海藻酸衍生物活化二氧化硅纳米粒制备Pickering乳液

doi:10.13218/j.cnki.csdc.2014.05.054

摘要/Abstract

摘要： 采用辛胺改性海藻酸钠,并以其通过物理混合和化学接枝2种途径活化SiO₂纳米粒,利用红外光谱、核磁共振氢谱和动态光散射等对产物进行了表征,并超声乳化制备了其相应的Pickering乳液,进而对乳液的形貌进行了观察。结果表明:海藻酸钠上成功接枝了辛胺侧链;经2种途径活化后的SiO₂纳米粒粒径均大于未活化的SiO₂纳米粒,分别增至467.0和414.4 nm;其Zeta电位较SiO₂纳米粒自身的-17.0 mV也发生了变化,分别为-43.9和-35.2 mV。同时,活化后的纳米粒具有了较好的乳化性能,尤其是通过表面化学接枝改性海藻酸钠的SiO₂纳米粒,其形成的Pickering乳液液滴分散性好,大小均一,平均粒径为5 μm。

关键词: 海藻酸盐衍生物, SiO₂纳米粒, 物理混合, 化学接枝, Pickering乳液

Abstract: SiO₂ nanoparticles were activated by octylamine modified sodium alginate via two ways,physical mixing and chemical grafting.The activated SiO₂ nanoparticles were characterized by FTIR,¹HNMR and DLS,et al.Then Pickering emulsions were prepared with the activated SiO₂ nanoparticles under assistance of ultrasonic wave,and morphology of the emulsions was observed.Experimental results showed that octylamine side chain was successfully grafted onto the sodium alginate.The particle size of activated SiO₂ nanoparticles via both physical mixing and chemical grafting ways is larger than that of unactivated SiO₂ nanoparticles,and increases to 467.0 and 414.4 nm respectively.Surface potential of activated SiO₂ nanoparticles changes to -43.9 and -35.2 mV respectively,which is lower than that of unactivated SiO₂ nanoparticles,which shows a surface potential of -17.0 mV.Meanwhile,the activated SiO₂ nanoparticles reveal better emulsifying properties,especially the nanoparticles activated by chemical grafting way could produce a more stable Pickering emulsion with better droplet dispersion,uniform size and with average particle diameter of 5 μm.

Key words: alginate derivative, SiO₂ nanoparticles, physical mixing, chemical grafting, Pickering emulsions

中图分类号:

O648.2+3

程春风, 李嘉诚, 颜慧琼, 刘若林, 王春修, 林强. 海藻酸衍生物活化二氧化硅纳米粒制备Pickering乳液[J]. 日用化学工业, 2014, 44(5): 241-246.

CHENG Chun-feng, LI Jia-cheng, YAN Hui-qiong, LIU Ruo-lin, WANG Chun-xiu, LIN Qiang. Preparation of Pickering emulsions with SiO₂ nanoparticles activated with alginate derivative[J]. China Surfactant Detergent & Cosmetics, 2014, 44(5): 241-246.

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