Nanocelluloses in Multi-phase Systems
Event details
| Date | 25.04.2016 |
| Hour | 13:15 › 14:15 |
| Speaker | Dr. Orlando J. Rojas, Aalto University Finland |
| Location | |
| Category | Conferences - Seminars |
We 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 structure encompassing a wide range of sizes, from the nano to the meter scales. A number of materials cleaved from the cell wall have been the subject of intensive research, including, nanofibrillar cellulose and cellulose nanocrystals (CNCs), i.e., defect-free, rod-like crystalline residues after acid hydrolysis of cellulose fibers. Interest in nanocellulose originates from its appealing intrinsic properties: nanoscale dimensions, high surface area, unique morphology, low density, chirality and mechanical strength. Directing their assembly back to different hierarchical 1D, 2D and 3D structures is a quest that can yield useful results in many revolutionary applications. As such, we will discuss the use of non-specific forces to create ultrathin films of nanocellulose at the air-solid interface 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 employed to control the packing density of CNC at the air-liquid and air-solid interfaces will be presented. A convective assembly setup assisted by shear and electric fields will be discussed as a suitable method to produce highly ordered structures. Concepts related to piezoelectric CNC films, organic-inorganic hybrid materials with magnetic and other properties. Overall, the prospects of such novel materials will be explained in light of the unique properties of cellulose.
REFERENCES:
Find here full Publication List
Some relevant publications:
Salas, C.; Nypelö, T.; Rodriguez-Abreu, C.; Carrillo, C.; Rojas, O.J. Nanocellulose Properties and Applications in Colloids and Interfaces, Current Opinion in Colloid & Interface Science, 19, 383–396 (2014). DOI: 10.1016/j.cocis.2014.10.003
Nypelö, T.; Rodriguez-Abreu, C.; Kolen’ko, Y.V; Rivas, J.; Rojas, O.J. Microbeads and Hollow Microcapsules Obtained by Self-Assembly of Pickering Magneto-Responsive Cellulose Nanocrystals, ACS Applied Materials & Interfaces, 6, 16851–16858 (2014) DOI: 10.1021/am504260u
Csoka, 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
Arcot, L.R.; Lundahl, 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
Izawa H, Okuda O, Ifuku S, Morimoto M, Saimoto H, Rojas OJ, Bio-based wrinkled surfaces harnessed from biological design principles of wood and peroxidase activity, ChemSusChem, 8, 3892–3896 (2015). DOI: 10.1002/cssc.201500819
Bio: Dr. Rojas is Professor of Bio-based Materials in Aalto University (Finland). Previously, he was Professor in the departments of Chemical and Biomolecular Engineering and Forest Biomaterials of North Carolina State University (USA). Earlier in his career he was a senior scientist appointed by the Royal Swedish Academy of Sciences in the Royal Institute of Technology (KTH), a postdoctoral fellow in the Institute for Surface Chemistry, Sweden and research assistant in Auburn University. He was appointed as Finland Distinguish Professor (2009-2014) and was Chair of the “Division of Cellulose and Renewable Materials” of the American Chemical Society (2009-2011). He was elected with the distinction of Fellow of the American Chemical Society (2013) for his scientific and professional contributions. He is the recipient of the 2015 Nanotechnology Division Technical Award and IMERYS Prize for outstanding contributions that have advanced the industry's technology. He was appointed as a “2013-2017 Faculty Scholar” of NCSU and ACS Division Award of “Cellulose and Renewable Materials”. His work is centered on the utilization of lignocellulosic materials in novel, high performance applications and the interfacial and the adsorption behaviors of surfactants and biopolymers at solid/liquid interfaces. He has published over 220 peer-reviewed papers related to these topics. He and his students have given +280 conference presentations and has been invited numerous times (+190) as a speaker in conferences, universities and research centers worldwide. The recent efforts of his group, “Bio-based Colloids 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 systems.
REFERENCES:
Find here full Publication List
Some relevant publications:
Salas, C.; Nypelö, T.; Rodriguez-Abreu, C.; Carrillo, C.; Rojas, O.J. Nanocellulose Properties and Applications in Colloids and Interfaces, Current Opinion in Colloid & Interface Science, 19, 383–396 (2014). DOI: 10.1016/j.cocis.2014.10.003
Nypelö, T.; Rodriguez-Abreu, C.; Kolen’ko, Y.V; Rivas, J.; Rojas, O.J. Microbeads and Hollow Microcapsules Obtained by Self-Assembly of Pickering Magneto-Responsive Cellulose Nanocrystals, ACS Applied Materials & Interfaces, 6, 16851–16858 (2014) DOI: 10.1021/am504260u
Csoka, 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
Arcot, L.R.; Lundahl, 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
Izawa H, Okuda O, Ifuku S, Morimoto M, Saimoto H, Rojas OJ, Bio-based wrinkled surfaces harnessed from biological design principles of wood and peroxidase activity, ChemSusChem, 8, 3892–3896 (2015). DOI: 10.1002/cssc.201500819
Bio: Dr. Rojas is Professor of Bio-based Materials in Aalto University (Finland). Previously, he was Professor in the departments of Chemical and Biomolecular Engineering and Forest Biomaterials of North Carolina State University (USA). Earlier in his career he was a senior scientist appointed by the Royal Swedish Academy of Sciences in the Royal Institute of Technology (KTH), a postdoctoral fellow in the Institute for Surface Chemistry, Sweden and research assistant in Auburn University. He was appointed as Finland Distinguish Professor (2009-2014) and was Chair of the “Division of Cellulose and Renewable Materials” of the American Chemical Society (2009-2011). He was elected with the distinction of Fellow of the American Chemical Society (2013) for his scientific and professional contributions. He is the recipient of the 2015 Nanotechnology Division Technical Award and IMERYS Prize for outstanding contributions that have advanced the industry's technology. He was appointed as a “2013-2017 Faculty Scholar” of NCSU and ACS Division Award of “Cellulose and Renewable Materials”. His work is centered on the utilization of lignocellulosic materials in novel, high performance applications and the interfacial and the adsorption behaviors of surfactants and biopolymers at solid/liquid interfaces. He has published over 220 peer-reviewed papers related to these topics. He and his students have given +280 conference presentations and has been invited numerous times (+190) as a speaker in conferences, universities and research centers worldwide. The recent efforts of his group, “Bio-based Colloids 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 systems.
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Practical information
- General public
- Free
Organizer
- Prof. Michele Ceriotti
Contact
- Prof. Michele Ceriotti