The characteristics of heterogeneous nucleation on concave surfaces and implications for directed nucleation or surface activity by surface nanopatterning

Qian, M. and Ma, J. (2012) The characteristics of heterogeneous nucleation on concave surfaces and implications for directed nucleation or surface activity by surface nanopatterning. Journal of Crystal Growth, 355 1: 73-77. doi:10.1016/j.jcrysgro.2012.06.031


Author Qian, M.
Ma, J.
Title The characteristics of heterogeneous nucleation on concave surfaces and implications for directed nucleation or surface activity by surface nanopatterning
Journal name Journal of Crystal Growth   Check publisher's open access policy
ISSN 0022-0248
1873-5002
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1016/j.jcrysgro.2012.06.031
Volume 355
Issue 1
Start page 73
End page 77
Total pages 5
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
The characteristics of heterogeneous nucleation on concave spherical surfaces were analysed using a novel analytical approach and compared with nucleation on both convex and planar surfaces. The complex expressions of ∂ΔG/∂r (ΔG: free energy change and r: embryo radius) for nucleation on concave spherical surfaces can be reduced to the simple form for nucleation on planar surfaces by introducing an appropriate pseudo-contact angle, providing a new fundamental link. The advantages of heterogeneous nucleation on a concave spherical surface of radius R over a planar surface occur primarily when 2R<10r⁎ (r*: nucleus radius) and diminish rapidly when 2R>10r*. This is similar to nucleation on convex spherical surfaces, where the disadvantages of nucleation over a planar surface occur primarily when 2R<10r* and diminish rapidly when 2R>10r*. The substrate size 10r* thus provides an approximate borderline that distinguishes between curved and planar surfaces for nucleation. The advantages or disadvantages of nucleation over a planar surface are most outstanding when the concave (advantageous) or convex (disadvantageous) surface shows a specific contact angle with the nucleus. The nanoscale nature of the threshold size 10r* presents a clear fundamental support to surface nanopatterning for directed nucleation. A minimum depth is required for a nanoscale crater to be a favourable nucleation site.
Keyword Nucleation
Surfaces
Surface structure
Surface processes
Roughening
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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