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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
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化学反应性水凝的扩散性快速胀

Chinmay Katke1,2, Peter A Korevaar3, C Nadir Kaplan1,2

  • 1Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.

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概括

响应刺激的水凝因酸诱导的离子释放而迅速膨胀和收缩,这一过程由一种新的"凝扩散"机制解释. 这一发现增强了在药物输送和软机器人技术中的水凝应用.

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科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学

背景情况:

  • 聚烯酸水凝在接触酸时释放储存的离子.
  • 这种离子释放会影响凝的透压和胀行为.
  • 现有的模型没有完全捕捉到观察到的快速膨胀动态.

研究的目的:

  • 调查聚烯酸水凝中酸诱导的快速胀和收缩周期背后的机制.
  • 开发一个理论框架来解释观察到的水凝激活.
  • 探索这种机制在先进的水凝应用中的潜力.

主要方法:

  • 对离子释放和水凝膨胀动态的实验观察.
  • 发展一个连续波弹性理论.
  • 介绍和分析的世界.
  • 凝的扩散性化.
  • 一个机制,一个机制.

主要成果:

  • 酸诱导的离子释放显著增加了凝的透压,导致胀率超过溶剂吸收.
  • 一个小说 一个小说
  • 凝的扩散性化.
  • 这种由凝聚合物和离子之间的固体排斥驱动的机制解释了溶剂的快速摄入和网络的扩张.
  • 随着离子度梯度的消散,凝的膨胀停止,随后是凝的收缩.

结论:

  • 开发的多弹性理论准确地解释了实验中的水凝启动周期.
  • 工程 工程师 工程师 工程师
  • 凝的扩散性化.
  • 提供了一条通往具有增强拉伸率和功率输出的刺激响应水凝的途径.
  • 这种机制对药物输送系统和软机器人有重大影响.