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The Mixing Behavior of Alkanes Adsorbed on Hexagonal Boron Nitride
Authors:
Matt
Forster
(Diamond Light Source)
,
Julia E.
Parker
(Diamond Light Source)
,
Akira
Inaba
(Research Center for Structural Thermodynamics Graduate School of Science, Osaka University)
,
Claire A.
Murray
(Diamond Light Source)
,
Nicholas A.
Strange
(Department of Chemistry, University of Tennessee)
,
John Z.
Larese
(University of Tennessee)
,
Thomas
Arnold
(Diamond Light Source)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
State:
Published (Approved)
Published:
October 2016
Diamond Proposal Number(s):
8994

Abstract: In this work we report the mixing behavior of a series of normal-alkanes adsorbed on the surface of hexagonal boron nitride (h-BN) using X-ray powder diffraction. We have investigated a range of simple binary mixtures which are indicative of a rich phase behavior with examples of complete mixing, partial mixing and phase separation. On graphite surfaces, the mixing behavior is strongly influenced by the structure of the pure components; the odd-even effect seen in the pure structures, which favors either a “herringbone” or “parallel” structure, influences the miscibility of alkanes within the monolayer. On h-BN a more complex phase behavior is observed with partial mixing or phase separation depending upon the exact composition of the monolayer. In particular, we see improved miscibility for certain mixtures containing n-decane which we associate with the fact that pure n-decane has been observed with both herringbone and parallel structures on h-BN. This difference between these two very similar substrates is a sensitive indicator of the subtle interplay between surface-molecule and molecule-molecule interactions that govern the phase behavior of these systems.
Subject Areas:
Chemistry,
Physics
Instruments:
I11-High Resolution Powder Diffraction
Documents:
acs.jpcc.pdf