Browsing Engineering, Built Environment and Information Technology by UP Author "Focke, Walter Wilhelm"

Browsing Engineering, Built Environment and Information Technology by UP Author "Focke, Walter Wilhelm"

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  • Accelerated photo-oxidation of Polyamide 11 nanocomposites under various clays nanofillers 
    Dehouche, Nadjet; Kaci, Mustapha; Focke, Walter Wilhelm; Van der Merwe, Liezel (Wiley, 2022-08)
    The effect of various clays nanofillers on the photo-oxidation of polyamide 11 (PA11) has been investigated by accelerated ultraviolet (UV) test up to 780 h. Organo-modified montmorillonite, halloysite nanotubes, and ...
  • Acceptability and effectiveness of a monofilament, polyethylene insecticide-treated wall lining for malaria control after six months in dwellings in Vhembe District, Limpopo Province, South Africa 
    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, ...
  • Advanced eva nanocomposites : developments and new opportunities 
    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, ...
  • Aggregation and dissolution of aluminium oxide and copper oxide nanoparticles in natural aqueous matrixes 
    Nanja, Astone Frankline; Focke, Walter Wilhelm; Musee, Ndeke (Springer, 2020-06)
    Aggregation and dissolution kinetics of aluminium oxide nanoparticles (nAl2O3) and copper oxide nanoparticles (nCuO) in deionised water (DIW) and freshwater sourced from two river systems were studied with the objective ...
  • Al-Ni-NiO pyrotechnic time-delays 
    Guo, Shasha; Focke, Walter Wilhelm; Tichapondwa, Shepherd Masimba (Wiley, 2020-04)
    Please abstract in the article.
  • Alkali-assisted coal extraction with polar aprotic solvents 
    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 ...
  • Alkyl ammonium intercalation of Mozambican bentonite 
    Massinga, Pedro Horacio; Focke, Walter Wilhelm; De Vaal, Philip L.; Atanasova, Maria Todorova (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 ...
  • Anomalous shear viscosity-temperature behaviour of jojoba oil/LDH-stearate suspensions 
    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 ...
  • Bicomponent fibres for controlled release of volatile mosquito repellents 
    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 ...
  • Biodiesel oxidative stability from Rancimat data 
    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 ...
  • Blooming of chlorfenapyr from polyethylene films 
    Mapossa, António Benjamim; Moyo, Dennis Simbarashe; Wesley-Smith, James; Focke, Walter Wilhelm; Androsch, Rene (American Institute of Physics, 2020-11)
    FTIR, in ATR and in transmission modes, enabled the tracking of the migration of the insecticide Chlorfenapyr to the surface of a polymer film. It also allowed estimation of the apparent solubility in the polymer. However, ...
  • Blooming of insecticides from polyethylene mesh and film 
    Mapossa, António Benjamim; Sibanda, Mthokozisi Mayibongwe; Moyo, Dennis Simbarashe; Kruger, Taneshka; Focke, Walter Wilhelm; Androsch, Rene; Boldt, Regine; Wesley-Smith, James (Taylor and Francis, 2021)
    Malaria remains a public health concern with vector control still the vital component of disease prevention, control, and elimination strategies. Recent years has seen a “stalling” in the progress made towards the reduction ...
  • Breakdown mechanisms of oil-in-water emulsions stabilised with Pluronic F127 and co-surfactants 
    Kabong, M.A. (Mwamb); Focke, Walter Wilhelm; Du Toit, Elizabeth Louisa; Rolfes, Heidi; Ramjee, Shatish (Elsevier, 2020-01-20)
    Please read abstract in the article.
  • Burn rate of calcium sulfate dihydrate–aluminum thermites 
    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 ...
  • Calcium sulfate as a possible oxidant in “green” siliconbased pyrotechnic time delay compositions 
    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 ...
  • Cellulose acetate/organoclay nanocomposites as controlled release matrices for pest control applications 
    Mphateng, Thabang N.; Mapossa, António Benjamim; Wesley-Smith, James; Ramjee, Shatish; Focke, Walter Wilhelm (Springer, 2022-05)
    This study aimed to develop cellulose-based polymer matrices as controlled release devices for plant-based insect repellents and attractants, with the aim of finding sustainable and environmentally friendly pest control ...
  • Characterization of commercial expandable graphite fire retardants 
    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 ...
  • Characterization of medium-temperature Sasol-Lurgi gasifier coal tar pitch 
    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 ...
  • Characterization of rectorite from the Beatrix Gold Mine in South Africa 
    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 ...
  • Characterization of urea-modified Palabora vermiculite 
    Muiambo, Herminio Francisco; Focke, Walter Wilhelm; Atanasova, Maria Todorova; 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 ...