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SUMMARY:Nanocelluloses in Multi-phase Systems
DTSTART:20160425T131500
DTEND:20160425T141500
DTSTAMP:20260406T192601Z
UID:94d43e309797cdacbdf3fd9f7f7adc880d26f923a72872e9d2ca205d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Orlando J. Rojas\, Aalto University Finland\nWe introduce 
 our work related to the application of surface and colloid science in the 
 development of lignocellulose nanomaterials. These efforts take advantage 
 of the process by which nature assembles fibers in a highly hierarchical s
 tructure encompassing a wide range of sizes\, from the nano to the meter s
 cales. A number of materials cleaved from the cell wall have been the subj
 ect of intensive research\, including\, nanofibrillar cellulose and cellul
 ose nanocrystals (CNCs)\, i.e.\, defect-free\, rod-like crystalline residu
 es after acid hydrolysis of cellulose fibers. Interest in nanocellulose or
 iginates from its appealing intrinsic properties: nanoscale dimensions\, h
 igh surface area\, unique morphology\, low density\, chirality and mechani
 cal strength. Directing their assembly back to different hierarchical 1D\,
  2D and 3D structures is a quest that can yield useful results in many rev
 olutionary applications. As such\, we will discuss the use of non-specific
  forces to create ultrathin films of nanocellulose at the air-solid interf
 ace for applications in nanocoatings\, sensors\, etc. Assemblies at other 
 interfaces will be introduced as means to produce or stabilize hydrogels\,
  aerogels\, and Pickering emulsions. Methods common in biophysics and empl
 oyed to control the packing density of CNC at the air-liquid and air-solid
  interfaces will be presented. A convective assembly setup assisted by she
 ar and electric fields will be discussed as a suitable method to produce h
 ighly ordered structures. Concepts related to piezoelectric CNC films\, or
 ganic-inorganic hybrid materials with magnetic and other properties. Overa
 ll\, the prospects of such novel materials will be explained in light of t
 he unique properties of cellulose.\nREFERENCES:\nFind here full Publicatio
 n List\nSome relevant publications:\nSalas\, C.\; Nypelö\, T.\; Rodriguez
 -Abreu\, C.\; Carrillo\, C.\; Rojas\, O.J. Nanocellulose Properties and Ap
 plications in Colloids and Interfaces\, Current Opinion in Colloid & Inter
 face Science\, 19\, 383–396 (2014). DOI: 10.1016/j.cocis.2014.10.003\nNy
 pelö\, T.\;  Rodriguez-Abreu\, C.\; Kolen’ko\, Y.V\; Rivas\, J.\; Roja
 s\, O.J. Microbeads and Hollow Microcapsules Obtained by Self-Assembly of 
 Pickering Magneto-Responsive Cellulose Nanocrystals\, ACS Applied Material
 s & Interfaces\, 6\, 16851–16858 (2014) DOI: 10.1021/am504260u\nCsoka\, 
 L.\, Hoeger\, I.\, Rojas\, O.J.\, Peszlen\, I.\, Pawlak\, J.\, Peralta\, P
 .\, Piezoelectric Effect of Cellulose Nanocrystals Thin Films\, ACS Macro 
 Letters\, 1\, 867–870 (2012) DOI: 10.1021/mz300234a\nArcot\, L.R.\; Lund
 ahl\, M.\; Rojas\, O.J.\; Laine\, J.\, Asymmetric cellulose nanocrystals: 
 thiolation of reducing end groups via NHS–EDC coupling\, Cellulose\, 21\
 , 4209–4218 (2014). DOI: 10.1007/s10570-014-0426-9\nIzawa H\, Okuda O\, 
 Ifuku S\, Morimoto M\, Saimoto H\, Rojas OJ\, Bio-based wrinkled surfaces 
 harnessed from biological design  principles of wood and peroxidase activ
 ity\, ChemSusChem\, 8\, 3892–3896 (2015). DOI: 10.1002/cssc.201500819\nB
 io: Dr. Rojas is Professor of Bio-based Materials in Aalto University (Fin
 land). Previously\, he was Professor in the departments of Chemical and Bi
 omolecular Engineering and Forest Biomaterials of North Carolina State Uni
 versity (USA). Earlier in his career he was a senior scientist appointed b
 y the Royal Swedish Academy of Sciences in the Royal Institute of Technolo
 gy (KTH)\, a postdoctoral fellow in the Institute for Surface Chemistry\, 
 Sweden and research assistant in Auburn University. He was appointed as Fi
 nland Distinguish Professor (2009-2014) and was Chair of the “Division o
 f Cellulose and Renewable Materials” of the American Chemical Society (2
 009-2011). He was elected with the distinction of Fellow of the American C
 hemical Society (2013) for his scientific and professional contributions. 
 He is the recipient of the 2015 Nanotechnology Division Technical Award an
 d IMERYS Prize for outstanding contributions that have advanced the indust
 ry's technology. He was appointed as a “2013-2017 Faculty Scholar” of 
 NCSU and ACS Division Award of “Cellulose and Renewable Materials”. Hi
 s work is centered on the utilization of lignocellulosic materials in nove
 l\, high performance applications and the interfacial and the adsorption b
 ehaviors of surfactants and biopolymers at solid/liquid interfaces.  He h
 as published over 220 peer-reviewed papers related to these topics. He and
  his students have given +280 conference presentations and has been invite
 d numerous times (+190) as a speaker in conferences\, universities and res
 earch centers worldwide. The recent efforts of his group\, “Bio-based Co
 lloids and Materials”\, deal with the development of nanostructures from
  the fiber cell wall and cellulose derivatives\, the dynamics of enzymatic
  reactions and the design of stimuli-responsive materials and multiphase s
 ystems.
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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