共沸蒸馏法制备表面化学改性氢氧化镁纳米颗粒

首次将表面改性剂如硬脂酸、硬脂酸锌或稀土偶联剂加入到传统的共沸蒸馏体系中，使Mg(OH)2纳米颗粒的表面改性和干燥过程同时完成。 通过 XRD、TEM、FT-IR、TG和CAM（接触角测试）等技术手段对样品的结构、形貌和性质进行了表征。 结果表明，表面改性剂不但能够和Mg(OH)2纳米颗粒的表面的OH-离子发生化学反应形成表面修饰层, 减少硬团聚现象，而且还使纳米颗粒表面由亲水性变为疏水性。 另外，对共沸蒸馏法制备表面改性纳米颗粒的机理进行了讨论，为纳米颗粒表面改性提供了一种新思路。

Preparation of Surface Chemical Modified Magnesium Hydroxide Nanoparticles via Azeotropic Distillation Method

In conventional azeotropic distillation process, surface modifiers such as stearic acid(St), zinc stearate(ZnSt) and rare earth coupling agent(WOT) were firstly introduced to realize simultaneous drying and surface modification of Mg(OH)2 nanoparticles(NPs). The structure, morphologies and properties of surface modified Mg(OH)2 NPs were characterized by XRD, TEM, FT-IR, TG, CAM(contact angle measurement). The results indicate that surface modifiers not only react with the exterior hydroxyls of Mg(OH)2 NPs to form surface modified layer via chemical bond to weaken the possibility of hard agglomeration, but also change the surface character of Mg(OH)2 NPs from hydrophilicity to hydrophobicity. In addition, the surface modification mechanism in azeotropic distillation was also discussed. This study provides a novel surface modified route for other nanoparticles.