Investigation of the micropolarity in reverse micelles of nonionic poly(ethylene oxide) surfactants using 4-nitropyridine-N-oxide as absorption probe

The thermochromism of the ET(30) betaine in a micro-heterogeneous medium: A spectral and dynamics simulation study

“…Examples of this are given in the Supplementary material, where critical micellar concentrations at various temperatures are listed for each of the three poloxamers. This and the observation that the micellization temperature also depended on the polymer structure (see Table 1) were in agreement with previous studies [16,22,[24][25][26]45].…”

“…The temperature-dependent formation of polymeric micelles in water is well-documented, and has been studied with a variety of techniques [16][17][18][19][20][21]. Among them, various research groups have employed dyes and fluorescent probes for the study of the micellization process and for assessing the polarity of the heterogeneous microenvironment of these surfactant solutions [22][23][24][25][26][27][28].…”

Imidazole derivatives as absorption probes for pluronics core-shell aggregates micropolarity investigation

“…The size, shape, and kinetics of the aggregate formation are concentration-and temperature-dependent [9,10,23,24]. As the PPO core may contain some PEO and water, the interface between core and shell regions is not as distinct as in the case of the surfactant micelles in aqueous solution [9,10,22,23].Molecular probes (especially fluorescence probes) have been used by us to characterize nonionic poly(oxyethylenic) surfactant micelles [25][26][27][28][29] and polymeric micelles [30] and to study interactions of poly(oxyethylenic) surfactants with PEO [31], poly(acrylic acid) [32], and globular proteins [33]. The micropolarity variation in reverse micelles (RM) of nonionic PEO surfactants of the alkyl ether type (Brij 30), alkyl-aryl ethers (Triton X-100), and of Pluronics L62, L64, P123, and F127 copolymers has been studied using a UV-vis absorption probe, 4-nitropyridine-Noxide (NP) [29,34,35].…”

“…Molecular probes (especially fluorescence probes) have been used by us to characterize nonionic poly(oxyethylenic) surfactant micelles [25][26][27][28][29] and polymeric micelles [30] and to study interactions of poly(oxyethylenic) surfactants with PEO [31], poly(acrylic acid) [32], and globular proteins [33]. The micropolarity variation in reverse micelles (RM) of nonionic PEO surfactants of the alkyl ether type (Brij 30), alkyl-aryl ethers (Triton X-100), and of Pluronics L62, L64, P123, and F127 copolymers has been studied using a UV-vis absorption probe, 4-nitropyridine-Noxide (NP) [29,34,35].…”

“…The micropolarity variation in reverse micelles (RM) of nonionic PEO surfactants of the alkyl ether type (Brij 30), alkyl-aryl ethers (Triton X-100), and of Pluronics L62, L64, P123, and F127 copolymers has been studied using a UV-vis absorption probe, 4-nitropyridine-Noxide (NP) [29,34,35]. In our previous article, the micropolarity and order in the RM of L62 and L64 in o-xylene…”