TY  - JOUR
AU  - Hoth, Judith
AU  - Hausen, Florian
AU  - Müser, Martin
AU  - Bennewitz, Roland
TI  - Force microscopy of layering and friction in an ionic liquidus
JO  - Journal of physics / Condensed matter
VL  - 26
IS  - 28
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2014-06825
SP  - 284110 
PY  - 2014
AB  - The mechanical properties of the ionic liquid 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl) trifluorophosphate ([Py1,4][FAP]) in confinement between a SiOx and a Au(1 1 1) surface are investigated by means of atomic force microscopy (AFM) under electrochemical control. Up to 12 layers of ion pairs can be detected through force measurements while approaching the tip of the AFM to the surface. The particular shape of the force versus distance curve is explained by a model for the interaction between tip, gold surface and ionic liquid, which assumes an exponentially decaying oscillatory force originating from bulk liquid density correlations. Jumps in the tip–sample distance upon approach correspond to jumps of the compliant force sensor between branches of the oscillatory force curve. Frictional force between the laterally moving tip and the surface is detected only after partial penetration of the last double layer between tip and surface.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000338830300011
C6  - pmid:24919549
DO  - DOI:10.1088/0953-8984/26/28/284110
UR  - https://juser.fz-juelich.de/record/173415
ER  -