ABSTRACT Investigations were carried out to determine the corrosion effect of sulphur-reducing bacteria on mild and medium carbon steels. Specimens were exposed to anaerobic, aerobic and distilled water environments. The corrosion rates were evaluated at intervals of seven days using weight loss and electro-chemical methods for a period of forty two days. The specimens were also subjected to visual examination and the result indicated uniform corrosion in all the environments. In all the env...
ABSTRACT Over the last two decades, several materials such as metals, polymers and composites have been used as implants in the body. Metallic implants have proven to cause stress shielding, toxic corrosion products and necessity for re-surgery. On the other hand, synthetic polymers possess poor stiffness and cause inflammation. The quest in making up for the disadvantages of these materials has culminated in a paradigm shift to the use of biodegradable and biocompatible polymers such as pol...
ABSTRACT Environmental pollution by non-biodegradable plastics, gradual reduction and increase in cost of petroleum products used have affected lives over the years. With people using different kinds of packaging, it has a part of human daily living. Therefore, it is very important to find lasting and sustainable ways of producing and managing the wastes generated by these plastics. In this work, starch based biocomposites are fabricated and characterised to access its opportunities to repla...
ABSTRACT Oil spills have been a major source of concern due its harmful effect on the environment. To reduce the effect of oil spills, new remediation strategies need to be developed whiles enhancing the efficiency of existing remediation ones. In this study, the potential of TiO2 and its modified form (Fe-TiO2) as a stand-alone or as an add-on remediation strategy was explored. This was carried out by accessing the how TiO2 and Fe-TiO2 photodegrades crude oil fractions (aromatics, paraffins,...
ABSTRACT Analytical and finite element models were used to simulate additive cold welding patterning processes. The effects of adhesion, pressure, thin film (layer) thickness and dust particle modulus (between the contacting surfaces) are examined. A simple model is developed and used to determine the contact profiles around impurities between cold-welded thin films. These are computed as a function of adhesion, particle modulus, and layer thickness. The models are shown to provide new insig...
ABSTRACT The number one killer disease in the world is Cardiovascular Disease1 . The most serious element of Cardiovascular Disease is Coronary Artery Disease. Currently, the main treatment for Coronary Artery Disease is stent placement surgery. However, its long time safety and efficiency are the major setbacks, as it is associated with late restenosis and late thrombosis. These are set caused by the durable polymeric film used as the drug carrier. To improve on the current treatment (stent...
ABSTRACT Binders are important components of electrodes of supercapacitors because of their ability to adhere active components and make the resultant slurry to adhere on current collectors. This work seeks to investigate the possibility of a bioactive polymer (chitosan) substituting the conventional fluoro-thermoplastic binders used in supercapacitors within the constraint of electrochemical characterizations. Chitosan based electrodes at 3% acetic acid concentration displayed the best elec...
ABSTRACT Carbon dioxide (CO2) corrosion, also known as sweet corrosion of steels has increased in recent years due to the injection of CO2 into oil wells in order to increase oil recovery and production. Despite the fact that carbon steel has a low corrosion resistance, it is widely used in the petroleum industry due to its economic advantage. It has been reported that when ferrous steels are exposed to a corrosive medium, they form a protective surface film which helps to decrease the rate ...
Abstract Most countries in Africa are faced with difficult challenges in terms of providing safe, clean drinking water for their citizens. The world Health organization estimates that approximately 500 lives are lost per day in Nigeria from water related diseases while globally, 1.1 billion lack access to improve water supplies. Point-Of-use water treatment technologies, such as household ceramic water filters, offer an affordable and effective means of treating water to standards suitable f...
ABSTRACT This work studied the effects of degrees of warm-split rolling at different temperatures on the strengths of three different grades of austenitic steels (chrome–manganese, chrome–manganese with Ni and Mo additions, chrome–nickel with Mn and Mo additions). The results were compared with cold-rolling effects on the steel grades. The tensile, hardness and impact strengths of the rolled products were obtained. The results showed that thermomechanical working remarkably influenced t...
ABSTRACT Working properties of some clay deposits in Ekiti State, Nigeria were investigated with a view to determine their suitability for use as refractory bricks. The samples were collected from three different commercial pottery clay centers in Ekiti State; they are Ara, Awo and Isan. Two varieties were collected from both Ara and Isan, which are named Ara 1, Ara 2, and Isan 1, Isan 2 respectively while only one type was collected from Awo. The clay samples were crushed, pulverized, sieve...
ABSTRACT This study reports an investigation of the effect of carburizing variables - temperature, time and percentage of energizer --on the case properties of C2R steel obtained from HMT Ltd. India. A carburizer consisting of hardwood charcoal and coke respectively in the ratio of 2: 1 was used for the research with sodium carbonate as the energizer. The carburizing box was filled with 20 mm thick carburizer compound prior to fixing the steel samples in place. The specimens were carburized ...
ABSTRACT The dissolution response of y phase to thermal and mechanical effects in an inertia friction welded turbine disk nickel base super alloy RR1000 has been investigated.
ABSTRACT The study focuses on the influence of aluminium titanium boron (A5TB) master alloy on the fatigue behaviour of 6063al alloy.
ABSTRACT Organic dye pollutants are sometimes released into the environment with wastewater from industries which make use of such dyes. In surface water, they contaminate the surrounding environment while their residue accumulates on land. These chemicals are noted for their toxicity to living organisms and they can cause cancers in human beings. In this study a relatively simple, long term and cost effective remedy for dye pollution reduction was developed; with a focus on the use of semico...