己二酸二酯原位功能化SiO2稳定Pickering乳液的相反转研究

doi:10.7503/cjcu20190452

高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (1): 140.doi: 10.7503/cjcu20190452

己二酸二酯原位功能化SiO₂稳定Pickering乳液的相反转研究

陈静¹,陈进华²,尹德忠^1,^2,^*(),张伟¹

^1. 西北工业大学理学院, 西安 710072
^2. 西北工业大学长三角研究院, 苏州 215400

收稿日期:2019-08-14 出版日期:2020-01-10 发布日期:2019-11-14
通讯作者: 尹德忠 E-mail:dezh_yin@nwpu.edu.cn
基金资助:
国家重点研发计划项目批准号:(2016YFC0301302);陕西省基础研究基金资助批准号:(2017JM5080)

Phase Inversion of Pickering Emulsion Stabilized by Adipate-functionalized SiO₂ Particles ^†

CHEN Jing¹,CHEN Jinhua²,YIN Dezhong^1,^2,^*(),ZHANG Wei¹

^1. School of Science, Northwestern Polytechnical University, Xi’an 710072, China;
^2. Yangtze Delta Research Institute, Northwestern Polytechnical University, Suzhou 215400, China

Received:2019-08-14 Online:2020-01-10 Published:2019-11-14
Contact: Dezhong YIN E-mail:dezh_yin@nwpu.edu.cn
Supported by:
? Supported by the National Key Research and Development Program of China No(2016YFC0301302);the Shaanxi Provincial Natural Science Foundation, China No(2017JM5080)

摘要/Abstract

摘要：

研究了原位改性SiO₂稳定的己二酸二酯-水体系的乳液相反转特性, 探究了不同己二酸二酯分子对SiO₂的功能化改性能力. 研究发现, 己二酸二酯的烷基链长对乳化行为有重要影响, 长分子链二酯倾向于形成O/W乳液, 而短分子链二酯则倾向于形成W/O型乳液. 结果表明, 短分子链的己二酸二酯对SiO₂粒子的原位功能化改性效果更好, 其原因在于短分子链的己二酸二酯空间位阻较小, 酯基与Si—OH形成氢键能力较强. 改性SiO₂的红外光谱证明了SiO₂表面不同己二酸二酯的数量变化. 碱性条件下乳液稳定特性再次证实了所提出的机理.

关键词: Pickering乳液, 相反转, 表面改性, 己二酸二烷基酯

Abstract:

Phase inversion of emulsion of dialkyl adipate-water mixture stabilized by adipate-functionalized SiO₂ particles was described. Ability of different adipate to functionalize SiO₂ particles for Pickering emulsion was investigated systematically. Chain length of alkyl in adipates was found to be crucial to the property of formed emulsion. Adipate with long alkyl chain was apt to form oil-in-water emulsion, while adipate with short alkyl chain was apt to form wate-in-oil emulsion. The reason of this difference was explored by analyzing the phase inversion. Adipate with short alkyl chain has strong hydrogen bonding ability with Si—OH on SiO₂ particles. Fourier transform infrared(FTIR) spectra verified directly the difference of adipate archored on SiO₂ particles. Properties of emulsion prepared under pH=9 reconfirmed the proposed mechanism.

Key words: Pickering emulsion, Phase inversion, Surface functionalization, Dialkyl adipate

中图分类号:

O647

TrendMD:

陈静,陈进华,尹德忠,张伟. 己二酸二酯原位功能化SiO₂稳定Pickering乳液的相反转研究. 高等学校化学学报, 2020, 41(1): 140.

CHEN Jing,CHEN Jinhua,YIN Dezhong,ZHANG Wei. Phase Inversion of Pickering Emulsion Stabilized by Adipate-functionalized SiO₂ Particles ^†. Chem. J. Chinese Universities, 2020, 41(1): 140.

图/表 6

Fig.1 Digital image(A), optical micrographs of W/O(B) and O/W(C) emulsions stabilized by SiO2 dispersed in adipate

Table 1 Properties of emulsions of five adipates

No.	Adipate [density/(g·mL^-1)]	Mass fraction of SiO₂(%)	Conductivity/ (μS·cm^-1)	Type of emulsion	Diameter/μm	RSD(%)
1	diMe(1.06)	1.0	0.14	W/O	26.2	40
2	diEt(1.01)	1.0	0.13	W/O	27.8	45
3	diPro(0.98)	1.0	0.22	W/O	29.6	44
4a	diBut(0.96)	0.5	9.32	O/W	93.7	43
4b	diBut(0.96)	1.0	10.1	O/W	82.6	39
5	diOct(0.93)	1.0	9.56	O/W	49.6	52

Fig.2 Conductivity and inversion point of emulsion of different adipate

Fig.3 Conductivity of emulsion stabilized under different SiO2 content

Fig.4 FTIR spectra of diPro(a) and adipates(b—f) functionalized SiO2 particles b. diMe; c. diEt; d. diPro; e. diBut; f. diOct.

Fig.5 Emulsion stabilized by SiO2 under pH=9.0 (A) Digital images of emulsions of diMe, diEt, diPro, diBut and diOct; (B) conductivity and storage stability of emulsions.

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己二酸二酯原位功能化SiO₂稳定Pickering乳液的相反转研究

Phase Inversion of Pickering Emulsion Stabilized by Adipate-functionalized SiO₂ Particles ^†

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