On the creation of director disorder in nematic liquid crystals

Luckhurst, G. R.

doi:10.1016/j.tsf.2005.09.117

Cited by 21 publications

(21 citation statements)

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“…EPR of spin probes has been used to test structural properties and molecular mobility of numerous complex molecular systems such as proteins and protein-protein complexes, DNA or RNA, polymers, lipids, nanostructures, monolayers at oil-water interfaces, and also liquid crystals (LC) [2][3][4][5][6][7][8][9][10].…”

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confidence: 99%

Electron Paramagnetic Resonance Spectra Simulation Directly from Molecular Dynamics Trajectories of a Liquid Crystal with a Doped Paramagnetic Spin Probe

et al. 2009

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'Electron paramagnetic resonance spectra simulation directly from molecular dynamics trajectories of a liquid crystal with a doped paramagnetic spin probe.', Physical review letters., 102 (1). 013005. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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confidence: 99%

Electron Paramagnetic Resonance Spectra Simulation Directly from Molecular Dynamics Trajectories of a Liquid Crystal with a Doped Paramagnetic Spin Probe

et al. 2009

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“…[11][12][13][14] Whereas ESR spectra of spin probes in polymers [15][16][17][18][19][20][21][22] and liquid crystals [23][24][25][26][27][28][29] have been extensively investigated, only a few works have been devoted to the spin probe studies of LC polymers. [30][31][32][33][34] The spin probe studies of soft materials show convincingly that for well-founded characterization of rotation mobility [35][36][37][38][39][40] and orientation order 23,26,36,[41][42][43] of these systems, the quantitative numerical simulation of ESR spectra is necessary. 9,44 It has been shown that for obtaining unbiased and reliable results, the joint simulation of series of ESR spectra recorded at different temperatures, 45 and (for anisotropic samples) at different sample orientations with respect to the spectrometer magnetic field, 25,46 should be performed.…”

Section: Introductionmentioning

confidence: 99%

The orientation order of liquid‐crystalline polymer, measured by ESR and optical dichroism techniques

Bogdanov

Bobrovsky

Vorobiev

2019

J Polym Sci B Polym Phys

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Molecular orientation order and rotation mobility of comb‐shaped liquid crystalline polymer forming nematic and smectic mesophases are characterized by spin probe and dichroism technique in the temperature range 100–420 K. The models describing the mechanism of molecular rotations in different temperature ranges were determined by quantitative numerical simulations of ESR spectra. In the vicinity of the glass transition point of the polymer, where the fast amplitude‐restricted molecular reorientations take place, the quasi‐libration model was found to be adequate for the description of ESR spectra, while the often used Brownian rotational diffusion is appropriate at higher temperatures only. Orientation distribution function of probe molecules was characterized quantitatively by order parameters up to sixth rank for a wide temperature range. The orientation order parameters measured via the spin probe technique are shown to correlate with orientation order parameters measured by optical techniques. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 819–825

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“…[1][2][3][4][5][6][7][8] This includes proteins and protein-protein complexes, 4,5,[9][10][11][12][13][14][15][16] DNA/RNA, [17][18][19] protein-DNA complexes, 20 polymers, 21 phospholipid membranes, [22][23][24][25][26][27] liquid crystals, [28][29][30] nanostructures and nano-sized particles. 31,32 The nitroxide radical, (N-O), incorporated into a 5 or 6 membered heterocyclic ring and sterically protected by pairs of gem methyl groups is relatively stable chemically and can be covalently attached to molecules to form spin labels and probes.…”

Section: Introductionmentioning

confidence: 99%

“…As has been demonstrated, EPR spectra can be rich in information about the state of molecules in different phases and across phase transition regions. 22,23,26,[28][29][30]37 Although motional EPR spectra are potentially highly informative, experimental spectra require careful analysis in order to extract and differentiate between different motional and ordering contributions. Arrows indicate three frames, namely, the magnetic axes of the nitroxide head group (the z axis is coincident with the direction of p z -orbital of N and the x axis runs along the N-O bond), a backbone fixed frame (X,Y,Z) and a frame associated with the global tumbling of the protein defined by the principle axes of the inertia tensor (X',Y',Z').…”

Section: Introductionmentioning

confidence: 99%