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Papers by Williams Osei
Journal of Chemical Technology & Biotechnology, 2015
ABSTRACT Background The synthesis and application of novel Zinc micro/nanostructures are of incre... more ABSTRACT Background The synthesis and application of novel Zinc micro/nanostructures are of increasing importance in modern nanotechnology.ResultsIn this paper we report the large scale synthesis of zinc oxide micro-flowers (ZnOMFs) using precipitation assisted by Cinnamomum camphora leaf extract (C. camphora) at relatively low temperatures ≤ 80 °C. The results showed that the ZnOMFs consisted of several nanoplates connecting together in the presence of the leaf extract which acted as a modifying, capping and stabilizing agent. X-ray diffraction, scanning and transmission electron microscopy (SEM and TEM), energy dispersed X-ray and photoluminescence studies were used to characterize and verify the nature of the ZnOMFs. Varying the leaf extract amount (5 to 20 mL) fine-tuned the morphology of the as-formed zinc oxide microstructures (ZnOMS). The as-formed ZnOMFs showed high photocatalytic activity for the degradation of methyl orange dye under ultraviolet (UV) irradiation, achieving 100% degradation after 45 min of reaction.Conclusion The use of leaf extract as a bio-template and capping agent provided an effective, cheaper and more environmentally benign way of controlling and directing the shape of as-formed ZnO microstructure.
International Journal of Scientific and Research Publications (IJSRP), 2022
Title: Implementing Change In Organisations: A Study on Limiting Factors for Managers in the Serv... more Title: Implementing Change In Organisations: A Study on Limiting Factors for Managers in the Service industry. Purpose: The overall purpose of this study is to have a deeper understanding of how change affects employees and an organisation and what are the factors could hinder such a change. This study will draw on the theory of Change Management, in particular, the model of Prosci ADKAR. Methodology: This research is carried out through a deductive approach. The study will adopt a qualitative approach using 11 semi-structured interviews and observations in a case study “HRS”. Theory: The study is based on theories within Change Management and focusing on the Prosci ADKAR model as the main theoretical tool. Empirical data: The empirical data will be collected through observation and semi-structured interviews with open-ended questions with managers and employees in the Customer Service Department of HRS. Conclusions: Our findings show that it is a necessity for any organisation befo...
Chinese Journal of Chemical Engineering, 2015
Journal of Chemical Technology & Biotechnology, 2015
ABSTRACT Background The synthesis and application of novel Zinc micro/nanostructures are of incre... more ABSTRACT Background The synthesis and application of novel Zinc micro/nanostructures are of increasing importance in modern nanotechnology.ResultsIn this paper we report the large scale synthesis of zinc oxide micro-flowers (ZnOMFs) using precipitation assisted by Cinnamomum camphora leaf extract (C. camphora) at relatively low temperatures ≤ 80 °C. The results showed that the ZnOMFs consisted of several nanoplates connecting together in the presence of the leaf extract which acted as a modifying, capping and stabilizing agent. X-ray diffraction, scanning and transmission electron microscopy (SEM and TEM), energy dispersed X-ray and photoluminescence studies were used to characterize and verify the nature of the ZnOMFs. Varying the leaf extract amount (5 to 20 mL) fine-tuned the morphology of the as-formed zinc oxide microstructures (ZnOMS). The as-formed ZnOMFs showed high photocatalytic activity for the degradation of methyl orange dye under ultraviolet (UV) irradiation, achieving 100% degradation after 45 min of reaction.Conclusion The use of leaf extract as a bio-template and capping agent provided an effective, cheaper and more environmentally benign way of controlling and directing the shape of as-formed ZnO microstructure.
International Journal of Scientific and Research Publications (IJSRP), 2022
Title: Implementing Change In Organisations: A Study on Limiting Factors for Managers in the Serv... more Title: Implementing Change In Organisations: A Study on Limiting Factors for Managers in the Service industry. Purpose: The overall purpose of this study is to have a deeper understanding of how change affects employees and an organisation and what are the factors could hinder such a change. This study will draw on the theory of Change Management, in particular, the model of Prosci ADKAR. Methodology: This research is carried out through a deductive approach. The study will adopt a qualitative approach using 11 semi-structured interviews and observations in a case study “HRS”. Theory: The study is based on theories within Change Management and focusing on the Prosci ADKAR model as the main theoretical tool. Empirical data: The empirical data will be collected through observation and semi-structured interviews with open-ended questions with managers and employees in the Customer Service Department of HRS. Conclusions: Our findings show that it is a necessity for any organisation befo...
Chinese Journal of Chemical Engineering, 2015