Prediction of bubble growth and size distribution in polymer foaming based on a new heterogeneous nucleation model

2004 ◽  
Vol 48 (2) ◽  
pp. 439-462 ◽  
Author(s):  
James J. Feng ◽  
Christopher A. Bertelo
Keyword(s):  
Size Distribution ◽  
Heterogeneous Nucleation ◽  
Bubble Growth ◽  
Polymer Foaming ◽  
Nucleation Model

The Origin and Implications of (111)-Textured Grains Obtained via Nucleation and Growth of Solids in Pulsed-Laser-Quenched Al Films on SiO2

2006 ◽  
Vol 979 ◽  
Author(s):  
J. B. Choi ◽  
Min H. Choi ◽  
U.-J. Chung ◽  
A. B. Limanov ◽  
James S. Im
Keyword(s):  
Energy Density ◽  
Laser Irradiation ◽  
Heterogeneous Nucleation ◽  
Microstructural Analysis ◽  
Pulsed Laser ◽  
Nucleation And Growth ◽  
Nucleation Model ◽  
Wide Energy ◽  
Excimer Laser Irradiation ◽  
Condensed Systems

AbstractWe have investigated excimer laser irradiation of 2000-Å-thin as-deposited Al films on SiO2. Microstructural analysis of the irradiated films conducted with AFM and EBSD techniques reveals that there exists a wide energy density interval over which large equaxed grains with a strong (111) texture are obtained. Based on thermal, transformational, and microstructural considerations, we propose a heterogeneous nucleation model to account for the observed behaviors, and discuss the implication of the model on the phenomenon of heterogeneous nucleation of crystalline solids in condensed systems as regards the thermodynamic role played by the orientation of subcritical clusters.

Numerical analysis of the effect of the local variation of viscosity on bubble growth and deformation in polymer foaming

2019 ◽  
Vol 63 (6) ◽  
pp. 895-903 ◽  
Author(s):  
Mohammadmehdi Ataei ◽  
Vahid Shaayegan ◽  
Chongda Wang ◽  
Franco Costa ◽  
Sejin Han ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Bubble Growth ◽  
Local Variation ◽  
Polymer Foaming

The Initial Stages of Silicide Epitaxy - Nucleation and Morphology

1987 ◽  
Vol 94 ◽  
Author(s):  
R. J. Nemanich ◽  
C. M. Doland ◽  
F. A. Ponce
Keyword(s):  
Heterogeneous Nucleation ◽  
Cluster Size ◽  
Critical Thickness ◽  
Nucleation And Growth ◽  
Silicide Formation ◽  
Initial Thickness ◽  
Critical Cluster ◽  
Compound Formation ◽  
Nucleation Model ◽  
Metal Overlayers

ABSTRACTThe initial stages of epitaxial silicide formation are described in terms of the nucleation properties. The reaction process is divided into the stages of interdiffusion, nucleation, and growth and coalescence. The aspects of the nucleation from the interdiffused regions are described. Results are presented for Pd and Pt deposited on clean Si surfaces. The initial thickness where silicide compound formation is observed is related to he critical cluster size of the nucleation model. The epitaxial morphology can be strongly influenced by heterogeneous nucleation involving the substrate interface, and this effect is demonstrated by reaction with metal overlayers less than the critical thickness.

Modeling Diffusion-Induced Bubble Growth in Polymer Liquids

2003 ◽  
Vol 22 (2) ◽  
pp. 89-102 ◽  
Author(s):  
David C. Venerus
Keyword(s):  
Bubble Growth ◽  
Growth Dynamics ◽  
Growth Behavior ◽  
Liquid Viscosity ◽  
Transport Models ◽  
Blowing Agent ◽  
Polymer Foaming ◽  
Polymer Liquids ◽  
Complex Phenomena

Accurate modeling of diffusion-induced bubble growth is essential for the development of efficient polymer foaming processes. Consequently, a large number of transport models of this complex phenomena have been formulated. In most previous studies, one or more simplifying approximations have been invoked to reduce mathematical complexity. In this paper, we present and compare several models of bubble growth in liquids and examine the effects blowing agent concentration, liquid viscosity and elasticity on bubble growth dynamics. In addition, we compare predicted and measured bubble growth behavior in two polymer foaming systems.

scholarly journals Technical Note: The heterogeneous Zeldovich factor

2007 ◽  
Vol 7 (2) ◽  
pp. 309-313 ◽  
Author(s):  
H. Vehkamäki ◽  
A. Määttänen ◽  
A. Lauri ◽  
I. Napari ◽  
M. Kulmala
Keyword(s):  
Surface Area ◽  
Heterogeneous Nucleation ◽  
Technical Note ◽  
Exact Form ◽  
Cluster Surface ◽  
Nucleation Model

Abstract. In this technical note we present the exact form of the Zeldovich factor for heterogeneous nucleation on spherical pre-existing particles. We study the error caused by planar pre-existing surface approximations, which have been used in our earlier heterogeneous nucleation model and elsewhere in the literature. We also test the significance of widely used approximations for cluster surface area and circumference. We conclude that the approximations do not affect the predicted onset saturation. Especially for small pre-existing particles the nucleation rates calculated with the exact and approximative models differ significantly.

Halloysite-to-kaolinite transformation by dissolution and recrystallization during weathering of crystalline rocks

Clay Minerals ◽  
2012 ◽  
Vol 47 (3) ◽  
pp. 373-390 ◽  
Author(s):  
A. Inoue ◽  
M. Utada ◽  
T. Hatta
Keyword(s):  
Sri Lanka ◽  
Size Distribution ◽  
Heterogeneous Nucleation ◽  
Crystal Size ◽  
Open Systems ◽  
Crystalline Rocks ◽  
Convincing Evidence ◽  
Weathering Profile ◽  
Long Period ◽  
Relationship Of

AbstractThe present study, which was carried out on a deep weathering profile of quartz diorite in the San'in district, Japan, along with two lateritic samples from India and Sri Lanka, provides convincing evidence supporting the dissolution and recrystallization mechanism for the halloysite-to-kaolinite transformation during weathering of crystalline rocks. In all the samples studied, tubular halloysite formed prior to kaolinite via the dissolution of feldspars and precipitation from solution. The crystal size distribution of tubular halloysite formed early was characterized by a lognormal curve having a positive asymmetry. When the activity of water decreased in the weathering profile, halloysite as well as goethite began to dehydrate, which acted as a trigger for dissolving halloysite. The heterogeneous nucleation of kaolinite took place on the edges and in the shrinkage pores of dehydrated halloysite tubes. The topotactic relationship of b*halloysite//b*kaolinite was kept between the substrate halloysite and the product kaolinite in the incipient growing stages of kaolinite. As a consequence, early formed halloysite transforms to kaolinite in a cannibalistic manner over a long period of time, owing to the intermittent supply of solution undersaturated with respect to halloysite in natural open systems.

An arbitrary Lagrangian–Eulerian method for simulating bubble growth in polymer foaming

2007 ◽  
Vol 226 (2) ◽  
pp. 2229-2249 ◽  
Author(s):  
Pengtao Yue ◽  
James J. Feng ◽  
Christopher A. Bertelo ◽  
Howard H. Hu
Keyword(s):  
Bubble Growth ◽  
Arbitrary Lagrangian Eulerian ◽  
Eulerian Method ◽  
Arbitrary Lagrangian Eulerian Method ◽  
Polymer Foaming
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