Thermodynamic stability of interfacial gaseous states

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Title: Thermodynamic stability of interfacial gaseous states
Author(s): Zhang, Xue Hua; Maeda, Nobuo; Hu, Jun
Abstract: We studied the thermodynamic stability of interfacial gaseous states on atomically smooth highly ordered pyrolytic graphite (HOPG) in water using atomic force microscopy. Quasi-two-dimensional gas layers (micropancakes) required a higher supersaturation of gas than spherical-cap-shaped nanobubbles. The two forms of gas coexisted at a sufficiently high supersaturation of gas where one or more of the nanobubbles may sit on top of a micropancake. The micropancakes spontaneously coalesced with each other over time. After the coalescence of two neighboring micropancakes which each had had a nanobubble on top, one nanobubble grew at the expense of the other. We analyzed these results assuming temporal and local quasi-equilibrium conditions.
Publication type: Journal article
Source: Journal of Physical Chemistry B, Vol. 112, no. 44 (Nov 2008), pp. 13671-13675
Publication year: 2008
FOR Code(s): 02 Physical Sciences; 03 Chemical Sciences; 09 Engineering
Keyword(s): Atomic force microscopy; Atomic forces; Carbon; Chemistry; Equilibrium conditions; Gas layers; Gaseous states; Gases; Graphite; Highly ordered pyrolytic graphites; Nanobubbles; Pyrrole derivative; Pyrroles; Supersaturation; Thermodynamic stability; Thermodynamics; Water using
Publisher: American Chemical Society
ISSN: 1520-6106
Publisher URL: http://dx.doi.org/10.1021/jp807515f
Peer reviewed