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Positive charge pesticide nanoemulsions prepared by the phase inversion composition method with ionic liquids

机译：离子液体相转化组成法制备的正电荷农药纳米乳

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The deposition of pesticide liquid droplets on plant surfaces is of great importance in agricultural application. More than 50% of agrochemicals are lost and wasted during the spraying and wetting processes. Because the surfaces of plant leaves are negatively charged, we produced a kind of positive charge lambda-cyhalothrin loaded oil-in-water nanoemulsion in the system water/EL-80-Span 60/solvent 150# via the phase inversion composition (PIC) method with addition of Ionic Liquids (ILs). The electrostatic interaction between the negative charge surface and positive charge droplet would highly increase the wetting property. The results show that the positive zeta potential of nanoemulsion droplets gained along with the increase concentration of P14444Br, but with the increase concentration of P4444Br, the negative zeta potential of nanoemulsion droplets changed slightly and stayed around ?17.8 mV (without any ILs). Besides, we explored the rheology characteristic of prepared nanoemulsions. Additionally, the contact angle experiments show that the positively charged nanoemulsions have a stronger adsorption on the negative surface and the contact angle decreased along with the increase of positive charge. Significantly, with addition of ILs, the nanoemulsions showed an excellent long-term stability due to electrostatic repulsion between droplets and homogeneous nanoscale droplet size. The highly stable pesticide nanoemulsions are of great importance in practical application and the nanoemulsions prepared with ILs offered a good potential as a carrier for drug delivery.
机译：农药液滴在植物表面的沉积在农业应用中非常重要。在喷洒和润湿过程中，超过50％的农药损失和浪费。由于植物叶片表面带负电荷，因此我们在水/ EL-80-Span 60 /溶剂150＃系统中通过 生成了一种带正电荷的氟氯氰菊酯负载水包油纳米乳液。添加离子液体（IL）的相转化成分（PIC）方法。负电荷表面和正电荷液滴之间的静电相互作用将大大提高润湿性。结果表明，随着P 14444 Br浓度的增加，纳米乳液液滴的正ζ电势增加，而P 4444的浓度增加。 Br，纳米乳剂液滴的负ζ电势略有变化，并保持在？17.8 mV左右（无任何介电常数）。此外，我们还研究了制备的纳米乳液的流变特性。另外，接触角实验表明，带正电的纳米乳剂在负极表面具有较强的吸附作用，且接触角随正电荷的增加而减小。明显地，由于添加了IL，纳米乳剂由于液滴之间的静电排斥和均匀的纳米级液滴尺寸而显示出优异的长期稳定性。高度稳定的农药纳米乳剂在实际应用中非常重要，用IL制备的纳米乳剂作为药物输送的载体具有良好的潜力。

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