. S. Esperança
- LAQV
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
| | - Luís Paulo N. Rebelo
- LAQV
- REQUIMTE
- Departamento de Química
- Faculdade de Ciências e Tecnologia
- Universidade Nova de Lisboa
| | - Ana Rodriguez
- Department of Chemical Engineering
- University of Vigo
- 36310 Vigo
- Spain
| | - Karina Shimizu
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
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6
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Janssen CH, Macías-Ruvalcaba NA, Aguilar-Martínez M, Kobrak MN. Metal extraction to ionic liquids: the relationship between structure, mechanism and application. INT REV PHYS CHEM 2015. [DOI: 10.1080/0144235x.2015.1088217] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Camiel H.C. Janssen
- Facultad de Química, Universidad Nacional Autónoma de México. Ciudad Universitaria, C.P. 04510 México D.F., México
| | - Norma A. Macías-Ruvalcaba
- Facultad de Química, Universidad Nacional Autónoma de México. Ciudad Universitaria, C.P. 04510 México D.F., México
| | - Martha Aguilar-Martínez
- Facultad de Química, Universidad Nacional Autónoma de México. Ciudad Universitaria, C.P. 04510 México D.F., México
| | - Mark N. Kobrak
- Department of Chemistry, Brooklyn College of the City University of New York, 2900 Bedford Ave., Brooklyn, NY 11210, USA
- Department of Chemistry, Graduate Center of the City University of New York, 365 Fifth Ave., New York, NY 10016, USA
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7
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Affiliation(s)
- Robert Hayes
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, NSW 2006, Sydney, Australia
| | - Rob Atkin
- Discipline
of Chemistry, The University of Newcastle, NSW 2308, Callaghan, Australia
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8
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Pavez P, Millán D, Cocq C, Santos JG, Nome F. Ionic liquids: anion effect on the reaction of O,O-diethyl O-(2,4-dinitrophenyl) phosphate triester with piperidine. NEW J CHEM 2015. [DOI: 10.1039/c4nj02121e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ionic liquids can be considered as designer solvents in the titled reaction because by an appropriate choice of the anion it is possible to steer the selectivity of this reaction.
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Affiliation(s)
- Paulina Pavez
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Daniela Millán
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Cristian Cocq
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - José G. Santos
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Santiago 6094411
- Chile
| | - Faruk Nome
- INCT-Catálise, Departamento de Química
- Universidade Federal de Santa Catarina
- Florianópolis
- Brasil
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Dias N, Shimizu K, Morgado P, Filipe EJM, Canongia Lopes JN, Vaca Chávez F. Charge Templates in Aromatic Plus Ionic Liquid Systems Revisited: NMR Experiments and Molecular Dynamics Simulations. J Phys Chem B 2014; 118:5772-80. [DOI: 10.1021/jp503130y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nuno Dias
- Departamento
de Física, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Karina Shimizu
- Centro
de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Pedro Morgado
- Centro
de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Eduardo J. M. Filipe
- Centro
de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - José N. Canongia Lopes
- Centro
de Química Estrutural (CQE), Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Fabián Vaca Chávez
- Centro
de Física da Matéria Condensada (CFMC), Universidade de Lisboa, 1649-004 Lisboa, Portugal
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