摘要
高含水量的水凝胶通常机械性能差、响应单一,严重限制了其作为软体驱动器的发展。为了制备出具有多响应和优异力学性能的智能水凝胶,以纳米海绵作为骨架,将明胶水凝胶加入其中并溢出一定厚度,从而获得具有双层各向异性结构的纳米海绵/明胶复合水凝胶。结果表明:纳米海绵/明胶复合水凝胶同时具备多种溶剂响应和优异的力学性能,与纯明胶水凝胶相比,复合水凝胶的拉伸应力和压缩应力从kPa级上升到MPa级;复合水凝胶改变了原始水凝胶的各向同性结构使其具备驱动能力,可以在多种离子溶液中弯曲变形,在3 mol/L的(NH_(4))_(2)SO_(4)溶液中弯曲角度可达247°;复合水凝胶用作微流控阀门,能识别特定溶液并调控其通过阀门的速度。通过引入纳米海绵骨架有效地构造智能水凝胶的各向异性结构,并明显增强了水凝胶的力学性能和驱动能力,为智能水凝胶在微流控系统、智能驱动器和人工肌肉等领域的应用提供了新的思路。
Hydrogels with high water content usually have poor mechanical properties and unvaried response,which seriously limits their development as soft drivers.In order to prepare intelligent hydrogels with multiple responses and excellent mechanical properties,nano-sponge was used as the skeleton,and gelatin hydrogels were added to it and spilled out to a certain thickness,to obtain a double-layer anisotropic nano-sponge/compound gelatin hydrogel.The results showed that the nano-sponge/composite gelatin hydrogel had multiple solvent responses and excellent mechanical properties.Compared with the pure gelatin hydrogel,the tensile stress and compressive stress of the composite hydrogel grew from kPa level to MPa level.The composite hydrogel changed the isotropic structure of the original hydrogel,making it capable of driving and bending in a variety of ionic solutions.It can reach a bending angle of 247°in 3 mol/L(NH_(4))_(2)SO_(4) solution.The composite hydrogels were used as microfluidic valves to identify specific solutions and regulate their speed when they pass through the valve.The anisotropic structure of intelligent hydrogel can be effectively constructed by introducing nano-sponge skeleton,and the mechanical properties and driving ability of hydrogels can be effectively enhanced,which provides a new idea for the application of intelligent hydrogels in microfluidic system,intelligent actuator and artificial muscle,etc.
作者
匡中文
苑苗发
刘爱萍
KUANG Zhongwen;YUAN Miaofa;LIU Aiping(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China;School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2022年第6期821-828,共8页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51572242)。
关键词
明胶
纳米海绵
各向异性结构
机械性能
智能驱动器
gelatin
nano-sponge
anisotropic structure
mechanical properties
intelligent actuator
