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Dear all,
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<div class="">It will my pleasure to announce Sharon's licentiate thesis seminar. Link to event: </div>
<div class=""><a href="https://www.albanova.se/event/licenciate-thesis-defense-the-role-of-molecular-heterogeneity-in-the-structural-dynamics-of-aqueous-solutions/" class="">https://www.albanova.se/event/licenciate-thesis-defense-the-role-of-molecular-heterogeneity-in-the-structural-dynamics-of-aqueous-solutions/</a> </div>
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<div class=""><b class="">When: </b>March 31st, 14:00</div>
<div class=""><b class="">IRL: </b>Mega, 6228 (house 3)</div>
<div class=""><b class="">Zoom: </b><a href="https://stockholmuniversity.zoom.us/j/66915127848" target="_BLANK" class="">https://stockholmuniversity.zoom.us/j/66915127848</a> </div>
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<div class=""><b class="">The Role of Molecular Heterogeneity in the Structural Dynamics of Aqueous Solutions</b></div>
<div class=""><span class="read-more-text">Aqueous solutions constitute the basis of life, yet their complex and anomalous nature is far from well-understood. Transient molecular ordering gives rise to microscopic spatial liquid heterogeneities and fluctuations
which are believed to play a key role in biochemical processes as well as in pure water, the latter of which could fundamentally alter our view on water as life’s solvent. In this thesis, we experimentally investigate the structural dynamics in aqueous solutions
with the aim to understand the role of molecular heterogeneity in the complex solution dynamics. To extract dynamic information, we utilize coherent light- and X-ray scattering techniques, such as dynamic light scattering (DLS) and X-ray photon correlation
spectroscopy (XPCS), which can resolve structural dynamics on a broad range of length and time scales. We explore the influence of hypothesized water fluctuations in the dynamics of simple model solutes, finding that their diffusive dynamic behaviour is effectively
similar and independent of solute size down to molecular scale, whilst significantly different from that of single water molecules. Secondly, in a first proof-of-concept experiment, we successfully combine the spatial resolution of nanofocused coherent X-ray
beams with dynamic measurements by XPCS, the results of which indicate that `nano-XPCS’ could prove a valuable tool in the quest to resolve nanoscale fluctuations. Finally, an outlook is given where the next steps in these investigations are discussed, such
as the use of aqueous-organic mixtures as model systems for spatially heterogeneous dynamics in biological solutions.</span></div>
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<div class="">Best wishes,</div>
<div class="">Fivos</div>
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<div>Fivos Perakis<br class="">
Physics Department<br class="">
Stockholm University<br class="">
<a href="http://su.se/english/profiles/fpera-1.260748" target="_BLANK" class="">su.se/english/profiles/fpera-1.260748</a> </div>
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