Vortex fluidic mediated one-step fabrication of polyvinyl alcohol hydrogel films with tunable surface morphologies and enhanced self-healing properties
Vortex fluidic mediated one-step fabrication of polyvinyl alcohol hydrogel films with tunable surface morphologies and enhanced self-healing properties
复制标题
涡流介导一步制备具有可调表面形态和增强自修复性能的聚乙烯醇水凝胶薄膜
DOI：
10.1007/s40843-020-1301-y
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发表时间：
2020-04
期刊：
影响因子：
--
通讯作者：
Youhong Tang
中科院分区：
文献类型：
--
作者：
Javad Tavakoli;Colin L. Raston;Yong Ma;Youhong Tang
Previous strategies for controlling the surface morphologies of polyvinyl alcohol (PVA)-based hydrogels, including freeze-drying and electrospinning, require a post-treatment process, which can affect the final textures and properties of the hydrogels. Of particular interest, it is almost impossible to control the surface morphology during the formation of PVA hydrogels using these approaches. The strategy reported in this study used the novel vortex fluidic device (VFD) technology, which for the first time provided an opportunity for one-step fabrication of PVA hydrogel films. PVA hydrogels with different surface morphologies could be readily fabricated using a VFD. By also reducing the cross-linking agent concentration, a self-healing gel with enhanced fracture stress (60% greater than that of traditionally made hydrogel) was achieved. Interestingly, the associated self-healing property remained unchanged during the 260-s mechanical testing performed with the strain rate of 5% s −1 . The VFD can effectively tune the surface morphologies of the PVA-based hydrogels and their associated properties, particularly the self-healing property. 控制基于聚乙烯醇(PVA)的水凝胶表面形态的传统策略包括冷冻干燥和静电纺丝, 但是这些方法要求进行后处理过程, 这可能会影响最终的水凝胶的质地和性能. 特别是, 使用这些方法几乎不可能在PVA水凝胶的形成过程中控制其表面形貌. 本研究首次报道了借助新颖的涡流装置(VFD)技术一步法制备PVA水凝胶膜. 使用VFD可以很容易地制造出具有不同表面形貌的PVA水凝胶. 并通过降低交联剂的浓度, 获得了具有增强断裂应力(比传统制造 的水凝胶大60%)的自愈水凝胶. 有趣的是, 在5% s −1 的应变率下进行的260 s机械测试中, 相关的自愈特性保持不变. VFD可以有效地调控基于PVA的水凝胶的表面形貌及其相关特性, 尤其是水凝胶的自愈特性.
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