Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (11): 1974.doi: 10.7503/cjcu20170249
• Analytical Chemistry • Previous Articles Next Articles
FENG Jianguo1, YANG Guantian1, YUAN Xiaoyong2, CHEN Qicheng1, SUN Chencheng1, YUAN Shuzhong1,*()
Received:
2017-04-19
Online:
2017-11-10
Published:
2017-10-30
Contact:
YUAN Shuzhong
E-mail:szyuan@yzu.edu.cn
Supported by:
CLC Number:
TrendMD:
FENG Jianguo, YANG Guantian, YUAN Xiaoyong, CHEN Qicheng, SUN Chencheng, YUAN Shuzhong. Preparation, Characterization and Release Properties of β-Cypermethrin Microcapsules†[J]. Chem. J. Chinese Universities, 2017, 38(11): 1974.
Fig.1 OM images(A—C) and SEM images(A'—C') of the β-cypermethrin microcapsules prepared with different emulsifiersEmulsifier: (A, A') Tween-20; (B, B') Tween-40; (C, C') Tween-80.
Sample No. | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|
Amount of β-cypermethrin(%) | 1 | 1 | 1 | 1 | 1 |
Amount of dichloromethane(%) | 30 | 30 | 30 | 30 | 30 |
Amount of ethyecellulose(%) | 1.25 | 1.5 | 1.75 | 1.75 | 1.75 |
Amount of emulsifier(%) | 3 | 4 | 5 | 6 | 8 |
Shearing time/min | 8 | 8 | 8 | 8 | 8 |
Shearing rate/(r·min-1) | 12000 | 12000 | 12000 | 12000 | 12000 |
Mean particle size/μm | 67 | 63 | 64 | 43 | 25 |
Loading content(%) | 45.2 | 40.7 | 34.8 | 35.3 | 36.4 |
Table 1 Preparation parameters of microcapsule samples for release experiments
Sample No. | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|
Amount of β-cypermethrin(%) | 1 | 1 | 1 | 1 | 1 |
Amount of dichloromethane(%) | 30 | 30 | 30 | 30 | 30 |
Amount of ethyecellulose(%) | 1.25 | 1.5 | 1.75 | 1.75 | 1.75 |
Amount of emulsifier(%) | 3 | 4 | 5 | 6 | 8 |
Shearing time/min | 8 | 8 | 8 | 8 | 8 |
Shearing rate/(r·min-1) | 12000 | 12000 | 12000 | 12000 | 12000 |
Mean particle size/μm | 67 | 63 | 64 | 43 | 25 |
Loading content(%) | 45.2 | 40.7 | 34.8 | 35.3 | 36.4 |
Sample No. | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|
k | 0.119 | 0.102 | 0.089 | 0.118 | 0.149 |
n | 0.473 | 0.490 | 0.522 | 0.464 | 0.431 |
R2 | 0.988 | 0.991 | 0.979 | 0.987 | 0.990 |
Table 2 Ritger-Peppas model fitting of the cumulative release amount of β-cypermethrin*
Sample No. | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|
k | 0.119 | 0.102 | 0.089 | 0.118 | 0.149 |
n | 0.473 | 0.490 | 0.522 | 0.464 | 0.431 |
R2 | 0.988 | 0.991 | 0.979 | 0.987 | 0.990 |
Fig.7 Effects of the loading content with similar particle size on the release behavior of β-cypermethrinLoading content: a. 45.2%; b. 40.7%; c. 34.8%.
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