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Browsing by Author "Scriba, Manfred R"

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Chemical synthesis, characterization and evaluation of antimicrobial properties of Cu and its oxide nanoparticles

Author: Motlatle, Abesach M ; Kesavan Pillai, Sreejarani ; Scriba, Manfred R ; Ray, Suprakas S Date: Oct 2016 Cu nanoparticles were synthesized using low-temperature aqueous reduction method at pH 3, 5, 7, 9 and 11 in presence of ascorbic acid and polyvinylpyrrolidone. The nanoparticles were characterized using transmission electron microscopy, ... Read more
A classification and ranking system on the H2 gas sensing capabilities of nanomaterials based on proposed coefficients of sensor performance and sensor efficiency equations

Author: Mwakikunga, Bonex W ; Motshekga, S ; Sikhwivhilu, L ; Moodley, M ; Scriba, Manfred R ; Malgas, G ; Simo, A ; Maaza, M ; Ray, Suprakas S Date: Jul 2013 A coefficient of performance is defined based on the traditional definitions of response, S, of a chemoresistive sensing material to a specific gas from resistance–time data. The new definition not only considers the S(sub response) and S(sub ... Read more
A combined experimental and theoretical approach to establish the relationship between shear force and clay platelet delamination in melt-processed polypropylene nanocomposites

Author: Bandyopadhyay, J ; Ray, Suprakas S ; Scriba, Manfred R ; Wesley-Smith, J Date: Apr 2014 In this article, a combined experimental and theoretical approach has been proposed to establish a relationship between the required shear force and the degree of delamination of clay tactoids during the melt-processing of polymer nanocomposites. ... Read more
Composition and crystallinity of silicon nanoparticles synthesised by hot wire thermal catalytic pyrolysis at different pressures

Author: Scriba, Manfred R ; Britton, DT ; Arendse, C ; van Staden, MJ ; Härting, M Date: Apr 2009 The effect of pressure on the structure and composition of silicon nanoparticles synthesized by hot wire thermal catalytic pyrolysis (HW-TCP) of pure silane has been investigated. Light brown powders were produced at silane pressures of 10 ... Read more
Effect of Organoclay on the Properties of Maleic Anhydride-Grafted Polypropylene and Poly(methyl methacrylate) Blend

Author: Hato, Mpitloane Joseph ; Motaung, David E ; Choi, Hyoung Jin ; Scriba, Manfred R ; Khumalo, Vincent M ; Malwela, Thomas Date: Mar 2017 Poly(methyl methacrylate)/polypropylene (PMMA/PP) and PMMA/maleic-anhydride grafted PP (MAPP) blends and their blend nanocomposites containing 2 wt% organoclay (Cloisite 15A, denoted C15A), prepared by a melt mixer were studied. Both X-ray ... Read more
The effect of reducing agents on the electronic, magnetic and electrocatalytic properties of thiol-capped Pt/Co and Pt/Ni nanoparticles

Author: Mathe, Ntombizodwa R ; Nkosi, SS ; Motaung, DE ; Scriba, Manfred R ; Coville, NJ Date: May 2015 The electronic, magnetic and electrocatalytic properties of bimetallic thiol-capped Pt/Co and Pt/Ni nanoparticles were synthesised using two reducing agents, NaBH(sub4) and N(sub2)H(sub4). X-ray diffraction analysis of the nanoparticles showed ... Read more
Electrically active, doped monocrystalline silicon nanoparticles produced by hot wire thermal catalytic pyrolysis

Author: Scriba, Manfred R ; Britton, DT ; Härting, M Date: May 2011 Doped silicon nanoparticles have successfully been produced by hot wire thermal catalytic pyrolysis at 40 mbar and a filament temperature of 1800 °C, using a mixture of silane and diborane or phosphine. All particles are monocrystalline with ... Read more
Hot wire and spark pyrolysis as simple new routes to silicon nanoparticle synthesis

Author: Scriba, Manfred R ; Britton, DT ; Härting, M Date: Nov 2012 Monocrystalline silicon nanoparticles with a mean diameter of between 30 and 40 nm have been synthesised by hot wire thermal catalytic and spark pyrolysis at a pressure of 40 and 80 mbar respectively. For the production a mixture of the ... Read more
Hot-wire chemical vapour deposition of carbon nanotubes

Author: Cummings, FR ; Arendse, CJ ; Malgas, GR ; Scriba, Manfred R ; Knoesen, D ; Theron, CC Date: Jul 2006 Owing entirely to their structure, carbon nanotubes (CNTs) possess some of the most remarkable chemical and physical properties. More specifically, they exhibit exceptional strength and toughness, chemical inertness, magnetism, and electrical ... Read more
Hot-wire synthesis of Si nanoparticles

Author: Scriba, Manfred R ; Arendse, CJ ; Harting, M ; Britton, DT Date: Jan 2008 The viability of producing silicon nanoparticles using the HWCVD process is investigated. A system is assembled and particles are produced from silane at pressures between 0.2 – 48 mbar, with hydrogen dilutions of 0-80%, at a total flow rate ... Read more
The impact of nanoclay on the crystal growth kinetics and morphology of biodegradable poly(ethylene succinate) composite

Author: Bandyopadhyay, J ; Ray, SS ; Scriba, Manfred R ; Malwela, T Date: Jul 2012 The impact of nanoclay on the isothermal crystal growth kinetics and morphology of biodegradable poly(ethylene succinate) (PES) is reported. A PES composite (PESNC) containing 5 wt% organically modified montmorillonite, was prepared via solvent ... Read more
Methanol oxidation reaction activity of microwave irradiated and heat-treated Pt/Co and Pt/Ni nano-electrocatalysts

Author: Mathe, Ntombizodwa R ; Scriba, Manfred R ; Coville, NJ Date: Nov 2014 Bimetallic Pt nanoparticles were prepared by alloying Pt with the non-noble transition metals, Co and Ni, using a conventional heat-treatment (HT) method and microwaveirradiation (MW). The resulting samples were PteCo-Ht, PteNi-HT, PteCo, MW ... Read more
Microwave assisted green synthesis and characterization of silver/montmorillonite heterostructures with improved antimicrobial properties

Author: Kesavan Pillai, Sreejarani ; Ray, Suprakas S ; Scriba, Manfred R ; Bandyopadhyay, J ; Roux-van der Merwe, MP ; Badenhorst, J Date: Oct 2013 Silver (Ag)/montmorillonite (Mt) heterostructures were effectively synthesized utilising microwave (MW) irradiation technique in the absence of any reducing agent. Compared to conventional thermal reduction processes, this approach is simple, ... Read more
Microwave assisted organic modification and surface functionalization of Phyllosilicates

Author: Kesavan Pillai, Sreejarani ; Moyo, Lumbidzani ; Ray, Suprakas S ; Scriba, Manfred R Date: Nov 2012 Organically modified phyllosilicates (montmorillonite and palygorskite) using Arquad 2HT-75 surfactant were effectively synthesized utilizing a microwave irradiation technique. The microwave method was successfully used also for the surface ... Read more
Microwave-irradiation polyol synthesis of PVP-protected Pt–Ni electrocatalysts for methanol oxidation reaction

Author: Mathe, Ntombizodwa R ; Scriba, Manfred R ; Rikhotso, Rirhandzu S ; Coville, NJ Date: 2017 Bimetallic Pt–Ni nanoparticles were synthesized for use as electrocatalysts for the methanol oxidation reaction using a cost-effective microwave-irradiation synthesis procedure that offers precise temperature control. By varying the concentration ... Read more
Morphological and thermal properties of photodegradable biocomposite films

Author: Kesavan Pillai, Sreejarani ; Ray, SS ; Scriba, Manfred R ; Ojijo, Vincent O ; Hato, MJ Date: Jul 2013 Biocomposites containing ultraviolet (UV) radiation absorbing inorganic nanofillers are of great interest in food packaging applications. The biodegradable polylactide (PLA) composite films were prepared by solvent casting method by incorporating ... Read more
Polyaniline-clay composite-containing epoxy coating with enhanced corrosion protection and mechanical properties

Author: Motlatle, Abesach M ; Ray, Suprakas S ; Scriba, Manfred R Date: Nov 2018 The corrosion of steel is a worldwide industrial problem. In this study, we demonstrate that polyaniline (PANI), an extensively studied additive for organic coatings that affords corrosion protection, can be imbedded in epoxy, as a pigment ... Read more
Self assembly and properties of C:WO3 nano-platelets and C:VO2/V2O5 triangular capsules produced by laser solution photolysis

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Scriba, Manfred R ; Manikandan, E Date: 2009 Laser photolysis of WCl6 in ethanol and a specific mixture of V2O5 and VCl3 in ethanol lead to carbon modified vanadium and tungsten oxides with interesting properties. The presence of graphene’s aromatic rings (from the vibrational frequency ... Read more
Self assembly and properties of C:WO3 nano-platelets and C:VO2/V2O5 triangular capsules produced by laser solution photolysis

Author: Mwakikunga, Bonex W ; Forbes, A ; Sideras-Haddad, E ; Scriba, Manfred R ; Manikandan, E Date: 2010 Laser photolysis of WCl6 in ethanol and a specific mixture of V2O5 and VCl3 in ethanol lead to carbon modified vanadium and tungsten oxides with interesting properties. The presence of graphene’s aromatic rings (from the vibrational frequency ... Read more
Synthesis of anisotropic CdS nanostructures via a single-source route

Author: Rajasekhar Pullabhotla, VSR ; Scriba, Manfred R ; Revaprasadu, N Date: Feb 2011 A cadmium tetrahydroisoquinoline dithiocarbamate (DTC) complex has been used as single-source precursor for the synthesis of highly faceted hexadecylamine (HDA) capped CdS nanoparticles. Hexagonal and close to cubic shaped particles with ... Read more

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