title: High-pressure needle interface for thermoplastic microfluidics.
abstract: A robust and low dead volume world-to-chip interface for thermoplastic microfluidics has been developed. The high pressure fluidic port employs a stainless steel needle inserted into a mating hole aligned to an embedded microchannel, with an interference fit used to increase pressure resistance. Alternately, a self-tapping threaded needle screwed into a mating hole is also demonstrated. In both cases, the flat bottom needle ports seat directly against the microchannel substrate, ensuring low interfacial dead volumes. Low dispersion is observed for dye bands passing the interfaces. The needle ports offer sufficient pull-out forces for applications such as liquid chromatography that require high internal fluid pressures, with the epoxy-free interfaces compatible with internal microchannel pressures above 40 MPa.
authors.affiliation: Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.
authors.forename: C F
authors.initials: CF
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: L P
authors.initials: LP
authors.lastname: Hromada
authors.forename: C W
authors.initials: CW
authors.lastname: Tsao
authors.forename: C C
authors.initials: CC
authors.lastname: Chang
authors.forename: D L
authors.initials: DL
authors.lastname: DeVoe
mesh_terms: D044085:Microfluidics / Q000295:instrumentation*; D009339:Needles; D011312:Pressure