2018 Impact factor 1.686
Soft Matter and Biological Physics


Eur. Phys. J. E 7, 23-29 (2002)
DOI: 10.1140/epje/i200101102

X-ray scattering study of the electric-field-induced layer deformations of an antiferroelectric Liquid Crystal

P. Cluzeau1, P. Barois2 and H. T. Nguyen2

1  Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UPRESA CNRS 8024, Bât. P5, UST Lille, 59655 Villeneuve d'Ascq, France
2  Centre de Recherche Paul Pascal, Avenue A. Schweitzer, 33600 Pessac, France

philippe.cluzeau@univ-lille1.fr

(Received 16 July 2001 and Received in final form 7 December 2001)

Abstract
The effect of an external electric field on the local layer structure is investigated in the $\chem{SmC^{*}_{A}}$, $\chem{SmC^{*}_{FI}}$ and $\chem{SmC^{*}}$ phases using X-ray diffraction. X-ray scattering and spontaneous polarization measurements are performed under several increasing (and decreasing) steps of AC applied voltage. The effects of the electric field differ significantly from one phase to the other. The chevron-to-bookshelf transition occurs abruptly at a high field value in the $\chem{SmC^{*}_{A}}$ phase whereas layer deformations are more progressive and occur at lower field values in the other phases. Comparison of the different behaviours suggests that the destruction of the chevron structure is mainly affected by the local molecular order.

PACS
61.10.Eq - X-ray scattering (including small-angle scattering).
61.30.Hn - Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions.


© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2002