Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada.
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, T6G 2P5, Canada.
Carbohydr Polym. 2017 Aug 1;169:295-303. doi: 10.1016/j.carbpol.2017.04.024. Epub 2017 Apr 14.
Cellulose nanocrystals are hydrophilic nanomaterials, which limits their applications as interfacial compounds. Herein, we propose using modified wood-based cellulose nanocrystals as Pickering emulsion stabilizer. Wood cellulose was consecutively oxidized and modified with phenyltrimethylammonium chloride to create hydrophobic domains comprised of phenyl groups. These modified oxidized cellulose nanocrystals (m-O-CNCs) were homogeneous/electrostatically stable in water and they can stabilize O/W Pickering emulsions. The dispersed phase volume fraction (DPVF) of the Pickering emulsion was 0.7 at around 1.5g/L, whereas the tween-20 control needed a 13-fold greater concentration to have a similar DPVR. In addition, these m-O-CNC stabilized Pickering emulsions also showed good mechanical and thermal stability against centrifugation and heat, as well as size controllability. In terms of stability, size controllability, surfactant-free status, these m-O-CNCs possess superior and enhanced emulsifying properties. Future research for these new interfacial materials have potential in applications, for personal care, cosmetic and pharmaceutic industries.
纤维素纳米晶体是亲水纳米材料，这限制了它们作为界面化合物的应用。本文提出了使用改性木质纤维素纳米晶体作为 Pickering 乳液稳定剂。木材纤维素经过连续氧化和苯基三甲基氯化铵改性，形成了由苯基组成的疏水性基团。这些改性氧化纤维素纳米晶体（m-O-CNC）在水中均匀/静电稳定，可稳定 O/W Pickering 乳液。Pickering 乳液的分散相体积分数（DPVF）在约 1.5g/L 时为 0.7，而吐温-20 对照样则需要增加 13 倍的浓度才能达到类似的 DPVR。此外，这些 m-O-CNC 稳定的 Pickering 乳液还表现出良好的机械和热稳定性，对离心和加热具有良好的稳定性，以及尺寸可控性。在稳定性、尺寸可控性、无表面活性剂状态方面，这些 m-O-CNC 具有优异的增强乳化性能。这些新型界面材料在个人护理、化妆品和制药行业的应用方面具有很大的研究潜力。
