The results showed that both dialkyl quaternary ammonium salts can restrain the growth of aeromonas hydrophila and flexibacter colnmnaris,and the short one was more effective than the long one while comparing their inhibiting effects to aquatic pathogenic bacteria.

Inhibition effect of several dialkyl quaternary ammonium salts on aquatic pathogenic bacteria was tested by double dilution method in tubes.

Preparation of double alkyl quaternary ammonium salts and studies of their bactericidal performance;

Study on the flocculability of the bentonite modified by different alkyl quaternary ammonium salts;

Organic modification of bentonite by a series of alkyl quaternary ammonium salts are examined through mass-lost and XRD measuring.

Two VES fracturing fluids(FFs) on a chemical pure long chain alkyl ammonium salt,CSAa,are prepared and evaluated for their performance properties.

A new type of citric triesters of tridodecyl triammonium(CTTTA)cationic surfactant was synthesized by citric acid,epoxy chloropropane and dodecyl dimethyl amine.

Viscoelastic surfactant(VES) fracturing fluid of EA-22 which is the type of cationic surfactant of alkylamido quaternary ammonium salt was prepared.