Chemistry (Scholarly Publications): Recent submissions
Now showing items 901-920 of 931
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Preparation and biological investigation of luminescent water soluble CdTe nanoparticles
(SPIE, 2005)In this study CdTe quantum dots have been successfully prepared in aqueous medium using several different thiol stabilizers. The resulting nanocrystals were purified and the photoluminescence efficiency was subsequently ... -
New two in one magnetic fluorescent nanocomposites
(SPIE, 2005)Magnetite nanoparticles have been coated by a porphyrin derivative to produce new magnetic materials with fluorescent properties. The magnetic nanoparticles were prepared using two different methods, one based on sol-gel ... -
Investigations on europium doped alumino-silicate xerogel incorporated in micro-channel glass and porous silicon
(2005)Porous materials in general have received great attention from the last century. The development of new porous materials and the preparation of new composites based on porous materials is a subject of interest. The development ... -
Fabrication and characterisation of photonic nanowires
(SPIE, 2008)In recent years the application of nano-porous templates, such as anodic alumina and PTFE, in the production of cylindrical nanostructures has been vast. In our work we used porous alumina membranes to produce luminescent ... -
New palladium catalysed reactions of bromoporphyrins: synthesis and crystal structures of nickel(II) complexes of primary 5-aminoporphyrin, 5,5'-bis(porphyrinyl) secondary amine, and 5-hydroxyporphyrin
(2006)Primary aminoporphyrin, secondary bis(porphyrinyl)amine and hydroxyporphyrin complexes have been isolated and characterised both spectroscopically and crystallographically from the reaction of 5-bromo-10,15,20-triphenylp ... -
Exercises in molecular gymnastics - Bending, stretching and twisting porphyrins. (invited feature article)
(2006)The functional versatility of tetrapyrroles as natural cofactors is related to their conformational flexibility where manipulation of the macrocycle conformation allows a fine-tuning of their physicochemical properties. ... -
Immobilized enzyme/single-wall carbon nanotube composites for amperometric glucose detection at very low applied potential
(Royal Chemical Society, 2008)The behaviour of support electrodes modified with randomly dispersed single-wall carbon nanotube meshes containing adsorbed glucose oxidase with respect to amperometric glucose detection at a low potential is demonstrated. -
The oxygen evolution reaction on passive oxide covered transition metal electrodes in aqueous alkaline solution. Part 1 - Nickel
(Electrochemical Science Group, 2008)Various aspects of the oxygen evolution reaction (OER) at passive oxide covered polycrystalline Ni electrodes in aqueous alkaline solution were investigated using electrochemical techniques. Steady state polarisation and ... -
Carbon nanotube based modified electrode biosensors. Part 1. Electrochemical studies of the flavin group redox kinetics at SWCNT/glucose oxidase composite modified electrodes.
(Electrochemical Science Group, 2008)The redox behaviour of glucose oxidase adsorbed on glassy carbon electrodes which have been modified with a dispersed mesh of single wall carbon nanotubes is probed both qualitatively and quantitatively using cyclic ... -
The oxygen evolution reaction on passive oxide covered transition metal electrodes in alkaline solution. Part 2-Cobalt.
(Electrochemical Science Group, 2008)Details are outlined of an electrochemical investigation of the oxygen evolution reaction (OER) at passive oxide covered polycrystalline Co electrodes in aqueous alkaline solution. Kinetic studies on electrodes subjected ... -
The oxygen evolution reaction on passive oxide covered transition metal electrodes in alkaline solution. Part III - Iron.
(Electrochemical Science Group, 2008)The kinetics of the oxygen evolution reaction (OER) at passive oxide covered polycrystalline Fe electrodes in aqueous alkaline solution were examined using both dc steady state polarisation and ac impedance techniques. ... -
The significance of electrochemical impedance spectra recorded during active oxygen evolution for oxide covered Ni, Co and Fe electrodes in alkaline solution
(Elsevier, 2009)Although the mechanism for the oxygen evolution reaction (OER) is likely to be similar for oxidised electrodes of the adjacent transition metals Ni, Co and Fe, the electrochemical impedance spectra, recorded for each of ... -
Redox switching and oxygen evolution electrocatalysis in polymeric iron oxyhydroxide films
(Royal Scoety of Chemistry, 2009)Outstanding issues regarding the redox switching characteristics and the oxygen evolution reaction (OER) electrocatalytic behaviour of multicycled iron oxyhydroxide films in aqueous alkaline solution have been examined. ... -
The effects of thin layer diffusion at glassy carbon electrodes modified with porous films of single-walled carbon nanotubes
(Electrochemical Science Group, 2009)Due to their small size and remarkable electrical properties, carbon nanotubes have been used to modify electrode surfaces to create sensors for a range of important analytes. In this study, glassy carbon (GC) electrodes ... -
Reaction/diffusion at electrode/solution interfaces: the EC2 reaction
(Electrochemical Science Group, 2009)A closed form analytical expression is derived for the normalized current versus potential response expected for a rotating disc electrode in which an initial fast electron transfer reaction is followed by a homogeneous ... -
Paving the way to the integration of smart nanostructures. Part 1: nanotethering and nanowiring via material nanoengineering and electrochemical identification
(Electrochemical Science Group, 2009)In this review essay some recent approaches to nanotethering and nanowiring of biomolecules such as redox enzymes and nanoparticles to solid surfaces to generate chemically modified electrodes to serve as platforms for ... -
Transport and kinetics at carbon nanotube- redox enzyme composite modified electrode biosensors. Part 2. Redox enzyme dispersed in nanotube mesh of finite thickness.
(Electrochemical Science Group, 2009)A mathematical model describing the transport and kinetics of substrate and redox mediator in surface deposited films of finite thickness is described. These bio-catalytically active chemically modified electrodes comprise ... -
Transport and kinetics at carbon nanotube-redox enzyme composite modified electrode biosensors
(Electrochemical Science Group, 2009)A mathematical model describing transport and kinetics of substrate and redox mediator within chemically modified electrodes comprising of redox enzymes immobilized in dispersed carbon nanotube meshes dispersed on support ... -
Allenylporphyrins: a new motif on the porphyrin periphery
(2009)Palladium-catalysed Suzuki?Miyaura cross-coupling proved to be the simplest and most efficient method for attaching an unsubstituted allene, a novel substituent and potential functional group, to the porphyrin periphery. ... -
Exploration of the reaction of potassium organotrifluoroborates with porphyrins
(2009)A general method that uses potassium organotrifluoroborates in the Suzuki?Miyaura cross-coupling reaction with ring-brominated porphyrins has been investigated. The reaction conditions tolerate various functional groups ...
