TY  - JOUR
AU  - Kusmin, A.
AU  - Gruener, S.
AU  - Henschel, A.
AU  - Holderer, O.
AU  - Allgaier, J.
AU  - Richter, D.
AU  - Huber, P.
TI  - Evidence of a Sticky Boundary Layer in Nanochannels: A Neutron Spin Echo Study of n-Hexatriacontane and Poly(ethylene oxide) Confined in Porous Silicon
JO  - The journal of physical chemistry letters
VL  - 1
SN  - 1948-7185
CY  - Washington, DC
PB  - Soc.
M1  - PreJuSER-11624
SP  - 3116 - 3121
PY  - 2010
N1  - This work has been supported by the German Research Foundation (DEG) within the priority program SP 1164, Nano- and Microfluidics, grant no Hu 850/2
AB  - Neutron spin echo spectra of the melts of n-hexatriacontane (C36) and poly(ethylene oxide) (PEO), 2 kg/mol, confined in circular channels with a mean diameter of 10 and 12 nm, respectively, in porous silicon, were recorded at Q values between 0.05 and 0.15 angstrom(-1). The spectra were successfully analyzed in terms of a two-state model where wall-adsorbed molecules are immobile and free molecules have a bulk-like dynamics. For C36, we find an adsorbed bilayer at 364 K and a monolayer at 435 K (in both cases, the long axis of the molecules is oriented parallel to the surface) and no adsorbed layer at 512 K. For PEO, we find an adsorbed monolayer at 413 K. The results support the existence of a sticky boundary layer inferred from capillary filling experiments.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000283463500022
DO  - DOI:10.1021/jz1012406
UR  - https://juser.fz-juelich.de/record/11624
ER  -