title: Microscale Marangoni actuation: all-optical and all-electrical methods.
abstract: We present experimental results from an all-optical microfluidic platform that may be complimented by a thin film all-electrical network. Using these configurations we have studied the microfluidic convective flow systems of silicone oil, glycerol, and 1,3,5-trinitrotoluene on open surfaces through the production of surface tension gradients derived from thermal gradients. We show that sufficient localized thermal variation can be created utilizing surface plasmons and/or engaging individually addressable resistive thermal elements. Both studies manipulate fluids via Marangoni forces, each having their unique exploitable advantages. Surface plasmon excitation in metal foils are the driving engine of many physical-, chemical-, and bio-sensing applications. Incorporating, for the first time, the plasmon concept in microfluidics, our results thus demonstrate great potential for simultaneous fluid actuation and sensing.
authors.affiliation: Oak Ridge National Laboratory, Bethel Valley Rd., Bldg. 4500 S, MS 6123, TN 37831, USA.
authors.forename: R H
authors.initials: RH
authors.lastname: Farahi
authors.forename: A
authors.initials: A
authors.lastname: Passian
authors.forename: S
authors.initials: S
authors.lastname: Zahrai
authors.forename: A L
authors.initials: AL
authors.lastname: Lereu
authors.forename: T L
authors.initials: TL
authors.lastname: Ferrell
authors.forename: T
authors.initials: T
authors.lastname: Thundat
mesh_terms: D005990:Glycerol; D006358:Hot Temperature; D020527:Microscopy, Scanning Probe / Q000379:methods*; D012827:Silicone Oils; D013499:Surface Properties; D014303:Trinitrotoluene
chemical_list: D012827:Silicone Oils; D014303:Trinitrotoluene; D005990:Glycerol