改性纳米纤维素稳定Pickering乳液制备与性能的研究

以聚二甲基硅氧烷（PDMS）疏水改性油茶籽壳纳米纤维素（CNF），并以该粒子（PDMS-CNF）作为稳定剂，以去离子水为外相，茶籽油为内相，高剪切乳化成功制备了水包油型Pickering乳液，研究了油水比、PDMS-CNF浓度、乳化时间对乳液稳定性、微观形貌和粒径的影响。结果表明：改性油茶籽壳纳米纤维素作为稳定粒子显示出更好的稳定性，利于贮存；乳液为球状液滴，粒径多呈正态分布，随油水比增大，粒径由140nm增加至450nm，随 PDMS-CNF粒子浓度增大，粒径由750nm减小至450nm；乳化时间从2min增加至6min时，乳液粒径逐渐由650nm下降至150nm，而从6min增加至10min时则粒径增大至450nm。

Preparation and Properties of Pickering Emulsion Stabilized by Modified Cellulose

Oil-in-water Pickering emulsion was successfully prepared via high shear emulsification using PDMS-CNF which was hydrophobic modified by PDMS. The effects of oil/water ratio, PDMS-CNF concentration and emulsifying time on emulsion stability, microstructure, and particle size were investigated. PDMS-CNC showed better stability than CNF as stabilizer, which was beneficial to storage. The emulsion existed spherical droplets, and its particle size was Gaussian distributed, which increased with the increase of oil-water ratio, from140nm to 450nm, and decreased with the addition of PDMS-CNF particle concentration, from 750nm to 450nm. As the emulsifying time increased from 2 min to 6min, the particle size of the emulsion decreased gradually, from 650nm to 150nm, while the emulsifying time increased from 6 min to 10 min, the particle size of the emulsion increased to 450nm.