MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Synthesis, surface properties, and biological activity
of some cationic surfactant complexes
Ahmed I. Adawya, Mohammed A. Abbasb, and Khaled Zakariac
aSurfactants Laboratory, Petrochemicals Department, Egyptian Petroleum Research Institute (EPRI),
b
Cairo, Egypt; Petroleum Applications Department, Egyptian Petroleum Research Institute (EPRI), Cairo,
c
Egypt; Analysis and Evaluation Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt
KEYWORDS
ABSTRACT
Biological action; metal-
surfactants; sur-
face parameters
Various surfactants were designed in this analysis by esterification of
triethanol amine with dodecanoic acid then quaternized through
benzyl bromide then complexed with hydrated cobalt chloride to
produce metallocationic surfactants. Characterization of the designed
surfactants by FTIR, microelemental analysis, and atomic absorption
spectroscopy was done. Surface tension at four different tempera-
tures was examined, and the surface criteria were considered which
showed high surface action for the designed complexes. Free energy
of micellization (DGomic) and adsorption (DGoads) were investigated.
The germicidal action was checked in opposition to different micro-
organisms, and the results indicated that the designed complexes
have high biological action.
1. Introduction
Surfactants are among the most widely recognized substance items. Surfactants com-
posed of a hydrophilic moiety joined to a huge hydrophobic moiety. Normally, the
hydrophobic moiety is an alkyl bunch in the company of at any rate eight CH2 units.
The head gathering is either cationic, anionic, zwitterionic, or nonionic [1, 2].
Surfactants are utilized in huge amounts each day on an overall scale as constituents of
a wide range of items. Specifically, quaternary ammonium cationic surfactants can be
utilized as elements of cosmetic items [3] in emulsion polymerization [4], in textile han-
dling [5], and so on. They can likewise be utilized in medication as gene delivery spe-
cialists [6]. It is necessary to create new compounds required to upgrade the
physicochemical and medicinal capability of cationic surfactants, beside the special tech-
nologies of them in current development. To date, a large number of ammonium qua-
ternary surfactants (QAS) are being produced with new chemical constructs. Cationic
dynamic biocides have been the most generally utilized ones inferable from their perfect
cell film infiltration characteristics, low danger, great natural steadiness, non-bothering,
low destructiveness and expanded home time, and biological performance in examin-
ation with other antimicrobial operators [7, 8]. For many of such cationic surfactants,
QAS seem to be notable mixtures, in which active germicidal operators are being
CONTACT Ahmed Ibrahim Adawy
Surfactants Laboratory, Petrochemicals
Department, Egyptian Petroleum Research Institute (EPRI), 11727 Cairo, Egypt.
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