A5053837229- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Electrochemical Analysis and Applications
- Advanced Chemical Sensor Technologies
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Conducting polymers and applications
- Air Quality Monitoring and Forecasting
- Advanced biosensing and bioanalysis techniques
- Concrete Corrosion and Durability
- Planetary Science and Exploration
- Air Quality and Health Impacts
- Transition Metal Oxide Nanomaterials
- Polymer Surface Interaction Studies
- Spaceflight effects on biology
- Electrochemical sensors and biosensors
- Light effects on plants
- Microfluidic and Bio-sensing Technologies
- Molecular Junctions and Nanostructures
- Anodic Oxide Films and Nanostructures
- Atmospheric chemistry and aerosols
- Microfluidic and Capillary Electrophoresis Applications
- Electron and X-Ray Spectroscopy Techniques
- Electronic and Structural Properties of Oxides
- Force Microscopy Techniques and Applications
MacDiarmid Institute for Advanced Materials and Nanotechnology
2015-2025
University of Auckland
2016-2025
Victoria University of Wellington
2011-2021
University of British Columbia
1993-2019
Qatar University
2018
University College London
1999-2017
Johnson Space Center
2003-2015
Dublin City University
2009-2015
Vancouver Biotech (Canada)
2015
Wellington Hospital
2014-2015
Detailed measurements are reported of the dependence conductance porous, sintered pellets tin dioxide, on temperature, moisture and oxygen partial pressure. Comparison is made with behaviour thin layers prepared by radio-frequency sputtering. The effect introducing a non-equilibrium mixture combustible gas in air, activation energy described. theoretical basis for current interpretations this material reviewed. results discussed using model which porous controlled different sorts intergrain...
Background Neuroblastoma is one of the most challenging malignancies childhood, being associated with highest death rate in paediatric oncology, underlining need for novel therapeutic approaches. Typically, patients high risk disease undergo an initial remission response to treatment, followed by recurrence that has become refractory further treatment. Here, we demonstrate first silica nanoparticle-based targeted delivery a tumor suppressive, pro-apoptotic microRNA, miR-34a, neuroblastoma...
A stochastic model for pit initiation is developed, involving as parameters an frequency nuclei, a death probability unstable pits, and critical age which defines the transition between stable pit. Emphasis placed on validating methods data analysis to recover of from observed current‐time series. Such are developed tested using generated by computer simulation process. The expected induction time derived. Results statistics ensembles transients given. Methods spectral power density current,...
It has been shown earlier (J. F. McAleer, P. T. Moseley, J. O. W. Norris and D. E. Williams, Chem. Soc., Faraday Trans. 1, 1987, 83, 1323) that the gas response of porous pellets tin dioxide depends crucially on electronic surface states involving adsorbed oxygen, rates combustion reactions gases to be detected. is expected, therefore, use additives capable either pinning Fermi level or altering rate (depending choice material temperature) would profoundly affect sensor material. This found...
Background: There is contradictory evidence for a role of dietary fat in risk multiple sclerosis (MS). Objectives: To examine the association between usual intake (total, saturated, monounsaturated (MUFA), polyunsaturated (PUFA), omega-3 and omega-6) first clinical diagnosis CNS demyelination (FCD). Methods: Multi-centre incident case-control study four regions Australia during 2003–2006. Cases were aged 18–59 years had FCD; controls matched to case on age, sex location. Dietary data...
Scanning electrochemical microscopy with submicron resolution shows that the local current density for dissolution of certain MnS inclusions in stainless steel can be extremely high (>1 A cm−2 and appears to chloride‐catalyzed, a result not anticipated by previous work on chemically prepared MnS. The forms sulfur‐rich crust extending over inclusion surrounding metal. Photoelectrochemical optical indicate formation stain around an is necessary preliminary initiation pit show attack metal...
We have carried out a computational bulk and surface study of the behavior Sb(III) Sb(V) ions on (110) (001) surfaces SnO2. In addition, we also examined Sn(II) oxygen vacancy complex in surface. These calculations suggest that is associated with in-plane species, while subsumed below bridging more bulk-like environment. find two possible Sn(II)/Ovacancy sites for surface: one vacancy, most favorable arrangement an subsurface vacancy. indicate not only but predict segregation defect...
Diffuse reflectance spectra of 15 mineral species commonly associated with sulphide-bearing mine wastes show diagnostic absorption bands related to electronic processes involving ferric and/or ferrous iron, and vibrational water hydroxyl. Many these are relatively broad overlapping; however, spectral analysis methods, including continuum removal derivative analysis, permit most the minerals be distinguished. Key differences between illustrated in a series plots showing major band centres...
Conformational orientations of a mouse monoclonal antibody to the β unit human chorionic gonadotrophin (anti-β-hCG) at hydrophilic silicon oxide/water interface were investigated using atomic force microscopy (AFM) and neutron reflectivity (NR). The surface structural characterization was conducted with concentration in solution ranging from 2 50 mg·L-1 ionic strength kept 20 mM pH = 7.0. It found that adopted predominantly "flat-on" orientation, Fc two Fab fragments lying flat on surface....
This paper presents a novel low-cost instrument that uses sensor based on conductivity changes of heated tungstic oxide, which is capable accurately measuring ambient concentrations ozone. A combination temperature steps and air flow-rate used to continually reset re-zero the sensor. two-stage calibration procedure presented, in nonlinear transformation converts resistance signal linear ozone concentration, then correlation align with reference instrument. The required functions specific for...
A cost-efficient technology for accurate surface ozone monitoring using gas-sensitive semiconducting oxide (GSS) technology, solar power, and automated cell-phone communications was deployed validated in a 50 sensor test-bed the Lower Fraser Valley of British Columbia, over 3 months from May-September 2012. Before field deployment, entire set instruments colocated with reference at least 48 h, comparing hourly averaged data. The standard error estimate typical range 0-50 ppb ± 2 ppb....
Plausibility of data from networks low-cost measurement devices is a growing and important contentious issue. Informal have particularly come to prominence for air quality monitoring. The point the believability without regular on-site calibration since that specialist task costs very quickly become much larger than cost installation in first place. This article suggests approaches problem involve appropriate use independent information potential resolve contention. Ideas are illustrated...