Kinetics and role of C, O, and OH in low-pressure nanocrystalline diamond growth

2000 ◽  
Vol 87 (9) ◽  
pp. 4572-4579 ◽  
Author(s):  
Kungen Teii ◽  
Haruhiko Ito ◽  
Masaru Hori ◽  
Takashi Takeo ◽  
Toshio Goto
Keyword(s):  
Low Pressure ◽  
Nanocrystalline Diamond ◽  
Diamond Growth

Diamond growth on thin Ti wafers via chemical vapor deposition

1995 ◽  
Vol 10 (11) ◽  
pp. 2685-2688 ◽  
Author(s):  
Qijin Chen ◽  
Zhangda Lin
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Titanium Substrate ◽  
Chemical Vapor ◽  
Low Pressure ◽  
Diamond Growth ◽  
X Ray ◽  
Hot Filament ◽  
Insight Into

Diamond film was synthesized on thin Ti wafers (as thin as 40 μm) via hot filament chemical vapor deposition (HFCVD). The hydrogen embrittlement of the titanium substrate and the formation of a thick TiC interlayer were suppressed. A very low pressure (133 Pa) was employed to achieve high-density rapid nucleation and thus to suppress the formation of TiC. Oxygen was added to source gases to lower the growth temperature and therefore to slow down the hydrogenation of the thin Ti substrate. The role of the very low pressure during nucleation is discussed, providing insight into the nucleation mechanism of diamond on a titanium substrate. The as-grown diamond films were characterized by scanning electron microscopy (SEM), Raman spectroscopy, and x-ray analysis.

scholarly journals The role of C2 in nanocrystalline diamond growth

2004 ◽  
Vol 96 (11) ◽  
pp. 6724-6732 ◽  
Author(s):  
J. R. Rabeau ◽  
P. John ◽  
J. I.B. Wilson ◽  
Y. Fan
Keyword(s):  
Nanocrystalline Diamond ◽  
Diamond Growth

Role of the plasma composition at the surface on diamond growth

1998 ◽  
Vol 08 (PR7) ◽  
pp. Pr7-391-Pr7-399 ◽  
Author(s):  
S. Farhat ◽  
C. Findeling ◽  
F. Silva ◽  
K. Hassouni ◽  
A. Gicquel
Keyword(s):  
Diamond Growth ◽  
Plasma Composition

Biofouling by ultra-low pressure filtration of surface water: The paramount role of initial available biopolymers

2021 ◽  
Vol 640 ◽  
pp. 119740
Author(s):  
Li Zhang ◽  
Nigel Graham ◽  
Nicolas Derlon ◽  
Youneng Tang ◽  
Muhammad Saboor Siddique ◽  
...  
Keyword(s):  
Surface Water ◽  
Low Pressure ◽  
Pressure Filtration

Role of adenosine in coronary autoregulation

1986 ◽  
Vol 250 (4) ◽  
pp. H558-H566 ◽  
Author(s):  
F. L. Hanley ◽  
M. T. Grattan ◽  
M. B. Stevens ◽  
J. I. Hoffman
Keyword(s):  
Steady State ◽  
Adenosine Deaminase ◽  
Low Pressure ◽  
Catalytic Subunit ◽  
Coronary Resistance ◽  
Pressure Flow ◽  
Intracoronary Infusion ◽  
Adenosine Concentration ◽  
Anesthetized Dogs

The role of cardiac interstitial adenosine as an important metabolite in coronary autoregulation has not been established. We therefore measured steady-state cardiac interstitial adenosine concentration at a high and a low coronary inflow pressure using an epicardial diffusion well in anesthetized dogs. Although coronary resistance for the high and low pressure points showed highly significant differences (P less than 0.001), adenosine averaged 302 +/- 98 and 286 +/- 91 (SD) pmol/ml for the high and low pressure points, respectively (P greater than 0.20). Cardiac interstitial adenosine concentration was then measured with and without an intracoronary infusion of adenosine deaminase catalytic subunit. Adenosine averaged 28 +/- 21 (SD) pmol/ml during the infusion compared with 281 +/- 68 during control conditions (P less than 0.001). Finally, pressure-flow relations were obtained with and without the adenosine deaminase infusion, and there was no loss of autoregulation in the pressure of adenosine deaminase. These findings indicate that intracoronary adenosine deaminase markedly reduces interstitial adenosine concentration, that cardiac interstitial adenosine concentration remains constant during autoregulation, and that the coronary bed autoregulates normally when interstitial adenosine is reduced to levels close to zero. We conclude that cardiac interstitial adenosine concentration is not an important component in coronary autoregulation.

Nucleation Enhancement of Nanocrystalline Diamond Growth at Low Substrate Temperatures by Adamantane Seeding

2010 ◽  
Vol 114 (9) ◽  
pp. 3822-3824 ◽  
Author(s):  
K. Tsugawa ◽  
M. Ishihara ◽  
J. Kim ◽  
Y. Koga ◽  
M. Hasegawa
Keyword(s):  
Nanocrystalline Diamond ◽  
Diamond Growth ◽  
Substrate Temperatures

scholarly journals Engineering quantum-coherent defects: The role of substrate miscut in chemical vapor deposition diamond growth

2020 ◽  
Vol 117 (19) ◽  
pp. 194001
Author(s):  
Simon A. Meynell ◽  
Claire A. McLellan ◽  
Lillian B. Hughes ◽  
Wenbo Wang ◽  
Tom E. Mates ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Diamond Growth ◽  
Chemical Vapor Deposition Diamond
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