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Titolo:
Alignment of hexatic Langmuir monolayers under shear
Autore:
Ignes-Mullol, J; Schwartz, DK;
Indirizzi:
Tulane Univ, Dept Chem, New Orleans, LA 70118 USA Tulane Univ New OrleansLA USA 70118 Dept Chem, New Orleans, LA 70118 USA
Titolo Testata:
PHYSICAL REVIEW LETTERS
fascicolo: 7, volume: 85, anno: 2000,
pagine: 1476 - 1479
SICI:
0031-9007(20000814)85:7<1476:AOHLMU>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
FATTY-ACID MONOLAYER; AIR-WATER-INTERFACE; X-RAY-DIFFRACTION; BREWSTER-ANGLE; DIRECT VISUALIZATION; PHASE-TRANSITIONS; FLOW; ORIENTATION; MICROSCOPE; MEDIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Ignes-Mullol, J Tulane Univ, Dept Chem, New Orleans, LA 70118 USA Tulane Univ New Orleans LA USA 70118 rleans, LA 70118 USA
Citazione:
J. Ignes-Mullol e D.K. Schwartz, "Alignment of hexatic Langmuir monolayers under shear", PHYS REV L, 85(7), 2000, pp. 1476-1479

Abstract

We have studied the structural changes that fatty acid monolayers in the Ov phase undergo when a simple shear flow is imposed. A strong coupling is revealed by the changes in domain structure that are observable using Brewster angle microscopy, suggesting the possibility of shear alignment. The dependence of the alignment on the molecular polar tilt proves that the mechanism is different than in nematic liquid crystals. We argue that the degenerate lattice symmetry lines of the underlying pseudohexagonal lattice align in the flow direction, and we explain the observed alignment angle using geometrical arguments.

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Documento generato il 31/03/20 alle ore 16:32:46