Biobased Colloids and Materials, Renewable Nanomaterials, Bioproducts
Canada Excellence Research Chair in Bioproducts
Scientific Director, Bioproducts Institute
Director, Pulp and Paper Center
CHBE 259
Royal Institute of Technology (KTH), Sweden, 2003, Postdoctoral Associate
Auburn University, USA, 1998, Ph.D., Chemical Engineering
Universidad de Los Andes, Venezuela, 1993, M.Sc, Chemical Engineering
Universitat Politecnica Catalunya (UPC), Spain, 1986, M.Sc, Paper Engineering
Universidad de Los Andes (ULA), Venezuela, 1985, B.Sc., Chemical Engineering
Research Interests

Prof. Orlando Rojas works toward supporting global sustainable development through research on the fundamental and utilization aspects of renewable resources, including lignocellulose, proteins and other biopolymers. His research aims to discover competitive alternatives for fossil materials. Specific research interests include:

·            Nanopolysaccharides (based on cellulose, chitin, starches and others)

·            Bacterial nanocelluloses

·            Cellulose derivatives

·            Lignins, colloidal lignins, nanolignins and their uses

·            Renewable biopolymers (hemicelluloses, proteins, chitin and chitosan, alginates and others)

·            Multiphase systems (emulsions, foams, dispersed systems), gels, aerogels

·            Films, filaments and hybrid materials

·            Nanocomposites

·            Bioactive systems

·            Fiber processing

·            Pulp and paper


Select Publications



Tardy B.L., Richardson J.J., Greca L.G., Guo J., Ejima H., Rojas O.J., Exploiting supramolecular interactions from polymeric colloids for strong anisotropic adhesion between solid surfaces, Advanced Materials, 1906886 (2020). DOI: 10.1002/adma.201906886 

Ajdary R., Tardy B.L., Mattos B.D., Bai L., Rojas O.J., Plant Nanomaterials and Inspiration from Nature: Water Interactions and Hierarchically-Structured Hydrogels, Advanced Materials, Accepted (2020). DOI:

Ferreira F.V., Otoni C.G., De France K.J., Barud H.S. Lona L.M.F, Cranston E., Rojas O.J., Porous nanocellulose gels and foams: breakthrough status in the development of scaffolds for tissue engineering, Materials Today, Accepted (2020). DOI: 10.1016/j.mattod.2020.03.003

Mattos B.D., Tardy B.L., Greca L.G., Kämäräinen T., Xiang W., Cusola O., Magalhães W.L.E., Rojas O.J., Nanofibrillar networks enable universal assembly of superstructured particle constructs, Science Advances, 6, eaaz7328 (2020). DOI: 10.1126/sciadv.aaz7328

Ajdary R., Ezazi N.Z., Correia A., Kemell M., Huan S., Ruskoaho H.J., Hirvonen J., Santos H.A., Rojas O.J., Multifunctional 3D-printed patches for long-term drug release therapies after myocardial infarction, Advanced Functional Materials, Accepted (2020). DOI:

Bai L., Kämäräinen T., Xiang W., Majoinen J., Seitsonen J., Grande R.,  Huan S., Liu L., Fan Y., Rojas O.J., Chirality from Cryo-Electron Tomograms of Nanocrystals Obtained by Lateral Disassembly and Surface Etching of Never-Dried Chitin, ACS Nano, Accepted (2020). DOI: 10.1021/acsnano.0c01327

Ezazi N.Z., Ajdary R., Correia A., Mäkilä E., Salonen J., Kemell M., Hirvonen J., Rojas O.J., Ruskoaho H.J., Santos H.A., Fabrication and characterization of drug-loaded conductive poly(glycerol sebacate)/nanoparticle based composite patch for myocardial infarction applications, ACS Applied Materials & Interfaces, 12, 6899-6909 (2020). DOI: 10.1021/acsami.9b21066

Zhu Y., Huan S., Bai L., Ketola A., Shi X., Zhang X., Ketoja J.A., Rojas O.J, High Internal Phase Oil-in-Water Pickering Emulsions Stabilized by Chitin Nanofibrils: 3D Structuring and Solid Foam, ACS Applied Materials & Interfaces, 12, 11240-11251 (2020). DOI: 10.1021/acsami.9b23430

Österberg M., Sipponen M.H., Mattos B.D., Rojas O.J., Spherical lignin particles: A review on their sustainability and applications, Green Chemistry, 22, 2712-2733 (2020). DOI: 10.1039/D0GC00096E

Wang L., Borghei M., Ishaq A., Lahtinen P., Ago M., Papageorgiou A.; Lundahl M., Johansson L.-S., Kallio T., Rojas O.J., Mesoporous carbon microfibers for electroactive materials derived from lignocellulose nanofibrils, ACS Sustainable Chemistry & Engineering, Accepted (2020). DOI: 10.1021/acssuschemeng.0c00764

Grande R., Bai L., Wang L., Xiang W., Ikkala O., Carvalho A.F.K., Rojas O.J., Nanochitins of varying aspect ratio and properties of microfibers produced by interfacial complexation with seaweed alginate, ACS Sustainable Chemistry & Engineering, 8, 1137-1145 (2020). DOI: 10.1021/acssuschemeng.9b06099

Lourençon T.V., Greca L.G., Tarasov D., Borrega M., Tamminen T., Rojas O.J., Balakshin M.Y., Lignin-first integrated hydrothermal treatment (HTT) and synthesis of low-cost biorefinery particles, ACS Sustainable Chemistry & Engineering, 8, 1230-1239 (2020). DOI: 10.1021/acssuschemeng.9b06511

Gonzalez-Vogel A., Rojas O.J., Exploiting electroconvective vortices in electrodialysis with high-frequency asymmetric bipolar pulses for desalination in overlimiting current regimes, Desalination, 474, 114190 (2020). DOI: 10.1016/j.desal.2019.114190

Zhou H., Tan Y., Lv S., Liu J., Muriel Mundo J.L., Bai L., Rojas O.J., McClements D.J., Nanochitin-Stabilized Pickering Emulsions: Influence of Nanochitin on Lipid Digestibility and Vitamin Bioaccessibility, Food Hydrocolloids, 106, 105878 (2020). DOI: 10.1016/j.foodhyd.2020.105878

Reyes-Torres G., Lundahl M.J., Alejandro-Martín S., Arteaga-Pérez, L.E., Oviedo C., King A.W.T., Rojas O.J., Coaxial spinning of all-cellulose systems for enhanced toughness: filaments of oxidized nanofibrils sheathed in cellulose II regenerated from a protic ionic liquid, Biomacromolecules, 21, 878-891 (2020). DOI: 10.1021/acs.biomac.9b01559

Chu, G., Vasilyev, G., Qu, D., Deng, S., Long B., Rojas O.J., Zussman E., Structural Arrest and Phase Transition in Glassy Nanocellulose Colloids, Langmuir, 36, 979-985 (2020). DOI: 10.1021/acs.langmuir.9b03570

Ketola A.E. Xiang W., Hjelt T. Pajari H., Tammelin T. Rojas O.J., Ketoja J.A., Bubble attachment to cellulose and silica surfaces of varied surface energies: wetting transition and implications in foam forming, Langmuir, Accepted (2020). DOI:

Zhang X., Morits M., Jonkergouw C., Ora A., Valle-Delgado J.J., Muhammad F., Ajdary R., Huan S., Linder M., Rojas O.J., Sipponen M.H., Österberg M., Three-Dimensional Printed Cell Culture Model Based on Spherical Colloidal Lignin Particles and Cellulose Nanofibril-Alginate Hydrogel, Biomacromolecules, 21, 1875–1885 (2020). DOI:  10.1021/acs.biomac.9b01745

Missio A.L., Mattos B.D., Otoni C.G., Gentil M., Coldebella R., Khakalo A., Gatto D.A., Rojas O.J.  Co-grinding wood fibers and tannins: Surfactant effects on the interactions and properties of functional films for sustainable packaging materials, Biomacromolecules, 21, 1865–1874 (2020). DOI: 10.1021/acs.biomac.9b01733

Zhang Y., Wang X., Wang P., Song J., Jin Y., Rojas O.J. Interactions between type A carbohydrate binding modules and cellulose studied with a quartz crystal microbalance with dissipation monitoring. Cellulose, 27, 3661–3675 (2020). DOI: 10.1007/s10570-020-03070-4

Lehtonen J., Hassinen J., Kumar A.A., Johansson L.-S., Mäenpää R., Pahimanolis N., Pradeep T., Ikkala O., Rojas O.J., Phosphorylated cellulose nanofibers exhibit exceptional capacity for uranium capture, Cellulose, Accepted, (2020). DOI: 10.1007/s10570-020-02971-8 

Haque A.N.M.A., Remadevi R., Rojas O.J., Wang X., Naebe M., Kinetics and equilibrium adsorption of methylene blue onto cotton gin trash bioadsorbents, Cellulose, Accepted (2020). DOI: 10.1007/s10570-020-03238-y

Zhou H., Lv S., Liu J., Tan Y., Muriel Mundo J.L., Bai L., Rojas O.J., McClements D.J., Modulation of Physicochemical Characteristics of Pickering Emulsions: Utilization of Nanocellulose and Nanochitin-coated Lipid Droplet Blends, Journal of Agricultural and Food Chemistry, 68, 603-611 (2020). DOI: 10.1021/acs.jafc.9b06846. 

Otoni C., Queirós M., Sabadini J., Rojas O.J., Loh W., Charge matters: electrostatic complexation as a green approach to assemble advanced functional materials, ACS Omega, 5, 1296-1304 (2020). DOI: 10.1021/acsomega.9b03690

Karakoç A., Rastogi V.K., Isoaho T., Tardy B., Paltakari J., Rojas O.J., Comparative screening of the structural and thermomechanical properties of FDM filaments comprising thermoplastics loaded with cellulose, carbon and glass fibers, Materials 13, 422 (2020). DOI: 10.3390/ma13020422

Johansson1 L.-S., Campbell J.M., Rojas O.J., Cellulose as the in-situ reference for organic XPS. Why? Because it works, Surface and Interface Analysis, Accepted (2020). DOI: 10.1002/sia.6759

Yan J., Yang H., da Silva J.C., Rojas O.J., Loading of iron (II, III) oxide nanoparticles in cryogels based on microfibrillar cellulose for heavy metal ion separation, Advances in Polymer Technology, 9261378 (2020). DOI: 10.1155/2020/9261378

Zambrano F., Starkey H., Wang Y., Abbati de Assis C., Venditti R., Pal L., Jameel H., Hubbe M.A., Rojas O.J., Gonzalez, R., Using micro- and nanofibrillated cellulose as a means to reduce weight of paper products: A review, BioResources, 15, 4553-4590 (2020). DOI:

Molina-Ramírez C., Castro M., Osorio M., Torres-Taborda M., Gómez B., Zuluaga, R., Gómez C., Gañán P., Rojas O.J., Castro C. Effect of Different Carbon Sources on Bacterial Nanocellulose Production and Structure Using the Low pH Resistant Strain Komagataeibacter Medellinensis, Materials, 10, 639 (2020). DOI: 10.3390/ma10060639 



  • Tripathi A., Khan, S.A., Rojas O.J., Parsons G.N., Steach J.K., Witt J.S., Islam B., Goodrich J.D.: WO2017127828 (A1) ― 2017-01-23 Cellulose acetate aerogels
  •  Hall L.J., Deville J.P., Rojas O.J., Carrillo C.A., Salas C.L.: WO2016099537 (A1) ― 2016-06-23 Additive of chemically-modified cellulose nanofibrils or cellulose nanocrystals.
  • Hall L.J., Deville J.P., Rojas O.J., Carrillo C.A., Salas C.L.: WO2016099534 (A1) ― 2016-06-23 Additive of cellulose nanofibrils or nanocrystals and a second polymer.



Scopus ID: 7006924191

Researcher ID O-2890-2014

ORCI ID 0000-0003-4036-4020

Google Scholar



  • 2018 Anselme Payen Award
  • 2018 Recipient of the Act of the Year
  • 2018 EU Commission ERC Advanced grant recipient
  • 2018 FinnCERES Finnish Bioeconomy Flagship
  • 2017 Elected member of the Finnish Academy of Science and Letters
  • 2017 Chair, Materials Platform, Aalto University
  • 2017 Weaver Distinguished Lecturer of Auburn University
  • 2017 Invited Visiting Faculty, Universidad Nacional de Costa Rica
  • 2017 Top ten author during the last 5 years in ACS’ journal Biomacromolecules.
  • 2017 Invited speaker of the Royal Society, “New Horizons for Nanocellulose Technology”
  • 2016 Fibrenamics Award, University on Minho, Portugal
  • 2014 Co-director, Academy of Finland Centre of Excellence Program “Molecular Engineering of Biosynthetic Hybrid Materials Research” (2014-2019), Aalto Univ. 

Professional memberships

American Chemical Society

Canadian Society for Chemical Engineering

Canadian Society for Chemistry

Technical Association of the Pulp and Paper Industry

Professional Affiliations