A model kinetics for nucleation at a solid surface with application to diamond deposition from the gas phase

1991 ◽  
Vol 70 (12) ◽  
pp. 7573-7578 ◽  
Author(s):  
M. Tomellini ◽  
R. Polini ◽  
V. Sessa
Keyword(s):  
Gas Phase ◽  
Solid Surface ◽  
Diamond Deposition

Phase diagrams for CVD diamond deposition from halogen-containing gas phase

1999 ◽  
Vol 342 (1-2) ◽  
pp. 42-46 ◽  
Author(s):  
Zhi-Jie Liu ◽  
David Wei Zhang ◽  
Jian-Yun Zhang ◽  
Yong-Zhong Wan ◽  
Ji-Tao Wang
Keyword(s):  
Phase Diagrams ◽  
Gas Phase ◽  
Cvd Diamond ◽  
Diamond Deposition

Contact angles and hysteresis, with some reference to flotation research

1977 ◽  
Vol 30 (1) ◽  
pp. 205 ◽  
Author(s):  
IW Wark
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Gas Phase ◽  
Water Vapour ◽  
Relative Motion ◽  
Solid Surface ◽  
Contact Angles ◽  
Russian School ◽  
Angle Measurements ◽  
Contact Angle Measurements

A technique used in flotation research for contact angle measurements is recommended for wider use. The effect of one aspect of surface roughness on the relative motion of fluid/solid systems is discussed. The function of the water vapour present in the gas phase adjacent to the line of triple contact is examined. A claim of the Russian school of surface chemists is questioned, namely, that a discrete film of water on the solid surface invariably dominates both hysteresis and contact angle.

scholarly journals The interaction of vapour molecules with a crystal surface

1937 ◽  
Vol 161 (904) ◽  
pp. 68-79 ◽  
Keyword(s):  
Gas Phase ◽  
Solid Surface ◽  
Crystal Surface ◽  
Crystal Surfaces ◽  
Early Evidence ◽  
Gas Molecules ◽  
Special Case ◽  
Vapour Molecule

When a gas or vapour molecule strikes a solid surface it may either condense on the surface and remain there for some time before returning to the gas phase, or it may rebound at once from the surface. The ratio of the number of molecules condensing on any surface per second to the total number incident on that surface per second may be defined as the “coefficient of condensation” f . The value of this coefficient will be expected to vary with the nature of the solid surface and of the gas but in a number of cases (Langmuir 1916) early evidence indicated that it is close to unity and it has sometimes been assumed that this is always so. The experiments described in the present paper were designed to test the correctness of this assumption, and for this purpose the coefficient of condensation has been measured at a number of crystal surfaces. The measurement can be made very directly in the special case in which the solid and the gas molecules are identical in nature, and for this reason crystals which sublime at ordinary temperatures have been used and f has been measured for the collisions of the vapour molecules with a solid surface of the same substance.

Study of diamond growth from a variety of input gases

1995 ◽  
Vol 10 (5) ◽  
pp. 1108-1114 ◽  
Author(s):  
K.L. Menningen ◽  
C.J. Erickson ◽  
M.A. Childs ◽  
L.W. Anderson ◽  
J.E. Lawler
Keyword(s):  
Gas Phase ◽  
Surface Condition ◽  
High Sensitivity ◽  
Crystal Growth Rate ◽  
Diamond Growth ◽  
Gas Phase Reactions ◽  
Diamond Deposition ◽  
Hydrogen Dissociation ◽  
Hot Filament ◽  
Filament Surface

The gas phase densities of CH3 and CH and the hydrogen dissociation fraction are measured in a hot filament diamond deposition system for each of several different hydrocarbon input gases. The crystal growth rate and the appearance of the diamond grown from the different input gases are also examined. A comparison of the measurements indicates that the nature of the input hydrocarbon is relatively unimportant because fast gas phase reactions completely scramble the identities of the input carbon atoms. The addition of oxygen greatly alters the gas phase densities and other experimental factors such as the filament surface condition. Small concentrations of atomic impurities in the gas phase are also detected using high sensitivity absorption spectroscopy.

Investigations of the gas phase mechanism of diamond deposition in combustion CVD

2000 ◽  
Vol 368 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Katharina Kohse-Höinghaus ◽  
Astrid Löwe ◽  
Burak Atakan
Keyword(s):  
Gas Phase ◽  
Diamond Deposition
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