Determination of diffusion coefficients of carbon dioxide in water between 268 and 473K in a high-pressure capillary optical cell with in situ Raman spectroscopic measurements

2013 ◽  
Vol 115 ◽  
pp. 183-204 ◽  
Author(s):  
Wanjun Lu ◽  
Huirong Guo ◽  
I.M. Chou ◽  
R.C. Burruss ◽  
Lanlan Li
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Diffusion Coefficients ◽  
Optical Cell ◽  
Spectroscopic Measurements ◽  
Raman Spectroscopic ◽  
In Situ Raman

High pressure optical cell for synthesis and in situ Raman spectroscopy of hydrogen clathrate hydrates

2012 ◽  
Vol 83 (11) ◽  
pp. 113101 ◽  
Author(s):  
Milva Celli ◽  
Marco Zoppi ◽  
Mohamed A. S. Zaghloul ◽  
Lorenzo Ulivi
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Clathrate Hydrates ◽  
In Situ Raman Spectroscopy ◽  
Optical Cell ◽  
In Situ Raman

Determination of Diffusion Coefficient of Carbon Dioxide in Polyethylene by the Method of Moments

1993 ◽  
Vol 58 (2) ◽  
pp. 252-258 ◽  
Author(s):  
Jan Jirásek ◽  
Milan Šípek
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Diffusion Coefficient ◽  
Method Of Moments ◽  
Diffusion Coefficients ◽  
Optimization Method ◽  
Diffusion Equations ◽  
High Pressure Polyethylene ◽  
Good Agreement

By using the method of moments, the values of diffusion coefficients of carbon dioxide in high-pressure polyethylene of two different thicknesses were determined at 25 °C. The values of diffusion coefficients determined with the accuracy of about ±3% are in good agreement both with the values obtained by the optimization method, and with the published values determined on the basis of asymptotic solutions of diffusion equations.

High-Pressure Preparation, Crystal Structure, and Properties of RE4B6O15 (RE = Dy, Ho) with an Extension of the “Fundamental Building Block”-Descriptors

2003 ◽  
Vol 58 (4) ◽  
pp. 278-290 ◽  
Author(s):  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
Building Block ◽  
Structure Type ◽  
Structure And Properties ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Fundamental Building Block ◽  
High Pressure High Temperature

High-pressure/high-temperature conditions of 8 GPa and 1000°C were used to synthesizethe new rare earth oxoborates RE4B6O15 (RE = Dy, Ho) in a Walker-type multianvil apparatus.The single crystal X-ray structure determination of Ho4B6O15 revealed the followingdata: C2/c, a = 1164.1(1), b = 436.7(1), c = 1882.5(1) pm, β = 96.71(1)°, Z = 4, R1 = 0.0291, wR2 = 0.0505 (all data). The two isotypic compounds exhibit a new structure type built up from corrugated layers of BO4 tetrahedra. In contrast to all known oxoborates the linkingof the BO4 tetrahedra is partially realized via common edges. Regarding the “fundamentalbuilding block”-concept, we introduce a new descriptor “” for edge-sharing BO4 tetrahedra.Temperature-resolved in situ powder diffraction measurements and IR/Raman-spectroscopicinvestigations on Dy4B6O15 are also reported.

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