Atomic force microscope based method of measuring short cholesteric pitch in liquid crystals

Škarabot, Miha; Lokar, Žiga; Gabrijelčič, Katja; Wilkes, David; Muševič, Igor

doi:10.1080/02678292.2011.589912

Cited by 24 publications

(8 citation statements)

References 4 publications

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“…The control parameter is h/p, where h is the pore width and p the cholesteric pitch; this parameter dictates the number of cholesteric periods or helix index in the cell, and its variation will induce transitions between cholesteric slabs of different numbers of half-turns of the director (winding transitions). As in the AFM experiments [35], an infinite collection of winding transitions are obtained. Using the chiral Lebwohl-Lasher model, we analyse these transitions in detail, locate the capillary isotropic-cholesteric phase transition as a function of the pore width, and establish the connection between this transition and the winding transitions, a relationship that previous studies have not addressed.…”

Section: Introductionmentioning

confidence: 99%

“…nematization transitions [34] and, more recently, even to obtain the pitch in cholesteric materials with high accuracy [35]. The control parameter is h/p, where h is the pore width and p the cholesteric pitch; this parameter dictates the number of cholesteric periods or helix index in the cell, and its variation will induce transitions between cholesteric slabs of different numbers of half-turns of the director (winding transitions).…”

Section: Introductionmentioning

confidence: 99%

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Capillary and winding transitions in a confined cholesteric liquid crystal

2015

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We consider a Lebwohl-Lasher model of chiral particles confined in a planar cell (slit pore) with different boundary conditions, and solve it using mean-field theory. The phase behaviour of the system with respect to temperature and pore width is studied. Two phenomena are observed: (i) an isotropic-cholesteric transition which exhibits an oscillatory structure with respect to pore width, and (ii) an infinite set of winding transitions caused by commensuration effects between cholesteric pitch and pore width. The latter transitions have been predicted and analysed by other authors for cholesterics confined in a fixed pore and subject to an external field promoting the uniaxial nematic phase; here we induce winding transitions solely from geometry by changing the pore width at zero external field (a setup recently explored in Atomic-Force Microscopy experiments). In contrast with previous studies, we obtain the phase diagram in the temperature vs pore width plane, including the isotropic-cholesteric transition, the winding transitions and their complex relationship. In particular, the structure of winding transitions terminates at the capillary isotropic-cholesteric transition via triple points where the confined isotropic phase coexists with two cholesterics with different helix indices. For symmetric and asymmetric monostable plate anchorings the phase diagram are qualitatively similar.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capillary and winding transitions in a confined cholesteric liquid crystal

2015

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“…[2][3][4][5] The first four winners of the Prize are listed in Table 1, and these have described quite different areas of liquid crystal science. [6][7][8][9] The challenge of selecting the best paper from almost 200 papers published in 2013 was a particularly demanding one. The exhaustive selection process begins with the referees who, as part of the reviewing process, can flag a paper as a worthy prizewinner.…”

Section: Editorial the 2013 Luckhurst-samulski Prizementioning

confidence: 99%

The 2013 Luckhurst-Samulski Prize

Imrie

2014

Liquid Crystals

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“…I am delighted to report that the 2011 LuckhurstSamulski Prize has been awarded to Igor Muševič and his colleagues for their paper entitled Atomic force microscope-based method of measuring short cholesteric pitch in liquid crystals [7].…”

Section: Editorial the 2011 Luckhurst-samulski Prizementioning

confidence: 99%

The 2011Luckhurst–Samulski Prize

Imrie

2012

Liquid Crystals

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Atomic force microscope based method of measuring short cholesteric pitch in liquid crystals

Cited by 24 publications

References 4 publications

Capillary and winding transitions in a confined cholesteric liquid crystal

Capillary and winding transitions in a confined cholesteric liquid crystal

The 2013 Luckhurst-Samulski Prize

The 2011Luckhurst–Samulski Prize

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