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Spontaneous imbibition dynamics of an n-alkane in nanopores: evidence of meniscus freezing and monolayer sticking
Publikationstyp
Journal Article
Date Issued
2009-10-20
Sprache
English
Author(s)
Journal
Volume
103
Issue
17
Article Number
174501
Citation
Physical Review Letters 103 (17): 174501 (2009-10-22)
Publisher DOI
Scopus ID
ArXiv ID
Publisher
American Physical Society
Capillary filling dynamics of liquid n-tetracosane (n-C24H50) in a network of cylindrical pores with 7 and 10 nm mean diameter in monolithic silica glass (Vycor) exhibit an abrupt temperature-slope change at Ts=54 deg C, ~4 deg C above bulk and ~16 deg C, 8 deg C, respectively, above pore freezing. It can be traced to a sudden inversion of the surface tension's T slope, and thus to a decrease in surface entropy at the advancing pore menisci, characteristic of the formation of a single solid monolayer of rectified molecules, known as surface freezing from macroscopic, quiescent tetracosane melts. The imbibition speeds, that are the squared prefactors of the observed square-root-of-time
Lucas-Washburn invasion kinetics, indicate a conserved bulk fluidity and capillarity of the nanopore-confined liquid, if we assume a flat lying, sticky hydrocarbon backbone monolayer at the silica walls.
Lucas-Washburn invasion kinetics, indicate a conserved bulk fluidity and capillarity of the nanopore-confined liquid, if we assume a flat lying, sticky hydrocarbon backbone monolayer at the silica walls.
Subjects
Physics - Fluid Dynamics
Physics - Fluid Dynamics
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Soft Condensed Matter
Physics - Chemical Physics
DDC Class
530: Physik