Author:Lekitima, JN; Ozoemena, KI; Jafta, CJ; Kobayashi, N; Song, Y; Tong, D; Chen, S; Oyama, MDate:2013A novel asymmetric electrochemical capacitor (AEC) with high energy and power densities has been developed using a graphene oxide/cobalt(II)tetrapyrazinoporphyrazine composite (GO/CoTPyzPz) as the positive electrode and graphene oxide/carbon ...Read more
Author:Ramontja, J; Ray, SS; Kesavan Pillai, Sreejarani; Luyt, ASDate:Dec 2009The inherent properties of poly(lactide), a biocompatible and biodegradable polymer, are concurrently improved by the incorporation of a small amount of surface functionalized carbon nanotubes. A new method has been used to functionalize the ...Read more
Author:Rapulenyane, Nomasonto; Ferg, E; Luo, HongzeDate:Sep 2018In a quest to produce cathode materials for lithium ion batteries that yield high capacities, the Li1.2Mn0.6Ni0.2O2, lithium-manganese rich cathode materials were synthesized via a facile one-pot co-precipitation process with various ratios ...Read more
Author:Hou, S; Chen, R; Zou, H; Shu, T; Ren, Jianwei; Li, X; Liao, SDate:Jun 2016A novel self-humidifying membrane electrode assembly (MEA) with homemade multifunctional Pt/SnO(sub2)-SiO(sub2)/C as the anode was developed to improve the performance of a proton exchange membrane fuel cell under low humidity. The MEAs' ...Read more
Author:Chauke, VP; Maity, Arjun; Chetty, ADate:Jul 2015Graphene oxide (GO) was functionalized with alpha cyclodextrin (aCD) through a covalent bond to form GO-aCD nanocomposites (NC). GO-aCD NC was further modified with polypyrrole (PPY) to afford an advanced GO-aCD-PPY NC for the removal of ...Read more
Author:Makgopa, K; Ejikeme, PM; Jafta, CJ; Raju, Kumar; Zeiger, M; Presser, V; Ozoemena, KIDate:Jan 2015We present a study on the pseudocapacitive properties of birnessite-type MnO(sub2) grafted on highly graphitized onion-like carbon (OLC/MnO(sub2)). In a three-electrode setup, we evaluated two different substrates, namely a platinum disc and ...Read more
Author:Engelbrecht, CJ; Engelbrecht, FA; Dyson, LLDate:Jan 2012Mid-tropospheric closed-lows (cold-core cut-off lows and warm-core tropical lows) are important rain producing weather systems for the southern Africa region. Over South Africa, most wide-spread flood events are caused by these systems. It ...Read more
Author:Thomalla, Sandy J; Racault, M; Swart, S; Monteiro, Pedro MSDate:Jul 2015In the Southern Ocean, there is increasing evidence that seasonal to subseasonal temporal scales, and meso- to submesoscales play an important role in understanding the sensitivity of ocean primary productivity to climate change. This drives ...Read more
Author:Van Schoor, Michael; Du Pisani, P; Vogt, DDate:Jul 2006The economic horizons of the two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of ...Read more
Author:Cobbinah, PV; Matizamhuka, W; Machaka, Ronald; Shongwe, MB; Yanabe-Mitaria, YDate:Jan 2021In this study, -TiAl based alloys of composition Ti-46.5Al-%xTa (x = 0.8, 4 and 8 at.%) were fabricated by mechanical alloying and consolidated by spark plasma sintering. The main objective of the study was to evaluate the influence Ta contents ...Read more
Author:Cobbinah, PV; Matizamhuka, W; Machaka, Ronald; Shongwe, MB; Yanabe-Mitaria, YDate:Jan 2021In this study, -TiAl based alloys of composition Ti-46.5Al-%xTa (x = 0.8, 4 and 8 at.%) were fabricated by mechanical alloying and consolidated by spark plasma sintering. The main objective of the study was to evaluate the influence Ta contents ...Read more
Author:Van den Berg, N; Crampton, BG; Hein, I; Birch, PRJ; Berger, DKDate:Nov 2004Efficient construction of cDNA libraries enriched for differentially expressed transcripts is an important first step in many biological investigations. We present a quantitative procedure for screening cDNA libraries constructed by suppression ...Read more
Author:Ngubane, NAC; Gresh, L; Ioerger, TR; Sacchettini, JC; Zhang, YJ; Rubin, EJ; Pym, A; Khati, MDate:Nov 2013Bacterial cell wall components have been previously used as infection biomarkers detectable by antibodies. However, it is possible that the surface of the Mycobacterium tuberculosis (M. tb), the causative agent of tuberculosis (TB), also ...Read more
Author:Kebede, Mesfin A; Yannopoulos, SN; Sygellou, L; Ozoemena, KIDate:Oct 2017Oxygen-deficient pristine (LMNO) and microwave-treated LiMn1.5Ni0.5O4-d (LMNOmic) cathode materials have been synthesized with modified thermo-polymerization synthesis technique. The XRD, XPS, CV and charge/discharge voltage profile analysis ...Read more
Author:Melchior, SA; Raju, Kumar; Ike, IS; Erasmus, RM; Kabongo, G; Sigalas, L; Iyuke, SE; Ozoemena, KIDate:Feb 2018The energy storage performance of one of the lightest-known MXenes, Ti2CTx (MX) combined with carbon nanospheres (CNS) has been investigated as a symmetric electrode system in an aqueous electrolyte (1 M Li2SO4). The energy storage properties ...Read more