Author:Oboirien, BO; Engelbrecht, AD; North, Brian C; Du Cann, VM; Falcon, RDate:Mar 2009There is currently a gap in the understanding of the morphological transformations experienced by high ash and intertinite-rich coals undergoing conversion to char during atmospheric gasification. In this study, work has been carried to ...Read more
Author:Scriba, Manfred R; Britton, DT; Arendse, C; van Staden, MJ; Härting, MDate:Apr 2009The 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
Author:Konadu, DS; Van der Merwe, J; Potgieter, JH; Potgieter-Vermaak, S; Machio, Christopher NDate:Sep 2010The effect of increasing vanadium carbide (VC) content on the corrosion behaviour of tungsten carbide – 10 wt% cobalt hard metals was investigated in 1 M hydrochloric (HCl), and sulphuric (H2SO4) acids solutions. Increasing VC content makes ...Read more
Author:Lamprecht, GH; Human, HGC; Snyman, LWDate:Oct 2007The viability of using pulsed laser excited Raman spectroscopy as a method for diamond detection from ore, has been investigated. In this method the spontaneous Stokes Raman signal is used as indicator of diamond, and a dual channel system ...Read more
Author:Malgas, GF; Arendse, CJ; Cele, NP; Cummings, FRDate:Feb 2008This paper reports on the growth of carbon nanotubes (CNTs) by thermal Chemical Vapour Deposition (CVD) and investigates the effects of nitrogen carrier gas flow rates and mixture ratios on the morphology of CNTs on a silicon substrate by ...Read more
Author:Katumba, G; Mothibinyane, TR; Mwakikunga, Bonex WDate:Nov 2008Coatings of carbon nanoparticles dispersed in SiO2, ZnO and NiO matrices on aluminium substrates have been fabricated by a sol–gel technique. Spectrophotometry was used to determine the solar absorptance and the thermal emittance of the ...Read more
Author:Motaung, DE; Moodley, MK; Manikandan, E; Coville, NJDate:2010Single-walled carbon nanotubes (SWCNTs) are unique one-dimensional nanostructure with extraordinary electronic, thermal, optical, and mechanical properties. These properties make SWCNTs suitable materials for a wide range of advanced technological ...Read more
Author:Malgas, GF; Arendse, CJ; Mavundla, S; Cummings, FRDate:Aug 2008Interfacial analysis of the rrP3HT samples spincoated on a glass substrate was studied in detail using transmission electron microscopy (TEM) and SEM measurements. Very homogeneous and smooth polymer (P3HT and PEDOT:PSS) layers are observed ...Read more
Author:Gayathri, S; Ghosh, OSN; Sathishkumar, S; Sudhakara, S; Jayaramudu, J; Ray, SS; Viswanath, AKDate:Dec 2015In this report we have demonstrated the synthesis of silver doped and pure ZnO nanoparticles using facile chemical precipitation method. The crystal structure, optical and magnetic properties of the synthesized nanocrystals were determined ...Read more
Author:Machaka, Ronald; Mwakikunga, Bonex W; Manikandan, E; Derry, TE; Sigalas, IDate:2011Despite hot pressing being the most popular method of consolidating B6O powder, the Raman spectrum of polycrystalline hot-pressed B6O was until now poorly understood. Yet, recent reports have contributed to the understanding of only high-pressure ...Read more
Author:Moodley, MKDate:05 Jul 2006In Raman spectra of SWCNTs, there are many features which can be identifed with specific phonon modes and with specific Raman scattering processes that contribute to each feature. Mechanical, elastic and thermal properties are strongly ...Read more
Author:Andreev, GN; Barzev, ADate:16 Dec 2003The ability of Raman spectroscopy to investigate chemical substances in water media was applied for studying the surface products of the chalcopyrite-sodium isopropyl xanthate flotation system. Performing the reaction in model conditions, ...Read more
Author:Mwakikunga, Bonex W; Sideras-Haddad, E; Forbes, A; Arendse, CDate:2008Novel optical and electrical properties of newly synthesized nano-wires of monoclinic WO3 and nano-belts of rutile VO2 have been investigated by Raman spectroscopy and thermochromism studies respectively. Phonon confinement is observed in the ...Read more
Author:Moodley, MK et al.Date:27 Feb 2006Single-walled carbon nanotubes were synthesised by the laser vaporisation of graphite composite targets in a tube furnace. Two pulsed Nd:YAG lasers operating at fundamental (1 064 nm) and 2nd harmonic (532 nm) were combined, focused and ...Read more
Author:Moodley, MK; Coville, NJ; Holloway, BC; Maaza, MDate:Jul 2006Single walled carbon nanotubes were synthesized by the laser vaporization of graphite composite targets in a tube furnace. Two pulsed Nd:Yag lasers operating at fundamental (1064 nm) and 2 nd harmonic (532 nm) were combined, focused and ...Read more
Author:Masina, Bathusile N; Mwakikunga, Bonex W; Elayaperumal, M; Forbes, A; Bodkin, RDate:Jul 2011At present it is known that diamond tool degrades with time as it is normally used at high temperatures. One of the question the authors like to answer in this study is whether thermally induced problems in diamond tool arise as a result of ...Read more
Author:Arendse, CJ; Malgas, G; Oliphant, CJ; Muller, TFG; Knoesen, DDate:2009The material properties of hydrogenated amorphous silicon (a-Si:H) have been known to change when exposed to elevated temperatures. In this work researchers report on the thermal stability of the optical band gap and structural disorder in ...Read more