Isaac Nkrumah

• Doctor of Philosophy
• Professor (Associate) at Kwame Nkrumah University of Science and Technology

Zeolite types LTZ and LSX were synthesized from bauxite and kaolin in Ghana and characterized by x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy and Fouries transformed infrared spectroscopy. The zeolites were then applied to used lubricant oil and parameters lubricant engine oil were measured and compared to t...

The use of adsorption in Thermal Energy Storage has gained considerable research interest of late. Some applications have focused on the use of TES for transformation of low temperature heat in applications such as cooling and heating. Zeolite and water have been studied as suitable materials. Their characteristics as environmentally friendly mater...

Pure and manganese doped zinc oxide nanoparticles have been successfully synthesized over the composition range, Zn1-xMnxO (0<x<0.5), by a solution growth process. The effect of Mn doping on the structure, morphology and optical properties were investigated by several techniques. X-Ray diffraction studies confirmed the formation of a single-phase p...

A study has been carried out to investigate the effect of the concentration of Sn in the metallic precursor on the structure, morphology, optical and electrical properties of PbSnS thin films. The films were directly electrodeposited on ITO-coated glass substrates using a 3-electrode electrochemical cell having graphite as the counter electrode and...

A study has been carried out to investigate the influence of the amount of Sn in the precursor solution, on some physical properties of CZTS films grown by sulfurization of electrodeposited metallic precursors. The growth of the CZTS samples was achieved by sequential electrodepositon of constituent metallic layers on ITO glass substrates using a 3...

CTS thin films have been prepared by soft annealing and sulfurization of electrodeposited Cu-Sn precursors. The stacked elemental layer approach was used to deposit the elemental precursors on an ITO substrate using a two-electrode electrochemical cell, with graphite plate as the counter electrode. The stacked metallic layer was then soft annealed...

Two kaolinitic clays from two Regions of Ghana: Western and Volta Regions, were first calcined at 600 °C for 2 h to transform into the amorphous aluminosilicate phases. The effects of kaolin and alkali ratio as well as aging on the amount and types of zeolite in the resultant geopolymers were characterized by X-ray diffraction, scanning electron mi...

The effect of annealing on the structural and optical properties of lead selenide and cadmium selenide thin films prepared by chemical bath deposition has been studied. The films were annealed in air for a duration of 1 hour at temperatures of 673 K for CdSe and 573 K for PbSe. Both the as-deposited and annealed films were characterized by X-ray di...

Zeolites based on the numerous applications can be utilised in providing solutions to some challenges of our world. With the ability to store thermal energy as chemical potential, zeolites are able to store thermal energy for long periods. This can occur with very minimal loss of energy and indefinitely unless the zeolite comes into contact with an...

Pyrite phase FeS2 thin films have been grown by a two-stage process of chemical bath deposition followed by sulfurization. Thiourea and thioacetamide were used as sulfur precursors in separate baths. The deposition time was controlled for 1, 2, and 3 hours respectively. The as-deposited films were sulfurized at temperatures of 250 oC and 500 oC to...

Ground water samples from residential homes in three Regions of Ghana: Central, Greater Accra and Ashanti, were analyzed for iron and manganese contamination. The samples were exposed to characterized zeolite Y by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transformed-infrared spectroscopy and the...

Bauxite and kaolin from Ghana Bauxite Company mine site were used to synthesize zeolites. Bauxite served as the alumina source and kaolin the silica source. Synthesis variations include variation of aging time at constant crystallization time and variation of crystallization times at constant aging time. Characterization techniques such as X-ray di...

Well adherent nanocrystalline cadmium sulphide thin films have been successfully deposited from acidic chemical baths by employing tartaric acid and hydrazine as complexing agents for the first time. The pH of the bath was about 2.35 and the depositions were carried out at bath temperatures of 60 °C and 70 °C. The films were characterized by a vari...

This article reports the synthesis of Polyaniline (PANI) in Emeraldine form by in situ chemical oxidation method by using Ammonium persulphate as an oxidizing agent and a simultaneous synthesis of polyaniline (PANI)/SnO2nanocomposites. The UV-Vis absorption spectra were studied to explore the optical behavior after incorporating SnO2nanoparticles i...

This paper reports the experimental attempt toward deposition of Polyaniline (PANI) using electrochemical deposition technique to study the optical absorption of PANI thin films deposited at different pH values of aniline solution. The optical absorption measurements were carried out in order to estimate the energy band gap of the electrodeposited...

Nanocrystalline zinc sulphide (ZnS) thin films have been successfully deposited on silica glass substrates from acidic chemical baths containing tartaric acid and hydrazine as complexing agents, thioacetamide as a sulphur source and zinc acetate as the source of zinc ions. The influence of temperature on the structural-, optical-, morphological pro...

Zeolite X was synthesized in the laboratory and was characterized using X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, energy dispersive X-ray spectrometer, and Fourier transformed infrared spectrometry. Desalination activity of zeolite X was investigated by the ion-exchange process. The pH of the seawater prior to des...

Thin films of PdCdS ternary compound have been successfully deposited using chemical baths containing cadmium acetate, lead acetate thiourea and ammonia. The films were characterised using a variety of techniques. X-ray diffraction analysis revealed that a number of prominent high intensity diffraction peaks originating from reflections of the tetr...

The removal performance of arsenic was investigated by adsorption process on Linde Type X (LTX), Low–Silica Type X and Linde Type A (LTA) zeolites. The zeolites were hydrothermally synthesized in the laboratory at 100 ± 1 oC. The synthesized zeolites were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-Transfor...

Ammonium ion adsorption by laboratory-synthesized zeolite (linde type A; LTA) was investigated in batch kinetics experiments. Synthesized zeolite LTA was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy and particle size analys...

ZnO thin films have been deposited on silica glass substrate using the chemical bath deposition technique. The precursors used were zinc chloride and aqueous ammonia. The solution was stirred continuously with the help of a magnetic stirrer at a bath temperature of 70 oC and a deposition time of 70 minutes. The elemental composition and the surface...