阿维菌素
化学
介孔二氧化硅
杀虫剂
甲基丙烯酸缩水甘油酯
甲基丙烯酸酯
核化学
聚合
控制释放
介孔材料
化学工程
材料科学
聚合物
生物化学
有机化学
纳米技术
农学
生物
工程类
催化作用
作者
Yunhao Gao,Yanhui Zhang,Shun He,Yanan Xiao,Xiaoying Qin,Yuan Zhang,Donglin Li,Hao Ma,Hong You,Jianhong Li
标识
DOI:10.1016/j.cej.2019.01.105
摘要
Nanomaterials offer a great opportunity to develop new strategies for designing stimuli-responsive controlled release formulations (CRFs) of pesticides. In this study, a pH sensitive controlled release system, poly(glycidyl methacrylate-co-acrylic acid) (P(GMA-AA)) grafted hollow mesoporous silica ([email protected](GMA-AA) was fabricated. HMS was fabricated using a hard template and functionalized with 3-(trimethoxysilyl)propyl methacrylate. Then, P(GMA-AA) was grafted onto HMS by seeded precipitation polymerization. Abamectin (aba) was selected as the model pesticide to test the pH-sensitivity property. Detailed investigations showed that [email protected]@P(GMA-AA) exhibited a high pesticide-loading efficiency (33 wt%) and superior stability. The release of Aba from [email protected]@P(GMA-AA) was pH-dependent. In addition, [email protected]@P(GMA-AA) showed a strong combination with rice leaves, mainly benefitting from its low contact angle and high adhesion work on leaves. Bioactivity studies in a greenhouse and the field indicated that [email protected]@P(GMA-AA) was more toxic than Aba emulsifiable concentrate (Aba-EC) in controlling rice pest Cnaphalocrocis medinalis (Guénee) larvae, and it possessed long-term efficacy in practice. Importantly, there was no obvious influence on the growth of rice seedlings treated with [email protected]@P(GMA-AA). The results suggest that the proposed controlled release system is a promising candidate for the management of pests.
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