穿梭效应介导的界面聚合深度调节农药微胶囊的使用性能,ACS Nano

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穿梭效应介导的界面聚合深度调节农药微胶囊的使用性能
ACS Nano ( IF 15.8 ) Pub Date : 2023-10-06 , DOI: 10.1021/acsnano.3c07915
Tao Zhang ₁ , Hongzhen Sun ₁ , Liyuan Yang ₁ , Peng Zhang ₂ , Yaozhong Zhang ₃ , Jingbo Bai ₄ , Feng Liu ₁ , Da-Xia Zhang ₁

Affiliation

高度水溶性的杀线虫剂噻唑磷预计将进行微胶囊化，以增强其在植物根部周围的保留并减少渗入地下水。然而，微胶囊（MC）核心的亲水性对微胶囊壳演化影响的潜在机制仍不清楚，这对封装水溶性核心材料提出了挑战。本研究通过研究界面传质对壳形成的影响，阐明了微胶囊的微观形成机制，并提出了一种调控壳结构的方法。研究表明，增强核的亲水性可以增强油相和水相之间的穿梭效应，扩大聚合反应区域，并形成疏松而厚的壳。采用溶剂油150#（MCs-SOL）制备的微胶囊壳厚度仅为264 nm，而采用丙二醇二乙酸酯与溶剂油150#按2:1比例制备的微胶囊（MCs-P2S1）的厚度为5.2倍。外壳致密性的增强降低了微胶囊的释放速率和噻唑磷在土壤中的淋溶距离，从而降低淋失风险并促进活性成分在作物根部的分布。MCs-SOL 的有限浸出距离测量为 8 cm，在控制根瘿线虫方面表现出 87.3% 的令人满意的功效。MCs壳的厚度和致密性可以通过操纵界面穿梭效应来调节，为提高利用效率同时减轻潜在环境风险提供了一种有前景的方法。

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Interfacial Polymerization Depth Mediated by the Shuttle Effect Regulating the Application Performance of Pesticide-Loaded Microcapsules

The highly water-soluble nematicide fosthiazate is anticipated to undergo microencapsulation in order to enhance its retention around plant roots and mitigate leaching into groundwater. However, the underlying mechanism governing the influence of hydrophilicity of the microcapsule (MC) core on the evolution of the microcapsule shell remains unclear, posing challenges for encapsulating water-soluble core materials. This study elucidates the microlevel formation mechanism of microcapsules by investigating the impact of interfacial mass transfer on shell formation and proposes a method for regulating the structure of shells. The study reveals that enhancing the hydrophilicity of the core enhances the shuttle effect between the oil and aqueous phase, expands the region of polymerization reactions, and forms a loose and thick shell. The thickness of the microcapsule shell prepared using solvent oil 150# (MCs-SOL) measures only 264 nm, while that of the microcapsules prepared using propylene glycol diacetate and solvent oil 150# at a ratio of 2:1 (MCs-P2S1) is 5.2 times greater. The enhanced compactness of the shell reduced the release rate of microcapsules and the leaching distance of fosthiazate in soil, thereby mitigating the risk of leaching loss and facilitating the distribution of active ingredients within crop roots. The MCs-SOL had a limited leaching distance measurement of 8 cm and exhibited a satisfactory efficacy of 87.3% in controlling root galling nematodes. The thickness and compactness of the MCs shell can be regulated by manipulating the interfacial shuttle effect, providing a promising approach to enhancing utilization efficiency while mitigating potential environmental risks.

更新日期：2023-10-06

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