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Microfluidic-SANS: flow processing of complex fluids
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DOI：10.1038/srep07727.png)
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Abstract
En 中文
Understanding and engineering the flow-response of complex and non-Newtonian fluids at a molecular level is a key challenge for their practical utilisation. Here we demonstrate the coupling of microfluidics with small angle neutron scattering (SANS). Microdevices with high neutron transmission (up to 98%), low scattering background (less than or similar to 10(-2) cm(-1)), broad solvent compatibility and high pressure tolerance (approximate to 3-15 bar) are rapidly prototyped via frontal photo polymerisation. Scattering from single microchannels of widths down to 60 mu m, with beam footprint of 500 mu m diameter, was successfully obtained in the scattering vector range 0.01-0.3 angstrom(-1), corresponding to real space dimensions of similar or equal to 10-600 angstrom. We demonstrate our approach by investigating the molecular re-orientation and alignment underpinning the flow response of two model complex fluids, namely cetyl trimethylammonium chloride/pentanol/D2O and sodium lauryl sulfate/octanol/brine lamellar systems. Finally, we assess the applicability and outlook of microfluidic-SANS for high-throughput and flow processing studies, with emphasis of soft matter.
Keywords:
LYOTROPIC LAMELLAR PHASE
TRANSITIONS
SCATTERING
DROPLETS
DEVICES
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