Abstract This dissertation presents an overview of the research work with the above caption. This research is divided into five major sections or parts. Part one deals with interfacial adhesion studies of the layers relevant to organic light-emitting diodes (OLEDs).The adhesion interactions, that is, force and energy between different interfaces of the adjacent layers relevant to the OLED structure used in this work are analyzed together with their implication(s) on the device performance. I...
ABSTRACT Patients living with sickle cell disease are perpetually plagued with painful crisis episodes, caused by vascular occlusion. Over time, this leads to oxygen deprivation and the eventual damage of starved tissues and organs. Observations stemming from mechanical characterization of both diseased and healthy red blood cells (RBC), establish that shape and mechanical properties of human red blood cells are essential in maintaining normal functionality of these cells. From a molecular b...
ABSTRACT The study area which is the Niger Delta Province is predominantly an unconsolidated sandstone terrain, the sand grains are friable suggesting the expectation of some geomechanical problems while developing hydrocarbon reserves in such terrain. In this study, the geomechanical property used to measure rock strength (i.e. unconfined compressive strength) was evaluated by using three principal methods. Critical drawdown pressure (CDP) and sand production rate were also evaluated. First...
ABSTRACT AlSb is a semiconductor material which exist in 3D as well as 2D regimes. AlSb have a high electron mobility which is useful for application in high speed electronic devices. AlSb has potential applications in radiation detection. Defects, including intrinsic and extrinsic have been shown to influence the performance of AlSb for applications in electronic and optoelectronics. In this thesis, density functional theory with the aid of the generalised gradient approximation was use to m...
ABSTRACT Niger Delta Province is predominantly a friable, unconsolidated sandstone terrain suggesting the expectation of sand production while developing hydrocarbon reserves in such terrain. In this study, a simple and easy-to-use mechanistic model for predicting sand production rate (SPR) in Niger-Delta wells was developed by coupling the static sanding criteria and the dynamic requirement for fluidization of the produced sand. A generic mechanistic model that incorporates the concept of d...
ABSTRACT Recently, there has been a drift of attention towards gel polymer based electrolytes owing to the fact that they are cheap and can achieve an extended potential window for improved energy density in supercapacitor devices when compared to aqueous electrolytes. Thus in this regard, the electrochemical characterization of symmetric supercapacitor devices based on different polyethylene oxide (PEO) based gel electrolytes was studied. The gel polymer electrolyte is based on methanol sol...
ABSTRACT This paper presents the effect of polymer concentration on the release of fungicidal antimicrobial (AM) agent to prolonging the shelf life of packaged food. This project aimed to produce and test AM films with varying polymer ratio to control the release of fungicidal AM agent. The effects of potassium sorbate (PS) released on peanut and fresh breads was tested for nineteen days to determine the effect of AM agent to inhibit the growth of Aspergillus niger (A. niger). The microbe wa...
ABSTRACT The concept of dumpflooding is to flow water from a high pressure aquifer zone to a low pressure oil producing zone by natural force of gravity through a well connecting the two zones to enhance oil sweep into a producing well. The research described is aimed to find solutions to one of the flaws in dumpflooding that is, the inability to quantify the rate of water injection from a high pressure aquifer zone to a low pressure oil producing zone. Theoretical dumpflood equations were d...
Abstract This research work presents the results of analytical studies of effects of pressure and adhesion energy on the interfacial properties of cold welded and laminated surfaces in organic and Hybrid Organic/Inorganic electronic structures. The analytical modeling is based on the physics of elastic behaviour of a cantilever beam. The energy balance approach was employed to model the surface contacts in Hybrid Organic/Inorganic structures, HOISOLs, and Organic Light Emitting Diodes, OLEDs...
ABSTRACT New equations for bilinear, formation linear and pseudo-radial flow regimes in an infinite commingled fractured multilayered reservoir have been developed. The equations have been extended to Tiab’s Direct Synthesis Technique that makes it easy to estimate the individual layer properties without type curve matching. Regardless of the flow regime, the rate normalized pressure derivative with respect to the appropriate time function has been found analytically to be constant, which ...
ABSTRACT The increasing rate of cancer patients worldwide, and especially Africa has led to numerous efforts to battle it. One approach to this has been localized drug delivery to reduce the quantity of drugs needed for therapeutic effect. Poly-di-methyl-siloxane (PDMS) is an elastomer with much focus on it as a microfluidic device. PDMS is one polymer of choice for localized drug delivery due to its biocompatibility, transparency, and ease of fabrication. However, its highly hydrophobic nat...
ABSTRACT Increasing oil recovery has been one of the issues enlisted for attention in oil producing countries around the world for past decades. So many forms of oil recovery techniques have been considered; infill drilling of new wells, production and injection control, pressure control, water flooding and other methods of Enhanced Oil Recovery (EOR), most of which have been implemented in other parts of the world. Nigeria as an oil producing country has not taken interest in EOR techniques ...
ABSTRACT The use of horizontal wells with zonal isolations is a common completion practice in the oil and gas industry to check for very significant production challenges such as wellbore damage/skin, early water breakthrough and gas coning, rapid pressure depletion, dampened recovery efficiency and overall well productivity. Notwithstanding, the use of zonal isolators invariably alters the transient pressure response of horizontal wells. In this research, the use of well test analysis has b...
Abstract This work presents the results of experimental and theoretical studies of the biodegradation of polyethylene, recycling of polyethylene into strong and tough earth-based composite building materials and the statistical distribution and particle size analysis of the polyethylene composites. Serratia marcescens subsp. marcescens and its supernatants are able to biodegrade linear low density polyethylene (LLDPE). The results show that the cell-free extracts degrade LLDPE faster than th...
ABSTRACT A major drawback of directional and horizontal well drilling is the numerous complex computations required to be done while planning a well. These computations are very stressful and time consuming especially when done manually. One of the objectives of this study was to develop a user friendly Excel Spreadsheet program that would make the computations of these well trajectory parameters easier, faster and accurate. An Excel Spreadsheet program was developed employing the Minimum Cu...