Citation: ZHANG Long, HAN Jing-Jing, LI Jia-Jia, LIU Tian-Qing. Properties and Spreading Kinetics of Water-Based Cypermethrin Microemulsions[J]. Acta Physico-Chimica Sinica, ;2013, 29(02): 346-350. doi: 10.3866/PKU.WHXB201211302 shu

Properties and Spreading Kinetics of Water-Based Cypermethrin Microemulsions

1.
1 School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China;
2 Jiangsu Animal Husbandry and Veterinary College, Taizhou 225300, Jiangsu Province, P. R. China

Received Date: 16 September 2012
Available Online: 30 November 2012
Fund Project: 国家自然科学基金(20573091) (20573091)

Water-based cypermethrin microemulsions were prepared by adding oil to emulsified water, with ethyl butyrate as the solvent, TritonX-100 (TX-100) and sodium dodecyl benzene sulfonate (SDBS) as surfactants, and n-butyl alcohol (n-C₄H₉OH) as a co-surfactant. The structure and properties of the microemulsions were investigated by determining the phase diagram, and using negative-staining transmission electron microscopy, and conductivity, surface tension, dynamic light scattering, and contact angle measurements. The spreading kinetics of the microemulsions on the leaf surface of Youngfu wheat was also studied. The results showed that the cypermethrin microemulsions followed the oil-in-water model, and had a strong solubilizing effect on cypermethrin. The microemulsions showed a low contact angle, and low surface tension, and the droplet radius was about 45 nm. The kinetics for the spreading of the microemulsions on the leaf surface of Youngfu wheat fitted a second-order kinetic equation. The kinetic rate constants were 0.1090 (°)^-1·min^-1 (20℃) and 0.1572 (°)^-1·min^-1 (30℃), and the activation energy was 27.03 kJ·mol^-1.
- Cypermethrin,
- Microemulsion,
- Oil in water,
- Contact angle,
- Spreading kinetics
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