Swelling and diffusion model of a hydrophilic film coating on controlled-release urea particles

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• 作者：Ling Yang ; Di An ; Ting-Jie Wang ; ^{wangtj@tsinghua.edu.cn} ; Chengyou Kan ; Yong Jin
• 关键词：Coating ; Controlled-release ; Particle ; Permeability ; Swelling ; Urea
• 刊名：Particuology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：Complete
• 页码：73-82
• 全文大小：2810 K
• 卷排序：30

文摘

Dense latex films were spray-coated on urea particles in a fluidized bed to control urea release. Film swelling in urea solution was found to follow the Lagergren's pseudo-first order kinetics. The swollen film structure was studied and a swollen film structure model was proposed. Film permeability coefficient has a linear relationship with the swelling ratio. Urea release curve was calculated from film swelling ratio and verified with measured result.