A5021955514- Advanced Materials Characterization Techniques
- Environmental Impact and Sustainability
- Metallurgical and Alloy Processes
- Photovoltaic Systems and Sustainability
- Energy and Environment Impacts
- Metal and Thin Film Mechanics
- Electrocatalysts for Energy Conversion
- Intermetallics and Advanced Alloy Properties
- Advanced materials and composites
- Advanced Electron Microscopy Techniques and Applications
- Quasicrystal Structures and Properties
- Catalytic Processes in Materials Science
- Recycling and Waste Management Techniques
- Extraction and Separation Processes
- Additive Manufacturing and 3D Printing Technologies
- Electrochemical Analysis and Applications
- Metallurgical Processes and Thermodynamics
- Material Properties and Applications
- Fuel Cells and Related Materials
- Social Acceptance of Renewable Energy
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- Water-Energy-Food Nexus Studies
University of Cape Town
2007-2024
Macquarie University
2013-2023
Abstract Implantable medical devices (IMDs) have experienced a rapid progress in recent years to the advancement of state‐of‐the‐art practices. However, majority this equipment requires external power sources like batteries operate, which may restrict their application for vivo situations. Furthermore, these IMDs need be changed at times by surgical processes once expired, causing bodily and psychological annoyance patients rising healthcare financial burdens. Currently, harvesting...
Each single upconversion nanocrystal (UCNC) usually contains thousands of photon sensitizers and hundreds activators to up-convert near-infrared photons into visible ultraviolet emissions. Though in principle further increasing the sensitizers' concentration will enhance absorption efficiency produce brighter nanocrystals, typically 20% Yb3+ ions has been used avoid so-called "concentration quenching" effect. Here we report that quenching effect does not limit sensitizer NaYbF4 is most...
The demand for clean energy is strong, and the shift from fossil-fuel-based to environmentally friendly sources next step eradicating world’s greenhouse gas (GHG) emissions. Solar technology has been touted as one of most promising low-carbon, non-fossil fuel production. However, true potential solar-based technologies established by augmenting efficiency through satisfactory environmental performance in relation other renewable systems. This paper presents an life-cycle assessment (LCA) a...
This work, for the first time, reports visible-light active bare graphitic carbon nitride nanotubes (C3N4 NTs) photocatalytic hydrogen generation, even in absence of any cocatalyst. Upon uniform dispersion cocatalysts, Ag-Cu nanoparticles, on well-ordered C3N4 NTs, they exhibit twice H2 evolution rate NTs. The improved activity is attributed to their unique tubular nanostructure, strong metal-support interaction, and efficient photoinduced electron-hole separation compared monometallic...
Batteries have been extensively used in many applications; however, very little is explored regarding the possible environmental impacts for their whole life cycle, even though a lot of studies carried out augmenting performance ways. This research paper addresses effects two different types batteries, lithium-ion (LiIo) and nickel-metal hydride (NiMH) terms chemical constituents. Life cycle impact analysis has by CML, ReCiPe, EcoPoints 97, IPCC, CED methods. The are considered categories...
We report a rapid solution-phase strategy to synthesize alloyed PtNi nanoparticles which demonstrate outstanding functionality for the oxygen reduction reaction (ORR). This one-pot co-reduction colloidal synthesis results in monodisperse population of single-crystal rhombic dodecahedral morphology, with Pt enriched edges and compositions close Pt1Ni2. use nanoscale 3D compositional analysis reveal first time that oleylamine (OAm)-aging Pt1Ni2 particles Ni leaching from surface facets,...
Optical biomedical imaging using luminescent nanoparticles as contrast agents prefers small size, they can be used at high dosages and efficiently cleared from body. Reducing nanoparticle size is critical for the stability specificity fluorescence probes in vitro diagnostics subcellular imaging. The development of smaller brighter upconversion (UCNPs) accordingly a goal complex bioenvironments. At present, however, UCNPs are reported to exhibit less emission intensity due increased surface...
Hydropower is the oldest and most common type of renewable source electricity available on this planet. The end life process hydropower plant have significant environmental impacts, which needs to be identified minimized ensure an environment friendly power generation. However, identifying impacts health hazards are very little explored in processing routes despite a quantity production worldwide. This paper highlight life-cycle impact assessment reservoir based generation system located...
The use of magnetic nanomaterials in biosensing applications is growing as a consequence their remarkable properties; but controlling the composition and shape metallic nanoalloys problematic when more than one precursor required for wet chemistry synthesis. We have developed successful simultaneous reduction method preparation near-spherical platinum-based containing solutes. avoided particular difficulties preparing platinum Ni, Co Fe by identification appropriate synthesis temperatures...
The properties of nanoparticles are known to critically depend on their local chemistry but characterizing three-dimensional (3D) elemental segregation at the nanometer scale is highly challenging. Scanning transmission electron microscope (STEM) tomographic imaging one few techniques able measure for inorganic conventional methodologies often fail due high dose imparted. Here, we demonstrate realization a new spectroscopic single particle reconstruction approach built method developed by...
Developing solid solution nanoparticles with complex faceted geometries and unusual composition sectoral zoning can enhance their catalytic performance. In a solution-phase synthesis of PtNi nanoparticles, we show that mixture surfactants results in surface functionalization, which turn controls the morphological evolution nanoparticles. The exhibited chemical growth zoning, rich Pt geometric topologies, varied as function surfactant mixture. Compositional mapping, using high-angle annular...
Microgrids (MGs) are playing an important role in the maximum utilization of distributed energy resources. The optimal economic operation and low-carbon electricity generation can enhance MGs effectiveness. This paper presents results a solar-photovoltaic (PV)-driven islanded MG's techno-economic optimization analysis environmental life-cycle assessment (LCA) to achieve economical environmentally superior performance. A net present cost (NPC)-based simulation for sizing MG is proposed. novel...
Complex faceted geometries and compositional anisotropy in alloy nanoparticles (NPs) can enhance catalytic performance. We report on the preparation of binary PtNi NPs via a co-thermolytic approach which we optimize synthesis variables, results significantly improved used scanning transmission electron microscopy to characterise range morphologies produced, included spherical concave cuboidal core-shell structures. Electrocatalytic activity was evaluated using rotating disc electrode (1600...