Thermal Dissociation of Hydrogen

1964 ◽  
Vol 40 (9) ◽  
pp. 2639-2652 ◽  
Author(s):  
George E. Moore ◽  
F. C. Unterwald
Keyword(s):  
Thermal Dissociation

Thermal dissociation in the psychrophilic yeastCandida curiosa

1980 ◽  
Vol 20 (7) ◽  
pp. 471-474 ◽  
Author(s):  
M. Vidal-Leiria ◽  
N. Van Uden
Keyword(s):  
Thermal Dissociation

Kinetic studies on the thermal dissociation of β-cyclodextrin—benzyl alcohol inclusion complex

1994 ◽  
Vol 235 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Ning Zhang ◽  
Jing-Hua Li ◽  
Qing-Tang Cheng ◽  
Ming-Wei Zhu
Keyword(s):  
Inclusion Complex ◽  
Benzyl Alcohol ◽  
Thermal Dissociation ◽  
Kinetic Studies

THE THERMAL DISSOCIATION OF CALCIUM HYDRIDE

1931 ◽  
Vol 53 (5) ◽  
pp. 1681-1689 ◽  
Author(s):  
Charles B. Hurd ◽  
Kenneth E. Walker
Keyword(s):  
Thermal Dissociation ◽  
Calcium Hydride

Dissociation and Subsidence of Hydrated Sediment: Coupled Models

2009 ◽  
Vol 27 (2) ◽  
pp. 105-131 ◽  
Author(s):  
Mohamed Iqbal Pallipurath
Keyword(s):  
Thermal Dissociation ◽  
Hydrate Formation ◽  
Coupled Models ◽  
Two Phase ◽  
Strength Deterioration ◽  
Intrinsic Kinetics ◽  
Radial Heat Flow ◽  
Radial Heat ◽  
Definition Of ◽  
Pressure Changes

Thermal dissociation of hydrated sediment by a pumped hot fluid is modeled. A radial heat flow from the hot pipe is assumed. The coordinate system is cylindrical. Three components (hydrate, methane and water) and three phases (hydrate, gas, and aqueous-phase) are considered in the simulator. The intrinsic kinetics of hydrate formation or dissociation is considered using the Kim-Bishnoi model. Mass transport, including two-phase flow, molecular diffusions and heat transfer involved in formation or dissociation of hydrates are included in the governing equations, which are discretized with finite volume difference method and are solved in an explicit manner. The strength deterioration of the hydrate bed as a result of dissociation is investigated with a geo-mechanical model. The way in which dissociation affects the bed strength is determined by plugging in the porosity and saturation change as a result of dissociation into the sediment collapse equations. A mechanism to measure the pore pressure changes occurring due to dissociation is developed. The rate of collapse as dissociation proceeds is determined and the model thus enables the definition of a safety envelope for gas hydrate drilling.

Sequence of phase equilibrium states in the Dy-Mn-O system during thermal dissociation of the DyMn2O5 compound

2006 ◽  
Vol 32 (2) ◽  
pp. 234-237
Author(s):  
L. B. Vedmid’ ◽  
V. F. Balakirev ◽  
A. M. Yankin ◽  
Yu. V. Golikov
Keyword(s):  
Phase Equilibrium ◽  
Thermal Dissociation ◽  
Equilibrium States

Nuclear Recoil Reactions in Organo-Manganese Compounds. V. —Mn(CO)5 Target Compounds

1971 ◽  
Vol 49 (12) ◽  
pp. 2175-2178 ◽  
Author(s):  
H. Jakubinek ◽  
S. C. Srinivasan ◽  
D. R. Wiles
Keyword(s):  
Thermal Dissociation ◽  
Nuclear Recoil ◽  
Radical Reactions ◽  
High Yield ◽  
Target Molecule ◽  
Product Spectrum ◽  
Rapid Exchange ◽  
Manganese Compounds ◽  
Very High

HMn(CO)5, DMn(CO)5, CH3Mn(CO)5, and C6H5Mn(CO)5 have been irradiated with neutrons and the product spectrum of 56Mn-containing molecules determined. The results show that H56Mn(CO)5 is formed in all cases: 21.0%, 23.6% from HMn(CO)5 and DMn(CO)5 targets, respectively, and 6.9% and 2.1% from CH3Mn(CO)5 and C6H5Mn(CO)5, respectively. Thus the yields are not in accord with the number of H atoms per target molecule. Preliminary experiments show that •*Mn(CO)5 exchanges rapidly with HMn(CO)5 and DMn(CO)5 and very slowly with CH3Mn(CO)5 and C6H5Mn(CO)5. It is deduced that the very high yield of H56Mn(CO)5 in HMn(CO)5 and DMn(CO)5 targets could arise from the rapid exchange, while the lower yields of H56Mn(CO)5 in other targets must likely come from radical reactions following thermal dissociation of the target molecule.

Hydrogen Release and Si-N Bond-Healing Infrared Study of Rapid Thermal Annealed Amorphous Silicon Nitride Thin Films

1995 ◽  
Vol 398 ◽  
Author(s):  
P. Santos-Filho ◽  
G. Stevens ◽  
Z. Lu ◽  
K. Koh ◽  
G. Lucovsky
Keyword(s):  
Silicon Nitride ◽  
Amorphous Silicon ◽  
Gas Flow ◽  
Structural Changes ◽  
Thermal Dissociation ◽  
Chemical Vapor ◽  
Hydrogen Release ◽  
Ex Situ ◽  
Infrared Study ◽  
Amorphous Silicon Nitride

ABSTRACTWe address aspects of hydrogen bonding and its thermal evolution in amorphous Silicon nitride films grown by Remote Plasma Enhanced Chemical Vapor Deposition (RPECVD) from SiH4 and NH3 (or ND3) source gases. Rapid Thermal Annealing (RTA) decreases the Si-H(D) and SiN-H(D) bond populations. The hydrogen bonds break, and H2 (HD, D2) forms and evolves from the film with the heat treatment. This molecular hydrogen release is accompanied by Si- and N- bond healing as detected by a SiN infra red stretch mode signal gain. The ex-situ RTA experiment temperatures ranged from 400 °C to 1200 °C, in 100 °C steps and the film structural changes were monitored by Fourier Transform Infrared spectroscopy (FTIR) after each incremental anneal. Gas flow ratios R=NH3/SiH4 > 2 produced films in which SiN-H(D) bonds dissociated, and a gas desorption rate equation estimated an activation energy barrier of Ea = 0.3 eV. The release of hydrogen from the films in the form of H2 (D2) and ammonia radicals was detected by mass spectrometry and is shown here. The re-bonding of nitrogen to silicon upon thermal dissociation of hydrogen's is consistent with the improvement of the electrical properties of a-SiN:H films following RTA treatment.

scholarly journals Direct Profiling of Environmental Microbial Populations by Thermal Dissociation Analysis of Native rRNAs Hybridized to Oligonucleotide Microarrays

2003 ◽  
Vol 69 (4) ◽  
pp. 2377-2382 ◽  
Author(s):  
Said El Fantroussi ◽  
Hidetoshi Urakawa ◽  
Anne E. Bernhard ◽  
John J. Kelly ◽  
Peter A. Noble ◽  
...  
Keyword(s):  
Thermal Dissociation ◽  
Pcr Amplification ◽  
Estuarine Sediments ◽  
Microbial Populations ◽  
Oligonucleotide Microarrays ◽  
Dissociation Curve ◽  
Melting Profile ◽  
Probe Target ◽  
Study Sites

ABSTRACT Oligonucleotide microarrays were used to profile directly extracted rRNA from environmental microbial populations without PCR amplification. In our initial inspection of two distinct estuarine study sites, the hybridization patterns were reproducible and varied between estuarine sediments of differing salinities. The determination of a thermal dissociation curve (i.e., melting profile) for each probe-target duplex provided information on hybridization specificity, which is essential for confirming adequate discrimination between target and nontarget sequences.

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