Interface-based crystal particle autoselection via membrane crystallization: From scaling to process control

Xiaobin Jiang; Dapeng Lu; Wu Xiao; Guannan Li; Rui Zhao; Xiangcun Li; Gaohong He; Xuehua Ruan

doi:10.1002/aic.16459

Interface-based crystal particle autoselection via membrane crystallization: From scaling to process control

AIChE Journal ◽

10.1002/aic.16459 ◽

2018 ◽

Vol 65 (2) ◽

pp. 723-733 ◽

Cited By ~ 9

Author(s):

Xiaobin Jiang ◽

Dapeng Lu ◽

Wu Xiao ◽

Guannan Li ◽

Rui Zhao ◽

...

Keyword(s):

Process Control ◽

Crystal Particle

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Electron Microscopy of the Shape of Small Metal Particles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100079024 ◽

1977 ◽

Vol 35 ◽

pp. 300-301

Author(s):

M. Jose Yacaman

Keyword(s):

Electron Microscopy ◽

Metal Particle ◽

Field Experiments ◽

Size Range ◽

Dark Field ◽

Metal Particles ◽

Bragg Condition ◽

Crystal Particle ◽

Small Metal Particle ◽

Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

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Formation Mechanisms for Multiply Twinned Particles During Nucleation in the Au/MICA System

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100114049 ◽

1975 ◽

Vol 33 ◽

pp. 84-85

Author(s):

Eal H. Lee ◽

Helmut Poppa

Keyword(s):

Deposition Time ◽

High Vacuum ◽

Dark Field ◽

Ultra High Vacuum ◽

Formation Mechanisms ◽

Heat Treated ◽

Cluster Density ◽

Diffraction Patterns ◽

Crystal Particle ◽

Multiply Twinned Particles

The formation of thin films of gold on mica has been studied in ultra-high vacuum (5xl0-10 torr) . The mica substrates were heat-treated for 24 hours at 375°C, cleaved, and annealed for 15 minutes at the deposition temperature of 300°C prior to deposition. An impingement flux of 3x1013 atoms cm-2 sec-1 was used. These conditions were found to give high number densities of multiple twin particles and are based on a systematic series of nucleation experiments described elsewhere. Individual deposits of varying deposition time were made and examined by bright and dark field TEM after "cleavage preparation" of highly transparent specimens. In the early stages of growth, the films generally consist of small particles which are either single crystals or multiply twinned; a strong preference for multiply twinned particles was found whenever the particle number densities were high. Fig. 1 shows the stable cluster density ns and the variation with deposition time of multiple twin particle and single crystal particle densities, respectively. Corresponding micrographs and diffraction patterns are shown in Fig. 2.

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