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为了探究固体粒子对乳液的稳定作用,采用L-赖氨酸作为催化剂合成纳米SiO2粒子,并用六甲基二硅胺烷(HMDS)对纳米SiO2粒子进行表面疏水改性,将经过HMDS改性后的纳米SiO2粒子作为稳定剂制备出Pickering乳液。通过粒径分析仪、场发射透射电子显微镜、FTIR、TG-DSC、接触角测量仪、光学显微镜、电导率仪分别对纳米SiO2的制备、表面改性和Pickering乳液的性能进行了表征。结果表明,成功合成出粒径小且形貌均一的硅球,具有疏水性的三甲基硅基成功接枝到纳米SiO2的表面;不同纳米SiO2浓度制备的Pickering乳液,发现随着SiO2浓度的增大,乳液的稳定性逐渐增强,乳液液滴直径呈现减小的趋势;不同油水比制备的Pickering乳液,发现随着油相体积的增大,乳液的稳定性呈现增大的趋势。
In order to explore the stability of the solid particles on the emulsion, the use of L-lysine as a catalyst for the synthesis of nano-SiO2 particles and nano-SiO2 particles with hexamethyldisilazane (HMDS) surface hydrophobic modification, after HMDS modified Of the nano-SiO2 particles as a stabilizer to prepare Pickering emulsion. The preparation, surface modification and properties of Pickering emulsion were characterized by particle size analyzer, field emission transmission electron microscopy, FTIR, TG-DSC, contact angle measurement, optical microscope and conductivity meter respectively. The results show that silica beads with small size and uniform morphology were successfully synthesized, and the hydrophobic trimethylsilyl groups were successfully grafted to the surface of nano-SiO2. Pickering latex prepared with different nano-SiO2 concentration showed that with the concentration of SiO2 The stability of emulsion increases gradually and the droplet diameter of emulsion tends to decrease. The Pickering emulsion prepared with different oil / water ratio shows that the stability of emulsion increases with the increase of oil phase volume.