Tetra(iso-hexyl)ammonium Bromide—The Most Powerful Quaternary Ammonium-Based Tetrahydrofuran Crystal Growth Inhibitor and Synergist with Polyvinylcaprolactam Kinetic Gas Hydrate Inhibitor

2012 ◽  
Vol 26 (2) ◽  
pp. 1160-1168 ◽  
Author(s):  
Pei Cheng Chua ◽  
Malcolm A. Kelland
Keyword(s):  
Crystal Growth ◽  
Gas Hydrate ◽  
Quaternary Ammonium ◽  
Growth Inhibitor ◽  
Ammonium Bromide

Alkyl-chain disorder in tetraisohexylammonium bromide

2012 ◽  
Vol 68 (4) ◽  
pp. o152-o155 ◽  
Author(s):  
Malcolm A. Kelland ◽  
Amber L. Thompson
Keyword(s):  
Crystal Structure ◽  
Crystal Growth ◽  
Alkyl Chain ◽  
Growth Inhibitor ◽  
Ammonium Cation ◽  
Asymmetric Unit ◽  
Bromide Anion ◽  
Alkyl Chains ◽  
Hydrate Crystal ◽  
Structure Ii Clathrate Hydrate

Tetraisohexylammonium bromide [systematic name: tetrakis(4-methylpentyl)azanium bromide], C24H52N+·Br−, is a powerful structure II clathrate hydrate crystal-growth inhibitor. The crystal structure, in the space groupP3221, contains one ammonium cation and one bromide anion in the asymmetric unit, both on general positions. At 100 K, the ammonium cation exhibits one ordered isohexyl chain and three disordered isohexyl chains. At 250 K, all four isohexyl chains are disordered. In an effort to reduce the disorder in the alkyl chains, the crystal was thermally cycled, but the disorder remained, indicating that it is dynamic in nature.

Identification of a macromolecular crystal growth inhibitor in human urine as osteopontin

1995 ◽  
Vol 23 (5) ◽  
pp. 327-334 ◽  
Author(s):  
S. S�rensen ◽  
S. J. Justesen ◽  
A. H. Johnsen
Keyword(s):  
Crystal Growth ◽  
Human Urine ◽  
Growth Inhibitor

Effects of annealing on mixture-cast membranes of Nafion® and quaternary ammonium bromide salts

2003 ◽  
Vol 213 (1-2) ◽  
pp. 55-66 ◽  
Author(s):  
Trisha J. Thomas ◽  
Karthik E. Ponnusamy ◽  
Nancy M. Chang ◽  
Kim Galmore ◽  
Shelley D. Minteer
Keyword(s):  
Quaternary Ammonium ◽  
Ammonium Bromide
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