School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China; Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.
J Colloid Interface Sci. 2019 Apr 15;542:144-150. doi: 10.1016/j.jcis.2019.01.080. Epub 2019 Jan 22.
Hollow particles have been used in a variety of applications and many methods have been developed. Hollow particles templated from Pickering emulsions due to nanoparticle adsorption at the oil-water interface usually suffer from the collapsed morphologies and low thermal and solvent stability and enhancement of the shell can significantly improve the hollow particle performance.
This paper reports hollow particles templated from Pickering emulsion droplets in combination with UV photopolymerization. The Pickering emulsions were stabilized by functional silica nanoparticles at the O/W interface and the oil phase contains photosensitive reactants, initiator, catalyst and volatile solvents. The effects of nanoparticles concentration, O/W volume ratio, pH, dispersion speed and time on the stabilization of Pickering emulsion were firstly carried out and the properties of hollow particles formed by traditional interfacial crosslinking and UV photopolymerization were systematically investigated.
Compared with previous interfacial crosslinking method, the UV photopolymerization method gives much more robust shells and we show in the paper that the hollow particles have much higher solvent resistance and thermal stability. The enhancement of thermal stability and solvent resistance of the hollow particle could extend its applications to more harsh fields such as self-healing coatings used in deep sea conditions.
空心粒子已经在各种应用中得到了广泛的应用，并且已经开发了许多方法。由于纳米粒子在油水界面的吸附，由 Pickering 乳液模板化的空心粒子通常会遭受形态坍塌和热稳定性以及溶剂稳定性低的问题，而增强壳层可以显著改善空心粒子的性能。
本文报道了一种通过 Pickering 乳液液滴与紫外光聚合相结合制备空心粒子的方法。Pickering 乳液由功能性二氧化硅纳米粒子在 O/W 界面稳定，油相包含光敏反应物、引发剂、催化剂和挥发性溶剂。首先研究了纳米粒子浓度、O/W 体积比、pH 值、分散速度和时间对 Pickering 乳液稳定性的影响，并系统研究了传统界面交联和紫外光聚合形成的空心粒子的性能。
与以前的界面交联方法相比，紫外光聚合方法得到的壳层更加坚固，我们在论文中表明，空心粒子具有更高的耐溶剂性和热稳定性。空心粒子的热稳定性和耐溶剂性的增强可以将其应用扩展到更苛刻的领域，例如深海条件下使用的自修复涂料。
