化工学报 ›› 2020, Vol. 71 ›› Issue (4): 1859-1870.DOI: 10.11949/0438-1157.20191061
罗东琴1(),孙宁1,李秋红1(),隋鹏亮1,姜秋艳1,隋晓飞2,李爱香1
收稿日期:
2019-09-23
修回日期:
2020-01-02
出版日期:
2020-04-05
发布日期:
2020-04-05
通讯作者:
李秋红
作者简介:
罗东琴(1995—),女,硕士研究生,基金资助:
Dongqin LUO1(),Ning SUN1,Qiuhong LI1(),Pengliang SUI1,Qiuyan JIANG1,Xiaofei SUI2,Aixiang LI1
Received:
2019-09-23
Revised:
2020-01-02
Online:
2020-04-05
Published:
2020-04-05
Contact:
Qiuhong LI
摘要:
用具有氧化还原活性分子乙酰基二茂铁吖嗪(Fc+A)对磁性纳米颗粒Fe3O4@SiO2进行非共价疏水改性,将改性颗粒作为乳化剂制备Pickering乳液。通过TEM、SEM、FTIR、XRD、接触角测量、光学显微镜等对纳米颗粒及Pickering乳液的结构、形貌和性能进行表征。结果表明:制备的核壳结构纳米颗粒粒径为150 nm左右,分散均匀;Fc+A成功修饰到纳米颗粒表面,且随Fc+A浓度的增加,改性颗粒的接触角明显增大;Fc+A浓度为12.5 mmol/L,乳化剂浓度为0.3%(质量),油水比为4∶6,搅拌速率为10000 r/min,得到的Pickering乳液具有良好的稳定性。而且,所得乳液具双重响应性,通过氧化还原和磁场可实现对乳液稳定性的可逆调控。
中图分类号:
罗东琴, 孙宁, 李秋红, 隋鹏亮, 姜秋艳, 隋晓飞, 李爱香. 非共价改性纳米颗粒稳定Pickering乳液的制备及可逆调控[J]. 化工学报, 2020, 71(4): 1859-1870.
Dongqin LUO, Ning SUN, Qiuhong LI, Pengliang SUI, Qiuyan JIANG, Xiaofei SUI, Aixiang LI. Preparation and modulation of Pickering emulsion stabilized by non-covalent hydrophobic modified nanoparticles[J]. CIESC Journal, 2020, 71(4): 1859-1870.
图4 Fe3O4@SiO2和Fc+A修饰的Fe3O4@SiO2纳米颗粒扫描电镜及EDS元素分布图
Fig.4 SEM images of Fe3O4@SiO2, Fc+A-modified Fe3O4@SiO2, and EDS element distribution of C, N, O, Si and Fe for Fc+A-modified nanoparticles
图7 不同Fc+A浓度改性纳米颗粒稳定的Pickering乳液的显微、宏观图片及粒径分布
Fig.7 Optical micrographic images, visual appearance and droplets size distribution of emulsions stabilized by modified-Fe3O4@SiO2 nanoparticles with different Fc+A concentration
图8 不同乳化剂浓度的Pickering乳液的显微、宏观照片与粒径分布
Fig.8 Optical micrographic images, visual appearance and droplets size distribution of emulsions at different mass fractions of emulsifier
图9 不同油水比的Pickering乳液的显微、宏观照片及粒径分布
Fig.9 Optical micrographic images, visual appearance and droplets size distribution of emulsions at different oil-water ratio
图11 FcA的荧光光谱、Pickering乳液的氧化还原和磁场调控
Fig.11 Fluorescence sprctra of FcA, redox and magnetic field responses of Pickering emulsions and corresponding optical micrographic images
图12 Fc+A修饰Fe3O4@SiO2纳米颗粒的结构及磁场和氧化还原激励响应Pickering乳液的调控示意图
Fig.12 Structural description for redox conversion of FcA and Fc+A-modified Fe3O4@SiO2 particles (top) and strategy for emulsification and demulsification of Pickering emulsions triggered by redox (bottom)
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