Impact of Weak Nanoparticle Induced Disorder on Nematic Ordering
AbstractDilute mixtures of nanoparticles (NPs) and nematic liquid crystals (LCs) are considered. We focus on cases where NPs enforce a relatively weak disorder to the LC host. We use a Lebwohl-Lasher semi-microscopic-type modeling where we assume that NPs effectively act as a spatially-dependent external field on nematic spins. The orientational distribution of locally favoured “easy” orientations is described by a probabilistic distribution function P. By means of a mean field-type approach, we derive a self-consistent equation for the average degree of nematic uniaxial order parameter S as a function of the concentration p of NPs, NP-LC coupling strength and P. Using a simple step-like probability distribution shape, we obtain the S(p) dependence displaying a crossover behaviour between two different regimes which is in line with recent experimental observations. We also discuss a possible origin of commonly observed non-monotonous variations of the nematic-isotropic phase temperature coexistence width on varying p. View Full-Text
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Črešnar, D.; Kyrou, C.; Lelidis, I.; Drozd-Rzoska, A.; Starzonek, S.; Rzoska, S.J.; Kutnjak, Z.; Kralj, S. Impact of Weak Nanoparticle Induced Disorder on Nematic Ordering. Crystals 2019, 9, 171.
Črešnar D, Kyrou C, Lelidis I, Drozd-Rzoska A, Starzonek S, Rzoska SJ, Kutnjak Z, Kralj S. Impact of Weak Nanoparticle Induced Disorder on Nematic Ordering. Crystals. 2019; 9(3):171.Chicago/Turabian Style
Črešnar, Dejvid; Kyrou, Christina; Lelidis, Ioannis; Drozd-Rzoska, Aleksandra; Starzonek, Szymon; Rzoska, Sylwester J.; Kutnjak, Zdravko; Kralj, Samo. 2019. "Impact of Weak Nanoparticle Induced Disorder on Nematic Ordering." Crystals 9, no. 3: 171.
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