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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5b03133
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|a eng
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|a Gosvami, N N
|e verfasserin
|4 aut
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|a Nanoscale Trapping and Squeeze-Out of Confined Alkane Monolayers
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|c 2015
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|a Text
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|a ƒaComputermedien
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|a Date Completed 16.03.2016
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|a Date Revised 01.12.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We present combined force curve and conduction atomic force microscopy (AFM) data for the linear alkanes CnH2n+2 (n = 10, 12, 14, 16) confined between a gold-coated AFM tip and a graphite surface. Solvation layering is observed in the force curves for all liquids, and conduction AFM is used to study in detail the removal of the confined (mono)layer closest to the graphite surface. The squeeze-out behavior of the monolayer can be very different depending upon the temperature. Below the monolayer melting transition temperatures the molecules are in an ordered state on the graphite surface, and fast and complete removal of the confined molecules is observed. However, above the melting transition temperature the molecules are in a disordered state, and even at large applied pressure a few liquid molecules are trapped within the tip-sample contact zone. These findings are similar to a previous study for branched alkanes [ Gosvami Phys. Rev. Lett. 2008, 100, 076101 ], but the observation for the linear alkane homologue series demonstrates clearly the dependence of the squeeze-out and trapping on the state of the confined material
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|a Journal Article
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|a O'Shea, S J
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
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|g 31(2015), 47 vom: 01. Dez., Seite 12960-7
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