摘要
具有生理信号智能传感功能的电子皮肤(e-skins),因其在智能机器人、人机界面和可穿戴医疗系统等方面的广泛应用前景而备受关注。因此,构建具有各向异性导电性能的电子皮肤,从而拓宽柔性传感电子皮肤的应用范围至关重要。本研究以柔性聚乙烯醇(PVA)为水凝胶基底材料,利用磁感应技术诱导具有电、磁性能的纳米复合物Fe_(3)O_(4)@MXene在PVA网络中取向排列,构筑了具有各向异性导电性能的Fe_(3)O_(4)@MXene/PVA复合水凝胶。结果表明,当PVA聚合物的交联度为1.5%,PVA质量分数为8 wt%时,Fe_(3)O_(4)@MXene/PVA复合水凝胶的拉伸模量达到19.49 kPa,断裂应变达到237%,所得凝胶的力学性能最优;当Fe_(3)O_(4)@MXene的质量分数为0.064 wt%时,所得凝胶的导电性能最优,且该凝胶在平行于纳米复合物取向方向的电导率达到0.415 S/m,垂直于纳米复合物取向方向的电导率为0.319 S/m。最后,验证了该复合水凝胶作为电子皮肤,用于实现人体手腕关节弯曲角度实时监测的可行性。该电子皮肤接近人体组织的各向异性形态及结构,在生物医学和电子传感等相关领域具有广阔的应用前景。
Electronic skins(e-skins)with intelligent sensing abilities for physiological signals have attracted much attention for their promising applications in smart robots,human-machine interfaces,and wearable medical systems.It is crucial to construct e-skins with anisotropic conductive properties to broaden the application scope of flexible sensing e-skins.In this work,a kind of composite hydrogel named Fe_(3)O_(4)@MXene/PVA with anisotropic conductive properties was constructed by using flexible polyvinyl alcohol(PVA)as hydrogel matrix.Magnetic induction technology was used to induce the orientation alignment of Fe_(3)O_(4)@MXene in the PVA hydrogel.Experimental results showed that when the cross-linking degree of PVA was 1.5% and the mass fraction of PVA was 8 wt%,the tensile modulus of Fe_(3)O_(4)@MXene/PVA reached 19.49 kPa and the fracture strain reached 237%.Mechanical properties of the resulted hydrogel were optimized.When the mass fraction of Fe_(3)O_(4)@MXene was 0.064 wt%,the electrical conductivity was optimal,the electrical conductivity in the direction parallel was 0.415 S/m and that in the perpendicular direction was 0.319 S/m.Finally,this work verified the feasibility of the composite hydrogel as an electronic skin for realizing real-time monitoring of the bending angle of human wrist joints.The anisotropic morphology and structure of the electronic are close to that of human tissues,and the composite hydrogel has broad application prospects in biomedical,electronic sensing,and other related fields.
作者
郎博
张雪慧
武晓刚
王艳芹
陈维毅
Lang Bo;Zhang Xuehui;Wu Xiaogang;Wang Yanqin;Chen Weiyi(College of Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030024,China)
出处
《中国生物医学工程学报》
CSCD
北大核心
2023年第5期594-602,共9页
Chinese Journal of Biomedical Engineering
基金
山西省自然科学基金(2021-0302123158)
山西浙大新材料与化工研究院(2022SX-TD023)。
关键词
各向异性
电子皮肤
磁诱导
水凝胶
应变传感
anisotropy
conductive
magnetic induction
hydrogel
strain sensing
