A5004912971- Advanced Cellulose Research Studies
- Polysaccharides and Plant Cell Walls
- Nanocomposite Films for Food Packaging
- Lignin and Wood Chemistry
- biodegradable polymer synthesis and properties
- Electrospun Nanofibers in Biomedical Applications
- Pickering emulsions and particle stabilization
- Inhalation and Respiratory Drug Delivery
- Aerogels and thermal insulation
- Advanced Materials and Mechanics
- Material Properties and Processing
- Microencapsulation and Drying Processes
- Hydrogels: synthesis, properties, applications
- Protein purification and stability
- Advanced Sensor and Energy Harvesting Materials
- Infection Control and Ventilation
- Polymer Surface Interaction Studies
- Force Microscopy Techniques and Applications
- Polysaccharides Composition and Applications
- Liquid Crystal Research Advancements
- Surface Modification and Superhydrophobicity
- Dyeing and Modifying Textile Fibers
- Advanced Polymer Synthesis and Characterization
- Enzyme-mediated dye degradation
- Immunotherapy and Immune Responses
University of British Columbia
2019-2025
McMaster University
2015-2024
National Collaborating Centre for Methods and Tools
2022
National Centre for Research Methods
2022
Vancouver Biotech (Canada)
2020-2021
McGill University
2003-2015
KTH Royal Institute of Technology
2010-2013
Biotechnology Research Institute
2003
Naturally derived cellulose nanocrystals (CNCs) and nanofibrils (CNFs) are emerging nanomaterials that display high strength, surface area, tunable chemistry, allowing for controlled interactions with polymers, nanoparticles, small molecules, biological materials. Industrial production of nanocelluloses is increasing rapidly several companies already producing on the tons-per-day scale, intensifying quest viable products across many sectors. While hydrophilicity nanocellulose interface has...
The surface of cellulose nanocrystals, prepared by sulfuric acid hydrolysis cotton, was rendered cationic through a reaction with epoxypropyltrimethylammonium chloride. resultant nanocrystal suspensions were characterized ζ-potential, conductometric titration and polarized light microscopy. Atomic force microscopy (AFM) showed no change in the size or shape but functionalization process reversed charge led to reduction total density. These modifications stable aqueous nanocrystalline...
Cellulose nanocrystals (CNCs) are entering the marketplace as new high-strength nanoadditives from renewable resources. These high aspect ratio particles have potential applications rheological modifiers, reinforcing agents in composites, coatings, and porous materials. In this work, chemically cross-linked CNC aerogels were prepared based on hydrazone cross-linking of hydrazide aldehyde-functionalized CNCs. The resulting ultralightweight (5.6 mg/cm3) highly (99.6%) with a bimodal pore...
The renewability, biocompatibility, and mechanical properties of cellulose nanocrystals (CNCs) have made them an attractive material for numerous composite, biomedical, rheological applications. However, CNCs to shift from a laboratory curiosity commercial applications, researchers must transition extracted on the bench scale produced industrial scale. There are number companies currently producing kilogram ton per day quantities sulfuric acid-hydrolyzed as well other nanocelluloses,...
Flexible and porous aerogels are obtained by combining functional metal–organic frameworks (MOFs) structural cellulose nanocrystals via a straightforward water-based sol–gel process, followed freeze-drying. The have hierarchical structure with controllable MOF loading up to 50 wt%. These hybrid materials can be used as absorbents for water purification. As service our authors readers, this journal provides supporting information supplied the authors. Such peer reviewed may re-organized...
Aqueous layer-by-layer (LbL) processing was used to create polyelectrolyte multilayer (PEM) nanocomposites containing cellulose nanocrystals and poly(allylamine hydrochloride). Solution-dipping spin-coating assembly methods gave smooth, stable, thin films. Morphology studied by atomic force microscopy (AFM) scanning electron (SEM), film growth characterized X-ray photoelectron spectroscopy (XPS), ellipsometry, optical reflectometry. Relatively few deposition cycles were needed give full...
Chemically cross-linked cellulose nanocrystal aerogels represent a versatile and universal substrate on which to prepare lightweight hybrid materials. In situ incorporation of polypyrrole nanofibers, polypyrrole-coated carbon nanotubes, manganese dioxide nanoparticles in the gives flexible 3D supercapacitor devices with excellent capacitance retention, low internal resistance, fast charge-discharge rates.
Injectable hydrogels based on carboxymethyl cellulose and dextran, reinforced with rigid rod-like nanocrystals (CNCs) aldehyde-functionalized CNCs (CHO–CNCs), were prepared characterized. The mechanical properties, internal morphology, swelling of injectable unmodified modified at various loadings examined. In all cases, gelation occurred within seconds as the hydrogel components extruded from a double-barrel syringe, evenly distributed throughout composite, observed by scanning transmission...
Fabrication of anisotropic hydrogels exhibiting direction-dependent structure and properties has attracted great interest in biomimicking, tissue engineering, bioseparation. Herein, we report a freeze-casting-based fabrication structurally mechanically aerogels composed hydrazone cross-linked poly(oligoethylene glycol methacrylate) (POEGMA) cellulose nanocrystals (CNCs). We show that, by controlling the composition CNC/POEGMA dispersion freeze-casting temperature, with fibrillar, columnar,...
An environmentally friendly procedure for the surface modification of cellulose nanocrystals (CNCs) in water is presented. Tannic acid (TA), a plant polyphenol, acts as primer when mixed with CNCs suspension, which are then reacted decylamine (DA), hydrophobe. Schiff base formation/Michael-type addition covalently attaches primary amines long alkyl tails to CNC-TA, increasing particle hydrophobicity (contact angle shift from 21 74°). After modification, CNC-TA-DA particles phase separate,...
While injectable hydrogels have several advantages in the context of biomedical use, their generally weak mechanical properties often limit applications. Herein, we describe situ-gelling nanocomposite based on poly(oligoethylene glycol methacrylate) (POEGMA) and rigid rod-like cellulose nanocrystals (CNCs) that can overcome this challenge. By physically incorporating CNCs into hydrazone cross-linked POEGMA hydrogels, macroscopic including gelation rate, swelling kinetics, properties,...
We report on the latest scientific advances related to use of porous foams and gels prepared with cellulose nanofibrils (CNF) nanocrystals (CNC) as well bacterial nanocellulose (BNC) – collectively nanocelluloses biomedical materials for application in tissue regeneration. Interest such applications stems from lightweight strong structures that can be efficiently produced these nanocelluloses. Dried gels, including xerogels, cryogels, aerogels have been synthesized effortlessly using green,...
Abstract This review paper provides a recent overview of current international research that is being conducted into the functional properties cellulose as nanomaterial. A particular emphasis placed on fundamental and applied undertaken to generate applications, which are now becoming real prospect given developments in field over last 20 years. short introduction covers context work, definitions different forms nanomaterials (CNMs) most widely studied. We also address terminology used for...
Cellulose nanocrystals (CNCs) are a sustainable nanomaterial with applications spanning composites, coatings, gels, and foams. Surface modification routes to optimize CNC interfacial compatibility functionality required exploit the full potential of this material in design new products. In work, CNCs have been rendered pH-responsive by surface-initiated graft polymerization 4-vinylpyridine initiator ceric(IV) ammonium nitrate. The is one-pot, water-based synthesis carried out under...
The effect of water-soluble polymers on the properties Pickering emulsions stabilized by cellulose nanocrystals (CNCs) was investigated. Pretreatment CNCs with excess adsorbing polymer, hydroxyethyl (HEC) or methyl (MC), gave smaller and more stable dodecane-in-water emulsion droplets compared to either polymer alone, i.e., synergistic stabilization. By contrast, dextran, which does not adsorb CNCs, unstable emulsions, without CNCs. HEC MC produced that showed no significant creaming phase...
The effect of tannic acid (TA) and water-soluble cellulose derivatives on the properties Pickering emulsions stabilized by nanocrystals (CNCs) was investigated. potential to both fully dry CNC-stabilized redisperse dried in water is demonstrated. When CNCs are mixed with excess adsorbing polymer, either methyl or hydroxyethyl cellulose, followed emulsification corn oil, oil-in-water can be transformed without oil leakage into solid via freeze-drying. However, these exhibit droplet...