Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (05): 105-111.doi: 10.13475/j.fzxb.20190705707

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of nano-TiO2 stabilized emulsion and its application in microencapsulation

WANG Sen1, CHEN Ying1,2()   

  1. 1. College of Chemistry, Chemical Engineering & Biotechnology, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Science & Technology of Eco-Textile, Ministry of Education,Donghua University, Shanghai 201620, China
  • Received:2019-07-18 Revised:2019-11-15 Online:2020-05-15 Published:2020-06-02
  • Contact: CHEN Ying E-mail:yingchen0209@dhu.edu.cn

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Abstract:

In order to study the application of solid nanoparticles in place of traditional emulsifiers in the preparation of microcapsules, the modified nano-TiO2 was used as an emulsion stabilizer to prepare Pickering emulsion, for the preparation of anti-mosquito microcapsules. The effects of surface modification of nano-TiO2 salicylic acid, TiO2-SA dosage, emulsification speed, emulsification time and PVA dosage on emulsion stability and preparation of microcapsules were studied. Emulsification conditions were obtained by characterizing emulsion particle size, microcapsule embedding rate and particle size and optimal condition was found to be as follows: TiO2-SA 0.75 %, PVA 1.0%, room temperature, 8 000 r/min, and 7 min. The research shows that the modified TiO2 (TiO2-SA) is capable of improving the lipophilic hydrophilicity and stability of the nano-TiO2. The microcapsules synthesized by the Pickering emulsion prepared by the emulsification conditions obtained in the research have a spherical rule with a smooth surface and an embedding rate of 84.02 %, and the average particle size is 2.867 μm. Surface energy spectrum analysis of the microcapsules reveals the inclusion of C, O, N and Ti elements.

Key words: Pickering emulsion, TiO2 modification, anti-mosquito microcapsule, embedding rate, particle size

CLC Number: 

  • TS195.583

Fig.1

C1s XPS total energy spectrum of modified and unmodified nano-TiO2"

Fig.2

C1s XPS spectra of modified nano-TiO2"

Fig.3

Emulsion prepared by nano-TiO2. (a)0 h; (b)After 4 h"

Fig.4

Emulsion prepared by TiO2-SA. (a) 0 h; (b)After 4 h"

Tab.1

Emulsion particle size with different TiO2-SA mass fraction"

TiO2-SA
质量分数/%		 0.10 0.25 0.50 0.75 1.00 1.50
粒径/μm 0.821 0.741 0.721 0.615 0.598 0.580

Fig.5

Pickering emulsion microscopy with different TiO2-SA mass fraction"

Fig.6

Pickering emulsion stability prepared with different TiO2-SA mass fraction. (a)0 h; (b) After 4 h"

Tab.2

Effect of TiO2-SA mass fraction on microcapsule preparation"

TiO2-SA质量分数/% 粒径/μm 包埋率/%
0.25 0.941 69.02
0.50 0.913 70.75
0.75 0.797 84.02
1.00 0.924 71.97
1.25 1.010 57.42

Tab.3

Emulsion particle size at different emulsification rates"

乳化速度/
(r·min-1)		 4 000 6 000 8 000 10 000 12 000
粒径/μm 1.321 1.081 0.631 0.617 0.602

Fig.7

Microscope images of Pickering emulsion prepared at different emulsification rates(×400)"

Fig.8

Pickering emulsion stability prepared at different emulsification rates. (a) 0 h; (b)After 4 h"

Tab.4

Influence of emulsification rate on preparation of microcapsules"

乳化速度/(r·min-1) 粒径/μm 包埋率/%
4 000 1.619 68.84
6 000 1.381 71.61
8 000 0.831 80.75
10 000 0.807 76.32
12 000 0.770 70.52

Tab.5

Particle size of emulsion with different emulsification time"

乳化时间/min 3 5 7 9 11
粒径/μm 1.431 1.062 0.701 0.687 0.679

Fig.9

Microscope images of Pickering emulsion prepared at different emulsification times(×400)"

Fig.10

Pickering emulsion stability prepared at different emulsification times. (a) 0 h; (b) After 4 h"

Tab.6

Influence of emulsification time on preparation of microcapsules"

乳化时间/min 粒径/μm 包埋率/%
3 1.435 65.26
5 1.261 70.52
7 0.831 80.75
9 0.820 76.32
11 0.812 73.52

Tab.7

Emulsion particle size at different PVA mass fraction"

PVA质量
分数/%		 0.0 0.5 1.0 1.5 2
粒径/μm 1.305 0.963 0.624 0.612 0.605

Fig.11

Microscope images of Pickering emulsion prepared with different PVA mass fraction(×400)"

Fig.12

Pickering emulsion stability prepared with different PVA mass fraction. (a) 0 h; (b)After 4 h"

Tab.8

Effect of PVA mass fraction on preparation of microcapsules"

PVA质量分数/% 粒径/μm 包埋率/%
0.0 4.125 67.89
0.5 3.354 76.54
1.0 2.867 84.02
2.0 2.786 85.12

Fig.13

SEM image of microcapsule(×5 000)"

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