Journal ArticleDOI
Granulation, Phase Change, and Microstructure Kinetics of Phase Change. III
Reads0
Chats0
TLDR
In this paper, a comprehensive description of the phenomena of phase change may be summarized in Phase Change, Grain Number and Microstructure Formulas or Diagrams, giving, respectively, the transformed volume, grain, and microstructure densities as a function of time, temperature, and other variables.Abstract:
The theory of the preceding papers is generalized and the notation simplified. A cluster of molecules in a stable phase surrounded by an unstable phase is itself unstable until a critical size is reached, though for statistical reasons a distribution of such clusters may exist. Beyond the critical size, the cluster tends to grow steadily. The designation ``nuclei'' or ``grains'' is used according as the clusters are below or above the critical size. It is shown that a comprehensive description of the phenomena of phase change may be summarized in Phase Change, Grain Number and Microstructure Formulas or Diagrams, giving, respectively, the transformed volume, grain, and microstructure densities as a function of time, temperature, and other variables. To facilitate the deduction of formulas for these densities the related densities of the ``extended'' grain population are introduced. The extended population is that system of interpenetrating volumes that would obtain if the grains granulated and grew through each other without mutual interference. The extended densities are much more readily derivable from an analysis of the fundamental processes of granulation and growth. It is shown that, under very general circumstances, the densities of the actual grain population may be expressed simply in terms of the extended population.read more
Citations
More filters
Journal ArticleDOI
Enhanced nucleation rate of polylactide in composites assisted by surface acid oxidized carbon nanotubes of different aspect ratios.
Zhaohua Xu,Zhaohua Xu,Yanhua Niu,Zhigang Wang,Zhigang Wang,Heng Li,Liang Yang,Jie Qiu,Howard Wang +8 more
TL;DR: The different aspect ratio A-MWCNTs with the same carboxyl group mass percent show substantial effects on PLA crystallization kinetics, and those with smaller aspect ratios enhance nucleation rate for PLA spherulites much more than those with larger aspect ratios.
Journal ArticleDOI
Effects of SWNT and Metallic Catalyst on Hydrogen Absorption/Desorption Performance of MgH2
TL;DR: It is suggested that metallic particles may be mainly responsible for the improvement of the hydrogen absorption kinetics, and SWNTs for the enhancement of hydrogen absorption capacity of MgH2.
Journal ArticleDOI
Nucleating heterogeneities and glass formation
TL;DR: In this paper, the authors extended the kinetic treatment of glass formation by the introduction of continuous cooling (CT) curves to estimate the cooling rates required to form glasses of various materials.
Journal ArticleDOI
Combined kinetic analysis for crystallization kinetics of non-crystalline solids
TL;DR: In this article, a new method of kinetic analysis that allows the combined analysis of data obtained under different experimental conditions, i.e. heating pathway, is presented for the crystallization of non-crystalline solids.
Journal ArticleDOI
Studies of sulfonated block copolymer and its blends
Asmae Mokrini,J. L. Acosta +1 more
TL;DR: In this article, the synthesis and characterization of a sulfonated polymer based on hydrogenated poly(styrene-butadiene) block copolymer (HPBS) was reported.
References
More filters
Journal ArticleDOI
Kinetics of Phase Change. I General Theory
TL;DR: In this paper, the theory of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered by previous treatment.
Journal ArticleDOI
Kinetics of Phase Change. II Transformation‐Time Relations for Random Distribution of Nuclei
TL;DR: In this article, a relation between the actual transformed volume V and a related extended volume V1 ex is derived upon statistical considerations, and a rough approximation to this relation is shown to lead, under the proper conditions, to the empirical formula of Austin and Rickett.
Journal ArticleDOI
Grand Partition Functions and So‐Called ``Thermodynamic Probability''
TL;DR: The relation due to Boltzmann between entropy and thermodynamic probability is enunciated in a precise form in this paper and generalized in such a way that each of the other thermodynamic potentials is related in a similar manner to a ''thermodynamic probability'' for which a more suitable name is a ''partition function''.