Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 21: Complex Fluids and Colloids II (joint session CPP/DY)
DY 21.6: Vortrag
Dienstag, 13. März 2018, 10:45–11:00, C 264
Microfludic-SANS: Rapid screening and flow processing of complex fluids — •Carlos Lopez1, Takaichi Watanabe2, Marco Adamo3, Andreas Poulos3, Anne Martel4, Lionel Porcar4, and Joao Cabral3 — 1RWTH Aachen University — 2Okayama University — 3Imperial College London — 4Institut Laue Langevin
The coupling of microfluidics and small angle neutron scattering (SANS) is demonstrated. We have developed microfluidic devices with low SANS background and high pressure resistance for the investigation of flow-induced phenomena and high throughput phase mapping of soft matter.
We study the structure of model water-surfactant-oil mixtures under extensional flow and obtain scattering profiles from 50 micron wide channels, with 1 - 300 second acquisition times. The microfluidic geometry enables the variation of both flow type and magnitude, beyond traditional rheo-SANS setups, and is well-suited for complex fluids due to the commensurability of relevant time and lengthscales.
Using an online micromixer we implement a high-throughput approach, scanning in excess of 10 SANS profiles per minute for model surfactant and colloid solutions both in continuous and multiphase (droplet) flow. We show that microfluidic approaches can reduce experimental time and sample volume and considerably improve the accuracy of contrast matching experiments.