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<p class="MsoNormal"><b>From:</b> UH Cullen College of Engineering <ecommunications@uh.edu>
<br>
<b>Sent:</b> Wednesday, September 18, 2024 10:05 AM<br>
<b>To:</b> Nicolette Solano <nsolano2@uh.edu><br>
<b>Subject:</b> Join us for the UH Cullen College Rockwell Lecture Series — Dr. Sanat Kumar, September 27<o:p></o:p></p>
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<a href="https://giving.uh.edu/page.redir?target=https%3a%2f%2fwww.egr.uh.edu&srcid=21972&srctid=1&erid=70b8fea9-e992-4be0-8a0b-858e4e584678&trid=70b8fea9-e992-4be0-8a0b-858e4e584678" target="_blank"><span style="text-decoration:none"><img border="0" width="600" style="width:6.25in" id="_x0000_i1025" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/enews-header-2022.png" alt="University of Houston Cullen College of Engineering"></span></a><o:p></o:p></p>
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<a href="https://giving.uh.edu/page.redir?target=https%3a%2f%2fwww.egr.uh.edu%2four-college%2frockwell-lecture%2f2024%2fsanat-kumar-nae&srcid=21972&srctid=1&erid=70b8fea9-e992-4be0-8a0b-858e4e584678&trid=70b8fea9-e992-4be0-8a0b-858e4e584678" target="_blank"><span style="text-decoration:none"><img border="0" width="600" style="width:6.25in" id="_x0000_i1026" src="https://www.egr.uh.edu/sites/ccoe.egr.uh.edu/files/enews/2024/images/kumar_sanat_email.jpg" alt="Mechanism of Micro and Nanoplastics Formation"></span></a><o:p></o:p></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black">Pradeep Sharma, Ph.D., P.E., Dean of the Cullen College of Engineering, cordially invites you to</span></strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black">THE ROCKWELL LECTURE SERIES:
</span></strong><b><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black"><br>
<strong><span style="font-family:"Arial",sans-serif">ENGINEERING CONVERSATIONS</span></strong></span></b><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<h1 align="center" style="margin:0in;margin-bottom:.0001pt;text-align:center;line-height:29.25pt">
<span style="font-size:19.5pt;font-family:"Arial",sans-serif;color:#C8102E"><a href="https://giving.uh.edu/page.redir?target=https%3a%2f%2fwww.egr.uh.edu%2four-college%2frockwell-lecture%2f2024%2fsanat-kumar-nae&srcid=21972&srctid=1&erid=70b8fea9-e992-4be0-8a0b-858e4e584678&trid=70b8fea9-e992-4be0-8a0b-858e4e584678" target="_blank"><span class="mce-content-body"><span style="color:#C8102E;text-decoration:none">Mechanism
of Micro and Nanoplastics Formation</span></span></a><o:p></o:p></span></h1>
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<span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">Featuring Keynote Speaker:<o:p></o:p></span></p>
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<strong><span style="font-size:16.5pt;font-family:"Arial",sans-serif;color:#101112">Sanat K. Kumar </span></strong><span style="font-size:16.5pt;font-family:"Arial",sans-serif;color:#101112"><o:p></o:p></span></p>
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<em><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">Michael Bykhovsky and Charo Gonzalez-Bykhovsky</span></em><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112"><br>
<em><span style="font-family:"Arial",sans-serif">Professor Of Chemical Engineering</span></em><br>
<em><span style="font-family:"Arial",sans-serif">Columbia University</span></em><o:p></o:p></span></p>
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<span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">Event to be held in person and online.<o:p></o:p></span></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">Friday, September 27, 2024</span></strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112"><o:p></o:p></span></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">10:30 – 11:30 a.m.</span></strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112"><o:p></o:p></span></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">L2D2</span></strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112"><o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><!--[if gte vml 1]><v:roundrect id="_x0000_s1026" href="https://giving.uh.edu/page.redir?target=https%3a%2f%2fwww.egr.uh.edu%2four-college%2frockwell-lecture%2f2024%2fsanat-kumar-nae&srcid=21972&srctid=1&erid=70b8fea9-e992-4be0-8a0b-858e4e584678&trid=70b8fea9-e992-4be0-8a0b-858e4e584678" style='width:46.5pt;height:16.8pt;mso-left-percent:-10001;mso-top-percent:-10001;mso-position-horizontal:absolute;mso-position-horizontal-relative:char;mso-position-vertical:absolute;mso-position-vertical-relative:line;mso-left-percent:-10001;mso-top-percent:-10001;v-text-anchor:middle' arcsize="0" o:button="t" fillcolor="#c8102e" stroked="f">
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<span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">This lecture will be livestreamed for those who are unable to attend in person.<o:p></o:p></span></p>
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<p style="margin:0in;margin-bottom:.0001pt;line-height:18.0pt"><strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112">Sanat Kumar</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112"> received
his B.S. degree in chemical engineering from the Indian Institute of Technology in Chennai in 1981, followed by a Sc.D. from MIT in 1987. After completing a postdoctoral fellowship at IBM Almaden, he served as a faculty member at Penn State University and
Rensselaer Polytechnic Institute. In 2006, he joined the Chemical Engineering Department at Columbia University, where he served as department chair from 2010 to 2016. Kumar’s research encompasses a broad range of polymeric and complex fluid systems, with
a current focus on recycling polymers and mitigating nanoplastics. His work has earned him numerous honors, including visiting distinguished professorships at various international universities and the Polymer Physics Prize from the American Physical Society.<o:p></o:p></span></p>
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<strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112">Lecture Abstract</span></strong><span style="font-size:13.5pt;font-family:"Arial",sans-serif;color:#101112"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112">It is well-established that micro and nanoplastics (MNPLs) are released from polymers through environmentally triggered bond breaking. However, the mechanism by which this Å-level
process leads to nm-</span><span style="font-size:12.0pt;font-family:"Cambria Math",serif;color:#101112">𝜇</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112">m sized fragments is poorly enunciated. Through experimental studies
on three distinct chemistries, we demonstrate that only polymers with a semicrystalline morphology produce MNPLs under quiescent conditions. In this morphology, comprised of alternate crystalline and amorphous domains, chain scission occurs faster in amorphous
regions. Through theoretical arguments, we show that tie molecules and bridging entanglements (“connectors”), which provide structural integrity to the semicrystalline structure by connecting two adjacent crystals, are preferentially broken. We propose that
the cleavage of a threshold amount of connectors (i.e., scission of as little as 1% of chain bonds), leads to the spontaneous release of MNPLs.<o:p></o:p></span></p>
<p style="margin:0in;margin-bottom:.0001pt;line-height:18.0pt"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112">The resulting fragments comprise highly polydisperse stacks of lamellae, with an individual lamella — tens of nanometers
thick — being the building block. Degradation of the crystals occurs over much longer time scales, explaining the environmental persistence of MNPLs, even under non-quiescent conditions. Since ~70 % of polymers are semicrystalline, engineering connectors may
represent an effective strategy to reduce MNPL release rates.<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#101112">Presented by:<o:p></o:p></span></p>
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<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#888B8D">UH Cullen College of Engineering<br>
E421 Engineering Bldg 2, Houston, TX 77204-4007<br>
713-743-7593<br>
The University of Houston is an EEO/AA institution.<o:p></o:p></span></p>
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