BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:iCalendar-Ruby BEGIN:VEVENT CATEGORIES:Lectures & Presentations DESCRIPTION:Chemistry & Biochemistry Colloquium | Exploring the Binding of Ions to Polymers in Aqueous Salt Solutions\, April 18\n\n \n\nThe Chemistry & Biochemistry Colloquium Series features Dr. Paul Cremer discussing "Expl oring the Binding of Ions to Polymers in Aqueous Salt Solutions" on April 1 8 at 4:10 p.m. in Walter 245.\n\n \n\nCremer is the J. Lloyd Huck Professo r of Chemistry and of Biochemistry and Molecular Biology in the Eberly Coll ege of Science at Penn State University.\n\n \n\nAbstract: Hofmeister serie s chemistry has been a focus of both fundamental and industrial interest si nce 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 ca tions and anions when water\, organic molecules and salts are mixed. Exampl es include the hydrophobic collapse and aggregation of macromolecules\, the turnover rate of enzymes\, the pickling of cucumbers\, and even the transf er of charge between ice particles in a lightning storm. Using a combinatio n of spectroscopic techniques\, thermodynamic measurements as well as simul ations\, it is now possible to elucidate key molecular level details of Hof meister series behavior. In this presentation\, the solubility of thermores ponsive polymers in the presence of salts will be discussed. The results sh ow that weakly hydrated anions bind along polymer chains in locations where the hydrogen bonding is most greatly disrupted. Curiously\, this makes sho rter oligomers less soluble compared to longer polymers possessing the same chemical constituents in NaSCN\, NaI\, or NaClO4 solutions. Moreover\, wea kly hydrated anions interact more strongly than cations with uncharged poly mer chains. In fact\, metal cations rarely come to the polymer/water interf ace without being accompanied by counter anions.\n\n\n\n \n\n\n\nWeakly hyd rated anions bind to polymers but not monomers in aqueous solutions\nBradle y A. Rogers\, Halil I. Okur\, Chuanyu Yan\, Tinglu Yang\, Jan Heyda\, Paul S. Cremer\nNat. Chem. 14 (2022)\, 40-45 The Molecular Mechanism for the Int eractions of Hofmeister Cations with Macromolecules in Aqueous Solution\nEl len E. Bruce\, Halil I. Okur\, Sina Stegmaier\, Chad I. Drexler\, Bradley A . Rogers\, Nico F. A. van der Vegt\, Sylvie Roke\, Paul S. Cremer\nJ. Am. Chem. Soc.\, 142 (2020) 19094-19100 DTEND:20220418T211000Z DTSTAMP:20240706T013104Z DTSTART:20220418T201000Z GEO:39.322732;-82.10287 LOCATION:Walter Hall\, 245 SEQUENCE:0 SUMMARY:Chemistry & Biochemistry Colloquium | Exploring the Binding of Ions to Polymers in Aqueous Salt Solutions\, April 18 UID:tag:localist.com\,2008:EventInstance_39677583062024 URL:https://calendar.ohio.edu/event/chemistry_biochemistry_colloquium_explo ring_the_binding_of_ions_to_polymers_in_aqueous_salt_solutions_april_18 END:VEVENT END:VCALENDAR