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Hayward DW, Magro G, Hörmann A, Prévost S, Schweins R, Richardson RM, Gradzielski M. A temperature-controlled electric field sample environment for small-angle neutron scattering experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:033903. [PMID: 33820030 DOI: 10.1063/5.0040675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/16/2021] [Indexed: 06/12/2023]
Abstract
A new sample environment is introduced for the study of soft matter samples in electric fields using small-angle neutron scattering instruments. The sample environment is temperature controlled and features external electrodes, allowing standard quartz cuvettes to be used and conducting samples or samples containing ions to be investigated without the risk of electrochemical reactions occurring at the electrodes. For standard 12.5 mm quartz cuvettes, the maximum applied field is 8 kV/cm, and the applied field may be static or alternating (up to 10 kHz for 8 kV/cm and up to 60 kHz for 4 kV/cm). The electric fields within the sample are calculated and simulated under a number of different conditions, and the capabilities of the setup are demonstrated using a variety of liquid crystalline samples. Measurements were performed as a function of temperature and time spent in the electric field. Finally, the advantages, drawbacks, and potential optimization of the sample environment are discussed with reference to applications in the fields of complex soft matter, biology, and electrorheology.
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Affiliation(s)
- Dominic W Hayward
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straβe des 17. Juni 124, D-10623 Berlin, Germany
| | - Germinal Magro
- School of Physics, University of Bristol, Tyndall Avenue, BS8 1TL Bristol, United Kingdom
| | - Anja Hörmann
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straβe des 17. Juni 124, D-10623 Berlin, Germany
| | - Sylvain Prévost
- Institut Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble Cedex 9, France
| | - Ralf Schweins
- Institut Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble Cedex 9, France
| | - Robert M Richardson
- School of Physics, University of Bristol, Tyndall Avenue, BS8 1TL Bristol, United Kingdom
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straβe des 17. Juni 124, D-10623 Berlin, Germany
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Cerbelaud M, Lebdioua K, Tran CT, Crespin B, Aimable A, Videcoq A. Brownian dynamics simulations of one-patch inverse patchy particles. Phys Chem Chem Phys 2019; 21:23447-23458. [PMID: 31616876 DOI: 10.1039/c9cp04247d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Inverse patchy particles are promising colloids to develop new architectures in ceramic materials based on their self-assembly. Nonetheless, a good understanding of their aggregation is required. Several previous studies have shown that the behavior of ceramic colloids can be well described by the DLVO interaction potential. In the present paper, we develop new coarse-grained Brownian dynamics simulations, where particles are represented by an assembly of beads interacting via DLVO interactions, whose parameters can be directly linked to experimental characterization. First, the validity of the simulations is proved by studying the heteroaggregation of homogeneously charged particles. Then, simulations are applied to one-patch inverse patchy particles to study the effect of the patch size. They show that the smaller the patch, the more elongated the aggregates. Simulations are also performed to understand the role of the Debye screening length in the particular case of large patches and they show that aggregation leads always to compact aggregates.
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Buluy O, Aryasova N, Tereshchenko O, Kurioz Y, Nazarenko V, Eremin A, Stannarius R, Klein S, Goldmann C, Davidson P, Dozov I, Reznikov Y. Optical and X-ray scattering studies of the electric field-induced orientational order in colloidal suspensions of pigment nanorods. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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May K, Stannarius R, Kang K, Challa PK, Sprunt S, Jákli A, Klein S, Eremin A. Collective dynamics in dispersions of anisometric pigment particles. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hayward DW, Lunn DJ, Seddon A, Finnegan JR, Gould OEC, Magdysyuk O, Manners I, Whittell GR, Richardson RM. Structure of the Crystalline Core of Fiber-like Polythiophene Block Copolymer Micelles. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02552] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | | | | | | | | | - Oxana Magdysyuk
- Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K
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Kredentser S, Eremin A, Davidson P, Reshetnyak V, Stannarius R, Reznikov Y. Light-induced Soret effect and adsorption of nanocrystals in organic solvents. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:38. [PMID: 27021655 DOI: 10.1140/epje/i2016-16038-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 01/21/2016] [Indexed: 06/05/2023]
Abstract
A light-induced Soret effect accompanied by photoinduced adsorption of pigment nanoparticles is described in organic solvents. We report an unexpected inversion of the nanoparticle flux which is directed along the temperarture gradient at short exposures to the light and switches against the gradient at longer exposures. This change of flux direction is due to light-induced adsorption of the nanocrystals onto the substrates of the cell.
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Affiliation(s)
- S Kredentser
- Institute of Physics of National Academy of Sciences of Ukraine, Pr. Nauky 46, 03028, Kyiv, Ukraine.
| | - A Eremin
- Otto-von-Guericke-Universität Magdeburg, 4120, Magdeburg, Germany
| | - P Davidson
- Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, 91405, Orsay, France
| | - V Reshetnyak
- Taras Shevchenko National University of Kyiv, 01601, Kyiv, Ukraine
| | - R Stannarius
- Otto-von-Guericke-Universität Magdeburg, 4120, Magdeburg, Germany
| | - Yu Reznikov
- Institute of Physics of National Academy of Sciences of Ukraine, Pr. Nauky 46, 03028, Kyiv, Ukraine
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Eremin A, Geng Y, Stannarius R, Ostapenko T, Challa PK, Gleeson JT, Jákli A, Klein S. Peculiarities of the magneto-optical response in dispersions of anisometric pigment nano-particles. RSC Adv 2016. [DOI: 10.1039/c6ra12020b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We demonstrate an unusually strong magneto-optical response of elongated plate-shaped pigment particles in magnetic fields ranging from 0 to 25 T.
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Affiliation(s)
- A. Eremin
- Otto-von-Guericke-Universität Magdeburg
- FNW/IEP/ANP
- 39016 Magdeburg
- Germany
| | - Y. Geng
- Otto-von-Guericke-Universität Magdeburg
- FNW/IEP/ANP
- 39016 Magdeburg
- Germany
| | - R. Stannarius
- Otto-von-Guericke-Universität Magdeburg
- FNW/IEP/ANP
- 39016 Magdeburg
- Germany
| | - T. Ostapenko
- Max Planck Institute for Dynamics and Self-Organization (MPIDS)
- 37077 Göttingen
- Germany
| | - P. K. Challa
- Department of Physics
- Kent State University
- Kent
- USA
| | | | - A. Jákli
- Liquid Crystal Institute
- Kent State University
- Kent
- USA
| | - S. Klein
- HP Laboratories
- Bristol BS34 8QZ
- UK
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Hayward DW, Gilroy JB, Rupar PA, Chabanne L, Pizzey C, Winnik MA, Whittell GR, Manners I, Richardson RM. Liquid Crystalline Phase Behavior of Well-Defined Cylindrical Block Copolymer Micelles Using Synchrotron Small-Angle X-ray Scattering. Macromolecules 2015. [DOI: 10.1021/ma502222f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Dominic W. Hayward
- H.H.
Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, U.K
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Bristol
Centre for Functional Nanomaterials, University of Bristol, Bristol BS8 1TH, U.K
| | - Joe B. Gilroy
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Paul A. Rupar
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Laurent Chabanne
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Claire Pizzey
- Diamond Light Source, Harwell Science & Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K
| | - Mitchell A. Winnik
- Department
of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - George R. Whittell
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Ian Manners
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
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Optically driven translational and rotational motions of microrod particles in a nematic liquid crystal. Proc Natl Acad Sci U S A 2015; 112:1716-20. [PMID: 25624507 DOI: 10.1073/pnas.1419850112] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A small amount of azo-dendrimer molecules dissolved in a liquid crystal enables translational and rotational motions of microrods in a liquid crystal matrix under unpolarized UV light irradiation. This motion is initiated by a light-induced trans-to-cis conformational change of the dendrimer adsorbed at the rod surface and the associated director reorientation. The bending direction of the cis conformers is not random but is selectively chosen due to the curved local director field in the vicinity of the dendrimer-coated surface. Different types of director distortions occur around the rods, depending on their orientations with respect to the nematic director field. This leads to different types of motions driven by the torques exerted on the particles by the director reorientations.
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May K, Stannarius R, Klein S, Eremin A. Electric-field-induced phase separation and homogenization dynamics in colloidal suspensions of dichroic rod-shaped pigment particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7070-7076. [PMID: 24866927 DOI: 10.1021/la501120k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a reversible phase separation phenomenon in nonpolar colloidal suspensions of rod-shaped dichroic pigment particles in an electric field. The voltage-frequency phase diagram features a variety of phases with different morphologies. Single static particle-rich islands, chains of islands, and dynamic patterns were found in this system. We demonstrate that those patterns exhibit complex relaxation dynamics toward the homogeneous field-free state once the external field is removed.
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Affiliation(s)
- Kathrin May
- Otto von Guericke University , Institute for Experimental Physics, Department for Nonlinear Phenomena, 39106 Magdeburg, Germany
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May K, Eremin A, Stannarius R, Klein S, Neyts K, Harden J, Jákli A. Piezoelectric fiber mats containing polar rod-shaped pigment particles. RSC Adv 2014. [DOI: 10.1039/c4ra05696e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We prepared electrospun polylactic acid (PLA) fiber mats containing anisometric pigment nanoparticles and demonstrate their converse piezoelectric behavior.
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Affiliation(s)
- Kathrin May
- Otto-von-Guericke-Universität Magdeburg
- 39016 Magdeburg, Germany
| | - Alexey Eremin
- Otto-von-Guericke-Universität Magdeburg
- 39016 Magdeburg, Germany
| | - Ralf Stannarius
- Otto-von-Guericke-Universität Magdeburg
- 39016 Magdeburg, Germany
| | | | - Kristiaan Neyts
- Liquid Crystals and Photonics Group
- ELIS Department
- Ghent University
- 9000 Ghent, Belgium
| | - John Harden
- Liquid Crystal Institute
- Kent State University
- Kent, USA
| | - Antal Jákli
- Liquid Crystal Institute
- Kent State University
- Kent, USA
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Klein S, Raynes P, Sambles R. New frontiers in anisotropic fluid-particle composites. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2013; 371:20120510. [PMID: 23459969 PMCID: PMC3638374 DOI: 10.1098/rsta.2012.0510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Susanne Klein
- HP Laboratories, Long Down Avenue, Stoke Gifford, Bristol BS34 8QZ, UK.
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