Growth Kinetics of Quantum Size ZnO Particles

1998 ◽  
Vol 536 ◽  
Author(s):  
E. M. Wong ◽  
J. E. Bonevich ◽  
P. C. Searson
Keyword(s):  
Growth Kinetics ◽  
Ostwald Ripening ◽  
Chemical Potential ◽  
Colloidal Suspensions ◽  
Green Emission ◽  
Blue Shift ◽  
Constant Current ◽  
Mass Model ◽  
Zno Particles ◽  
Kinetics Of

AbstractColloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.

ChemInform Abstract: Growth Kinetics of Nanocrystalline ZnO Particles from Colloidal Suspensions.

ChemInform ◽  
2010 ◽  
Vol 30 (1) ◽  
pp. no-no
Author(s):  
E. M. WONG ◽  
J. E. BONEVICH ◽  
P. C. SEARSON
Keyword(s):  
Growth Kinetics ◽  
Colloidal Suspensions ◽  
Zno Particles ◽  
Kinetics Of

Growth Kinetics of Nanocrystalline ZnO Particles from Colloidal Suspensions

1998 ◽  
Vol 102 (40) ◽  
pp. 7770-7775 ◽  
Author(s):  
Eva M. Wong ◽  
John E. Bonevich ◽  
Peter C. Searson
Keyword(s):  
Growth Kinetics ◽  
Colloidal Suspensions ◽  
Zno Particles ◽  
Kinetics Of

scholarly journals Near-equilibrium growth from borophene edges on silver

2019 ◽  
Vol 5 (9) ◽  
pp. eaax0246 ◽  
Author(s):  
Zhuhua Zhang ◽  
Andrew J. Mannix ◽  
Xiaolong Liu ◽  
Zhili Hu ◽  
Nathan P. Guisinger ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
Chemical Potential ◽  
Two Dimensional ◽  
Experimental Characterization ◽  
Two Dimensional Materials ◽  
Low Energies ◽  
The Given ◽  
Kinetics Of ◽  
Equilibrium Growth ◽  
Energy Pathways

Two-dimensional boron, borophene, was realized in recent experiments but still lacks an adequate growth theory for guiding its controlled synthesis. Combining ab initio calculations and experimental characterization, we study edges and growth kinetics of borophene on Ag(111). In equilibrium, the borophene edges are distinctly reconstructed with exceptionally low energies, in contrast to those of other two-dimensional materials. Away from equilibrium, sequential docking of boron feeding species to the reconstructed edges tends to extend the given lattice out of numerous polymorphic structures. Furthermore, each edge can grow via multiple energy pathways of atomic row assembly due to variable boron-boron coordination. These pathways reveal different degrees of anisotropic growth kinetics, shaping borophene into diverse elongated hexagonal islands in agreement with experimental observations in terms of morphology as well as edge orientation and periodicity. These results further suggest that ultrathin borophene ribbons can be grown at low temperature and low boron chemical potential.

scholarly journals Influence mechanism of excipients on drug crystallization: experimental investigation and model analysis and prediction

2022 ◽  
Author(s):  
Qiao Chen ◽  
Jingyun Weng ◽  
Gabriele Sadowski ◽  
Yuanhui Ji
Keyword(s):  
Crystal Growth ◽  
Growth Kinetics ◽  
Surface Reaction ◽  
Chemical Potential ◽  
Potential Gradient ◽  
Reaction Model ◽  
Reaction Rate Constant ◽  
Crystal Growth Kinetics ◽  
Kinetics Of ◽  
And Diffusion

The influence of temperature, stirring speed, and excipients on crystal growth kinetics of mesalazine and allopurinol was investigated through experiment and chemical potential gradient model. The results indicated that the Diffusion-Surface Reaction model (DSR (1,2)) showed good performance in modeling API crystal growth kinetics within the ARDs of 4%. Excipients played a crucial role in inhibiting crystal growth in all the systems. It can not only improve the API solubility, but also reduce the crystal growth rate. By comparing diffusion rate and surface-reaction rate constant within the DSR (1,2) model, it was found that the controlling step of mesalazine crystallization was surface-reaction. Allopurinol crystallization was dominated by both surface-reaction and diffusion. Meanwhile, the crystal growth kinetics of mesalazine and allopurinol were predicted successfully with the ARDs of 2.53% and 4.78%. This work provided a mechanistic understanding of polymer influence on the inhibition of API crystal growth.

scholarly journals Precipitation and Growth Kinetics in Mechanically Alloyed Ni–Al

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
QingXin Tang ◽  
Shigeharu Ukai ◽  
Akinobu Minami ◽  
Shigenari Hayashi
Keyword(s):  
Growth Kinetics ◽  
Ostwald Ripening ◽  
Arrhenius Plot ◽  
Lattice Misfit ◽  
Oxide Dispersion Strengthened ◽  
Mechanically Alloyed ◽  
Spherical Type ◽  
Atom Diffusion ◽  
The Matrix ◽  
Kinetics Of

The precipitation and growth kinetics ofγ′ precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-typeγ′ precipitates are formed in conventional arc-melted Ni–Al alloys, whereas spherical-type precipitates are formed in the mechanically alloyed (MAed) specimens. The morphology is controlled by a lattice misfit between theγ′ precipitates and the matrix at the aging temperature of 800°C. The growth kinetics of theγ′ precipitates can be followed by Ostwald ripening. The Arrhenius plot yielded a lower activation energy for the solute atom diffusion in MAed specimens, which is attributed to their high dislocation density and nanosized grains.

scholarly journals Crystal -Growth Kinetics of Magnetite (FE3O4) Nanoparticles using the Ostwald Ripening Model

2017 ◽  
Vol 8 (8) ◽  
pp. 1445 ◽  
Author(s):  
Ahmad Fadli ◽  
Amun Amri ◽  
Esty Octiana Sari ◽  
Iwantono Iwantono ◽  
Arisman Adnan
Keyword(s):  
Crystal Growth ◽  
Growth Kinetics ◽  
Fe3o4 Nanoparticles ◽  
Ostwald Ripening ◽  
Magnetite Fe3o4 ◽  
Crystal Growth Kinetics ◽  
Kinetics Of

Growth kinetics of tin oxide nanocrystals in colloidal suspensions under hydrothermal conditions

2006 ◽  
Vol 328 (1-3) ◽  
pp. 229-235 ◽  
Author(s):  
Eduardo J.H. Lee ◽  
Caue Ribeiro ◽  
Elson Longo ◽  
Edson R. Leite
Keyword(s):  
Growth Kinetics ◽  
Tin Oxide ◽  
Colloidal Suspensions ◽  
Hydrothermal Conditions ◽  
Kinetics Of

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

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