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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Wetting, Fluidics and Liquids at Interfaces and Surfaces (joint session CPP/DY)

CPP 20.7: Vortrag

Dienstag, 2. April 2019, 11:30–11:45, H13

Raman spectroscopic evaluation of concentration gradients in small drops in binary mixtures on different substrates and in 3d printed small channels — •Alena Bell and Robert Stark — Physics of Surfaces, Materialwissenschaften, TU Darmstadt, Alarich-Weiss-Str. 16, 64287 Darmstadt, Deutschland

The evaluation of concentration gradients plays a big role in medical technology and chemotaxis. Microchannels are used in lab-on-chip devices for quick tests to test fluids directly, for example. Microchannels are also used for chemotaxis applications to mix fluids. The amount of liquid which is needed for these tests is in the microliter range. Raman spectroscopy is a powerful technique to detect changes in molecular structures within reactions in lab-on-chip devices and in chemotaxis devices. Therefore, different fluids are directed through 3d printed channels and changes are measured via Raman spectroscopy. In a first step, these generated fluid mixtures are measured as drops on different substrates. The concentration gradients that build up in the mixtures is measured in the drops. In the next step the gradients are measured in small channels. The concentration gradients are calculated by comparing relative peak intensities and correlating these results with calibration curves.