The influence of non-stationarity and interphase curvature on the growth dynamics of spherical crystals in a metastable liquid

2021 ◽  
Vol 379 (2205) ◽  
pp. 20200307 ◽  
Author(s):  
Eugenya V. Makoveeva ◽  
Dmitri V. Alexandrov
Keyword(s):  
Phase Transformation ◽  
Distribution Function ◽  
Ostwald Ripening ◽  
Concentration Field ◽  
Transformation Process ◽  
Brownian Diffusion ◽  
Einstein Relation ◽  
Unsteady Temperature ◽  
Phase Transformation Process ◽  
Transient Behaviour

This manuscript is concerned with the theory of nucleation and evolution of a polydisperse ensemble of crystals in metastable liquids during the intermediate stage of a phase transformation process. A generalized growth rate of individual crystals is obtained with allowance for the effects of their non-stationary evolution in unsteady temperature (solute concentration) field and the phase transition temperature shift appearing due to the particle curvature (the Gibbs–Thomson effect) and atomic kinetics. A complete system of balance and kinetic equations determining the transient behaviour of the metastability degree and the particle-radius distribution function is analytically solved in a parametric form. The coefficient of mutual Brownian diffusion in the Fokker–Planck equation is considered in a generalized form defined by an Einstein relation. It is shown that the effects under consideration substantially change the desupercooling/desupersaturation dynamics and the transient behaviour of the particle-size distribution function. The asymptotic state of the distribution function (its ‘tail’), which determines the relaxation dynamics of the concluding (Ostwald ripening) stage of a phase transformation process, is derived. This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.

High efficient phosphate removal by lanthanum modified hydroxyapatite with a phase transformation process

2021 ◽  
Vol 216 ◽  
pp. 211-219
Author(s):  
Zhongjun Li ◽  
Qiwu Wei ◽  
Guisheng Zeng ◽  
Zhong Ren ◽  
Baojin Huang
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
Phosphate Removal ◽  
Phase Transformation Process ◽  
High Efficient

Removal and recovery of Pb from wastewater through a reversible phase transformation process between nano-flower-like Mg(OH)2 and soluble Mg(HCO3)2

2019 ◽  
Vol 6 (2) ◽  
pp. 467-477 ◽  
Author(s):  
Xueming Liu ◽  
Kainan Song ◽  
Weizhen Liu ◽  
Yuecheng Xiong ◽  
Yunyun Xu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Transformation Process ◽  
New Technique ◽  
Phase Transformation Process ◽  
A New Technique ◽  
Reversible Phase ◽  
Removal And Recovery

This study investigated the effectiveness of a new technique for recovering Pb as highly pure PbCO3 nanoparticles from wastewater by using a nano-Mg(OH)2 adsorbent.

scholarly journals Acid–base sites synergistic catalysis over Mg–Zr–Al mixed metal oxide toward synthesis of diethyl carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4695-4702 ◽  
Author(s):  
Tingting Yan ◽  
Weihan Bing ◽  
Ming Xu ◽  
Yinwen Li ◽  
Yusen Yang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Catalytic Performance ◽  
Transformation Process ◽  
Mixed Metal Oxide ◽  
Diethyl Carbonate ◽  
Mixed Metal Oxides ◽  
Acid Base ◽  
Phase Transformation Process ◽  
Mixed Metal ◽  
Synergistic Catalysis

Mg/Zr/Al mixed metal oxides were prepared via a facile phase transformation process of hydrotalcite precursors, which showed acid–base sites synergistic catalytic performance toward the synthesis of diethyl carbonate from ethanol and urea.

Phase transformation process of Tb2O3 at elevated temperature

2019 ◽  
Vol 171 ◽  
pp. 108-111 ◽  
Author(s):  
Junyu Zhang ◽  
Hetuo Chen ◽  
Junping Wang ◽  
Dewen Wang ◽  
Dan Han ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Elevated Temperature ◽  
Transformation Process ◽  
Phase Transformation Process

Phase Transformation during the Hot Pressing of WC-40vol.% Al2O3 Composites

2012 ◽  
Vol 152-154 ◽  
pp. 260-265 ◽  
Author(s):  
Hai Xia Qu ◽  
Shi Gen Zhu
Keyword(s):  
Phase Transformation ◽  
Hot Pressing ◽  
Metal Particle ◽  
High Energy ◽  
Transformation Process ◽  
Matrix Composites ◽  
Pressing Temperature ◽  
Phase Transformation Process ◽  
Vacuum Degree ◽  
Energy Ball

WC matrix composites toughened by commercial Al2O3composed of AlOOH, χ-Al2O3and amorphous Al2O3were prepared by high energy ball milling and then hot pressed at 769°C, 984°C, 1100°C, 1540°C for 90min, respectively, to investigate the phase transformation process. Microstructure and mechanical properties of WC-40vol.%Al2O3composites were studied as well. The results showed that, with the increasing hot pressing temperature, the commercial Al2O3 transformed to α-Al2O3completely through γ-Al2O3. WC could be oxidized and decarburized to W, C and W2C at low temperature when the vacuum degree was very low. The existence of W in the composites sintered at 1540°C for 90min could contribute to a metal particle toughening effect to the composites, resulting in the achievement of an excellent fracture toughness of 10.43MPa•m1/2, combining a Vickers hardness of 18.65GPa with a relative density of 97.98% for WC-40vol.%Al2O3composites.

A new polymorph of Cd3B2O6: synthesis, crystal structure and phase transformation

RSC Advances ◽  
2014 ◽  
Vol 4 (25) ◽  
pp. 13195-13200 ◽  
Author(s):  
Xingwen Zhang ◽  
Hongwei Yu ◽  
Hongping Wu ◽  
Shilie Pan ◽  
Anqing Jiao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
High Temperature ◽  
Transformation Process ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Phase Transformation Process

A new high-temperature phase of Cd3B2O6 (β-Cd3B2O6) has been discovered and the phase transformation process between α- and β-Cd3B2O6 was investigated.

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