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首页> 外文期刊>RSC Advances >Investigation of modified sodium alginate-Alkyl glycoside interactions in aqueous solutions and at the oil–water interface
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Investigation of modified sodium alginate-Alkyl glycoside interactions in aqueous solutions and at the oil–water interface

机译：水溶液和油水界面改性藻酸钠 - 烷基糖苷相互作用的研究

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The interaction of cholesteryl-grafted sodium alginate derivative (CSAD) and decyl-β- D -glucopyranoside (DGP) in solution was studied through the surface tension method, fluorescence spectroscopy, electron paramagnetic resonance (EPR), and dynamic light scattering. Results showed that DGP and CSAD exhibit competitive adsorption behaviour at the water–gas interface and that this competitive behaviour can be intensified by NaCl. EPR revealed that the cholesterol groups of CSAD participate in the formation of micellar structures. The steric effect of the cholesterol groups reduces the microviscosity of the micellar structure, but high-concentration NaCl can weaken the polarity and increase the microviscosity of the formed micellar structure. In addition, at a high DGP concentration, high-concentration NaCl can facilitate DGP precipitation; this condition causes abnormal phenomena of surface tension, fluorescence spectroscopy, and EPR. For the emulsion system, analysis of particle size and rheology indicated that DGP and CSAD form a network structure between oil and water interfaces through interaction and thus enhance the non-Newtonian fluid properties of the emulsion. Owing to the competitive adsorption between CSAD and DGP at the oil–water interface, DGP gradually replaces CSAD with the increase in DGP concentration. With a further increase in DGP concentration, the stable steric effect of polymers between oil drops may disappear, and oil drops may aggregate mutually.
机译：通过表面张力法，荧光光谱，电子顺啮合共振（EPR）和动态光散射研究了胆固醇接枝藻酸钠衍生物（CSAD）和癸基-β-D-葡糖苷（DGP）在溶液中的相互作用。结果表明，DGP和CSAD在水利界面表现出竞争性吸附行为，并且可以通过NACL加剧这种竞争行为。 EPR揭示了CSAD的胆固醇基团参与了胶束结构的形成。胆固醇基团的空间效果降低了胶束结构的微聚体，但高浓度的NaCl可以削弱极性并增加形成的胶束结构的微裂化。另外，在高DGP浓度下，高浓度NaCl可以促进DGP沉淀;这种情况导致表面张力，荧光光谱和EPR的异常现象。对于乳液系统，粒度和流变学分析表明，DGP和CSAD通过相互作用形成油和水界面之间的网络结构，从而提高乳液的非牛顿流体性质。由于CSAD与DGP在油水界面之间的竞争性吸附，DGP随着DGP浓度的增加而逐渐取代CSAD。随着DGP浓度的进一步增加，油滴之间聚合物的稳定空间效果可能消失，油滴可以相互聚集。

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