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Study of flow in a smectic liquid crystal in the X-ray Surface Forces Apparatus (1995)

Idziak, S. H. J. ; Koltover, I. ; Liang, K. S. ; [weitere]

Springer

International journal of thermophysics 16 (1995), S. 299-307

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Details

ISSN: 1572-9567

Schlagwort(e): confinement ; SFA ; Surface Forces Aparatus ; X-Ray Surface Forces Apparatus ; XSFA

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We describe the newly invented X-Ray Surface Forces Apparatus (X-SFA) which allows the simultaneous measurement of forces and collective structures of confined complex fluids under static and flow conditions. The structure of the smectic liquid crystal 8CB (4-cyano-4′-octylbiphenyl) f confined between two mica surfaces with separation ranging from 4000 to 20,000 A was measured. At small gaps and no shear, the smectic layers take on distinct stable orientations, including the bulk forbidden “h” orientation. which persist under low shear ( $$\dot \gamma $$ ⩽ 30 s−1). However, at higher shear rates $$\dot \gamma $$ ⩽ 360 s−1) the shear acts to dramatically order and align the smectic layers into a single“a” orientation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01441895

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