C
Ch. Legrand
Researcher at University of the Littoral Opal Coast
Publications - 14
Citations - 81
Ch. Legrand is an academic researcher from University of the Littoral Opal Coast. The author has contributed to research in topics: Dielectric & Dielectric spectroscopy. The author has an hindex of 6, co-authored 14 publications receiving 79 citations.
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Phase behaviour and dynamics of exemplary MHPOBC analogue
TL;DR: In this paper, the authors studied the phase polymorphism of 4-(1-methylheptyloxycarbonyl)phenyl-4-nonylbiphenyl- 4-carboxylate (MHPNBC) analogues and found that in addition to the para-, ferro- and antiferroelectric phases it exhibits three sub-phases (two ferri- and alpha sub-phase) and a highly ordered room temperature phase.
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Complementary studies of de Vries type SmA* phase
A. Mikułko,Monika Marzec,S. Wróbel,J. Przedmojski,Redouane Douali,Ch. Legrand,Roman Dąbrowski,Wolfgang Haase +7 more
TL;DR: In this paper, two chiral liquid crystalline compounds have been investigated, namely 4-(1-methylheptyloxycarbonyl) phenyl-4′nonylbiphenyl- 4-carboxylate (MHPNBC), 3-(2-fluor-octyloxy)-6-(4octyl-phenyl) pyridine (FOOPP) to study the SmA ∗ -SmC ∗ transition.
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Ferroelectric properties of achiral banana-shaped and calamitic-chiral thioesters
D.M. Ossowska-Chruściel,K. Kudłacz,A. Sikorska,J. Chruściel,Monika Marzec,A. Mikułko,S. Wróbel,Redouane Douali,Ch. Legrand +8 more
TL;DR: In this article, two thioester compounds: (S)-(+)-4-(1-methylheptyloxy)biphenyl 4-hexyl-thiobenzoate (MHOBS7) and 1,3-phenylene bis{4-[(4-octyloxybenzoyl)-sulfanyl]benzoate} (in short: 8OSOR) built of banana like achiral molecules, have been studied by complementary methods to show differences in their linear dielectric as well as ferroelectric
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Ferroelectric behaviour of hexatic phases
S. Wróbel,A. Mikułko,Redouane Douali,Ch. Legrand,Monika Marzec,Wolfgang Haase,N. Isaert,M. Ismaili +7 more
TL;DR: In this article, two examples of hexatic phases have been presented to show that the highly ordered phases can be either the ferro- or antiferroelectric ones, and two kinds of smectic C*-hexatic transitions where the spontaneous polarisation changes either continuously or discontinuously in spite of the fact that from the thermodynamic standpoint both transitions are of the first order.
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Retardation of Molecular Relaxation in Highly Ordered Antiferroelectric Phase
TL;DR: In this paper, the authors used dielectric and DSC methods to study liquid crystalline compound MHPNBC exhibiting para-, ferro-, ferri-, antiferroelectric and a highly ordered antiferrous like phase.