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SUMMARY:EPFL BioE Talks SERIES  "Exploring the Binding of Ions to Polymers
  in Aqueous Salt Solutions"
DTSTART:20220926T160000
DTEND:20220926T170000
DTSTAMP:20260511T204804Z
UID:7285d74522a9d7ba5e8a06ca4b0ff44853536cc2a12666974984d00a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Paul S. Cremer\, Department of Chemistry and Department 
 of Biochemistry and Molecular Biology\, Penn State University\, University
  Park\, PA (USA)\nWEEKLY EPFL BIOE TALKS SERIES\n\nAbstract:\nHofmeister s
 eries chemistry has been a focus of both fundamental and industrial intere
 st since it was first discovered over 130 years ago. It can be shown that 
 a wide variety of physical phenomena follow a recurring rank ordering for 
 both cations and anions when water\, organic molecules and salts are mixed
 . Examples include the hydrophobic collapse and aggregation of macromolecu
 les\, the turnover rate of enzymes\, the pickling of cucumbers\, and even 
 the transfer of charge between ice particles in a lightning storm. Using a
  combination of spectroscopic techniques\, thermodynamic measurements as w
 ell as simulations\, it is now possible to elucidate key molecular level d
 etails of Hofmeister series behavior. In this presentation\, the solubilit
 y of thermoresponsive polymers in the presence of salts will be discussed.
  The results show that weakly hydrated anions bind along polymer chains in
  locations where the hydrogen bonding is most greatly disrupted. Curiously
 \, this makes shorter oligomers less soluble compared to longer polymers p
 ossessing the same chemical constituents. Moreover\, weakly hydrated anion
 s interact more strongly than cations with uncharged polymer chains. In fa
 ct\, metal cations rarely come to the polymer/water interface without bein
 g accompanied by counter anions.\n\nReferences:\n1. Weakly hydrated anions
  bind to polymers but not monomers in aqueous solutions\nBradley A. Rogers
 \, Halil I. Okur\, Chuanyu Yan\, Tinglu Yang\, Jan Heyda\, Paul S. Cremer\
 nNat. Chem. 14 (2022)\, 40-45\n2. The Molecular Mechanism for the Interact
 ions of Hofmeister Cations with Macromolecules in Aqueous Solution\nEllen 
 E. Bruce\, Halil I. Okur\, Sina Stegmaier\, Chad I. Drexler\, Bradley A. R
 ogers\, Nico F. A. van der Vegt\, Sylvie\nRoke\, Paul S. Cremer\nJ. Am. Ch
 em. Soc.\, 142 (2020) 19094-19100\n\n\nBio:\nPaul S. Cremer is the J. Lloy
 d Huck Chair in Natural Sciences at the Pennsylvania State University wher
 e he holds appointments in both the Department of Chemistry and the Depart
 ment of Biochemistry and Molecular Biology. Prof. Cremer received his unde
 rgraduate degree from the University of Wisconsin – Madison (1990) and h
 is Ph.D. from the University of California - Berkeley (1996) working with 
 Prof. Gabor A. Somorjai as his thesis advisor.  He spent two years as the
  Irving S. Sigal Postdoctoral Fellow at Stanford University in the laborat
 ory of Steven G. Boxer before starting his independent research career at 
 Texas A&M University in 1998. He stayed at A&M for over 14 years\, where h
 e was named Distinguished Professor in 2012. The following year his labora
 tory moved to Penn State. He is a fellow of the American Association for t
 he Advancement of Science as well as of the American Chemical Society. In 
 2017\, he was named a Langmuir Lecturer by the ACS.  His group works at t
 he cross-roads of physical chemistry\, biological chemistry\, materials sc
 ience\, and analytical chemistry.\n\n\n\nZoom link (with one-time registra
 tion for the whole series) for attending remotely: https://go.epfl.ch/EPFL
 BioETalks\n\n\nInstructions for 1st-year Ph.D. students who are under EDBB
 ’s mandatory seminar attendance rule:\nIF you are not attending in-perso
 n in the room\, please make sure to\n\n	send D. Reinhard a note before noo
 n on seminar day\, informing that you plan to attend the talk online\, and
 \n	be signed in on Zoom with a recognizable user name (not a pseudonym mak
 ing it difficult or impossible to be identified).\n\nStudents attending th
 e seminar in-person should collect a confirmation signature after the talk
  - please print your own signature sheet beforehand (71 kB pdf available f
 or download here).\n\n 
LOCATION:SV 1717 https://plan.epfl.ch/?room==SV%201717 https://go.epfl.ch/
 EPFLBioETalks
STATUS:CONFIRMED
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