Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska Dolina, Ilkovicova 6, 84215Bratislava 4, Slovakia.
J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejskova 3, 18223Prague, Czech Republic.
Anal Chem. 2022 Oct 18;94(41):14426-14433. doi: 10.1021/acs.analchem.2c03191. Epub 2022 Oct 6.
Fused deposition modeling 3D printing (FDM-3DP) employing electrically conductive filaments has recently been recognized as an exceptionally attractive tool for the manufacture of sensing devices. However, capabilities of 3DP electrodes to measure electric properties of materials have not yet been explored. To bridge this gap, we employ bimaterial FDM-3DP combining electrically conductive and insulating filaments to build an integrated platform for sensing conductivity and permittivity of liquids by impedance measurements. The functionality of the device is demonstrated by measuring conductivity of aqueous potassium chloride solution and bottled water samples and permittivity of water, ethanol, and their mixtures. We further implement an original idea of applying impedance measurements to investigate dimensions of 3DP channels as base structures of microfluidic devices, complemented by their optical microscopic analysis. We demonstrate that FDM-3DP allows the manufacture of microchannels of width down to 80 μm.
熔融沉积成型 3D 打印（FDM-3DP）采用导电丝材，最近已被公认为制造传感设备的一种极具吸引力的工具。然而，3DP 电极测量材料电性能的能力尚未得到探索。为了弥补这一空白，我们采用双材料 FDM-3DP，结合导电和绝缘丝材，通过阻抗测量构建一个集成平台，用于感测液体的电导率和介电常数。通过测量水溶液氯化钾溶液和瓶装水样品的电导率以及水、乙醇及其混合物的介电常数，验证了该器件的功能。我们进一步提出了一个新颖的想法，即在应用阻抗测量来研究 3DP 通道的尺寸作为微流控器件的基础结构，同时辅以光学显微镜分析。我们证明 FDM-3DP 允许制造宽度低至 80μm 的微通道。
