Microfluidic Thermally Activated Materials for Rapid Control of Macroscopic Compliance.
Microfluidic Thermally Activated Materials for Rapid Control of Macroscopic Compliance.
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DOI：
10.1002/adfm.201304037
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发表时间：
2014-08-13
影响因子：
19
通讯作者：
Bettinger CJ
中科院分区：
文献类型：
--
作者：
Balasubramanian A;Standish M;Bettinger CJ
经历快速和可逆刚度转变的宏观结构可以用作机器人和医疗设备中许多应用的功能聚合物材料。热机械相变可以为机械性能的瞬态控制提供合适的机制。然而，用于致动的特征时间尺度很大并且由结构的尺寸决定。在本体聚合物内嵌入血管网络可以减小材料的特征长度尺度，并允许快速和可逆的热机械转变。在这里，我们报告灌注散装材料与嵌入微血管网络，可以进行快速和可逆的刚度转变。使用水性热灌注液，基于丙烯酸酯的热塑性结构在小至2.4 ± 0.5s的时间尺度上表现出储能模量，其动态范围在E' = 1.02 ± 0.07GPa和E' = 13.5 ± 0.7MPa之间。温度分布的时空演变，准确地预测使用有限元模拟和实验值进行比较。在一个演示中利用了刚性顺应性过渡，其中微血管化器械用于抓取外部物体，而无需移动部件的帮助。
Macroscopic structures that undergo rapid and reversible stiffness transitions can serve as functional polymeric materials for many applications in robotics and medical devices. Thermomechanical phase transitions can provide a suitable mechanism for transient control of mechanical properties. However, the characteristic time scale for actuation is large and dictated by the dimensions of the structure. Embedding vascular networks within bulk polymers can reduce the characteristic length scale of the material and permit rapid and reversible thermomechanical transitions. Here we report perfusable bulk materials with embedded microvascular networks that can undergo rapid and reversible stiffness transitions. Acrylate-based thermoplastic structures exhibit storage moduli with a dynamic range between E’ = 1.02 ± 0.07 GPa and E’ = 13.5 ± 0.7 MPa over time scales as small as 2.4 ± 0.5 s using an aqueous thermal perfusate. The spatiotemporal evolutions of temperature profiles were accurately predicted using finite element simulation and compared to experimental values. Rigid-compliant transitions were leveraged in a demonstration in which a microvascularized device was used to grasp an external object without the aid of moving parts.
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影响因子：
3.6
作者：
Giordano, RA;Wu, BM;Cima, MJ
通讯作者：
Cima, MJ
影响因子：
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通讯作者：
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通讯作者：
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作者：
Balasubramanian, Aditya;Morhard, Robert;Bettinger, Christopher J.
通讯作者：
Bettinger, Christopher J.