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Browsing Journal Articles by Author "Maaza, M"

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Annealing effect on the structural and optical properties of Cr/ -Cr2O3 monodispersed particles based solar absorbers

Author: Khamlich, S ; McCrindle, R ; Nuru, ZY ; Cingo, N ; Maaza, M Date: Jan 2013 A cost-effective and environmentally friendly green chemical method, the so-called aqueous chemical growth (ACG) method, was used to deposit chromium/alpha-chromium(III) oxide, Cr/a-Cr2O3, monodispersed particles, for solar absorbers applications. ... Read more
Annealing effect on the structural and optical properties of Cr/a-Cr2O3 monodispersed particles based solar absorbers

Author: Khamlich, S ; McCrindle, R ; Nuru, ZY ; Cingo, N ; Maaza, M Date: Jan 2013 A cost-effective and environmentally friendly green chemical method, the so-called aqueous chemical growth (ACG) method, was used to deposit chromium/alpha-chromium(III) oxide, Cr/a-Cr2O3, monodispersed particles, for solar absorbers applications. ... Read more
Black Cr/a-Cr2O3 nanoparticles based solar absorbers

Author: Khamlich, S ; Nemraoui, O ; Mongwaketsi, N ; McCrindle, R ; Cingo, N ; Maaza, M Date: 2012 Monodisperse spherical core–shell particles of Cr/a-Cr2O3 with high adhesion were successfully coated on rough copper substrates by a simple self-assembly-like method for the use in solar thermal absorbers. The structure and morphology of the ... 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
The combination of low level laser therapy and efavirenz drastically reduces HIV infection in TZM-bl cells

Author: Lugongolo, Masixole Y ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Maaza, M ; Mthunzi-Kufa, Patience Date: Jun 2020 Human immunodeficiency virus (HIV) infection remains a global health challenge despite the use of antiretroviral therapy, which has led to a significant decline in the mortality rates. Owing to the unavailability of an effective treatment to ... Read more
The effects of low level laser therapy on both HIV-1 infected and uninfected TZM-bl cells

Author: Lugongolo, Masixole Y ; Manoto, Sello L ; Ombinda-Lemboumba, Saturnin ; Maaza, M ; Mthunzi-Kufa, Patience Date: Jan 2017 Human immunodeficiency virus (HIV-1) infection remains a major health problem despite the use of highly active antiretroviral therapy (HAART), which has greatly reduced mortality rates. Due to the unavailability of an effective vaccine and ... Read more
Electron spin resonance study of a-Cr2O3 and Cr2O3·nH2O quasi-spherical nanoparticles

Author: Khamlich, S ; Srinivasu, VV ; Nemraoui, O ; McCrindle, R ; Cingo, N ; Maaza, M Date: Dec 2011 The quasi-spherical nanoparticles of hydrated Cr2O3 · nH2O, and crystalline -Cr2O3, have been synthesized by reduction of the first row (3d) transition metal complex of K2Cr2O7. The temperaturedependence of electron spin resonance (ESR) ... Read more
Femtosecond laser surface structuring and oxidation of chromium thin coatings: black chromium.

Author: Kotsedi, L ; Nuru, ZY ; Mthunzi-Kufa, Patience ; Muller, TFG ; Eaton, SM ; Julies, B ; Manikandan, E ; Ramponi, R ; Maaza, M Date: Dec 2014 In view of their potential applications as selective solar absorbers, chromium coatings on float glass substrates were nano/micro structured by femtosecond laser in air. Raman and X-rays diffraction investigations confirmed the formation of ... Read more
Femtosecond laser surface structuring of molybdenum thin films

Author: Kotsedi, L ; Mthunzi-Kufa, Patience ; Nuru, ZY ; Eaton, SM ; Sechoghela, P ; Mongwaketsi, N ; Ramponi, R ; Maaza, M Date: Oct 2015 This contribution reports on the femtosecond surface structuring of molybdenum thin coatings deposited by electron beam evaporation onto Corning glass substrates. The 1-D type periodic grating lines created by such an ablation showed that the ... Read more
Fourier transform infrared spectroscopy for sepia melanin

Author: Mbonyiryivuze, A ; Mwakikunga, Bonex W ; Dhlamini, SM ; Maaza, M Date: Aug 2015 Melanin is of interest as a model system of understanding disorder in biological systems. The biological functionality of melanin depends on disorder which is considered as its essential part. This property distinguishes melanin from other ... Read more
From phonon confinement to phonon splitting in flat single nanostructures: A case of VO2@V2O5 core–shell nano-ribbons

Author: Mwakikunga, Bonex W ; Maaza, M ; Hillie, KT ; Arendse, CJ ; Malwela, T ; Sideras-Haddadf, E Date: Jul 2012 Raman spectroscopy of the VOx nano-ribbons is discussed in the framework of the Richter (1981) equation for optical phononconfinement (a) as modified for thin films by Fauchet and Campbell (1986), (b) as presented by Kim and co-workers for ... Read more
Influence of electrospinning parameters on the structural morphology and diameter of electrospun nanofibers

Author: Jacobs, V ; Anandjiwala, RD ; Maaza, M Date: Nov 2009 Electrospinning is a simple method of producing nanofibers by introducing electric field into the polymer solutions. We report an experimental investigation on the influence of processing parameters and solution properties on the structural ... Read more
Ionic self-assembly of porphyrin nanostructures on the surface of charge-altered track-etched membranes

Author: Mongwaketsi, N ; Ndungu, PG ; Nechaev, A ; Maaza, M ; Sparrow, R Date: Jan 2010 Track-etched polymer membranes are typically used as templates in the synthesis of various nanowires or nanotubes arrays. The unique advantages of track-etched membranes, such as uniform pore structure, excellent porosity, easily tailored ... Read more
Morphological and chemical composition characterization of commercial sepia melanin

Author: Mbonyiryivuze, A ; Nuru, ZY ; Ngom, BD ; Mwakikunga, Bonex W ; Dhlamini, SM ; Park, E ; Maaza, M Date: Jun 2015 Melanins are difficult to characterize because of their intractable chemical properties and the heterogeneity in their structural features. Melanin pigments, in fact, are composed of many different types of monomeric units that are connected ... Read more
Nanoporous copper-cobalt mixed oxide nanorod bundles as high performance pseudocapacitive electrodes

Author: Nwanya, AC ; Awada, C ; Obi, D ; Raju, Kumar ; Ozoemena, Kenneth I ; Osuji, RU ; Ruediger, A ; Maaza, M ; Rosei, F ; Ezema, FI Date: Feb 2017 We used a simple, cost effective and scalable chemical method to deposit mixed oxides of copper and cobalt on indium tin oxide (ITO) and stainless steel (ss) substrates. The deposited mixed oxides of Cu-Co and Co-Cu exhibit uniform surface ... Read more
Nonlinear optical properties of natural laccaic acid dye studied using Z-scan technique

Author: Zongo, S ; Sanusi, K ; Britton, J ; Mthunzi-Kufa, Patience ; Nyokong, T ; Maaza, M ; Sahraoui, B Date: Aug 2015 We have investigated the nonlinear optical properties, including the optical limiting behaviour for five different concentrations of laccaic acid dye in solution and a thin film obtained through doping in poly (methyl methacrylate) (PMMA) ... Read more
Nonlinear optical properties of poly(methyl methacrylate) thin films doped with Bixa Orellana dye

Author: Zongo, S ; Kerasidou, AP ; Sone, B ; Diallo, A ; Mthunzi-Kufa, Patience ; Iliopoulos, K ; Nkosi, M ; Maaza, M ; Sahraoui, B Date: Jun 2015 Natural dyes with highly delocalized p-electron systems are considered as promising organic materials for nonlinear optical applications. Among these dyes, Bixa Orellana dye with extended p-electron delocalization is one of the most attractive ... Read more
On the remarkable nonlinear optical properties of natural tomato lycopene

Author: Numan, N ; Jeyaram, S ; Kaviyarasu, K ; Neethling, P ; Sackey, J ; Kotsedi, CL ; Akbari, M ; Morad, R ; Mthunzi-Kufa, Patience ; Sahraoui, B ; Maaza, M Date: May 2022 In line with the renewed interest in developing novel Non Linear Optical (NLO) materials, natural Lycopene’s NLO Properties are reported for the first time within the scientific literature. Correlated to its 1-D conjugated p-electrons linear ... Read more
One-Dimensional Vanadium Dioxide nanostructures for room temperature hydrogen sensors

Author: Simo, A ; Mwakikunga, Bonex W ; Maaza, M Date: Jun 2015 In relation to hydrogen (H2) economy in general and gas sensing in particular, an extensive set of one dimensional (1-D) nano-scaled oxide materials are being investigated as ideal candidates for potential gas sensing applications. This is ... Read more
Optimization of electrospinning parameters for chitosan nanofibres

Author: Jacobs, V ; Patnaik, A ; Anandjiwala, RD ; Maaza, M Date: Jun 2011 Electrospinning of chitosan, a naturally occurring polysaccharide biopolymer, has been investigated. In this paper, the authors report the optimization of electrospinning process and solution parameters using factorial design approach to ... Read more

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