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相关概念视频

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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 called...

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响应pH和温度的超分子组合具有高度可调节的粘弹性:一个多刺激的二进制系统.

Yu-Ting Lin1, Shuhao Liu1, Bhargavi Bhat1

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA. makbulut@tamu.edu.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学
  • 类风病学 类风病学 类风病学

背景情况:

  • 响应刺激的材料对于开发可适应的电子,机械和生物系统至关重要.
  • 控制粘度和粘弹性等材料特性对于智能设备的功能至关重要.

研究的目的:

  • 报告一个新的pH和温度响应的二元超分子组件.
  • 为了研究这个组件的可调的粘性和粘性弹性特性.
  • 了解财产控制的基本机制.

主要方法:

  • 使用长链氨酸胺 (HAA) 和酸的二元超分子组合.
  • 在不同的pH值和温度条件下研究了质性质 (粘度,粘弹性).
  • 使用冷传输电子显微镜 (cryo-TEM) 来研究形态变化.

主要成果:

  • 通过操纵pH值和温度,实现了四个数量级的粘度控制.
  • 证明了将流体行为从非马克斯威尔式转变为马克斯威尔式的能力.
  • 观察到的形态变化 (球状囊泡,聚合囊泡,状腺结构) 与风湿学变化相关.

结论:

  • 二元超分子组件表现出显著的pH和温度反应性.
  • 由于pH诱导的HAA头组间距和酸间隙调节,风湿性质是可切换的.
  • 该系统为刺激响应材料应用提供了高度的控制.