Document Detail


Heterogeneous nucleation on convex spherical substrate surfaces: A rigorous thermodynamic formulation of Fletcher's classical model and the new perspectives derived.
MedLine Citation:
PMID:  19508089     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Fletcher's spherical substrate model [J. Chem. Phys. 29, 572 (1958)] is a basic model for understanding the heterogeneous nucleation phenomena in nature. However, a rigorous thermodynamic formulation of the model has been missing due to the significant complexities involved. This has not only left the classical model deficient but also likely obscured its other important features, which would otherwise have helped to better understand and control heterogeneous nucleation on spherical substrates. This work presents a rigorous thermodynamic formulation of Fletcher's model using a novel analytical approach and discusses the new perspectives derived. In particular, it is shown that the use of an intermediate variable, a selected geometrical angle or pseudocontact angle between the embryo and spherical substrate, revealed extraordinary similarities between the first derivatives of the free energy change with respect to embryo radius for nucleation on spherical and flat substrates. Enlightened by the discovery, it was found that there exists a local maximum in the difference between the equivalent contact angles for nucleation on spherical and flat substrates due to the existence of a local maximum in the difference between the shape factors for nucleation on spherical and flat substrate surfaces. This helps to understand the complexity of the heterogeneous nucleation phenomena in a practical system. Also, it was found that the unfavorable size effect occurs primarily when R<5r( *) (R: radius of substrate and r( *): critical embryo radius) and diminishes rapidly with increasing value of R/r( *) beyond R/r( *)=5. This finding provides a baseline for controlling the size effects in heterogeneous nucleation.
Authors:
Ma Qian; Jie Ma
Related Documents :
19210989 - Theoretical analysis of the enhancement effect in photosynthesis evidence for the "spil...
17492099 - Semi-empirical molecular orbital methods including dispersion corrections for the accur...
20962159 - A computational model to determine energy intake during weight loss.
21411949 - Artificial neural network for predicting biosorption of methylene blue by spirulina sp.
20181279 - Free energy estimation of short dna duplex hybridizations.
21107519 - Statistical optimization of parametric accelerated failure time model for mapping survi...
21807569 - β-1 and β-2 adrenergic receptor polymorphism and association with cardiovascular respon...
17715159 - Mendelian randomization as an instrumental variable approach to causal inference.
21968149 - What are self-generated actions?
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of chemical physics     Volume:  130     ISSN:  1089-7690     ISO Abbreviation:  J Chem Phys     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-10     Completed Date:  2009-08-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375360     Medline TA:  J Chem Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  214709     Citation Subset:  -    
Affiliation:
The University of Queensland, School of Engineering, ARC Centre of Excellence for Design in Light Metals, Brisbane, Queensland 4072, Australia. ma.qian@uq.edu.au
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Electronic structure, linear, and nonlinear optical responses in magnetoelectric multiferroic materi...
Next Document:  Nonlinear light scattering from clusters and single particles.