This study introduces a new type of Pickering emulsion system with enhanced UV-blocking and water-resisting performance, in which hydrophobically modified ZnO composite cellulose nanofibers (HCNF_ZnO) were employed to form an oil-in-water (O/W) interface. For this, we first deposited ZnO nanoparticles (NPs) on CNFs by reducing the zinc precursor and subsequently grafted hexadecyltrimethoxysilane on the ZnO NPs. We observed that the HCNF_ZnO favoured the formation of a fibrillary solid layer at the O/W interface, thus producing a structurally stable Pickering emulsion. The Pickering emulsion showed synergistic UV-blocking performance when prepared with a chemical UV filter in the oil phase. Interestingly, owing to the inter-fibrillary attraction of cellulose bodies, the HCNF_ZnO-armored Pickering emulsion drops adhere to each other, thus exhibiting significant resistance to repeated rinsing with water. These results highlight that our HCNF_ZnO enables the development of a UV-blocking emulsion system with excellent water resistance without the aid of conventional emulsifiers.

这项研究介绍了一种新型的Pickering乳液体系，该体系具有增强的紫外线阻隔性和耐水性，其中疏水改性的ZnO复合纤维素纳米纤维（HCNF _ZnO）被用来形成水包油（O / W）界面。为此，我们首先通过还原锌前体，然后在ZnO NPs上接枝十六烷基三甲氧基硅烷，在CNF上沉积ZnO纳米颗粒（NPs）。我们观察到HCNF _ZnO有利于在O / W界面处形成纤维状固体层，从而产生结构稳定的Pickering乳液。当在油相中用化学UV滤光片制备时，Pickering乳液显示出协同的UV阻隔性能。有趣的是，由于纤维素小体的原纤维间吸引力，HCNF_ZnO铠装的Pickering乳剂滴彼此粘附，因此对反复用水漂洗表现出显着的抵抗力。这些结果表明，我们的HCNF _ZnO无需传统的乳化剂就可以开发出具有优异耐水性的防紫外线乳液体系。