FSCN, Surface and Colloid Engineering, Mid Sweden University, SE-85170 Sundsvall, Sweden.
MED - Mediterranean Institute for Agriculture, Environment and Development, University of Algarve, Faculty of Sciences and Technology, Campus de Gambelas, Ed. 8, 8005-139 Faro, Portugal.
Carbohydr Polym. 2021 Jan 15;252:117092. doi: 10.1016/j.carbpol.2020.117092. Epub 2020 Sep 15.
Cellulose-based oil-in-water (O/W) emulsions were studied by diffusing wave spectroscopy (DWS) regarding the effect of the cellulose concentration and mixing rate on the average droplet size, microrheological features and stability. Furthermore, the microstructure of these emulsions was imaged by cryo-scanning electron microscopy (cryo-SEM). The micrographs showed that cellulose was effectively adsorbed at the oil-water interface, resembling a film-like shell that protected the oil droplets from coalescing. The non-adsorbed cellulose that was observed in the continuous aqueous medium, contributed to the enhancement of the viscosity of the medium, leading to an improvement in the stability of the overall system. Generally, the higher the cellulose concentration and mixing rate, the smaller the emulsion droplets formed, and the higher was their stability. The combination of both techniques, DWS and cryo-SEM, revealed a very appealing and robust methodology for the characterization and design of novel emulsion-based formulations.
采用扩散波谱学（DWS）研究了基于纤维素的油包水（O/W）乳液，探讨了纤维素浓度和混合速率对平均液滴尺寸、微观流变特性和稳定性的影响。此外，还通过冷冻扫描电子显微镜（cryo-SEM）对这些乳液的微观结构进行了成像。这些乳液的微观照片显示，纤维素有效地吸附在油水界面上，形成类似薄膜的外壳，防止油滴聚结。在连续的水相中观察到的未吸附的纤维素，有助于增强介质的粘度，从而提高整个体系的稳定性。通常，纤维素浓度和混合速率越高，形成的乳液液滴越小，其稳定性越高。DWS 和 cryo-SEM 这两种技术的结合，为新型乳液制剂的表征和设计提供了一种非常有吸引力和稳健的方法。
