A New Mechanism for Surface Diffusion: Motion of a Substrate-Adsorbate Complex

1994 ◽  
Vol 98 (43) ◽  
pp. 11136-11142 ◽  
Author(s):  
S. J. Stranick ◽  
A. N. Parikh ◽  
D. L. Allara ◽  
P. S. Weiss
Keyword(s):  
Surface Diffusion ◽  
Diffusion Motion

scholarly journals Numerical simulation of surface diffusion motion and its application in MEMS fabrication

2019 ◽  
Vol 1303 ◽  
pp. 012024
Author(s):  
Yujie Zhang ◽  
Fan Zeng ◽  
Man Wong ◽  
Junping Xiang ◽  
Wenjing Ye
Keyword(s):  
Numerical Simulation ◽  
Surface Diffusion ◽  
Mems Fabrication ◽  
Diffusion Motion

A Flux-Corrected Phase-Field Method for Surface Diffusion

2017 ◽  
Vol 22 (2) ◽  
pp. 422-440 ◽  
Author(s):  
Yujie Zhang ◽  
Wenjing Ye
Keyword(s):  
Surface Diffusion ◽  
Phase Field ◽  
Field Method ◽  
Phase Field Method ◽  
Current Phase ◽  
Field Methods ◽  
Degenerate Mobility ◽  
Shrinkage Effect ◽  
Diffusion Motion ◽  
Phase Field Methods

AbstractPhase-field methods with a degenerate mobility have been widely used to simulate surface diffusion motion. However, apart from the motion induced by surface diffusion, adverse effects such as shrinkage, coarsening and false merging have been observed in the results obtained from the current phase-field methods, which largely affect the accuracy and numerical stability of these methods. In this paper, a flux-corrected phase-field method is proposed to improve the performance of phase-field methods for simulating surface diffusion. The three effects were numerically studied for the proposed method and compared with those observed in the two existing methods, the original phase-field method and the profile-corrected phase-field method. Results show that compared to the original phase-field method, the shrinkage effect in the profile-corrected phase-field method has been significantly reduced. However, coarsening and false merging effects still present and can be significant in some cases. The flux-corrected phase field performs the best in terms of eliminating the shrinkage and coarsening effects. The false merging effect still exists when the diffuse regions of different interfaces overlap with each other. But it has been much reduced as compared to that in the other two methods.

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

Blue Sapphire with Partial Red Surface Diffusion

2020 ◽  
Vol 37 (1) ◽  
pp. 23-24
Author(s):  
Bear Williams ◽  
Cara Williams ◽  
Charles I. Carmona
Keyword(s):  
Surface Diffusion

Enriching the branching of Au@PdAu core–shell nanocrystals using a syringe pump: kinetics control meets lattice mismatch

CrystEngComm ◽  
2021 ◽  
Vol 23 (13) ◽  
pp. 2582-2589
Author(s):  
Gongguo Zhang ◽  
Yanyun Ma ◽  
Xiaowei Fu ◽  
Wenjun Zhao ◽  
Feng Liu ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Surface Diffusion ◽  
Lattice Mismatch ◽  
Core Shell ◽  
Syringe Pump ◽  
Seeded Growth ◽  
Gold Nanocrystals

Gold@palladium–gold nanocrystals with a tunable branched shape are prepared via seeded growth, where the use of a syringe pump allows the manipulation over reaction kinetics as coupled by surface diffusion and strain caused by lattice mismatch.

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