Crystal Nucleation Kinetics from Induction Times and Metastable Zone Widths

2013 ◽  
Vol 13 (6) ◽  
pp. 2435-2440 ◽  
Author(s):  
Samir A. Kulkarni ◽  
Somnath S. Kadam ◽  
Hugo Meekes ◽  
Andrzej I. Stankiewicz ◽  
Joop H. ter Horst
Keyword(s):  
Crystal Nucleation ◽  
Nucleation Kinetics ◽  
Metastable Zone ◽  
Induction Times

scholarly journals Unveiling the self-association and desolvation in crystal nucleation

IUCrJ ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 468-479
Author(s):  
Danning Li ◽  
Yongli Wang ◽  
Shuyi Zong ◽  
Na Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
Density Functional ◽  
Interaction Strength ◽  
Solution Chemistry ◽  
The Self ◽  
Crystal Nucleation ◽  
Nucleation Kinetics ◽  
Molecular Conformations ◽  
Self Association ◽  
Induction Times ◽  
The Relationship

As the first step in the crystallization process, nucleation has been studied by many researchers. In this work, phenacetin (PHEN) was selected as a model compound to investigate the relationship between the solvent and nucleation kinetics. Induction times at different supersaturation in six solvents were measured. FTIR and NMR spectroscopy were employed to explore the solvent–solute interactions and the self-association properties in solution. Density functional theory (DFT) was adopted to evaluate the strength of solute–solvent interactions and the molecular conformations in different solvents. Based on these spectroscopy data, molecular simulation and nucleation kinetic results, a comprehensive understanding of the relationship between molecular structure, crystal structure, solution chemistry and nucleation dynamics is discussed. Both the solute–solvent interaction strength and the supramolecular structure formed by the self-association of solute molecules affect the nucleation rate. The findings reported here shed new light on the molecular mechanism of nucleation in solution.

Surface Induced Calcium Phosphate Nucleation and Growth

1995 ◽  
Vol 414 ◽  
Author(s):  
L. Song ◽  
A. A. Campbell ◽  
X. S. Li ◽  
B. C. Bunker
Keyword(s):  
Calcium Phosphate ◽  
Phase Formation ◽  
Octacalcium Phosphate ◽  
Crystal Nucleation ◽  
X Ray Diffraction ◽  
Nucleation Kinetics ◽  
Constant Composition ◽  
Phosphate Dihydrate ◽  
Induction Times

AbstractCalcium phosphate nucleation on colloidal oxide surfaces, such as TiO2, SiO2 and Al2MO3, has been studied as a model system to understand the role of surface chemistry on crystal nucleation kinetics and phase formation. The nucleation induction times have been measured using Constant Composition (CC) technique and calcium phosphate phases formation have been determined mainly by X-ray diffraction. The results indicated TiO2 not only significantly reduces the nucleation induction time and interfacial energy but also stimulates octacalcium phosphate formation over dicalcium phosphate dihydrate. SiO2 and Al2O3 have little effect on both nucleation kinetics and phase formation.

scholarly journals Sugar Industry: Effect of Dextran Concentrations on the Sucrose Crystallization in Aqueous Solutions

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Abdelali Borji ◽  
Fatima-Ezzahra Borji ◽  
Abdelaziz Jourani
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Growth Process ◽  
Sugar Industry ◽  
Nucleation Kinetics ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Industry Effect ◽  
Instantaneous Nucleation ◽  
Metastable Zone

Using the spectrophotometric method, as a new method, the influence of dextran on the sucrose solubility and metastable zone width has been studied. In agreement with the literature the experimental data show that the dextran has a negligible effect on the sucrose solubility. The results also show that this impurity decreases the sucrose metastable zone width. The study of the nucleation kinetics performed, using Nyvlt’s approach, shows that the dextran accelerates the nucleation and that the nuclei are formed in the solution by instantaneous nucleation. The presence of dextran in the system causes a decrease in the growth rate of sucrose. The growth process of sucrose is governed by a Birth and Spread mechanism. The kinetic parameters of sucrose growth in aqueous solutions without and with dextran were estimated.

Nucleation and Glass Formation

1985 ◽  
Vol 57 ◽  
Author(s):  
D. R. Uhlmann ◽  
M. C. Weinberg
Keyword(s):  
Glass Formation ◽  
Nucleation Theory ◽  
Crystal Nucleation ◽  
Oxide Glass ◽  
Classical Nucleation Theory ◽  
Nucleation Kinetics ◽  
Formation Behavior ◽  
Homogeneous Crystal ◽  
Exponential Factors

AbstractThe role of nucleation kinetics in affecting glass formation behavior is discussed. Also considered are measurements of homogeneous crystal nucleation in a variety of liquids. For a number of oxide glass-forming liquids, available data indicate pre-exponential factors which are larger than those predicted from classical nucleation theory by factors of 1017 to 1049. Possible sources of this discrepancy are discussed.

scholarly journals Analytical solutions of mushy layer equations describing directional solidification in the presence of nucleation

2018 ◽  
Vol 376 (2113) ◽  
pp. 20170217 ◽  
Author(s):  
Dmitri V. Alexandrov ◽  
Alexander A. Ivanov ◽  
Irina V. Alexandrova
Keyword(s):  
Phase Transition ◽  
Supercooled Liquid ◽  
Crystal Nucleation ◽  
Supersaturated Solution ◽  
Pure Liquid ◽  
Particle Nucleation ◽  
Nucleation Kinetics ◽  
Differential Model ◽  
Phase Transition Interface ◽  
Phase Transition Boundary

The processes of particle nucleation and their evolution in a moving metastable layer of phase transition (supercooled liquid or supersaturated solution) are studied analytically. The transient integro-differential model for the density distribution function and metastability level is solved for the kinetic and diffusionally controlled regimes of crystal growth. The Weber–Volmer–Frenkel–Zel’dovich and Meirs mechanisms for nucleation kinetics are used. We demonstrate that the phase transition boundary lying between the mushy and pure liquid layers evolves with time according to the following power dynamic law: , where Z 1 ( t )= βt 7/2 and Z 1 ( t )= βt 2 in cases of kinetic and diffusionally controlled scenarios. The growth rate parameters α , β and ε are determined analytically. We show that the phase transition interface in the presence of crystal nucleation and evolution propagates slower than in the absence of their nucleation. This article is part of the theme issue ‘From atomistic interfaces to dendritic patterns’.

Role of dynamic heterogeneities in crystal nucleation kinetics in an oxide supercooled liquid

2016 ◽  
Vol 145 (21) ◽  
pp. 211920 ◽  
Author(s):  
Prabhat K. Gupta ◽  
Daniel R. Cassar ◽  
Edgar D. Zanotto
Keyword(s):  
Supercooled Liquid ◽  
Crystal Nucleation ◽  
Nucleation Kinetics
Sign in / Sign up

Export Citation Format

Share Document