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/nm². 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，作为皮克林乳液的有希望的稳定剂，纳米纤维素已经引起了广泛的兴趣，特别是在食品，化妆品和制药工业中。在这项工作中，研究了两种具有不同结晶同素异形体的纤维素纳米晶体（分别称为CNCs-I和CNCs-II）作为油水Pickering乳液的稳定剂。分别通过未改性的和丝光化的微晶纤维素（MCC）的硫酸水解制备CNCs。CNCs-I是针状颗粒（长– 200 nm，宽– 16.4 nm），而CNCs-II是呈椭圆形的单个颗粒（长– 18.8 nm，宽– 10.9 nm）。两个CNC器件的表面电荷密度均高于0.1 e / nm ²。与CNCs-II相比，经CNCs-I稳定的Pickering乳液具有更大的乳液比率，两倍的液滴尺寸和更高的稳定性能。结论是，CNCs的结晶同质异形物在Pickering乳液的稳定中起着比CNCs本身形态更重要的作用，并且与CNCs-I相比，CNCS-II并不是Pickering乳液稳定剂的良好选择。