Browsing by UP Author "Focke, Walter Wilhelm"

Browsing by UP Author "Focke, Walter Wilhelm"

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  • Kruger, Taneshka; Sibanda, Mthokozisi Mayibongwe; Focke, Walter Wilhelm; Bornman, Maria S. (Riana); De Jager, Christiaan (SpringerOpen Journal, 2015-12)
    BACKGROUND : South Africa uses indoor residual spraying (IRS) for vector control in its malaria control programme (MCP). Insecticide-treated wall linings (ITWLs) offer possible advantages over IRS and long-lasting, ...
  • Gnanasekaran, Dhorali; Massinga, Pedro Horacio; Focke, Walter Wilhelm (Nova Science Publishers, 2015)
    The paper presents a complete conspectus of ethylene-co-vinyl acetate (EVA) nanocomposites based on different types of nanostructured materials incorporated into EVA polymers. The three types of nanostructured materials, ...
  • Makgato, M.H. (Matlou Hector); Moitsheki, L.J.; Shoko, Lay; Kgobane, B.T. (Bethuel Lesole); Morgan, D.L.; Focke, Walter Wilhelm (Elsevier, 2009)
    Coal extraction experiments were conducted using a coal, containing ca. 10% ash, from the Tshikondeni mine in South Africa. This coal dissolves only to a limited extent in pure polar aprotic solvents such as dimethylformamide ...
  • Massinga, Pedro Horacio; Focke, Walter Wilhelm; De Vaal, Phillip L.; Atanasova, Maria T. (Elsevier, 2010-07)
    Organo-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated ...
  • Focke, Walter Wilhelm; Moyo, Lumbidzani; Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus); Hoosen, N.G.; Ramjee, Shatish; Saphiannikova, M. (Elsevier, 2014-02)
    Stearate intercalated layered double hydroxide was synthesized by reacting the corresponding carbonate form with a large excess of stearic acid. Thermal analysis, FTIR, XRD and SEMEDS characterization indicated the ...
  • Oberholster, Paul Johan; Musee, Ndeke; Botha, A-M; Chelule, P.K.; Focke, Walter Wilhelm; Ashton, Peter J. (Elsevier, 2011-03)
    Studies were conducted to determine the effects of a panel of seven nanomaterials (NMs), namely: a-alumina, g-alumina, precipitated silica; silica fume, calcined silica fume, colloidal antimony pentoxide (Sb2O5), and ...
  • Sibanda, Mthokozisi Mayibongwe; Focke, Walter Wilhelm; Braack, L.E.O.; Leuteritz, Andreas; Brünig, Harald; Tran, Nguyen Hoai An; Wieczorek, Florian; Trümper, Wolfgang (Elsevier, 2018-10)
    Core-sheath structured fibres were developed for application as part of an alternative malaria vector control intervention aimed at reducing outdoor malaria transmission. The fibres were prepared by melt spinning of high ...
  • Focke, Walter Wilhelm; Van der Westhuizen, Isbe; Oosthuysen, Xander (Elsevier, 2016-06)
    It is conventional to quantify the oxidative stability of oils and biodiesel through an induction time deter-mined by a Rancimat instrument. European Standard EN 14112 for the Rancimat method describes twoprocedures for ...
  • Govender, Desania R.; Focke, Walter Wilhelm; Tichapondwa, Shepherd Masimba; Cloete, William Edward (American Chemical Society, 2018-05)
    The energetics of cast calcium sulfate dihydrate–aluminum thermites were investigated. The casts were prepared from water slurries with a solids content below 65 wt %. The base case thermite comprised 60 wt % calcium sulfate ...
  • Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Del Fabbro, Olinto; Kelly, Cheryl (Wiley, 2015-08)
    Chemical time delay detonators are used to control blasting operations in mines and quarries. Slow burning Si-BaSO4 pyrotechnic delay compositions are employed for long time delays. However, soluble barium compounds may ...
  • Morekhure-Mphahlele, Refilwe; Focke, Walter Wilhelm; Grote, Wiebke (Acoustical Society of America, 2017-03)
    Two traditional cosmetic clays bear similar names in different local South African languages: vumba (Tshivenda) and ubumba (isiZulu). The wet clays are applied topically for cosmetic purposes by the respective indigenous ...
  • Focke, Walter Wilhelm; Badenhorst, Heinrich; Mhike, Washington; Kruger, Hermanus Joachim; Lombaard, Dewan (Elsevier, 2014-05)
    Thermal analysis and other techniques were employed to characterize two expandable graphite samples. The expansion onset temperatures of the expandable graphite’s were ca. 220 °C and 300 °C respectively. The key finding ...
  • Papole, Gedion; Focke, Walter Wilhelm; Manyala, Ncholu I. (Elsevier, 2012-08)
    Medium-temperature gasifier pitch (MTP) is only partly soluble in acetonitrile, methanol and ethanol. Single-stage pitch extraction with a large quantity of methanol yielded two liquid phases containing 76 wt. % and 27 ...
  • Atanasova, Maria T.; Vyalikh, Anastasia; Scheler, Ulrich; Focke, Walter Wilhelm (Elsevier, 2016-06)
    Three rectorite samples from the Beatrix Gold Mine, South Africa were characterized. Scanning electron microscopy revealed a layered morphology. High resolution transmission microscopy showed well distinguished light and ...
  • Muiambo, H.F. (Herminio Francisco); Focke, Walter Wilhelm; Atanasova, Maria T.; Benhamida, Aida (Elsevier, 2015-03)
    Replacing the exchangeable interlayer ions in Palabora vermiculite with magnesium, aluminumor iron (III) ions does not affect the exfoliation onset temperature (456± 11 °C). However, co-intercalation of minor amounts ...
  • Merckel, R.D. (Ryan David); Focke, Walter Wilhelm; Sibanda, Mthokozisi Mayibongwe; Massinga, Pedro Horacio; Crowther, N.A.S. (Nicolaas Andries Sadie), 1944- (Routledge, 2012-02)
    WHO-approved insecticides were co-intercalated with hexadecyl-trimethylammonium (HDTMA) chloride in bentonite in an attempt to improve their persistence. XRD and FTIR confirmed successful co-intercalation of the insecticides. ...
  • Badenhorst, Heinrich; Focke, Walter Wilhelm (Elsevier, 2013-11)
    Two unidentified powdered graphite samples, from a natural and a synthetic origin respectively, were examined. These materials are intended for use in nuclear applications, but have an unknown treatment history since ...
  • Tichapondwa, Shepherd Masimba; Focke, Walter Wilhelm; Gisby, John; Del Fabbro, Olinto; Kelly, Cheryl (Taylor and Francis, 2016-07)
    Slow burning Si-BaSO4 pyrotechnic delay compositions are employed commercially for intermediate to long time delays. However, there is very little information on this composition available in open literature. The reactivity ...
  • Joseph, Susan; Focke, Walter Wilhelm; Thomas, Sabu (Brill, 2010)
    The morphology of blends of poly(acrylonitrile-co-butadiene-co-styrene) (ABS) and poly(ethylene terephthalate glycol) (PET-G) has been investigated with special reference to the effect of blend ratio and compatibilization. ...
  • Kruger, Hermanus Joachim; Focke, Walter Wilhelm; Mhike, Washington; Taute, A.T. (Albertus); Roberson, Albert; Ofosu, Osei (Sage, 2014-06)
    Polyethylene was flame retarded with two intumescent-type additives, 3,5-diaminobenzoic acid phosphate and ethylenediamine phosphate, which differ with respect to their decomposition onset temperatures, along with varying ...