quaternary ammonium salt

quaternary ammonium salt

[′kwät·ən‚er·ē ə¦mō·nē·əm ′sȯlt]
(organic chemistry)
A nitrogen compound in which a central nitrogen atom is joined to four organic radicals and one acid radical, for example, hexamethonium chloride; used as an emulsifying agent, corrosion inhibitor, and antiseptic.
References in periodicals archive ?
Jiang, "Synergistic corrosion inhibition effect of quinoline quaternary ammonium salt and Gemini surfactant in H2S and CO2 saturated brine solution," Corrosion Science, vol.
Finally, the C2-N[H.sub.2] and N[H.sub.2] on a benzene ring were modified as a quaternary ammonium salt. By this way, we obtained the target chitosan derivatives which were supposed to have ideal water solubility and antimicrobial activity.
Ulaszewski, "The physiological and morphological phenotype of a yeast mutant resistant to the quaternary ammonium salt N(dodecyloxycarboxymethyl)-N,N,N-trimethyl ammonium chloride," Cellular & Molecular Biology Letters, vol.
Quaternary ammonium salt has positive ions that easily combine with anions.
Summary: Melamine and sodium chloroacetate were used as raw materials to synthesize a kind of quaternary ammonium salt (QAS) as potential clay swelling inhibitor and water-based drilling fluid additive, and the reaction conditions were screened based on the linear expansion rate of bentonite.
Note that this peak disappears in QCS-PAA in chitosan derivatives caused by formation of quaternary ammonium salt at C-2 at high wave number.
* US Patent 8,871,700 B2: Procter & Gamble has patented a liquid cleaning and disinfecting composition that is comprised of C12-14 linear alkyl dimethyl amine oxide; a Zn2+ salt selected from the group consisting of Zn carbonate, Zn sulphate, Zn citrate and mixtures thereof; an anionic surfactant selected from the group consisting of alkyl sulfate, alkyl ethoxy sulfate and mixtures thereof; an organic solvent selected from the group consisting of ethanol, benzyl alcohol, and mixtures thereof; and at least one biocide selected from the group consisting of a halogenated benzyl alcohol derivative, a halogenated hydroxy-diphenylether, a quaternary ammonium salt, an alkylbenzethonium chloride, a peroxide bleach system, and mixtures thereof.
As shown in Figure 3, the quaternary ammonium salt was intercalated into the montmorillonite layers on chip by cation exchange, thereby forming composites with the required nanometer-sized spaces.
Briefly, 12.5 g of laterite and bentonite were separately taken in a volumetric flask and were mixed with a solution of quaternary ammonium salt equivalent to the cation exchange capacity (CEC) of the clay (84 cmol/kg of bentonite and 52 cmol/kg of laterite).
Smectite-based organoclays are modified with a quaternary ammonium salt which facilitates compatibility with a variety of organic solvent systems.
The herbicide solution for Enlist is based on the innovative choline salt of 2,4-D, a quaternary ammonium salt which is different from 2,4-D amine or ester formulations.
The use of choline chloride, as shown in Figure 5, is interesting because this quaternary ammonium salt forms a liquid with complexing agent in a same phase, making eutectic ILs.

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