We report novel, low-cost, high-temperature compatible, high-pressure compatible, and chemically resistant additively manufactured microfluidics. The devices were monolithically fabricated by extruding silver clay with a fused filament fabrication 3D printer frame fitted with a syringe extruder, followed by annealing at 885 °C in air. Analysis of the printable feedstock shows that the green material is an alloy composed of silver and copper microparticles blended with an organic binder matrix, while analysis of printed and annealed samples shows that the material is completely free of binder and compatible with at least 800 °C operation. Characterization of the thermal, electrical, and mechanical properties of printed and annealed structures yields values close to those of bulk sterling silver, except for a significantly smaller Young’s modulus. Metrology of test structures evidences linearity between printed dimensions and computer-aided design values. Layers as thin as $150~\mu \text{m}$ and working, watertight closed channels as narrow as $200~\mu \text{m}$ were consistently resolved. A proof-of-concept microfluidic that catalytically decomposes hydrogen peroxide was designed, fabricated, and characterized; the experimental performance of the catalytic microreactor is in agreement with reduced-order modeling. [2019-0267]

中文翻译：

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通过银粘土挤出增材制造坚固的微流体

我们报告了新颖、低成本、高温兼容、高压兼容且耐化学腐蚀的增材制造微流体。这些设备是通过用装有注射器挤出机的熔融长丝制造 3D 打印机框架挤出银粘土来整体制造的，然后在空气中在 885°C 下退火。对可印刷原料的分析表明，绿色材料是一种由银和铜微粒与有机粘合剂基质混合而成的合金，而对印刷和退火样品的分析表明，该材料完全不含粘合剂，并且与至少 800°C 兼容手术。印刷和退火结构的热、电和机械特性的表征产生的值接近散装纯银的值，除了明显较小的杨氏模量。测试结构的计量证明印刷尺寸和计算机辅助设计值之间的线性关系。薄至 $150~\mu\text{m}$ 的层和窄至 $200~\mu\text{m}$ 的工作水密封闭通道始终得到解决。设计、制造和表征了一种催化分解过氧化氢的概念验证微流体；催化微反应器的实验性能与降阶模型一致。[2019-0267] 催化微反应器的实验性能与降阶模型一致。[2019-0267] 催化微反应器的实验性能与降阶模型一致。[2019-0267]