A5000960991- Carbon Nanotubes in Composites
- Advanced Cellulose Research Studies
- Natural Fiber Reinforced Composites
- Epoxy Resin Curing Processes
- Fiber-reinforced polymer composites
- Advanced Sensor and Energy Harvesting Materials
- Electrospun Nanofibers in Biomedical Applications
- biodegradable polymer synthesis and properties
- Silk-based biomaterials and applications
- Polymer Nanocomposites and Properties
- Rheology and Fluid Dynamics Studies
- Nanopore and Nanochannel Transport Studies
- Force Microscopy Techniques and Applications
- Supercapacitor Materials and Fabrication
- Nanocomposite Films for Food Packaging
- Graphene research and applications
- Tribology and Wear Analysis
- Injection Molding Process and Properties
- Polymer crystallization and properties
- Advanced Materials and Mechanics
- Nanotechnology research and applications
- Mechanical Behavior of Composites
- Wound Healing and Treatments
- Innovations in Concrete and Construction Materials
- Composite Material Mechanics
Cranfield University
2017-2024
Olusegun Agagu University of Science and Technology
2024
Shoolini University
2022
University of Bristol
2011-2017
National Composites Centre
2013-2017
At Bristol
2016
National Institute of Standards and Technology
2006-2010
University of Cambridge
2005-2009
Wright-Patterson Air Force Base
2008
National Institute of Standards
2008
The use of single wall carbon nanotubes (SWCNTs) in current and future applications depends on the ability to process SWCNTs a solvent yield high-quality dispersions characterized by individual possessing minimum SWCNT bundles. Many approaches for dispersion have been reported. However, there is no general assessment which compares relative quality efficiency respective methods. Herein we report quantitative comparison "wrapping polymers" including oligonucleotides, peptides, lignin,...
In this study, we characterize the shear and extensional rheology of dilute to semidilute solutions cellulose in ionic liquid 1-ethyl-3-methylimidazolium acetate (EMIAc). steady flow, exhibit thinning, high-frequency complex modulus measured small amplitude oscillatory flow exhibits characteristic scaling expected for semiflexible chains. Flow curves viscosity plotted against rate closely follow frequency dependence acquired using shear, thus satisfying empirical Cox–Merz rule. We use...
This paper describes rheological measurements and associated optical microstructural observations of multiwall carbon nanotubes (MWCNTs) suspended in an epoxy resin matrix. The base was found to be essentially Newtonian, the progressive incorporation enhanced low shear rate viscosity suspension by nearly two decades. At higher rates, asymptotically thinned matrix alone. enhancement correlated with interconnected aggregates nanotubes, which themselves were induced conditions. Intermediate...
Abstract Untreated polyurethane flexible foams (PUFs) are prone to rapid fire growth due their low density and thermal conductivity. Furthermore, the viscosity of decomposition products generates severe dripping that increases hazard related combustion PUFs. In fact, this downward flow flaming liquid often results in a pool‐fire promotes flame propagation boosts rate heat release (HRR) significant increase burning area feed‐back between on residual foam. work effect nanoparticles, i.e.,...
Preparation of biocompatible and electrically-conducting chitin nanotube composite scaffold for potential use in implantable electrode stimulation repair neurons.
We have developed a novel process to convert low molecular weight microcrystalline cellulose into stiff regenerated fibers using dry-jet wet fiber spinning process. Highly aligned were spun from optically anisotropic cellulose/1-ethyl-3-methylimidazolium diethyl phosphate (EMImDEP) solutions. As the concentration increased 7.6 12.4 wt %, solution texture changed completely isotropic weakly nematic. Higher solutions (>15 %) showed strongly patterns, with clearing temperatures ranging 80 90...
Strong cellulose fibres and highly ordered carbon can be produced from solutions in superbase ionic liquids.
We report on the extraction of lignin from willow and its use to manufacture cellulose-lignin fibers as potential precursors for carbon fibers. The was extracted using triethylammonium hydrogen sulfate [Et3NH][HSO4]. by this process characterized ATR-IR elemental analysis, which indicated a high yield. 1-Ethyl-3-methylimidazolium acetate [C2C1im][OAc] then used common solvent dissolve cellulose lignin-cellulose fiber blends. Young's modulus 75:25 lignin/cellulose found be 3.0 ± 0.5 GPa,...
Applications of natural fibres are expanding, and sustainable alternatives needed to support this growing demand. We investigated the production using alginates from Saccharina latissima (SAC), Laminaria digitata (LAM), Sacchoriza polyschides (SACC), Himanthalia spp. (HIM). After extraction (3 % w/v biomass) a protocol based on citric acid, crude alginate represented 61-65 biomass dry weight for SAC LAM, 34-41 SACC HIM when experiments were performed at small scale (1.5 g starting material)....
We report studies of the orientation state multiwalled carbon nanotubes (MWNTs) dispersions in steady and transient shear flows. Uncured epoxy was used as a viscous Newtonian suspending medium samples were prepared from “aligned” MWNTs using methods previously reported [S. S. Rahatekar et al., J. Rheol. 50, 599 (2006)]. Orientation measurements performed both flow-gradient (1-2) flow-vorticity (1-3) plane simple flow situ x-ray scattering techniques. Steady 1-2 indicate that MWNT is rate...
The microstructure and deformation mechanics of carbon-nantotube networks are measured, demonstrate a crossover from strain-induced deformation, dominated by aggregates short rigid nanorods, to individual long semi-flexible nanotubes. Our results suggest that nanotubes provide the same network attributes as ones at modestly higher concentrations, but with significantly lower yield stress, which implies better processability.
Biomaterials that can stimulate stem cell differentiation without growth factor supplementation provide potent and cost-effective scaffolds for regenerative medicine. We hypothesize a scaffold prepared from cellulose silk blends direct chondrogenic fate. systematically with at different compositions using an environmentally benign processing method based on ionic liquids as common solvent. tested the effect of blend physical properties materials well their ability to support mesenchymal...
The molecular deformation and crystal orientation of a range next generation regenerated cellulose fibers, produced from an ionic liquid solvent spinning system, are correlated with macroscopic fiber properties. Fibers drawn at the stage to increase both in order achieve high tensile strength Young's modulus for potential use engineering applications. Raman spectroscopy was utilized quantify strain fibers deformed tension. X-ray diffraction used characterize single fibers. These techniques...
Alginate is a linear biodegradable polysaccharide polymer, which bio-renewable and widely used for various biomedical applications. For the next generation of medical textiles, alginate nanofibres are desirable their use in wound dressings that biocompatible, sustainable, abundantly available. This study has developed unique manufacturing process producing with exceptional antimicrobial properties oregano essential oil (OEO) as natural agent. OEO varying degrees concentration was...