Free volume, molecular grains, self-organisation, and anisotropic entropy: machining materials

Mirror symmetry breaking in liquids and liquid crystals

“…Also for main chain polymers a N-N X transition was actually observed much earlier [162], and later attributed to a N-N TB transition [155]. This field has in the meanwhile spread out and developed to a prosperous new field of LC research conducted by several groups [163][164][165][166][167][168][169][170][171][172][173] and comprehensively reviews have appeared [163,[174][175][176][177][178]; here we focus the discussion on some chirality related issues.…”

“…Synthetic work has shown that N TB phase formation is not restricted to mesogenic dimers with different types of odd-numbered aliphatic spacers (for example compounds 7-11 in Figure 14) [163,175,177,179], but is also found for bent core molecules 12 [165,180], mesogenic trimers [171,175] involving rod-like or mixtures of rod-like and bent core mesogens [181], higher oligomers [174,182] and main chain polymers [155,162], as well as for hydrogen bonded oligomesogen aggregates [183]. Although symmetric and unsymmetric di-and oligomesogens with different linking groups are known to exhibit the N TB phase, the symmetrical compounds with methylene spacers are the most commonly encountered and most detailed investigated materials [184].…”

“…N TB phase forming compounds. Selected examples of cyanobiphenyl based mesogenic dimers 7-11 with calculated bending angles[177] and formula of the bent-core molecule 12.…”

The 2017 Luckhurst-Samulski Prize

“…The second of the highly rated list is by John Goodby and has the enigmatic title Free volume, molecular grains, self-organisation, and anisotropic entropy [15]. The contents of this article are just as intriguing as its title since they are related to a diverse range of topics concerned with the twist-bend phase.…”

Theoretical Model of a Nematogen: Estimation of Phase Stability, Absorption, Electrochemical, and Nonlinear Optical Properties

“…Further, the analysis of the electronic excited states of mesogenic molecules may also have some interest for the study of LC behaviour. In fact, the orientation-dependent part of the dispersive intermolecular forces, which also contribute to the stabilization of the LC phase, particularly of the long range orientational order of nematics, depends on the spatial anisotropy of molecular transition moments from fundamental to excited electronic states (molecular anisotropy factor) [8].…”