Impurity Effects in Surface Diffusion on Aluminum Oxide

1969 ◽  
pp. 273-283 ◽  
Author(s):  
W. M. Robertson ◽  
F. E. Ekstrom
Keyword(s):  
Aluminum Oxide ◽  
Surface Diffusion ◽  
Impurity Effects

Surface diffusion of stearic acid on aluminum oxide

AIChE Journal ◽  
1974 ◽  
Vol 20 (4) ◽  
pp. 735-742 ◽  
Author(s):  
Ralph T. Yang ◽  
John B. Fenn ◽  
Gary L. Haller
Keyword(s):  
Aluminum Oxide ◽  
Stearic Acid ◽  
Surface Diffusion

Impurity Effects on the Swelling of Irradiated Aluminum Oxide

1972 ◽  
Vol 13 (2) ◽  
pp. 225-226
Author(s):  
R. A. Skarupa ◽  
C. E. Backus
Keyword(s):  
Aluminum Oxide ◽  
Impurity Effects

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
Sign in / Sign up

Export Citation Format

Share Document