Structured surface wetting of a PTFE flow-cell for terahertz spectroscopy of proteins

We have fabricated a terahertz compatible polytetrafluoroethylene (PTFE) based microfluidic flow-cell, in which terahertz time-domain spectroscopy of a range of concentrations of aqueous bovine serum albumin (BSA) was performed, demonstrating the device's suitability for future studies of biomolecular interactions. The novel combination of oxygen plasma treatments and milling was used to both increase and decrease the wettability of the channel and surrounding substrate (to superhydrophobic levels) respectively, producing a stark contrast in contact angles allowing surface tension effects to confine liquid in the channel. PTFE is a chemically inert, bio-compatible material with ideal spectroscopic properties at sub-millimetre wavelengths.

Automated summary

A terahertz-compatible PTFE microfluidic flow-cell was fabricated for spectroscopic analysis of BSA, utilizing oxygen plasma treatments and milling to manipulate wettability for liquid confinement. PTFE's inert and bio-compatible properties make it ideal for sub-millimeter wavelength spectroscopy.