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Browsing Research Publications/Outputs by Subject "X-ray diffraction"

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Characterisation of coal and chars in fluidised bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Falcon, R Date: Mar 2009 There 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
Characterisation of new natural cellulosic fabric Grewia tilifolia

Author: Jayaramudu, J ; Guduri, BR ; Rajulu, AV Date: Mar 2010 The new natural fabric Grewia tiliflia was extracted from its tree. This uniaxial fabric was analyzed by chemical, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and polarized ... Read more
Characteristics of laser In-situ alloyed titanium aluminides coatings

Author: Tlotleng, Monnamme ; Masina, Bathusile N ; Pityana, Sisa L Date: Jan 2017 The use of titanium aluminides as high temperature materials in the aerospace and automobile industries is becoming a reality since their early research and development in 1955. Their mechanical properties at elevated temperatures make them ... Read more
Comparison of the mechanically alloyed (V,W)C and (V,W)C-co powders

Author: Bolokang, AS Date: 2008 Milling was carried out in flowing argon but was interrupted at regular time intervals to take samples for Xray diffraction (XRD). Because of exposure to air during the interruptions the powder was partly oxidized. The oxides formed did not ... 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
Derivation of the liquidus surface projection for the Al-Pt-Ru system from as-cast samples

Author: Prins, SN ; Cornish, LA ; Boucher, PS Date: 10 Nov 2005 The liquidus surface projection for the Al-Pt-Ru ternary system has been determined based on the micro-structural characterisation of arc-melted alloys. The liquidus surface is dominated by the similarity to RuAl phase, and slopes down to the ... Read more
Determination of residual stresses in roll compacted titanium strips

Author: Mothosi, KL ; Chikosha, Silethelwe ; Madyira, DM ; Chikwanda, Hilda K Date: Jan 2017 Manufacturing processes typically produce residual stresses. The residual stresses can be advantageous when they are compressive and detrimental when tensile. In roll compaction of metal powder, similarly to rolling solid metals, substantial ... Read more
An easy two-step microwave assisted synthesis of SnO2/CNT hybrids

Author: Motshekga, SC ; Kesavan Pillai, Sreejarani ; Ray, SS ; Jalama, K ; Krause, RWM Date: Nov 2011 Tin oxide (SnO2) - decorated carbon nanotube (CNT) heterostructures were synthesized by microwave assisted wet impregnation method. CNTs of three different aspect ratios were compared. The hybrid samples were characterized by powder X-ray ... Read more
Effect of thermal treatment on mechanically milled cobalt powder

Author: Bolokang, AS ; Phasha, MJ ; Camagu, ST ; Motaung, DE ; Bhero, S Date: Mar 2012 Stabilization of the metastable FCC phase has been achieved after 10 h milled Co powder sintering at 1400 °C. Phase identification of the Co powders was performed by the X-ray diffraction analysis, while the microstructural analyses were ... Read more
Evaluation of chitosan/sisal fiber/polyethylene membranes

Author: Agboola, O ; Fayomi, OSI ; Sadiku, ER ; Ayoola, A ; Mokrani, T ; Mbuli, BS ; Popoola, P ; Perry, Goitseona S Date: Jul 2020 Composites of ternary blend of chitosan/sisal fiber/high density polyethylene, were prepared by using the Rheomixer, followed by hot press, in order to form dense microfiltration membranes. The effective operation of the membranes was tested ... Read more
Extraction and characterization of natural cellulose fibers from maize tassel

Author: Maepa, CE ; Jayaramudu, J ; Okonkwo, O ; Ray, SS ; Sadiku, ER ; Ramontja, J Date: Apr 2015 This article reports on the extraction and characterization of novel natural cellulose fibers obtained from the maize (tassel) plant. Cellulose was extracted from the agricultural residue (waste biomaterial) of maize tassel. The maize tassel ... Read more
Growth and characterisation of gold thin film layer using an ebeam evaporation system for surface plasmon resonance applications

Author: Malabi, Rudzani ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Khanyile, S ; Khamlich, S ; Maaza, M ; Mthunzi-Kufa, Patience Date: Apr 2019 Gold thin metal layers have been seen to be the most important signal amplification components in electrochemical and optical sensor applications. In surface plasmon resonance (SPR) applications, gold thin metal film possess electron densities ... Read more
Interaction between Yttria fully stabilized Zirconia or Yttria-Zirconia blended face-coat with Ti6Al4V during investment casting

Author: Mutombo, K ; Kgomo, C ; Rossouw, P Date: Oct 2014 The interaction between the Ti6Al4V alloy and the mould materials was investigated. The alpha-case was characterized by Vickers hardness tester, optical and scanning electron microscopy equipped with electron dispersive X-ray spectrometry ... Read more
Laser alloyed Al-Ni-Fe coatings

Author: Pityana, Sisa L ; Rossouw, R Date: Oct 2008 The aim of this work was to produce crack-free thin surface layers consisting of binary (Al-Ni, Al-Fe) and ternary (Al-Ni-Fe) intermetallic phases by means of a high power laser beam. The laser surface alloying was carried out by melting Fe ... Read more
Microstructures of alloyed and dispersed hard particles in the aluminium surface

Author: Pityana, Sisa L Date: Mar 2010 Laser surface alloying of A1200 aluminium alloy was carried out using a 4.4 kW Nd:YAG laser. Powder mixtures of SiC and TiC hard particles were injected into the laser generated melt pool on the aluminium substrate using a commercial powder ... Read more
Microstructures, wear and corrosion resistance of laser composite surfaced austenitic stainless steel (AISI 304 SS) with tungsten carbide

Author: Chakraborty, A ; Singh, JK ; Sen, D ; Pityana, Sisa L ; Manna, I ; Krishna, S ; Dutta Majumdar, J Date: Sep 2020 This study aims at the development of composite surface on austenitic stainless (AISI 304 stainless steel) by laser surface alloying with WC and Co in the weight ratio of 4:1. Laser processing has been carried out by laser melting of sandblasted ... Read more
Nanocauliflower like structure of CdS thin film for solar cell photovoltaic applications: Insitu tin doping by chemical bath deposition technique

Author: Wilson, KC ; Manikandan, E ; Basheer Ahamed, M ; Mwakikunga, Bonex W Date: 2014 We report on surface morphology changes of in situ tin (Sn) doped cadmium sulphide (CdS) thin film nanostructures prepared on a glass substrate using the chemical bath deposition (CBD) technique. Sn-doping in the presence of triethanolammine ... Read more
Smart 3D cell culture using a thermoresponsive PP nonwoven scaffold

Author: Chetty, A ; Rossouw, C ; Ntsangani, L ; Moolman, S ; Van Wyk, K ; Mancama, Dalubuhle T ; Anandjiwala, R ; Boguslavsky, L ; Vargha, V Date: May 2011 In this paper the grafting method will be described and characterisation of the smart PP-g-PNIPAAm scaffolds by fourier-transform infrared, scanning electron microscopy, x-ray photoelectron spectroscopy, differential scanning calorimetry, ... Read more
Smectite clay identification and quantification as an indicator of basic igneous rock durability

Author: Leyland, RC ; Verryn, S ; Momayez, M Date: Sep 2014 In terms of aerial extent, basic igneous rocks are one of the most used road building materials in South Africa. This is mainly due to the fact that approximately 57% of the surface lithology in South Africa is of poor road construction ... Read more
Spectroscopic characterization of a Nigerian standard sand: Igbokoda sand

Author: Ojuri, OO ; Shai, Jonas ; Aderibigbe, AD Date: Jan 2017 The characterization of the Nigerian Igbokoda Standard Sand was performed by X-ray diffraction, IR and Raman Spectroscopy, and nuclear magnetic resonance techniques. The principal reflections occurring at the d-Spacings of 4.25745, 3.34359, ... Read more

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