Adsorption of Alkyltrimethylammonium Bromide and Alkylpyridinium Chloride Surfactant Series on Polytetrafluoroethylene Powder

Effect of Electrolyte Solutions on the Adsorption of Surfactants at PTFE−Water Interface

“…In summary, we conclude SDBS isotherm follows mainly Langmuir type isothem and the similar fitting with Freundlich type model may be due to a small experimental error in the isotherm. The formation of hemimicelle on PTFE surface by the cationic surfactant (CTAB) is also reported by Dixit et al and Vanjara and Dixtit, with an aggregation number 7. For the isotherms with hemimicelle formation at low surfactant concentration, amount adsorbed increases with the concentration and reaches an intermediate plateau reagion due to the saturation of monolayer, then with further increases in concentration there is a sudden rise in amount adsorbed due to the formation of hemimicelle.…”

“…Surfactant adsorption studies on polymer surfaces are mainly reported at PTFE, − polystyrene, ,− polyvinyltoluene (PVT), and PMMA surfaces. Dixit and co-workers studied single cationic surfactants and cationic−nonionic mixed surfactants systems on PTFE surface. , In a single cationic surfactant system they have studied the effects of chain length of alkyltrimethyl ammonium bromide and pyridinium chloride surfactants. The isotherm consisted of two plateau regions due to formation of hemimicelle.…”

“…Surfactant adsorption studies on polymer surfaces are mainly reported at PTFE, [11][12][13][14][15] polystyrene, 2, [16][17][18][19] polyvinyltoluene (PVT), 20 and PMMA 21 surfaces. Dixit and co-workers studied single cationic surfactants 14 and cationic-nonionic mixed surfactants systems on PTFE surface.…”

A review on experimental studies of surfactant adsorption at the hydrophilic solid–water interface

“…These surface aggregates are known as 'hemimicelles' [52]; which from beyond a critical concentration below the CMC, and is known as critical hemimicellar concentration (HMC). Hemimicellization was first hypothesized (for the adsorption of dodecylammonium ions on quartz) by Gaudin and Ferstenau [52]; later by others [35,36,41,51,53,71,72]. They have mentioned that the forces causing ionic association on the solid surface will be same as those operating in the bulk.…”

Coadsorption of Cationic–Nonionic Surfactant Mixtures on Polytetra Fluoroethylene (PTFE) Surface

“…The adsorption isotherms of CTAB ization of the same PTFE powder is described in more from the mixtures of different binary surfactant systems at detail elsewhere ( 12 ) . different compositions are shown in Figs.…”