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UID:20251119T161715EST-2631kAhDA8@132.216.98.100
DTSTAMP:20251119T211715Z
DESCRIPTION:Abstract:\n\nThe building blocks of cellulose microfibrils\, wh
 ich make up the wall of wood fibers\, are cellulose nanofibrils (CNF). The
 se fibrils are several microns long and have a diameter of about 5 nm. The
 y consist of alternating crystalline and amorphous regions\, each about 10
 0-200 nm in length. Removing the amorphous regions by acid hydrolysis lead
 s to the formation of cellulose nanocrystals (CNC)\, each about 100-200 nm
  long and 5 nm wide\, which are well studied and presently available comme
 rcially. We can also cleave the chains in the amorphous regions\, resultin
 g in cellulose nanoparticles with a crystalline core\, with amorphous cell
 ulose chains protruding from both ends. We refer to these particles as hai
 ry nanocellulose (HNC). The hairs (i.e. the protruding chains) can be read
 ily functionalized by reactive aldehyde groups\, carboxyl groups\, quatern
 ary amine groups\, and as a result the properties of HNC can be precisely 
 tuned. We will discuss the synthesis of these particles\, their characteri
 zation and rheological properties\, and point to a number of potential app
 lications\, such as heavy metal scavenging\, antiscaling agents\, antifoul
 ing membranes\, crystal morphology modifiers\, components of wound dressin
 gs and when incorporated in carbon nanotube matrices\, they act as a humid
 ity switch. When charged\, they can be readily dried and redispersed\, in 
 contrast with CNC\, which is difficult to redisperse when dried.\n\nBio:\n
 \nTheo van de Ven received a Masters Degree in Physical and Colloid Chemis
 try\, with a minor in Theoretical Physics\, from Utrecht University in the
  Netherlands and a PhD in Physical Chemistry from ɬÀï·¬. After
  a two-year postdoc at Sydney University in Australia\, he returned to Mon
 treal\, where he became an assistant scientist at Paprican\, working in th
 e Pulp & Paper Centre\, ɬÀï·¬. In 1981 he obtained a cross-appointment wi
 th the Department of Chemistry\, where he became a full professor in 2004.
  He has published 350 papers in scientific journals\, 64 refereed conferen
 ce proceedings\, 7 book chapters\, 1 book\, edited 4 books and holds 4 pat
 ents. His research interests are in the areas of colloidal hydrodynamics\,
  papermaking and cellulose chemistry. He is a Fellow of the Royal Society 
 of Canada\, was awarded the ACS Award in Colloid and Surface Science\, and
  received the Kalev Pugi Award from the Canadian Section of the Society of
  Chemical Industry. He is this year’s holder of ɬÀ﷬’s Fessenden Profess
 orship.\n
DTSTART:20181113T180000Z
DTEND:20181113T193000Z
LOCATION:Room 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\
 , 801 rue Sherbrooke Ouest
SUMMARY:Chemical Society Seminar: Prof. Theo van de Ven - Nanocellulose
URL:/chemistry/channels/event/chemical-society-seminar
 -prof-theo-van-de-ven-nanocellulose-291407
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