TY  - JOUR
AU  - Yang, Mingcheng
AU  - Ripoll, Marisol
TI  - Thermoosmotic microfluidics
JO  - Soft matter
VL  - 12
IS  - 41
SN  - 1744-6848
CY  - London
PB  - Royal Soc. of Chemistry
M1  - FZJ-2016-06075
SP  - 8564 - 8573
PY  - 2016
AB  - Microchannels with asymmetrically ratcheted walls are here shown to behave as effective and versatile microfluidic pumps if locally heated. When the boundary walls have different temperatures, the confined liquid experiences a temperature gradient along the sawtooth edges, which can induce a thermoosmotic flow. A mesoscale molecular simulation approach is here employed to investigate the flows which are contrasted using an analytical approach. Microchannels can be composed by one or two ratcheted walls which can be straight or cylindrical. Varying the channel geometry can not only change the overall fluid flux, but also vary the flow patters from shear to capillary type, or even to extensional type flows. This scheme does not require multiphase fluids or any movable channel parts, although they are possible to be implemented. The proposed principle is then very versatile to locally manipulate complex fluids, and a promising tool to recover waste heat, to facilitate cooling of microchips, and to manufacture portable lab-on-a-chip devices
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000386247100013
C6  - 27714370
DO  - DOI:10.1039/C6SM01692H
UR  - https://juser.fz-juelich.de/record/820808
ER  -