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DTSTAMP:20260426T212704Z
UID:1699264800@ist.ac.at
DTSTART:20231106T110000
DTEND:20231106T120000
DESCRIPTION:Speaker: John Hoffman\nhosted by Scott Waitukaitis\nAbstract: T
 he tailored design of modified nanofiltration membranes requires rapid fun
 ctionalization processes to introduce key functionalities that help overco
 me the permeability / selectivity tradeoff seen in size-selective membrane
 s. Many techniques have demonstrated the positive impact of introducing ad
 ditional interactions between membranes and solutes\, such as charged moie
 ties\, which can increase the rejection of salt ions. Beyond singularly fu
 nctionalized membranes\, novel transport properties emerge when multiple f
 unctionalities are integrated within a membrane system. This can be due to
  domains interacting with each other at their interfacial junctions\, as w
 ell as when isolated domains work independently but in a coordinated manne
 r during operating conditions. Utilizing a post-fabrication functionalizat
 ion method\, the desired membrane structure is first formed by tailoring t
 he polymer chemistry and casting conditions and the addition of a desired 
 functionality is achieved through coupling reactions with reactive solutio
 ns and functionally lined pore walls.In this work\, the ability to isolate
  functional domains utilizes a copper-catalyzed azide-alkyne cycloaddition
  (CuAAC) reaction process which was confirmed through Fourier-transform in
 frared spectroscopy analysis. Here we developed protocols for synthesizing
  reactive solutions that achieved high reactive rates compared to the diff
 usive rate of the solution as it transports through the membrane. Multi-fu
 nctional membranes with surface anti-fouling chemistry and underlying char
 ged chemistry were made which exhibited equivalent ion rejection performan
 ce compared to fully charged membranes\, but with a much lower propensity 
 for fouling. The CuAAC reaction was also used to form surface patterned mu
 lti-functional membranes\, in which asymmetric coverage of positive and ne
 gative charge resulted in unique transport phenomena of asymmetric salts\,
  such as magnesium chloride (MgCl2) and potassium sulfate (K2SO4)\, which 
 resulted in enrichment in ions in the permeate. This type of controlled io
 n transport is not possible in singularly functionalized materials\, there
 by demonstrating the unique transport properties that multi-functional mem
 branes can achieve.
LOCATION:Moonstone Bldg / Ground floor / Seminar Room F\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:John Hoffman: Designing Polymeric Nanofiltration Membranes that Exh
 ibit Multi-faceted Properties
URL:https://talks-calendar.ista.ac.at/events/4575
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