In this study, the ability of nanoporous anodic alumina (NAA) for the controlled release of agrochemicals including indole-3-acetic acid (IAA) and bentazon was investigated. This study was divided into two works. In the first work, the release of IAA loaded into the NAA pores was studied, and a new two-stage mechanism was proposed for the description of this release process. The first stage was modeled using the diffusion–dissolution equation with a moving boundary condition, while the second stage was correlated by the diffusion–dissolution equation with fixed boundary conditions. The proposed model predicts that the release rate in the first stage is first order when the pore diameter is small and is proportional to the reciprocal of the square root of time when the pore diameter is large. The results of the model also demonstrate that in the second stage, the increase in the pore diameter, at first, leads to an enhancement of the release rate; while a further increase in the pore diameter results in a decrease of release rate. In the second work of this study, NAA was used as a barrier membrane to form a reservoir system for the release of bentazon. The experimental data of this study were well fitted to the first-order release model. The results of this model confirm that an increase in the pore diameter leads to an enhancement of the release rate, while an opposite trend was found with increasing the pore length.

中文翻译：

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纳米多孔阳极氧化铝释放体外农用化学品的实验研究与建模

在这项研究中，研究了纳米多孔阳极氧化铝（NAA）对包括吲哚-3-乙酸（IAA）和苯达松的农药的控释能力。这项研究分为两部分。在第一个工作中，研究了加载到NAA孔中的IAA的释放，并提出了一个新的两阶段机制来描述该释放过程。第一个阶段是使用具有动态边界条件的扩散溶解方程来建模的，而第二阶段是通过具有固定边界条件的扩散溶解方程来建立的。提出的模型预测，当孔径较小时，第一阶段的释放速率为一阶；而当孔径较大时，则与时间的平方根的倒数成正比。该模型的结果还表明，在第二阶段，孔径的增加首先导致释放速率的提高；反之，而孔径的进一步增加导致释放速率降低。在这项研究的第二项工作中，NAA被用作屏障膜，形成了释放苯达松的储液系统。这项研究的实验数据很好地拟合了一级释放模型。该模型的结果证实，孔径的增加会导致释放速率的提高，而随着孔径的增加，发现相反的趋势。NAA用作屏障膜，形成用于释放苯达松的储液系统。这项研究的实验数据很好地拟合了一级释放模型。该模型的结果证实，孔径的增加会导致释放速率的提高，而随着孔径的增加，发现相反的趋势。NAA用作屏障膜，形成用于释放苯达松的储液系统。这项研究的实验数据很好地拟合了一级释放模型。该模型的结果证实，孔径的增加会导致释放速率的提高，而随着孔径的增加，发现相反的趋势。