• Thermoluminescence of SrAl2O4:Eu2þ, Dy3þ: Kinetic analysis of a composite-peak 

  Wako, Ali Halake; Chithambo, M. L.; Finch, A. A. (Elsevier, 2016-12)

  The kinetic analysis of thermoluminescence of beta-irradiated SrAl2O4:Eu2þ,Dy3þ is reported. The glowcurve is dominated by an apparently-single peak. It has been demonstrated using a number of tests including partial ...
• Effect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+-doped yttrium aluminium garnet phosphor nanopowders 

  Wako, Ali Halake; Dejenea, F. B.; Swart, H. C. (John Wiley & Sons, 2016-03)

  ABSTRACT: The structural and optical properties of commercially obtained Y3Al5O12:Ce3+ phosphor were investigated by replacing Al3+ with Ga3+ and Y3+ with Gd3+ in the Y3Al5O12:Ce3+ structure to form Y3(Al,Ga)5O12:Ce3+ and ...
• A preliminary study of Thermoluminescence of beta-irradiated SrAl2O4:Eu2+, Dy3+ phosphors 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (2015)

  Eu2+ doped and Dy3+ co-doped strontium aluminate (SrAl2O4:Eu2+,Dy3+) phosphors were synthesized by the solution - combustion technique at 500 oC using urea as a reducer, a widely known method for preparing nano sized ...
• Characterization of cerium doped yttrium gadolinium aluminate garnet (Y-Gd)3Al5O12:Ce3+ phosphor thin films fabricated by pulsed laser deposition 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (2015)

  Thin films of cerium doped yttrium gadolinium aluminate garnet (Y-Gd)3Al5O12:Ce3+ (YGAG:Ce) were grown on Si(100) substrates by a pulsed laser deposition (PLD) technique using a 266 nm Nd:YAG pulsed laser under varying ...
• Influence of alkaline earth metal cations; Ca2+, Sr2+ and Ba2+ on the structural and optical properties of MAl2O4: Eu2+, Nd3+ phosphors. 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (2014)

  Eu2+ doped and Nd3+ co-doped MAl2O4:Eu2+, Nd3+ (M = Ca, Sr, and Ba) phosphors were prepared by a solution-combustion method. The obtained powders were investigated in terms of their phase composition, particle morphology ...
• Combustion synthesis, characterization and luminescence properties of barium aluminate phosphor 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2014-09)

  The blue-green emitting Eu2+ and Nd3+ doped polycrystalline barium aluminate (BaAl2O4:Eu2+,Nd3+) phosphor, was prepared by a solution-combustion method at 500 °C without a post-annealing process. The characteristic variation ...
• Properties of blue emitting CaAl2O4:Eu2+, Nd3+ phosphor by optimizing the amount of flux and fuel 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (Elsevier, 2014-04)

  Long afterglow CaAl2O4:0.03Eu2+, 0.03Nd3+ phosphor was prepared by solution-combustion synthesis. The active role of boric acid (H3BO3) as a flux in enhancing the Eu2+ photoluminescence and the effect of a varied amount ...
• Roles of doping ions in afterglow properties of blue CaAl2O4:Eu2+,Nd3+ phosphors 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (2014-04)

  Eu2+ doped and Nd3+ co-doped calcium aluminate (CaAl2O4:Eu2+,Nd3+) phosphor was prepared by a urea-nitrate solution combustion method at furnace temperatures as low as 500 °C. The produced CaAl2O4:Eu2+,Nd3+ powder was ...
• Structural and luminescence properties of SrAl2O4:Eu2+,Dy3+,Nd3+ phosphor thin films grown by pulsed laser deposition 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2015-09)

  Thin films of Eu2þ doped and Dy3þ,Nd3þ co-doped Strontium Aluminate (SrAl2O4:Eu2þ,Dy3þ,Nd3þ) phosphors were grown on Si(100) substrates by a pulsed laser deposition (PLD) technique using a 266 nm Nd:YAG pulsed laser under ...
• Structure,morphologyandopticalpropertiesofundopedand MN-doped ZnO(1 x)Sx nano-powderspreparedbyprecipitation method 

  Wako, Ali Halake; Dejene, F. B.; Onani, M. O .; Koao, L. F.; Motloung, S. V.; Yihunie, M. T. (Elsevier, 2015-08)

  The undopedandMn-dopedZnO(1 x)Sx nano-powders weresuccessfullysynthesizedbyprecipitation method withoutusinganycappingagent.Itsstructure,morphology,elementalanalysis,opticaland luminescence propertiesweredeterminedbysc ...
• Effect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+-doped yttrium aluminium garnet phosphor nanopowders 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (John Wiley & Sons, 2016-01)

  ABSTRACT: The structural and optical properties of commercially obtained Y3Al5O12:Ce3+ phosphor were investigated by replacing Al3+ with Ga3+ and Y3+ with Gd3+ in the Y3Al5O12:Ce3+ structure to form Y3(Al,Ga)5O12:Ce3+ and ...
• Trap characteristics of UV-activated Y3(Al,Ga)5O12:Ce3+phosphorsA 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2015-12)

  tThis paper reports on the trap characteristics of commercially obtained Y3(Al,Ga)5O12:Ce3+phosphorpowder. The effects of UV irradiation time and different heating rates have been discussed using differentthermoluminescence ...
• Anti-Bacterialactivities And Phytochemical Screening Of Extracts Of Different Parts Of Thalictrum Rhynchocarpum 

  Mayeku, Philip Wafula; Hassanali, Ahmed M.; Kiremire, Bernard T.; Odalo, Josiah O.; Hertweck, Christian (2013)

  Parts of the plant Thalictrum rhyncocarpum are used in herbal medicine in Kenya to treat various infections. The aim of this study was to evaluate in-vitro anti-bacteria activities and phytochemical profiles of solvent ...
• Thalictramine, A new alkaloid from Thalictrum rhyncocarpum (Dill & Rich) and its anti-bacterial activity 

  Mayeku, Philip Wafula; Odalo, J. O.; Hassanali, A.; Kiremire, B. T.; Hertweck, C. (2014)

  Thalictrum rhyncocarpum, a creeping plant with fern-like leaves, is used in herbal medicine to treat various infections in parts of Africa. Previously, we reported In-vitro anti-bacterial activity of different parts (root, ...
• Chemical composition and mosquito repellency of essential oil of Conyza newii propagated in different geographical locations of Kenya 

  Mayeku, Philip Wafula; Omollo, N. I.; Odalo, O. J.; Ahmed, Hassanali (John Wiley & Sons, 2014)

  Previously, essential oil of Conyza newii (Asterale: Asteracea, Oliv. & Hiern) growing in the northern part of West Pokot (35◦E, 1◦N) of Kenya was shown to be highly repellent [RD50 =8.9×10−5 mg/cm2, 95% confidence interval ...
• Phenolic and Monoterpenoid Mosquito Repellent Constituents of Headspace Vapors of Conyza newii 

  Mayeku, Philip Wafula; Sauda, Swaleh; Ahmed, Hassanali (2013-01)

  The plant Conyza newii has been reported to posses, mosquito repellent and fumigant toxicity properties. In this study headspace vapors emitted by the plant were obtained by adsorption on porapak Q® through headspace ...
• Pyrolysis Process Studies for Post Consumer Polyethene waste conversion and Upgrading of The Pyrolysis oil 

  Mburu, J. N.; Njogu, P. M.; Wachira, Jackson M. (2015)

  Pyrolysis is a waste to energy conversion technology that operates in oxygen free environments. Pyrolysis can be applied in the sustainable management of plastic wastes through conversion to liquid and gas fuels which are ...
• Beneficiation of Iron in Thermal-Reduced Ilmenite by Magnetic Separation 

  Wachira, Jackson M.; Kariuki, Warui S.; Peterson, Mutembei K.; Waithaka, Peter N. (2013)

  ncreasing demands for Iron in countries development, and lack of conventional reducing agents has resulted into sourcing of alternative ways of beneficiating the iron ore. This paper reports on the study that was done ...
• Concentration of Laterites Using Biomass 

  Wachira, Jackson M.; Muriithi, Naftali; Waithaka, Peter; Wanjau, Ruth (Kenya Industrial Property Institute, 2015-06-11)

  A method of concentrating iron in laterites to make the iron extraction process economical is disclosed. Concentration using biomass yields higher levels of iron by using appropriate ratio of biomass: laterites. The ...
• Cementing material from rice husk-broken bricks-spent bleaching earth-dried calcium carbide residue 

  Wachira, Jackson M.; Muthakia, Gerald K.; Thiong’o, Joseph K. (2012)

  A cementious material, coded CSBR (Carbide residue Spent bleaching earth Broken bricks and Rice husks), was made from dried calcium carbide residue (DCCR) and an incinerated mix of rice husks (RH), broken bricks (BB) and ...

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