Characterization of micelles of polyoxyethylene nonylphenol (Igepal) and its complexation with 3,7-diamino-2,8-dimethyl- 5-phenylphenazinium chloride

Evaluation of amylopectin clusters and their interaction with nonionic surfactants

“…Unitol surfactants form micelles preferentially at higher temperatures and the lower oxyethylene content (L-70) has higher driving force to micellization. This result is in agreement with the role of ethylene oxide residues in the micelle formation [30]. Microcalorimetric measurements are under accomplishment in this research group in order to better substantiate the experimental results showed here.…”

“…In this research, the nonionic surfactant source can also make the difference, since there were no previous treatment to purification them. On the other hand, the N for Renex 95 (67) is in close aggrement with the one for polyoxyethylene (5) nonylphenol ether (72) [30].…”

“…Polyoxyethylene (9.5) nonylphenol ether (Renex 95) determined cmc is 0.14 mmol/L, while in literature, the cmc of 0.47 mmol/L was reported for polyoxyethylene (5) nonylphenol ether [30], and 0.072 mmol/L was found for polyoxyethylene (9) nonylphenol ether by isothermal titration calorimetry [31]. The difference between these values is probably due to the polyoxyethylene chain length distribution, and the surfactant purity degree.…”

Interaction of charge transfer fluorescence probe with non-ionic surfactants: Estimation of physico-chemical properties and association constant

“…Some of the relatively recent literatures are available for monitoring the micellization process of these surfactant systems with fluorescence, as well as other related techniques, using probes like safranine-T, 1-anthracene sulphonate, pyrene-1-carboxaldehyde, benzimidazole derivatives etc. to report their cmc [10][11][12][13][14] and also the local polarity parameters [15][16][17][18][19]. Ideally, when using a fluorescent probe molecule, one assumes that it should not perturb the system significantly in spite of being extremely sensitive to the environment where it is located within the aggregate.…”

“…Ideally, when using a fluorescent probe molecule, one assumes that it should not perturb the system significantly in spite of being extremely sensitive to the environment where it is located within the aggregate. However, the most widely studied system safranine-T is itself a cationic species and known to form 1:1 intermolecular charge transfer complex with Tween and Igepal series surfactants [15]. As the micellar structure often critically depends on the interfacial potential, characterization of the non-ionic micelles with diffusive charged species like safranine-T might be erroneous.…”