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SUMMARY:Supramolecular Solvent-Free Nanofluids
DTSTART:20150625T110000
DTSTAMP:20260508T015426Z
UID:cedb7b4350308f65b21f8e4fb440e7b305c5d0f294512becfe98de00
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. John Texter of Easter MIchigan University\nBio: Professo
 r Texter has over 35 years’ experience in the fields of coating\, polyme
 rs\, colloids\, emulsions\, and advanced materials. He has over 200 public
 ations including over 44 issued US Patents. He has been Editor-in-Chief of
  the Journal of Dispersion Science and Technology\, Associate Editor of Na
 noparticle Resesarch\, and has worked for Strider Research Corporation and
  for Eastman Kodak Company in various areas of dispersion and emulsion tec
 hnology.\nHe consults in diverse areas related to dispersion and coating f
 ormulation and stability. He is an experienced lecturer\, organizer\, and 
 technical project manager.\nWe show that auto-condensation of organoalkoxy
 silanes\, followed by suitable anion exchange\, produces solvent-free nano
 particle nanofluids we call organosiloxane supramolecular liquids. We find
  that classical liquid properties are exhibited with some distinct differe
 nces. We observe heat capacity anomalies manifested as lambda transitions 
 in excess heat capacity centered around a glass transition (Tg) and around
  a freezing transition. The Tg-proximal lambda transition is the first exp
 erimental realization of an enthalpic phase transition overlying a glass t
 ransition. The existence of such a connection or coincidence has undergone
  decades of theoretical conjecture.\nThe second anomaly spanning the melti
 ng/freezing range is the first reported excess enthalpy ever reported for 
 an experimental particulate fluid undergoing a phase transition. The integ
 ral enthalpy from these lambda transitions is quantitatively accounted for
  by the loss of specific surface area of the particles\, and the associate
 d surface free energy\, upon freezing and upon cooling beneath the glass t
 ransition temperature. This system also is the first experimental particle
  system reported that exhibits multiphase coexistence that otherwise is fr
 ustrated from crystallizing due to polydispersity.\nThis new material and 
 cousins to be similarly derived promise to become useful in developing sof
 t-sphere potentials in the thermodynamics of polymeric liquids. Similarly 
 composed nanofluids obtained by condensation on nanosilica core templates 
 and surface decorated with both ionic liquid organic salt groups and with 
 various reactive groups are exotic cross-linking agents that define new ty
 pes of resins. Such agents can be used to counter embrittlement provided b
 y nanofillers while increasing toughness. We show that such materials can 
 be used to produce thin films including UV protective clearcoats and an in
 teresting new family of adhesives.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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