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

Surface Modification for Cotton Fiber and its Antimicrobial Characteristics

2011 ◽  
Vol 311-313 ◽  
pp. 2067-2070
Author(s):  
Fei Zhou ◽  
Jing Zheng
Keyword(s):  
Cotton Fiber ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Compound ◽  
Hydroxyl Group ◽  
Ammonium Bromide ◽  
Ammonium Compound ◽  
Gram Positive Bacteria ◽  
Wide Range ◽  
Dimethyl Ammonium ◽  
Ammonium Compounds

Quaternary ammonium compounds, Couple, Cotton fiber, Antibacterial activity. Abstract. a gemini-type quaternary ammonium compound with a hydroxyl group in their spacer chain, 4,5-bis(dodecyl dimethyl ammonium bromide)-1-pentanol (called as DAP12), was immobilized on the surface of cotton fiber by using a silane coupler, tetraethoxysilane and a novel antibacterial cotton fiber (called as CF12) was prepared. Antibacterial characteristics of CF12 were investigated comparatively with [3-(trimethoxysilyl) propyl] octadecyldimethylammonium chloride(TPOAC), a mono-type quaternary ammonium salt. CF12 had excellent antibacterial characteristics in the wide range of environmental pH and temperature, which is not weakened even if 30 times repetitive use. The experimental results indicated also that CF12 has higher antimicrobial activity than TPOAC immobilized on the surface of cotton fiber against a broad range of microorganisms, and average inhibition ratio against 15 strains of gram-negative, gram-positive bacteria and yeasts is 99.0% at 30 °C and pH 6.0.

SALTING-IN BY QUATERNARY AMMONIUM SALTS

1965 ◽  
Vol 43 (12) ◽  
pp. 3232-3237 ◽  
Author(s):  
J. E. Desnoyers ◽  
G. E. Pelletier ◽  
C. Jolicoeur
Keyword(s):  
Quaternary Ammonium ◽  
Alkyl Group ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Smooth Transition ◽  
Ammonium Ion ◽  
Ammonium Bromide ◽  
Structure Of Water ◽  
Organic Ions ◽  
Bromide Solutions

The solubility of benzene in substituted quaternary ammonium bromide solutions has been measured by ultraviolet absorption. The solubility is found to increase in the presence of such salts as R4−nHnN+Br− where R is an alkyl group and n varies between 0 and 3; a smooth transition in behavior is observed when passing from simple salts to long-chained micellar salts. This salting-in can be explained in terms of an association between the nonelectrolyte and the quaternary ammonium ion, which is induced by the increase in the structure of water near large nonpolar groups of the organic ions.

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