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<p class="MsoNormal"><a name="_Hlk152055189"><b><span lang="EN-US" style="font-size:24.0pt;line-height:105%;color:black">SmallTalk
</span></b></a><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US" style="font-size:14.0pt;line-height:105%;color:black">[about Nanoscience]</span></b></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US" style="color:black">On Monday </span></b></span><span style="mso-bookmark:_Hlk152055189"><b><span lang="EN-US">March 4th
</span></b></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">at 15.00h</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US">
<span style="color:black">we welcome you all to our SmallTalk seminar series. You are welcome to join us in lecture hall <b>Kollektorn, MC2 with fika</b> or on zoom.<o:p></o:p></span></span></span></p>
<h1><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black;font-weight:normal">Our speaker is
</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black">Pantea Dara</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black;font-weight:normal">, Doctoral
Student, Nano and Biophysics, Physics. The seminar is titled “</span></span><span style="mso-bookmark:_Hlk152055189"><span class="text-normal"><span lang="EN-US" style="font-size:11.0pt;font-weight:normal">Controlling fluid flow direction in microfluidic
systems through photothermal effects</span></span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;color:black;font-weight:normal">”.</span></span><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="font-size:11.0pt;font-weight:normal"><o:p></o:p></span></span></h1>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Abstract:<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">In microfluidic environments, the transport of particles is typically governed by slow diffusion near interfaces. However, the introduction of localized fluid
flow allows for active transport of suspended nano-objects within confined spaces. To achieve precise and dynamic control over fluid flow at the microscale, a promising approach is to harness photothermal effects by illuminating metallic or all-dielectric
nanostructures. Previous research has demonstrated the induction of strong flow transients, with flow speeds reaching millimeters per second, when microscopic vapor bubbles nucleate on spatially isolated laser-heated plasmonic nanoantennas supported on a substrate.
Nevertheless, in such structures, the flow pattern is cylindrically symmetric and always directed toward the nanoantenna at the substrate plane, limiting its applicability in, for example, particle manipulation schemes. In this context, we investigate the
potential to manipulate the flow direction by adjusting the absorption characteristics of these metallic or dielectric nanostructures. Our research has shown that the flow direction can be locally reversed by breaking the photothermal symmetry using two nearby
nanoantennas that differ either in size or polarization response. The in-plane flow transient is strong enough to push microparticles tens of microns across a surface. Directional flow control may offer a means for rapid and precise mass transport near surfaces,
with applications in microfluidics, bionanotechnology, and particle sorting.The seminar is divided into two parts, where the first part consists of a pure overview of the field and is held on a generally accessible level (10<span class="apple-converted-space"> </span>min).
The second part will be more technical (15-20 minutes).<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align:justify"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Looking forward to seeing you live or on Zoom:
</span></span><a href="https://chalmers.zoom.us/j/61929604403#success"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US">https://chalmers.zoom.us/j/61929604403#success</span></span><span style="mso-bookmark:_Hlk152055189"></span></a><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Best regards, <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk152055189"><span lang="EN-US" style="color:black">Angela, Nils, Christoph, and Janine</span></span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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