Article in Press
This research work presented the preparation of pure–undoped TiO2 and 0.5 wt.% Ni-doped nanoparticles through Sol-gel method using titanium tetra isopropoxide as titanium source and nickel nitrate hexahydrate as nickel source. The prepared samples were calcined at 450, 500, 550, 600, 700 and 800oC and analyzed for energy band gap, surface area, particle size morphology and purity using UV-Vis DRS, BET, SEM and EDX...
Modeling of firewood acacia auriculifomis drying kinetics
Article in Press
The purpose of this work is to identify a mathematical model of the drying kinetics of acacia Auriculiformis wood. The study focused on the phenomenon of heat and mass transfer of this wood in an indirect solar dryer already designed, with the influence of external parameters such as convection, sunshine, temperature, as well as humidity. middle. These are identified from measurements taken in the laboratory.
Article in Press
Synthesis of aluminum doped zinc cobalt ferrite with composition of AlxZn1-xCoFe2O4 (0.00?x?1.00) was done by sol gel method and calcined at 650?. The structural, morphological, and quantitative analysis of the elements was done. The structural properties were studied by the X-Ray Diffractometer (XRD) which revealed that the crystal size was 2.115nm, it also revealed the spinel nature of the synthesized ferrite. The...
Article in Press
This paper presents the effect of feed composition, xF, and feed thermal conditions on the benzene-toluene distillation plant performance. An interactive computer model was developed to simulate the process using vapor–liquid equilibrium (VLE) data, mass and energy balances and McCabe-Thiele method. The feed thermal conditions studied were vaporized feed (VF), feed at its boiling point (FBP) and subcooled liquid (SCL)...
Article in Press
A sulphate solution of cobalt (18.93 g/L Co2+) containing major impurities such as copper (1.35 g/L Cu2+) , iron (0.28 g/L Fetot), zinc (0.70 g/L Zn2+) and manganese (4.83 g/L Mn2+) was purified through the solvent extraction method using two extractants; MEXTRAL and D2EHPA for the removal of copper and for the removal in two stages of a zinc-iron-manganese complex respectively. The effects of the solution’s pH, the O/A...
Article in Press
Powdered Grewia spp. barks was extracted in water and one part of the extract was precipitated with absolute ethanol. Both the crude water extract and the ethanol precipitate was freeze dried, pulverized into powder and subjected to physicochemical analyses. Amongst others: proximate composition, morphology and metal contents by SEM-EDX, functional group by FTIR, crystallinity by XRD, thermal behavior via DSC and TGA. The...
Article in Press
This paper presents a computer model results for investigation of the effect of pressure in the last effect (Pv3) on the performance of triple-effect evaporator (TEE). The model was designed to address steady state conditions. The study covered forward feed evaporation mode, with wide range of evaporator capacity (500-10,000 kg/h). The temperature of steam was varied between 100 and 400 kPa-g while the pressure in the...
Morphological and Mechanical Characterizations of Neuropeltis acuminatas (NA) Fibers
Article in Press
His present work aims to determine the morphological and mechanical characteristics of fibers from a Cameroon liana locally called "Ndik Kussa" scientific name Neuropeltis acuminatas (NA). The vines are cut in a forest of southern CAMEROON in NGALANE by EBOLOWA. The fibers are extracted by us using the traditional method used to make the kussa. SEM micrographs of the cross section of the fiber are made and tensile tests on...
Article in Press
By means of polarization measurements, UV and IR study it has been detected that the extract of Withania Somnifera, Glycyrrhiza Glabra and Tinospora Cardifolia leaves can act as corrosion inhibitor for the sake of mild steel in 3.5% NaCl. These plants show good inhibition efficiency at particular concentrations of the NaCl. It is observed that plant extracts act as better inhibitor on increasing their concentration. Here...
Article in Press
Liquid-liquid extraction columns scale up and design requires accurately prediction of overall mass transfer coefficient Koc. Already many methods have been suggested by investigators to predict this coefficient. One of these methods is substitution of effective diffusion coefficient (Deff = RD) instead of diffusion coefficient (D) in Newman equation. We surveyed some correlations suggested for R, and compared their...
THE EFFECT OF PPG/PCL POLYOLS MIXTURE ON PROPERTIES OF BIODEGRADABLE POLYURETHANE FOAM
Article in Press
Polyurethane foams (PUF) are synthesized by polyaddition polymerization of difunctional isocyanates and multifunctional alcohols (polyols). The PUF properties are primarily depended on raw materials. In this study, the properties of PUF synthesized from aromatic diisocyanate were compared with PUF synthesized from aliphatic diisocyanate. The effects of molar ratios between hydrophilic (PPG) and hydrophobic (PCL) polyols...
Effect of γ'' and γ' Precipitates on the Properties of Cu-Be Alloy
Article in Press
The effects of γ'' and γ' precipitates on the properties of the Cu-Be alloy have been investigated by many researchers. The hardness changes measurements and differential scanning calorimetry (DSC) dilatation analysis were used in this study to investigate the effect of the precipitated phases for the cold rolled and non-deformed specimens during isothermal and low heating rate aging of 2℃/min. Through an isothermal...
Article in Press
Pollution of the aquatic environment by heavy metals has detrimental effects on living species. In this work, Nano-composite Adsorbents were developed using agricultural waste (i.e. Palm Kernel shell, Coconut shell and Bamboo stem). These agro-wastes were collected, dried separately and repeatedly crushed to a Nano-size. The characterization of these adsorbents were done separately using SEM and Zetasizer machines. The...
PRODUCTION OF BIOGAS FROM CO-DIGESTION OF COW DUNG, SAW DUST AND MAIZE HUSK
Article in Press
The co – digestion of cow dung, with maize husk for biogas production at laboratory scale was investigated. The study was carried out at a temperature range of 24 oC – 30 °C and pH range of 5.5 – 6.5 for a period of 60 days with a total solid concentration of 7.4% in the digester sample (fermentation slurry). Water displacement method was used to collect the biogas produced which was subsequently measured. 444.8 mL...
MECHANICAL PROPERTIES OF NATURAL RUBBER FILLED WITH CHEMICALLY TREATED GROUNDNUT SHELL FILLER
Article in Press
Physico-Mechanical properties of natural rubber filled with chemically modified Groundnut shells were studied. Natural rubber composites were prepared using modified fillers at varying concentrations of sodium hydroxide (NaOH) Solution and acetylating solutions respectively. The proceability conditions, mechanical properties and sorption characteristics of these composites were analyzed. The cure characteristics of the...
Study of the diffusion behavior of water vapor sorption in natural fiber: Rhecktophyllum camerunense
Article in Press
The present work focuses on the study of the water absorption phenomenon in Rhecktophyllum camerunense (RC). Indeed the diffusive behavior of RC natural fiber was investigated. The fibers samples of 0.1g were submitted to hygro-thermal ageing in an environmental enclosure of 23%, 54% and 75% relative humidities at 23°C. Periodic gravimetric measurements were achieved on the specimens in order to follow their kinetics...
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