改性纳米纤维素稳定Pickering乳液制备与性能的研究

Preparation and Properties of Pickering Emulsion Stabilized by Modified Cellulose

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质量浓度、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,利于储存;乳液为球状液滴,粒径多呈正态分布,随油水比增大,粒径由140 nm增加至450 nm,随PDMS-CNF粒子质量浓度增大,粒径由750 nm减小至450 nm;乳化时间从2 min增加至6 min时,乳液粒径逐渐由650 nm下降至150 nm,而从6 min增加至10 min时则粒径增大至450 nm。

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,from 140 nm to 450 nm,and decreased with the addition of PDMS-CNF particle concentration,from 750 nm to 450 nm.As the emulsifying time increased from 2 min to 6 min,the particle size of the emulsion decreased gradually,from 650 nm to 150 nm,while the emulsifying time increased from 6 min to 10 min,the particle size of the emulsion increased to 450 nm.