BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Design of Highly Porous Ceramics from Preceramic Polymers
DTSTART:20150330T171500
DTSTAMP:20260916T230025Z
UID:39ee3fb7786f3980d7cfa96222b7d98532b36a643ed648347ee511e6
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Paolo Colombo\, University of Padova\, Italy\nPorous cer
 amics\, and cellular ceramics in particular\, possess an unique combinatio
 n of favorable properties\, such as low density\, low thermal conductivity
 \, low dielectric constant\, high thermal shock resistance\, high specific
  strength and high chemical resistance\, which make them good candidates f
 or both structural or functional applications in a variety of aggressive e
 nvironments. In particular\, highly porous ceramics find numerous applicat
 ions in the field of energy as porous electrodes for SOFCs\, membranes for
  hydrogen purification\, components for CO2 sequestration\, lightweight su
 pport structures\, parts for high temperature thermal management\, filters
  for the purification of various gases\, components for thermal energy sto
 rage\, catalyst support\, battery components\, etc.\nThere is a definite n
 eed to develop processing approaches capable of delivering cellular cerami
 cs with varied characteristics\, in terms of properties and architecture. 
 This talk will discuss the use of preceramic polymers to fabricate highly 
 porous ceramics with a wide variety of pore morphology and sizes\, ranging
  from the micro-meso to the macro scales\, using a variety of processing a
 pproaches. These include direct foaming\, the use of sacrificial fillers\,
  and the mixing of preceramic polymers of different characteristics. Furth
 ermore\, by using fabrication methods such as electro-spraying\, micro- fl
 uidics and emulsification\, hollow microbeads particles and porous capsule
 s were produced. Electrospinning of preceramic polymers enabled the fabric
 ation of open-interconnected–network structures based on SiOC nano-fiber
  mats\, while automated manufacturing techniques (direct and indirect 3D p
 rinting) were used for the reliable fabrication of highly porous ceramic p
 arts with complex geometries and different compositions.\nBodies with a hi
 erarchical porosity (e.g. micro-macro) or with graded porosity were also b
 e obtained. The amount of porosity can be as high as >90 vol%\, with pore 
 size in the range from nm to mm\, and thus most properties can be varied\,
  rather continuously\, in a wide range of values. Chlorination of polymer-
 derived-ceramics (PDCs) led to carbon-based materials with high specific s
 urface area values\, high pore volume and outstanding gas storage properti
 es. Moreover\, the direct growth of 1D nanostructures (e.g. nano-wires\, n
 ano-belts) on the cell wall surfaces of cellular bodies (including commerc
 ially available ceramic foams or honeycombs) enabled the production of com
 ponents possessing a hierarchical pore structure\, of interest for differe
 nt applications (particle filtration\, catalysis or catalyst support).\nFi
 nally\, the introduction of filler powders allowed for the synthesis of fu
 nctional cellular ceramics\, possessing for instance electrical conductivi
 ty or magnetic properties in addition to a controlled porous architecture.
LOCATION:CM 1 4 https://plan.epfl.ch/?room==CM%201%204
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR