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<p class="MsoNormal"><span style="font-size:14.0pt">There will be a Modern Optics and Spectroscopy Seminar held
<b>today at 12pm </b>in <b><span style="color:red">NE47-189 </span></b></span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red">**Please note location**</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">Katherine (Kallie) Willets</span></b><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:14.0pt">Temple University</span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><i><span style="font-size:14.0pt">“Super-resolution imaging of nanoscale electrochemical phenomena”</span></i></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:14.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:14.0pt">This talk will describe how super-resolution optical imaging can be used to probe nanoscale electrochemical phenomena that are hidden by traditional electrochemical techniques. In the first part of the
talk, we show how we can manipulate the 3-dimensional trajectories of single nanoparticles as they are delivered from a nanopipette to an electrified interface. By balancing the force of the pressure-driven flow from the pipette against an attractive electrostatic
potential at a substrate, we can control nanoparticle motion in real time. To visualize nanoparticle motion, a resistive-pulse electrochemical setup is coupled with an optical microscope, and nanoparticle trajectories are tracked in three-dimensions using
super-resolution imaging to obtain positional information with precision better than 10 nm. In the second part of the talk, we describe how super-resolution imaging and polarization-resolved microscopy reveal heterogeneous oxide formation on the surface of
single silver nanoparticles. By monitoring both the temporal and spatial properties of single particle scattering during electrodissolution, we show how heterogeneous surface oxides impact electrochemical reactions at nanoparticle surfaces.
</span></i><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal">Refreshments will be served immediately following the seminar<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Christine Brooks</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Administrative Assistant</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Massachusetts Institute of Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Department of Chemistry</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">77 Massachusetts Ave, 6-333</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Cambridge, MA 02139</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">p: 617.253.7239</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">e: <a href="mailto:cbrooks@mit.edu">cbrooks@mit.edu</a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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