纤维素纳米纤维的硅烷化改性及其在Pickering乳液中的乳化性能研究

Study on Silanization Modification of Cellulose Nanofibers and Its Emulsifying Property in Pickering Emulsion

中文关键词:  纤维素纳米纤维  硅烷  Pickering乳液  稳定性

Key Words:cellulose nanofiber  silane  Pickering emulsion  stability

中文摘要:

      利用十六烷基三甲氧基硅烷（HDS）对纤维素纳米纤维（CNF）进行硅烷化改性，并探究改性产物硅烷化CNF（H-CNF）质量分数对其乳化性能及形成的Pickering乳液性质的影响。通过X射线衍射谱图、傅里叶变换红外光谱对H-CNF进行结构表征，并测定Pickering乳液液滴的粒径分布、微观形貌及Zeta电位，以乳脂指数（CI）表征Pickering乳液的稳定性。结果表明，当硅烷化改性时HDS与CNF质量比为5∶1时，制备的H-CNF的三相接触角为（87.6±0.6）°，润湿性能适中；随着H-CNF质量分数由1.0%增加至2.5%，Pickering乳液液滴的Zeta电位降低，乳液液滴粒径明显减小，CI降低，Pickering乳液稳定性提高。

Abstract:

      Cellulose nanofibers （CNF） were silanization modified by hexadecyl trimethoxysilane （HDS）， and the effect of mass fraction of silanized CNF （H-CNF） on its emulsification performance and prepared Pickering emulsion properties was investigated. The structure of H-CNF was characterized by X-ray diffraction pattern and Fourier transform infrared spectroscopy， and the particle size distribution， micro morphology and Zeta potential of Pickering emulsion droplets were measured. The stability of Pickering emulsion was characterized by milk fat index （CI）. The results showed that when the mass ratio of HDS and CNF was 5∶1 during silanization modification， the three-phase contact angle of prepared H-CNF was （87.6 ± 0.6）°， and the wetting performance was moderate. With the increase of H-CNF mass concentration from 1.0% to 2.5%， the Zeta potential of Pickering emulsion droplets decreased， the particle size of emulsion droplets decreased significantly， CI decreased， and the stability of Pickering emulsion increased.