Upcoming seminars

Seminars at DIFFER cover a wide range of topics and are held on Thursdays at 11.15 AM in the seminar room of the institute (unless otherwise stated). Seminars are open to everybody. If you are interested in visiting a DIFFER seminar or want to subscribe to our mailing list, please follow the instructions for external visitors.

List all past seminars organized at DIFFER

David Vermaas
November 29th 2018
11:15 to 12:15
abstract will follow soon
Martinus Werts
December 13th 2018
11:15 to 12:15
Nanostructured conductors (for example: gold, silver) interact with electromagnetic waves in fascinating and potentially useful ways; the scientific domain studying this is called plasmonics. Progress in the fabrication of nanomaterials gives access to structures with tailored plasmonic properties. Placing light-absorbing and -emitting molecules near such structures can result in enhancement of specfic photonic properties, enabling more sensitive detection, brighter light emission or increased harvesting of luminous energy, although it can be tricky to achieve this in practice.     Nanoscale structures combining plasmonic materials and molecules can be dispersed in liquid solution. Illustrative are the vivid colours exhibited by solutions of gold and silver nanoparticles of different shapes and sizes. The nanostructures are floating freely in the isotropic liquid environment at low optical densities, and we can precisely measure their interaction with light. Moreover, the liquid (often: water) leads to physical and chemical dynamics (Brownian motion, chemical change) that can be challenging to comprehend, but also offer new opportunities for designing chemical and biological sensors.     We develop and use combinations of optical spectroscopic, videomicroscopic, microfluidic and numerical methods to study, control and exploit molecularly-coated nanoparticles in solution.
Igor Adamovich
December 20th 2018
11:15 to 12:15
The seminar gives an overview of experimental, theoretical, and kinetic modeling studies of molecular energy transfer in high-speed nonequilibrium flows and low-temperature plasmas at the OSU Nonequilibrium Thermodynamics Laboratories. Recent work includes development and operation of a laboratory scale Mach 5 nonequilibrium flow wind tunnel; flow characterization in the supersonic test section using laser diagnostics such as Coherent Anti-Stokes Raman Scattering (N2 CARS), NO PLIF, and NO2 / NO Molecular Tagging Velocimetry (MTV); the effect of vibrational relaxation on the supersonic flow field; development of high frame rate flow diagnostics using a pulse burst laser; and development and use of molecular energy transfer / nonequilibrium air chemistry kinetic models. Ongoing work includes studies of state-specific O2 dissociation / recombination kinetics by ps LIF / Two-Photon Absorption LIF (TALIF) and measurements of excited metastable species in nonequilibrium high-speed flows by Cavity Ring Down Spectroscopy (CRDS).