We demonstrate molding of batches of 12 off-stoichiometry thiol-ene epoxy polymer (OSTE+) polymer parts in a single molding cycle using an adapted reaction injection molding process and the direct bonding of the OSTE+  parts to other OSTE+  substrates, to printed circuit boards, and to QCMs. Our novel approach comprises two key innovations: the batch reaction injection molding of microfluidic parts and the integration of the cartridge components by direct, unassisted bonding. In this work, we present the uncomplicated manufacturing of QCMs in polymer microfluidic cartridges. However, the relatively complex, multi-part design and multi-step fabrication and assembly of state-of-the-art QCM cartridges make them unsuited for disposable applications such as point-of-care (PoC) diagnostics. Quartz crystal microbalance (QCM) sensing is an established technique commonly used in laboratory based life-science applications. Haraldsson, Tommy van der Wijngaart, Wouter Sandström, Niklas Zandi Shafagh, Reza Gylfason, Kristinn B. Accordingly, the investigation was directed toward determining whether certain combinations of (1) refractory alloy compositions, (2) VPS parameters, and (3) heat-treatment parameters could result in VPS- fabricated components with increased ductility.īatch fabrication of polymer microfluidic cartridges for QCM sensor packaging by direct bonding Taken by itself, the basic concept of fabricating furnace cartridges by VPS of refractory materials onto graphite mandrels is not new taken by itself, the basic concept of heat treatment of VPS deposits for use as other than furnace cartridges is also not new however, prior to this investigation, experimental crucibles and furnace cartridges fabricated by VPS had not been heat treated and had been found to be relatively weak and brittle. Scott McKechnie, Timothy N.Īn experimental investigation has shown that by (1) vacuum plasma spraying (VPS) of suitable refractory metal alloys on graphite mandrels, and then (2) heat-treating the VPS alloy deposits under suitable conditions, it is possible to fabricate improved crucibles and furnace cartridges that could be used at maximum temperatures between 1,400 and 1,600 C and that could withstand chemical attack by the materials to be heated in the crucibles and cartridges. Better VPS Fabrication of Crucibles and Furnace Cartridges
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