Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2011-05-12
J. Phys.: Condens. Matter 23, 184109 (2011)
Physics
Condensed Matter
Soft Condensed Matter
18 pages, 8 figures
Scientific paper
10.1088/0953-8984/23/18/184109
We present, along with some fundamental concepts regarding imbibition of liquids in porous hosts, an experimental, gravimetric study on the capillarity-driven invasion dynamics of water and of the rod-like liquid crystal octyloxycyanobiphenyl (8OCB) in networks of pores a few nanometers across in monolithic silica glass (Vycor). We observe, in agreement with theoretical predictions, square root of time invasion dynamics and a sticky velocity boundary condition for both liquids investigated. Temperature-dependent spontaneous imbibition experiments on 8OCB reveal the existence of a paranematic phase due to the molecular alignment induced by the pore walls even at temperatures well beyond the clearing point. The ever present velocity gradient in the pores is likely to further enhance this ordering phenomenon and prevent any layering in molecular stacks, eventually resulting in a suppression of the smectic phase in favor of the nematic phase.
Gruener Simon
Huber Patrick
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