Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt

2006 ◽  
Vol 124 (15) ◽  
pp. 154507 ◽  
Author(s):  
E. Tombari ◽  
S. Presto ◽  
G. Salvetti ◽  
G. P. Johari
Keyword(s):  
Heat Capacity ◽  
Clathrate Hydrate ◽  
Clathrate Formation ◽  
Supercooled Melt

Clathrate and other solid phases in the tetrahydrofuran–water system: thermal conductivity and heat capacity under pressure

1982 ◽  
Vol 60 (7) ◽  
pp. 881-892 ◽  
Author(s):  
Russell G. Ross ◽  
Per Andersson
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Water System ◽  
Clathrate Hydrate ◽  
Transient Hot Wire ◽  
Guest Molecules ◽  
Hydrate Phase ◽  
Wire Method ◽  
Solid Phases ◽  
Thermal Conductivity Λ

Solid phases in the tetrahydrofuran–water (THF–H2O) system were investigated in the temperature range 100–260 K and at pressures up to 1.5 GPa. Thermal conductivity, λ, and heat capacity per unit volume, ρcp, were measured, using the transient hot-wire method. We made measurements on solid phases having nominal compositions THF•17H2O, THF•7•1H2O, and THF•4•6H2O, which we refer to as phases α, β, and γ, respectively. Phase α is known to be a structure II clathrate hydrate, and λ for this phase was found to be similar to other crystalline solids which are glass-like in relation to their thermal properties. Low-energy excitations are known to be relevant to the properties of glass-like solids, and, in the case of phase α, were probably rotational vibrations of the THF guest molecules. Phase β was similar, and we inferred that it was probably a structure I clathrate hydrate. Phase γ behaved nearly like a normal crystal phase at low temperatures, but λ became almost independent of temperature near melting. At 1.1 GPa and 130 K, we found evidence that phase α transformed, on pressurization, to a metastable modification which may be a new high-density form of clathrate hydrate. The astrophysical implications of our results were mentioned briefly.

Hydrogen sulfide clathrate hydrate FTIR spectroscopy: A help gas for clathrate formation in the Solar System?

Icarus ◽  
2012 ◽  
Vol 220 (2) ◽  
pp. 427-434 ◽  
Author(s):  
E. Dartois ◽  
Ph. Duret ◽  
U. Marboeuf ◽  
B. Schmitt
Keyword(s):  
Hydrogen Sulfide ◽  
Solar System ◽  
Ftir Spectroscopy ◽  
Clathrate Hydrate ◽  
Clathrate Formation

Clathrate Formation in the Water–Tetraisoamylammonium Propionate System: X-ray Structural Analysis of the Clathrate Hydrate (i-C5H11)4NC2H5CO2·36H2O

2006 ◽  
Vol 56 (3-4) ◽  
pp. 331-335 ◽  
Author(s):  
Kinga Suwinska ◽  
Janusz S. Lipkowski ◽  
Yuri A. Dyadin ◽  
V.Yu. Komarov ◽  
Irina S. Terekhova ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Clathrate Hydrate ◽  
Clathrate Formation ◽  
X Ray

Heat capacity and glass transition of ethylene oxide clathrate hydrate

1990 ◽  
Vol 8 (1-2) ◽  
pp. 45-58 ◽  
Author(s):  
O. Yamamuro ◽  
Y. P. Handa ◽  
M. Oguni ◽  
H. Suga
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Ethylene Oxide ◽  
Clathrate Hydrate

Heat capacity and phase transition of acetone clathrate hydrate

1990 ◽  
Vol 73 (4) ◽  
pp. 317-320 ◽  
Author(s):  
Osamu Yamamuro ◽  
Naoyuki Kuratomi ◽  
Takasuke Matsuo ◽  
Hiroshi Suga
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Clathrate Hydrate

Heat capacity and phase transition of tetrahydrofuran clathrate hydrate

1987 ◽  
Vol 62 (4) ◽  
pp. 289-292 ◽  
Author(s):  
O. Yamamuro ◽  
M. Oguni ◽  
T. Matsuo ◽  
H. Suga
Keyword(s):  
Phase Transition ◽  
Heat Capacity ◽  
Clathrate Hydrate

Heat capacity and glass transition of acetone clathrate hydrate

1991 ◽  
Vol 23 (5) ◽  
pp. 485-494 ◽  
Author(s):  
N. Kuratomi ◽  
O. Yamamuro ◽  
T. Matsuo ◽  
H. Suga
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Clathrate Hydrate

HEAT CAPACITY MEASUREMENTS ON THE DILUTED ISING SYSTEM Cs3CopZn1-pCl5

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-1008-C1-1009 ◽  
Author(s):  
E. LAGENDIJK ◽  
W. J. HUISKAMP ◽  
P. F. BONGERS
Keyword(s):  
Heat Capacity ◽  
Ising System ◽  
Heat Capacity Measurements
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