García-Ávila Josué, Rodríguez Ciro A, Vargas-Martínez Adriana, Ramírez-Cedillo Erick, Martínez-López J Israel
Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Monterrey 64849, Mexico.
Laboratorio Nacional de Manufactura Aditiva y Digital (MADiT), Apodaca 66629, Mexico.
Materials (Basel). 2021 Dec 30;15(1):256. doi: 10.3390/ma15010256.
The strategy of embedding conductive materials on polymeric matrices has produced functional and wearable artificial electronic skin prototypes capable of transduction signals, such as pressure, force, humidity, or temperature. However, these prototypes are expensive and cover small areas. This study proposes a more affordable manufacturing strategy for manufacturing conductive layers with 6 × 6 matrix micropatterns of RTV-2 silicone rubber and Single-Walled Carbon Nanotubes (SWCNT). A novel mold with two cavities and two different micropatterns was designed and tested as a proof-of-concept using Low-Force Stereolithography-based additive manufacturing (AM). The effect SWCNT concentrations (3 wt.%, 4 wt.%, and 5 wt.%) on the mechanical properties were characterized by quasi-static axial deformation tests, which allowed them to stretch up to ~160%. The elastomeric soft material's hysteresis energy (Mullin's effect) was fitted using the Ogden-Roxburgh model and the Nelder-Mead algorithm. The assessment showed that the resulting multilayer material exhibits high flexibility and high conductivity (surface resistivity ~7.97 × 10 Ω/sq) and that robust soft tooling can be used for other devices.
将导电材料嵌入聚合物基体的策略已制造出能够传导压力、力、湿度或温度等信号的功能性可穿戴人造电子皮肤原型。然而，这些原型成本高昂且覆盖面积小。本研究提出了一种更经济实惠的制造策略，用于制造具有室温硫化硅橡胶（RTV-2）和单壁碳纳米管（SWCNT）6×6矩阵微图案的导电层。设计并测试了一种具有两个型腔和两种不同微图案的新型模具，作为基于低力立体光刻的增材制造（AM）概念验证。通过准静态轴向变形试验表征了SWCNT浓度（3 wt.%、4 wt.%和5 wt.%）对机械性能的影响，该试验使材料能够拉伸至约160%。使用奥格登-罗克斯堡模型和 Nelder-Mead 算法拟合了弹性体软材料的滞后能量（穆林效应）。评估表明，所得多层材料具有高柔韧性和高导电性（表面电阻率约为7.97×10Ω/sq），并且坚固的软模具可用于其他设备。
