Effect of alkyl chain functionalization of ionic liquid surfactants on the complexation and self-assembling behavior of polyampholyte gelatin in aqueous medium

摘要: The complexation behaviour of an imidazolium based ionic liquid surfactant (ILS) 3-methyl-1-dodecylimidazolium chloride, [C12mim][Cl], and its amide ester functionalized counterparts 3-(2-(dodecylamino)-2-oxoethyl)-1-methyl-1H-imidazol-3-ium [C12Amim][Cl], 3-methyl-1-dodecyloxycarbonylmethylimidazolium [C12Emim][Cl], with a model protein gelatin (G) in aqueous solution has been investigated. Complexation G ILSs at the air–solution interface monitored by tensiometry, whereas ILS mediated self-assembly G–ILS complexes bulk have followed dynamic light scattering (DLS), zeta-potential measurements, conductivity, fluorescence techniques. morphology different self-assembled architectures scanning electron microscopy (SEM). Different transitions observed from various techniques concentration regimes assigned to varying extent complexes. functionalization alkyl chain [C12mim][Cl] ([C12Amim][Cl]) or ([C12Emim][Cl]) moiety owing their additional hydrogen bonding (H-bonding) ability along rigidity flexibility near head group found exert great influence on G. This is fashioned as structures into discrete large hexagonal sheet-like spherical architectures, depending type functionality ILSs. thermodynamic forces behind processes isothermal titration calorimetry (ITC) measurements are discussed detail. As both nature (charge structure) could affect interactional behavior, present results expected be very useful deeply understanding structure–property relationship between proteins, which would importance field functional soft-materials.