ISSN:
1572-9567
Keywords:
confinement
;
SFA
;
Surface Forces Aparatus
;
X-Ray Surface Forces Apparatus
;
XSFA
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01441895
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