Browsing Chemistry by Title
Now showing items 26-45 of 74
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EFFECT OF COOKING METHODS AND DURATION ON ASCORBIC ACID CONCENTRATION OF SELECTED VEGETABLES
(RJLBPCS, 2020-12-01)Cooking vegetables before they are consumed helps in making them more palatable in addition to improving taste and texture. On the other hand, cooking causes a substantial change in the composition of chemicals thus ... -
Effect of Human Activities and Seasonal Variation on Water Quality of Nkenye (Chikuu) Stream in Chuka, Kenya
(2013-01)Composite water and sediment samples were taken from Nkenye stream at five different sampling stations during wet and dry seasons. Water quality parameters were analyzed using standard methods to ascertain ... -
Effect of the Y element on the structural, electronic and magnetic properties of Heusler compounds Co2YIn (Y = V, Nb, and Ti): An ab initio study
(AIP Advances, 2021-01-06)We report the effect of varying the Y element on the structural, electronic and magnetic properties of Co2YIn (Y = V, Nb, Ti) Heusler compounds using Density Functional Theory (DFT). The effect of the lattice parameter and ... -
Enhancement of the photo degradation of N-nitrosodimethylamine in water using amorphous and platinum manganese oxide catalysts
(ELSEVIER, 2011-01-25)The enhancement of the photodegradation of toxic N-nitrosodimethylamine (NDMA) in water using amorphous manganese oxide (AMO) and platinum manganese oxide (Pt/Mn3O4) catalysts was investigated. Characterization of the ... -
Facile one-step template-free synthesis of uniform hollow microstructures of cryptomelane-type manganese oxide K-OMS-2
(2010-08)Hollow microstructures of cryptomelane-type manganese oxide were produced in a template-free one-step process based on the fine-tuning of the oxidation rate of manganese species during the synthesis. The tuning of the ... -
Food Rheology using Dynamic Mechanical Analysis; A short review
(Paul Kamweru, 2020-02)An ideal elastic material will deform finitely and recover its original shape and size upon the removal of the applied deforming load. On the other hand an ideal fluid will deform and continue to deform as long as the ... -
Gas-phase total oxidation of benzene, toluene, ethylbenzene, xylenes using manganese oxides and copper manganese oxide catalysts.
(American Chemical Society, 2012-05-17)Volatile organic compounds (VOCs) continue to be the major source of direct and indirect air pollution. Here, cryptomelane-type octahedral molecular sieve (OMS-2) manganese oxide, amorphous manganese oxide (AMO), and mixed ... -
Generating, Rectifying and Stepping Up the Voltage Output of Piezoelectric Plate
(International Journal of Research Publications, 2020)Energy is required in all sectors that either supports or improves human life. However, some of the methods of power generation e.g. the fossils fuels are non-renewable and have byproducts that harms the environment. For ... -
Geochemical and Mineralogical Characteristics of Geophagic Materials from Kiambu, Kenya
(2012)Geophagia is the deliberate consumption of soil and clay. The practice of geophagia is due to reasons of culture, medicinal, religious and mineral deficiency. Geophagy is widespread among pregnant and ... -
Geochemical and Mineralogical Characteristics of Geophagic Materials from Kiambu, Kenya
(Modern Scientific Press Company, Florida, USA, 2012-09)Geophagia is the deliberate consumption of soil and clay. The practice of geophagia is due to reasons of culture, medicinal, religious and mineral deficiency. Geophagy is widespread among pregnant and ... -
H2 production through the water-gas shift reaction: An in situ time-resolved x-ray diffraction investigation of manganese OMS-2 catalyst
(Science Direct, 2010-10-25)Manganese oxide octahedral molecular sieve (OMS-2) catalyst prepared by the reflux method was investigated for hydrogen generation via the water-gas shift reaction. Catalysts were characterized using X-ray diffraction ... -
High-yield selective conversion of carbohydrates to methyl levulinate using mesoporous sulfated titania-based catalysts
(2015-01)Mesoporous sulfated-metal oxides and mixed-metal oxides prepared by a facile coprecipitation method employing titanium oxysulfate–sulfuric acid complex as a precursor of both titanium and sulfate are highly active and ... -
Hydrophobic polymer-coated metal oxide catalysts for effective low-temperature oxidation of CO under moisture-rich conditions
(American Chemical Society, 2010-05-04)The first example of a highly water-tolerant, hydrophobic polymer coated metal oxide catalyst systems is reported for CO oxidation. Studies show that protected catalysts have 5.3 times longer lifetimes than unprotected ... -
Indigenous knowledge and applications of clay among rural communities in western Kenya
(2019-01)A survey was conducted in Western Kenya involving 281 respondents to ascertain the clay applications and its health effects on human beings. Household survey, focus group discussions and direct observation were ... -
Investigation Of Physicochemical and Bacteriological Characteristics Of Water Samples From Irigu River Meru South, Kenya
(2012-11)Physicochemical and bacteriological parameter levels of river Irigu were investigated during wet and dry season in order to assess the degree of pollution .The results obtained were compared with WHO standards for drinking ... -
Light-assisted synthesis of metal oxide heirarchical structures and their catalytic applications
(American Chemical Society, 2011-02-18)Short reaction times and morphology control in the synthesis of inorganic materials under nonthermal conditions remain a challenge. Herein we report a rapid, self-templating, and nonthermal method based on ultraviolet light ... -
Livestock farmers perceptions on the relevance of natural licks in Igambang’ombe Division, Tharaka-Nithi County, Kenya
(2014-05)A survey covering 12 Sublocations in Igambang’ombe Divsion and involving 72 respondents was conducted to ascertain perceptions on the relevance of natural licks. Household survey, focus group discussions and direct ... -
Nonthermal synthesis of three-dimensional metal oxide structures under continuous-flow conditions and their catalytic applications
(American Chemical Society, 2011-10-25)Continuous-flow synthesis of one-dimensional (1D) metal oxide nanostructures and/or their integration into hierarchical structures under nonthermal conditions is still a challenge. In this work, a nonthermal, continuous-flow ... -
Optical and scanning kelvin probe microscopic characterization of sol-gel synthesized aluminum doped zinc cobalt ferrite nanoparticles
(academic Journals, 2020)In this work, Zn1-xCoFe2AlxO4 (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) ferrites were synthesized using the sol-gel method. XRD analysis was done and confirmed the formation of spinel structure, where the particle size and lattice ... -
Physico-Chemical Analysis of Ground Water from Kihara Division, Kiambu County, Kenya
(2012)Water quality is an index of health and is one of the areas of major concern to environmentalists, since industrialization, urbanization and modern agricultural practices have a direct impact on the water resources. Borehole ...