Eco-Friendly Pickering Emulsion Stabilized by Silica Nanoparticles Dispersed with High-Molecular-Weight Amphiphilic Alginate Derivatives,ACS Sustainable Chemistry & Engineering

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Eco-Friendly Pickering Emulsion Stabilized by Silica Nanoparticles Dispersed with High-Molecular-Weight Amphiphilic Alginate Derivatives
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acssuschemeng.7b04508
Xinyu Zhao ₁ , Gaobo Yu ₁ , Jiacheng Li ₁ , Yuhong Feng ₁ , Lei Zhang ₁ , Yang Peng ₁ , Yiyuan Tang ₁ , Longzheng Wang ₁

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O/W Pickering emulsions formed with silica nanoparticles adsorbed with amphiphilic alginate derivatives produced a longer stability. Ugi-Alg was obtained by a mild and efficient Ugi four-component condensation reaction, and its structure of Ugi-Alg was confirmed by ¹H nuclear magnetic resonance and Fourier transform infrared spectroscopies. Dynamic light scattering and transmission electron microscopy measurements were then performed to characterize the aggregation behavior of SiO₂/Ugi-Alg mixture in aqueous solution. The positioning of the silica particles at the oil–water interface was obtained through confocal laser scanning microscopy. The long-term stability and rheological property of Pickering emulsions stabilized by Ugi-Alg and SiO₂ nanoparticles were respectively investigated by Turbiscan Lab Expert stability analyzer and rotational rheometer. The rheological behaviors of the emulsions were studied and results showed that Ugi-Alg with high molecular weight led to more rigid structures. This trend can be justified by the formation of silica particle strong network attributed to the entanglement and bridging of Ugi-Alg. The results indicated that adjusting the amount of silica nanoparticles and Ugi-Alg molecular-weight could be a suitable means for manipulating stability of polymer–nanoparticles-based Pickering emulsions. This process would be of great application prospect for the preparation of Pickering emulsions stabilized by sustainable polymer surfactant and nanoparticles.

中文翻译：

分散有高分子量两亲藻酸盐衍生物的二氧化硅纳米颗粒稳定的生态友好的Pickering乳液

由吸附有两亲藻酸盐衍生物的二氧化硅纳米颗粒形成的O / W Pickering乳液产生了更长的稳定性。Ugi-Alg是通过温和有效的Ugi四组分缩合反应获得的，其Ugi-Alg的结构已通过¹ H核磁共振和傅里叶变换红外光谱确定。然后进行动态光散射和透射电子显微镜测量，以表征SiO ₂ / Ugi-Alg混合物在水溶液中的聚集行为。二氧化硅颗粒在油水界面的定位是通过共聚焦激光扫描显微镜获得的。Ugi-Alg和SiO ₂稳定的Pickering乳液的长期稳定性和流变性能用Turbiscan Lab Expert稳定性分析仪和旋转流变仪分别研究纳米颗粒。研究了乳液的流变行为，结果表明，高分子量的Ugi-Alg导致更刚性的结构。这种趋势可以通过归因于Ugi-Alg缠结和桥接的二氧化硅颗粒强网络的形成来证明。结果表明，调整二氧化硅纳米粒子的量和Ugi-Alg分子量可能是控制基于聚合物-纳米粒子的Pickering乳液稳定性的合适方法。该方法在制备由可持续的聚合物表面活性剂和纳米颗粒稳定的皮克林乳液中具有很大的应用前景。

更新日期：2018-01-17

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