High pressure rheometer for in situ formation and characterization of methane hydrates

2012 ◽  
Vol 83 (1) ◽  
pp. 015106 ◽  
Author(s):  
Eric B. Webb ◽  
Patrick J. Rensing ◽  
Carolyn A. Koh ◽  
E. Dendy Sloan ◽  
Amadeu K. Sum ◽  
...  
Keyword(s):  
High Pressure ◽  
Methane Hydrates ◽  
In Situ Formation

Polysulfide Networks. In Situ Formation and Characterization of the Elastomeric Behavior

2007 ◽  
Vol 40 (14) ◽  
pp. 5141-5149 ◽  
Author(s):  
Giona Kilcher ◽  
Lei Wang ◽  
Craig Duckham ◽  
Nicola Tirelli
Keyword(s):  
In Situ Formation

scholarly journals CAAC Boranes. Synthesis and characterization of cyclic (alkyl) (amino) carbene borane complexes from BF3 and BH3

2010 ◽  
Vol 6 ◽  
pp. 709-712 ◽  
Author(s):  
Julien Monot ◽  
Louis Fensterbank ◽  
Max Malacria ◽  
Emmanuel Lacôte ◽  
Steven J Geib ◽  
...  
Keyword(s):  
Silica Gel ◽  
Synthesis And Characterization ◽  
Gel Chromatography ◽  
Nmr Analysis ◽  
X Ray ◽  
X Ray Crystallography ◽  
In Situ Formation ◽  
Silica Gel Chromatography

In situ formation of two cyclic (alkyl) (amino) carbenes (CAACs) followed by addition of BF3•Et2O provided the first two examples of CAAC–BF3 complexes: 1-(2,6-diisopropylphenyl)-3,5,5-trimethyl-3-phenylpyrrolidin-2-ylidene trifluoroborane, and 2-(2,6-diisopropylphenyl)-3,3-dimethyl-2-azaspiro[4.5]decan-1-ylidene trifluoroborane. These CAAC–BF3 complexes are robust compounds that are stable to ambient laboratory conditions and silica gel chromatography. They were characterized by spectroscopy and X-ray crystallography. In contrast, a CAAC complex with borane (BH3) was readily formed in situ according to 1H and 11B NMR analysis, but did not survive the workup conditions. These results set the stage for further studies of the chemistry of CAAC boranes.

In-Situ Formation and Characterization of α-Si3N4 Whiskers from Nano Amorphous Si-N-C Powders

1994 ◽  
Vol 363 ◽  
Author(s):  
Ya-Li Li ◽  
Yong Liang ◽  
Zhuang-Qi Hu
Keyword(s):  
Gas Phase ◽  
Whisker Growth ◽  
Process Conditions ◽  
Phase Reaction ◽  
In Situ Formation ◽  
Amorphous Si ◽  
Xrd Techniques ◽  
Vs Mechanism

Abstractα-Si3N4 whiskers were formed from laser-synthesized nanoscale amorphous Si-N-C powders at 1873K under 1 atm N2. The as-formed whiskers were characterized by TEM, STEM, XRD techniques and the process conditions for the whisker growth were studied. The whiskers exhibit various morphologies such as the long thick straight, the prismatic, the ribbon-like, and knuckled whiskers. The gas phase reaction among N2, SiO, and CO gases leads to Si3N4 whisker growth on the pre-crystallized α-Si3N4 grains by the Vapor-Solid (VS) mechanism along specific crystal planes such as {1101}., which ensures an in-situ formation. No addition of other catalyst and the atomic combination of the elements in the Si-N-C powders ensure a high purity of the whiskers.

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