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Dear ChBE Graduate Students and Postdocs,</div>
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On Friday September 27, our Departmental seminar will be part of the Rockwell Lecture Series of the College.</div>
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The details of the <b>Rockwell Lecture by Professor Sanat Kumar</b> of Columbia University can be found below.</div>
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Please <b>register</b> and <b>attend in person</b>. The livestream option is only for people outside the Department.</div>
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The audience will also include people from other Departments, nearby Universities, and industry.</div>
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This is a seminar for which you should really make an effort to <b>be <u>inside</u> the Auditorium by 10:15 am</b>!</div>
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All the best,</div>
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Lakis</div>
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<span style="font-family: Calibri, sans-serif; color: black;">---------------------------------------------------------------------------------------------------</span></p>
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<span style="font-family: Calibri, sans-serif; color: black;">T.J. (Lakis) Mountziaris, Ph.D.</span></p>
<p style="text-align: left; background-color: white; margin: 0px; font-family: "Times New Roman", serif; font-size: 12pt;">
<span style="font-family: Calibri, sans-serif; color: black;">William A. Brookshire Professor and Department Chair</span></p>
<p style="text-align: left; background-color: white; margin: 0px; font-family: "Times New Roman", serif; font-size: 12pt;">
<span style="font-family: Calibri, sans-serif; color: black; background-color: white;">William A. Brookshire Department of Chemical & Biomolecular Engineering</span></p>
<p style="text-align: left; background-color: white; margin: 0px; font-family: "Times New Roman", serif; font-size: 12pt;">
<span style="font-family: Calibri, sans-serif; color: black; background-color: white;">University of Houston</span></p>
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<span style="font-family: Calibri, sans-serif; color: black; background-color: white;">Houston, TX, USA</span></p>
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<span style="font-family: Calibri, sans-serif; color: black; background-color: white;">Email: tjmountz@central.uh.edu</span></p>
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<span style="font-family: Calibri, sans-serif; color: black; background-color: white;">Cell: 716-812-8144</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Cullen College of Engineering <uhecomm@uh.edu><br>
<b>Sent:</b> Wednesday, September 11, 2024 2:06 PM<br>
<b>To:</b> Mountziaris, Triantafillos J <tjmountz@Central.UH.EDU><br>
<b>Subject:</b> Join us for UH Cullen College Rockwell Lecture Series- September 27</font>
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<div style="max-width:600px"><a href="https://urldefense.com/v3/__https://z8nqksp7.r.us-west-2.awstrack.me/L0/https:*2F*2Fcloudapps.uh.edu*2Fsendit*2Fl*2F4fPA88927wVlXPUzuNQ60qsA*2FbtsS5efWwH763pVzSZgwjSpg*2FIimJOEeGKppuw2KWiVhIjw/1/01010191e27a8108-3b3aea45-28f3-4c56-be83-09d8bfafc5d1-000000/0BplytzNoNshhaNcq2wNwZ1DmJ0=392__;JSUlJSUlJQ!!LkSTlj0I!ELNgm6VNY1r5gtlGMsP8Ca3Tv8mb6w4Sb8kv305mzHPt4jqek6C9R3MVFONTKk7UrIRo0aGXqHZted0_KiCd1B8$" tabindex="-1" target="_blank" style="outline:none"><img alt="University of Houston Cullen College of Engineering" height="auto" title="University of Houston Cullen College of Engineering" width="600" style="display:block; height:auto; border:0; width:100%" src="https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/enews-header-2022.png"></a></div>
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<div style="max-width:600px"><a href="https://urldefense.com/v3/__https://z8nqksp7.r.us-west-2.awstrack.me/L0/https:*2F*2Fcloudapps.uh.edu*2Fsendit*2Fl*2F4fPA88927wVlXPUzuNQ60qsA*2FJoAis0d97g3A8058qg4dxg*2FIimJOEeGKppuw2KWiVhIjw/1/01010191e27a8108-3b3aea45-28f3-4c56-be83-09d8bfafc5d1-000000/JwTuSTJbwAwmo-KTKmImqDTsOPE=392__;JSUlJSUlJQ!!LkSTlj0I!ELNgm6VNY1r5gtlGMsP8Ca3Tv8mb6w4Sb8kv305mzHPt4jqek6C9R3MVFONTKk7UrIRo0aGXqHZted0_ICqo8RM$" tabindex="-1" target="_blank" style="outline:none"><img alt="Mechanism of Micro and Nanoplastics Formation" height="auto" title="Mechanism of Micro and Nanoplastics Formation" width="600" style="display:block; height:auto; border:0; width:100%" src="https://www.egr.uh.edu/sites/ccoe.egr.uh.edu/files/enews/2024/images/kumar_sanat_email.jpg"></a></div>
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<p style="margin:0"><strong>Pradeep Sharma, Ph.D., P.E., Dean of the Cullen College of Engineering, cordially invites you to</strong></p>
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<p style="margin:0"><strong>THE ROCKWELL LECTURE SERIES:<br>
ENGINEERING CONVERSATIONS</strong></p>
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<a href="https://urldefense.com/v3/__https://z8nqksp7.r.us-west-2.awstrack.me/L0/https:*2F*2Fcloudapps.uh.edu*2Fsendit*2Fl*2F4fPA88927wVlXPUzuNQ60qsA*2FJoAis0d97g3A8058qg4dxg*2FIimJOEeGKppuw2KWiVhIjw/2/01010191e27a8108-3b3aea45-28f3-4c56-be83-09d8bfafc5d1-000000/GR1r3m8dG_uyrq12fMt1XfNKPWw=392__;JSUlJSUlJQ!!LkSTlj0I!ELNgm6VNY1r5gtlGMsP8Ca3Tv8mb6w4Sb8kv305mzHPt4jqek6C9R3MVFONTKk7UrIRo0aGXqHZted0_S3mwN6g$" rel="noopener" target="_blank" style="text-decoration:none; color:#c8102e"><span class="x_mce-content-body x_mce-edit-focus" data-position="30-0-3" data-qa="tinyeditor-root-element" id="x_bca25653-6ed4-4e27-b872-cf69b45175fe" style="word-break:break-word">Mechanism
of Micro and Nanoplastics Formation</span></a></h1>
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<p style="margin:0">Featuring Keynote Speaker:</p>
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<p style="margin:0"><strong>Sanat K. Kumar</strong><strong> </strong></p>
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<p style="margin:0"><em>Michael Bykhovsky and Charo Gonzalez-Bykhovsky</em><br>
<em>Professor Of Chemical Engineering</em><br>
<em>Columbia University</em></p>
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<p style="margin:0">Event to be held in person and online.</p>
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<p style="margin:0"><strong>Friday, September 27, 2024</strong></p>
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<p style="margin:0"><strong>10:30 – 11:30 a.m.</strong></p>
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<p style="margin:0"><strong><strong>L2D2</strong></strong></p>
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<div align="center" class="x_alignment"><a href="https://urldefense.com/v3/__https://z8nqksp7.r.us-west-2.awstrack.me/L0/https:*2F*2Fcloudapps.uh.edu*2Fsendit*2Fl*2F4fPA88927wVlXPUzuNQ60qsA*2FJoAis0d97g3A8058qg4dxg*2FIimJOEeGKppuw2KWiVhIjw/3/01010191e27a8108-3b3aea45-28f3-4c56-be83-09d8bfafc5d1-000000/ORq-fcdUleAH2CimVoiu-QBMCcI=392__;JSUlJSUlJQ!!LkSTlj0I!ELNgm6VNY1r5gtlGMsP8Ca3Tv8mb6w4Sb8kv305mzHPt4jqek6C9R3MVFONTKk7UrIRo0aGXqHZted0_m6taaxc$" target="_blank" style="background-color:#c8102e; border-bottom:0px solid transparent; border-left:0px solid transparent; border-radius:0px; border-right:0px solid transparent; border-top:0px solid transparent; color:#ffffff; display:inline-block; font-family:Arial,'Helvetica Neue',Helvetica,sans-serif; font-size:18px; font-weight:400; padding-bottom:10px; padding-top:10px; text-align:center; text-decoration:none; width:auto; word-break:keep-all"><span style="word-break:break-word; padding-left:20px; padding-right:20px; font-size:18px; display:inline-block; letter-spacing:normal"><span style="word-break:break-word; line-height:36px"><strong>Register
Now</strong></span></span></a></div>
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<p style="margin:0">This lecture will be livestreamed for those who are unable to attend in person.</p>
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<p style="margin:0"><strong>Sanat Kumar</strong> 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.</p>
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<p style="margin:0"><strong>Lecture Abstract</strong></p>
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<p style="margin:0; margin-bottom:16px">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-𝜇m 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.</p>
<p style="margin:0">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.</p>
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<p style="margin:0">Presented by:</p>
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<p style="margin:0">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.</p>
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