Design and interfacial behavior of two series of gemini amphiphiles with different charge positions based on imidazole moiety

Interactions of bovine serum albumin with cationic imidazolium and quaternary ammonium gemini surfactants: Effects of surfactant architecture

“…4C, we can also obtain the conclusion that BSA has a stronger affinity for the gemini surfactants than for their corresponding monomers. As is well known, gemini surfactants have double hydrophobic tails and two polar headgroups [45,46], which may have stronger hydrophobic interactions than that of their corresponding monomers with BSA. The ratio of the first (373 nm) to the third(384 nm) vibrational peaks of monomeric pyrene in the emission spectra, (I 1 /I 3 ), which is defined as ''hydrophobic index'', is sensitive to the polarity of the microenvironment at the site of pyrene molecules [31,33].…”

“…Recent investigations on the interaction of BSA/gemini surfactant [39][40][41][42][43] have revealed that such surfactants interact more efficiently with proteins as compared with conventional single chain surfactants. As a new generation of amphiphilic molecule [39][40][41][42][43][44][45][46], gemini surfactants are characterized by two hydrophobic chains and two polar headgroups covalently linked through a spacer group. Compared with conventional surfactants, they have a number of unique properties [45], such as lower critical micelle concentration (cmc), higher adsorption efficiency, and better wetting property.…”

Spacer-Controlled Aggregation and Surface Morphology of a Selenacarbocyanine Dye on Gemini Monolayers

“…The molecular structures of the amphiphiles and the selenacarbocyanine dye used in this work are shown in Scheme . The synthesis of the gemini amphiphiles is reported elsewhere . The dye was purchased from Nippon Kankosikiso.…”

“…Gemini amphiphiles, consisting of two amphiphiles covalently linked by a spacer between the two headgroups, possess tunable molecular geometry, unique aggregation property in aqueous solution, and superior performance in gene delivery. − So far, most of the research on the gemini amphiphiles has been focused on the solution system although there are some reports on the interfacial film systems. Our group has also reported a series of the work on the interfacial behaviors of the gemini amphiphiles with DNA, water-soluble tetrakis(4-sulfonatophenyl)porphine (TPPS), and polyoxometalate . In this paper, we further extended the work to the control of the aggregation of the dye by the gemini amphiphiles with a continuously changeable spacer.…”

Cationic Gemini surfactant at the air/water interface

“…The mixed monolayer of cationic Gemini surfactant with methylene spacers and sodium dodecyl sulfate was investigated by Wang and Marques [25]. The complex or hybrid films formed by a Gemini amphiphile, a bis-(imidazolium salt) with methylene spacers, with DNA [22], dye [19], inorganic materials [26,27], and TPPS [28] were extensively investigated by Liu and his colleagues. The properties of nonionic Gemini surfactant were studied by Mandal and co-workers [29].…”