State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; United Lab of Plant Resources Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; United Lab of Plant Resources Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
Carbohydr Polym. 2018 Mar 1;183:303-310. doi: 10.1016/j.carbpol.2017.12.085. Epub 2018 Jan 4.
In recent years, nanocelluloses have attracted a lot of interests as promising stabilizers for Pickering emulsion particularly in food, cosmetics and pharmaceutics industries. In this work, two cellulose nanocrystals (named CNCs-I and CNCs-II) with different crystalline allomorph were investigated as stabilizers for oil-water Pickering emulsion. CNCs were prepared by sulfuric acid hydrolysis of unmodified and mercerized microcrystalline cellulose (MCC), respectively. CNCs-I was needle-like particles (length - 200 nm, width - 16.4 nm), while CNCs-II was individual granules (length - 18.8 nm, width - 10.9 nm) with ellipsoid shapes. Both CNCs had surface charge density higher than 0.1 e/nm. Pickering emulsions stabilized by CNCs-I had larger emulsion ratio, two times smaller droplet size and superior performance of stability than CNCs-II. It is concluded that crystalline allomorph of CNCs played more dominating roles to the stabilization of Pickering emulsion than morphologies of CNCs themselves in this work, and CNCs-II is not the good candidates as stabilizer for Pickering emulsion compared to CNCs-I.
近年来，纳米纤维素作为 Pickering 乳液的有前途的稳定剂引起了人们的极大兴趣，特别是在食品、化妆品和制药行业。在这项工作中，两种具有不同晶型的纤维素纳米晶体（分别命名为 CNCs-I 和 CNCs-II）被用作油水 Pickering 乳液的稳定剂。CNCs 通过未改性和丝光化微晶纤维素（MCC）的硫酸水解制备。CNCs-I 是针状颗粒（长度-200nm，宽度-16.4nm），而 CNCs-II 是具有椭圆形的单个颗粒（长度-18.8nm，宽度-10.9nm）。两种 CNCs 的表面电荷密度均高于 0.1e/nm。由 CNCs-I 稳定的 Pickering 乳液具有更大的乳液比、小两倍的液滴尺寸和更好的稳定性性能，优于 CNCs-II。因此，在这项工作中，与 CNCs 本身的形态相比，CNCs 的晶型对 Pickering 乳液的稳定性起着更主导的作用，并且与 CNCs-I 相比，CNCs-II 并不是 Pickering 乳液的理想稳定剂。
