Zhao Qian, Liu Chang, Chang Yanjiao, Wu Han, Hou Yihao, Wu Siyang, Guo Mingzhuo
The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China.
College of Food Science and Engineering, Jilin University, Changchun 130062, China.
Sensors (Basel). 2023 Sep 24;23(19):8063. doi: 10.3390/s23198063.
Novel and practical low-temperature 3D printing technology composed of a low-temperature 3D printing machine and optimized low-temperature 3D printing parameters was successfully developed. Under a low-temperature environment of 0--20 °C, poly (vinyl alcohol) (PVA) matrix hydrogels including PVA-sodium lignosulphonate (PVA-LS) hydrogel and PVA-sodium carboxymethylcellulose (PVA-CMC) hydrogel exhibited specific low-temperature rheology properties, building theoretical low-temperature 3D printable bases. The self-made low-temperature 3D printing machine realized a machinery foundation for low-temperature 3D printing technology. Combined with ancillary path and strut members, simple and complicated structures were constructed with high precision. Based on self-compiling G-codes of path structures, layered variable-angle structures with high structure strength were also realized. After low-temperature 3D printing of path structures, excellent electrical sensing functions can be constructed on PVA matrix hydrogel surfaces via monoplasmatic silver particles which can be obtained from reduced reactions. Under the premise of maintaining original material function attributes, low-temperature 3D printing technology realized functionalization of path structures. Based on "3D printing first and then functionalization" logic, low-temperature 3D printing technology innovatively combined structure-strength design, 3D printable ability and electrical sensing functions of PVA matrix hydrogels.
一种由低温3D打印机和优化的低温3D打印参数组成的新型实用低温3D打印技术被成功开发。在0至20°C的低温环境下，包括聚乙烯醇-木质素磺酸钠（PVA-LS）水凝胶和聚乙烯醇-羧甲基纤维素（PVA-CMC）水凝胶在内的聚乙烯醇（PVA）基水凝胶表现出特定的低温流变学特性，构建了理论上的低温3D可打印基础。自制的低温3D打印机为低温3D打印技术实现了机械基础。结合辅助路径和支撑部件，高精度地构建了简单和复杂的结构。基于路径结构的自编G代码，还实现了具有高结构强度的分层可变角度结构。在对路径结构进行低温3D打印后，通过还原反应获得的单等离子体银颗粒可以在PVA基水凝胶表面构建优异的电传感功能。在保持原始材料功能属性的前提下，低温3D打印技术实现了路径结构的功能化。基于“先3D打印后功能化”的逻辑，低温3D打印技术创新性地结合了PVA基水凝胶的结构强度设计、3D可打印能力和电传感功能。
