Surface Micellization Patterns of Quaternary Ammonium Surfactants on Mica
نویسندگان
چکیده
The microscopic equilibrium structures of adsorbed films of quaternary ammonium surfactants on mica have been investigated by noncontact atomic force microscopy imaging as a function of alkyl chain length and headgroup structure. Spherical and cylindrical surface micelles were observed; these were found to be related to bulk solution self-assembly and the surfactant packing parameter, v/a0lc. Shape transitions in the surface aggregates were observed on changing the counterion between chloride, bromide, and salicylate.
منابع مشابه
New ester based gemini surfactants: the effect of different cationic headgroups on micellization properties and viscosity of aqueous micellar solution.
A new series of ester functionalized cationic gemini surfactants having different cationic headgroups (i.e. piperidinium, pyrrolidinium, morpholinium and quaternary ammonium) have been synthesized and characterized using NMR and Mass spectroscopy. These new gemini surfactants were investigated for their micellization and viscosity properties using surface tension, conductivity, fluorescence and...
متن کاملSynthesis and Biocidal Activity of Some Naphthalene-Based Cationic Surfactants
In this study, different cationic surfactants were prepared by reacting dodecyl bromide with tertiary amines to produce a series of quaternary ammonium salts that were converted subsequently to stannous and cobalt cationic complexes via complexing them with stannous (II) or cobalt (II) ions. Surface properties such as surface- and interfacial-tension, and the emulsifying power of these surfacta...
متن کاملMikrocalorimetric studies on the interaction of N-dodecyl-N,N-dimethyl-N-benzylammonium halides with phosphatidylcholine bilayers: a counterion effect.
N-dodecyl-N,N-dimethyl-N-benzylammonium halides (DBeAX), like many other amphiphilic quaternary ammonium salts, show biological activity. One of these halides is a major component of "benzalkonium chloride", which is widely used as an antiseptic in pharmaceutical preparations. The mechanism responsible for the antimicrobial action of surfactants is not clearly understood, particularly the role ...
متن کاملConductometric Study of the Thermodynamics of Micellization of Sodium dodecylsulfate (SDS) in the Presence of Some Aromatic Ammonium Salts
The effect of three organic aromatic salts - Phenyltrimethylammonium (PhTMAB), benzyltrimethylammonium (BzTMAB) and benzyltrimethylammonium (BzTEAB) bromides - on the micellization of sodium dodecylsulfate has been investigated by conductometric method. The critical micelle concentration (CMC) values were found to decrease with increase in the concentration of the aromatic ammonium salts. Therm...
متن کاملSynthesis, Micellization and Hemolysis Evaluation of Biodegradable quaternary Ammonium Compounds
Surfactants have the special ability to interact with the lipid bilayer of cell membranes. The red blood cell is one of the most used cellular membrane models to study the mechanisms underlying surfactant – induced osmotic cell resistance.The aim of this study is the evaluation of the effect of the prepared surfactants on red blood cells (RBC) as a model for biological membranes. Also, in this ...
متن کامل