Hierarchical Al2O3Nanobelts and Nanowires: Morphology Control and Growth Mechanism

2009 ◽  
Vol 9 (10) ◽  
pp. 4230-4234 ◽  
Author(s):  
Yong Zhang ◽  
Ruying Li ◽  
Xiaorong Zhou ◽  
Mei Cai ◽  
Xueliang Sun
Keyword(s):  
Growth Mechanism ◽  
Morphology Control

Hierarchical Cu2ZnSnS4 Particles for a Low-Cost Solar Cell: Morphology Control and Growth Mechanism

2011 ◽  
Vol 115 (40) ◽  
pp. 19632-19639 ◽  
Author(s):  
Yan-Li Zhou ◽  
Wen-Hui Zhou ◽  
Mei Li ◽  
Yan-Fang Du ◽  
Si-Xin Wu
Keyword(s):  
Solar Cell ◽  
Growth Mechanism ◽  
Cell Morphology ◽  
Low Cost ◽  
Morphology Control

Growth Mechanism and Morphology Control of Porous Hexagonal Plates of Hydrohausmannite Prepared by Hydrothermal Method

2014 ◽  
Vol 513-517 ◽  
pp. 277-280
Author(s):  
De Yan ◽  
Yan Hong Li ◽  
Ying Liu ◽  
Ren Fu Zhuo ◽  
Zhi Guo Wu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Diffraction ◽  
Hydrothermal Method ◽  
Growth Mechanism ◽  
Electron Beam Irradiation ◽  
Morphology Control ◽  
Beam Irradiation ◽  
Selected Area Electron Diffraction ◽  
Experimental Parameters ◽  
Oriented Aggregation

Porous hexagonal plates of hydrohausmannite were prepared by a simple hydrothermal method. Morphology control of the product was easily achieved by adjusting the experimental parameters. The selected area electron diffraction (SAED) patterns show obvious evidence that these hexagonal plates were formed by oriented aggregation-based growth of subunits, which is discussed in details. Intriguing well-shaped hexagonal pores were obtained when the hexagonal plates were exposed to high intensity electron beam irradiation. These hexagonal plates of manganese oxide may have wide applications as components and/or interconnect in nanodevices and/or as nanotools.

Graphite Morphology Control in Cast Iron

1984 ◽  
Vol 34 ◽  
Author(s):  
S. V. Subramanian ◽  
D. A. R. Kay ◽  
G. R. Purdy
Keyword(s):  
Cast Iron ◽  
Growth Mechanism ◽  
Driving Forces ◽  
Morphology Control ◽  
Spiral Growth ◽  
Compacted Graphite ◽  
Spherulitic Morphology ◽  
Graphite Morphology ◽  
Control Diagram ◽  
Graphite Growth

ABSTRACTGraphite morphology in cast iron is analyzed in terms of the growth kinetics of graphite crystals in liquid iron. At small driving forces, i.e., low supersaturation or small kinetic undercooling, graphite growth is characterized by faceted growth, resulting in flake, compacted and spherulitic graphite morphologies. However, at large driving forces, there is a transition from facted to non-faceted growth, resulting in a dendritic growth morphology.Flake morphology is rationalized in terms of impurity dependent crystal growth mechanisms, whereas a spherulitic morphology is attributed to a defect controlled spiral growth mechanism. Compacted graphite morphology is considered as a transition between flake and spherulitic morphology.A thermodynamic approach is used to inter-relate the residual concentrations of impurities of technological interest, i.e. S and 0, as a function of the residual concentration of the reactive elements, Mg, Ca, and Ce in a typical cast iron melt at 1500'C and atmospheric pressure. Such a diagram that quantitatively relates graphite morphology in thick cast iron sections to soluble concentrations of impurities is referred to as a graphite morphology control diagram.In thin section castings that freeze at faster cooling rates and large kinetic undercoolings, the basal spiral growth mechanism dominates over the impurity controlled prism growth mechanism, leading to deviations from predictions based simply on the graphite morphology control diagram. In the ase of compacted graphite, where growth on both the prism and basal faces is involved, the degree of nodularity increases with the cooling rate, giving rise to section sensitivity.At large undercoolings, the prevention of the nucleation and growth of cementite is an essential feature of graphite morphology control. It is estimated that the mobility of the cementite interface exceeds that of the prism interface in flake graphite growth by an order of magnitude and that of the basal interface in spherulitic graphite growth by three orders of magnitude. In practice, the driving force for graphite growth is raised selectively through the addition of graphite stabilizing elements, such as silicon, which raise the temperature of the graphite eutectic and depress the temperature of the carbide eutectic. Kinetic growth undercooling can be decreased by increasing the number of heterogeneous nuclei for graphite growth through inoculation. The application of the above concepts for the control of graphite morphology in shaped automotive castings is discussed.

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO2Microparticles

2015 ◽  
Vol 2015 (31) ◽  
pp. 5209-5217
Author(s):  
Jingcai Zhang ◽  
Jinxin Guo ◽  
Wei Liu ◽  
Shuping Wang ◽  
Anran Xie ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Growth Mechanism ◽  
Morphology Control ◽  
Control Growth

Synthesis, growth mechanism, and morphology control of LiFe1/3Mn1/3Co1/3PO4 via a microwave-assisted hydrothermal method

2015 ◽  
Vol 30 (7) ◽  
pp. 914-923 ◽  
Author(s):  
Kunpeng Wang ◽  
Alexander Ottmann ◽  
Jianxiu Zhang ◽  
Hans-Peter Meyer ◽  
Rüdiger Klingeler
Keyword(s):  
Hydrothermal Method ◽  
Growth Mechanism ◽  
Morphology Control ◽  
Microwave Assisted ◽  
Image Position

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