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<p class="MsoNormal"><span style="font-size:15.0pt">There will be a <b><span style="color:red">virtual</span></b><span style="color:red">
</span>Modern Optics and Spectroscopy Seminar held <b>today at 12pm. </b>A Q&A segment will immediately follow the conclusion of the seminar.</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><i><span style="font-size:15.0pt">Zoom link:</span></i></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:15.0pt;color:red"><a href="https://mit.zoom.us/j/9149285728?pwd=SEl2Tk16enVPaGlWK3BQQlJzeXJjdz09"><span style="color:red">https://mit.zoom.us/j/9149285728?pwd=SEl2Tk16enVPaGlWK3BQQlJzeXJjdz09</span></a></span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:15.0pt">Password: ChenMOS</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:15.0pt">__________________________</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:18.0pt">Peng Chen</span></b><b><span style="font-size:17.0pt"><br>
Cornell University</span></b><i><span style="font-size:14.0pt"><br>
<br>
</span></i><b><span style="font-size:18.0pt">“<span style="color:black">Single-molecule catalysis: nanoparticles and polymers</span>”</span></b><o:p></o:p></p>
<p class="MsoNormal" style="text-align:justify"><br>
<i>This presentation will describe our efforts in developing and applying single-molecule approaches to study catalysis, focusing on two stories. The first story will be about our single-molecule fluorescence imaging work on the catalytic properties of individual
nanoparticles at single-turnover resolution and nanometer precision. I will describe the insights we gained into the catalytic activity and dynamics of individual metal nanoparticles, and the surprising spatial and temporal activity patterns and dynamics within
single nanocatalysts. The second story will be about our work in using magnetic tweezers to track single polymer growth in real time under living polymerization catalysis conditions. I will describe how the real-time growth dynamics of single polymers reveal
the formation and unraveling of nonequilibrium conformational entanglements that play key roles in the polymerization kinetics and kinetic dispersion among individual polymers.</i><o:p></o:p></p>
<p class="AbstractSummary" style="margin-top:0in;text-align:justify"><b><i><span style="font-family:"Calibri",sans-serif">Key references:</span></i></b><o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">W. Xu, J. S. Kong, Y.-T. E. Yeh, P. Chen* "Single-Molecule Nanocatalysis Reveals Heterogeneous Reaction Pathways and Catalytic Dynamics" Nature Mater.
<b>2008</b>, 7, 992-996.</span></i><o:p></o:p></li><li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">X. Zhou, N. M. Andoy, G. Liu, E. Choudhary, K.-S. Han, H. Shen, P. Chen* "Quantitative Super-resolution Imaging Uncovers Reactivity Patterns on Single Nanocatalysts" Nature Nanotech.
<b>2012</b>, 7, 237–241.</span></i><o:p></o:p></li><li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">J. B. Sambur, T.-Y. Chen, E. Choudhary, G. Chen, E. J. Nissen, E. M. Thomas, N. Zou, P. Chen* "Sub-particle reaction and photocurrent mapping to optimize catalyst-modified photoanodes" Nature
<b>2016</b>, 530, 77-80.</span></i><o:p></o:p></li><li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">C. Liu, K. Kubo, E. Wang, K.-S. Han, F. Yang, G. Chen, F. A. Escobedo,* G. W. Coates,* P. Chen* "Single polymer growth dynamics" Science
<b>2017</b>, 358, 352-355.</span></i><o:p></o:p></li><li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">N. Zou, X. Zhou, G. Chen, N. M. Andoy, W. Jung, G. Liu, P. Chen* "Cooperative communication within and between single nanocatalysts" Nature Chem.
<b>2018</b>, 10, 607-614.</span></i><o:p></o:p></li><li class="AbstractSummary" style="margin-top:0in;margin-left:-.25in;text-align:justify;mso-list:l0 level1 lfo3;layout-grid-mode:char">
<i><span style="font-family:"Calibri",sans-serif">X. Mao, C. Liu, M. Hesari, N. Zou, P. Chen* "Super-resolution imaging of nonfluorescent reactions via competition"
</span></i><em><span style="font-family:"Calibri",sans-serif;font-style:normal">Nature Chem.</span></em><i><span style="font-family:"Calibri",sans-serif">
<b>2019</b>, </span></i><em><span style="font-family:"Calibri",sans-serif;font-style:normal">11</span></em><i><span style="font-family:"Calibri",sans-serif">, 687-694.</span></i><o:p></o:p></li></ol>
<p class="MsoNormal" style="text-indent:.25in"> <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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