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

doi:10.7503/cjcu20190452

Abstract

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

CLC Number:

O647

TrendMD:

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

Figures/Tables 6

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

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

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