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Department of Physics: Recent submissions

Now showing items 41-60 of 90

First principles study of structural, electronic and mechanical properties of ternary Ru-Cr-X alloys

Mnisi, Bhila Oliver (2017-06)

We have investigated the effect of doping on the structural, electronic and mechanical properties of A15 RuCr3 and A15 Ru3Cr alloys using density functional theory. Various transition metal dopants, namely V, Mn, Fe, Co, ...
Doped vanadium dioxide by hydrothermal and green processes: synthesis and physical properties

Habtemariam, Asratemedhin Bekele (2018-07)

Nanomaterials are of great interest because of their novel electrical, optical and magnetic properties which results from their small size and shape and exhibit unique features that are significantly different from their ...
Atomistic simulations of competing influences on electron transport across metal nanocontacts

Dednam, Wynand (2019-06-14)

In our pursuit of ever smaller transistors, with greater computational throughput, many questions arise about how material properties change with size, and how these properties may be modelled more accurately. Metallic ...
Anisotropy in the magnetic interaction and lattice-orbital coupling of single crystal Ni3TeO6.

Ghosh, Anirudha; Chen, K H; Qiu, X S; Hsieh, Henry; Shao, Yang (Springer, 2018-10)

This investigation reports on anisotropy in the magnetic interaction, lattice-orbital coupling and degree of phonon softening in single crystal Ni3TeO6 (NTO) using temperature- and polarization-dependent X-ray absorption ...
Organic Matrix Stabilized Ultra‐Fine Bismuth Oxide Particles for Electrochemical Energy Storage Application

Devi, Nishu; Ghosh, Sarit Kumar; Ray, Sekhar C; Mallick, Kaushik (© 2018 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim, 2018-11)

The synthesis of an organic‐inorganic supramolecular hybrid system has been reported, using a wet‐chemical synthesis method, where the Bi2O3 nanoparticles are dispersed within the organic matrix. The XRD analysis showed ...
Radionuclide liquid waste treatment of 68[superscript]Ge by graphene oxide based nanomaterials

Genu, Aurelia Khanyiswa (2019-06)

Radionuclide liquid wastes generated from nuclear facilities can affect humans and the environment, thus substantial attention for their safe management has been received worldwide. Treatment of radionuclide liquid wastes ...
Theoretical and experimental analysis of biomass gasification processes using the attainable region theory

Muvhiiwa, Ralph Farai (2018-06)

There are limits on performance of processes and reactions set by material balances and by thermodynamics. The interaction of these theoretical limits and how they influence the behaviour of reactions and equipment is of ...
Synthesis of platinum group metals nanoparticles by gamma radiolysis

Cele, Takalani (2018-06)

An environmental friendly and simple approach to synthesis of Platinum (Pt), Palladium (Pd), Rhodium (Rh) and Osmium (Os) nanoparticles via gamma radiolysis is demonstrated. Herein, we report on the effect of gamma rays ...
Groundwater purification using functionalised magnetic nanoparticles (electromagnetic separation)

Aigbe, Uyiosa Osagie (2018-01)

Most developing countries are faced with drinking water problems, with conditions becoming more severe due to water pollution. Meeting the growing demands for clean water in most countries, there are difficult challenges ...
Laser-induced breakdown spectroscopy (LIBS) on geological samples : compositional differentiation and relative hardness quantification

Panya panya, Sipokazi Ntombifikile (2018-02)

This master’s thesis is focused on the LIBS technique for compositional differentiation and relative hardness quantification of selected geological samples. The experimental part of this thesis was conducted at the National ...
Study of Structural and Optical Properties of Undoped and Rare Earth Doped TiO2 Nanostructures

Talane, Tsholo Ernest (2017)

Un-doped, Er3+ doped (TiO2:Er3+) as well as Er3+/Yb3+ co-doped (TiO2:Er3+/Yb3+) nanocrystals with different concentrations of RE3+ (Er3+, Yb3+) were successfully synthesized using the sol-gel method. The powder X-ray ...
Boundary current response in Ba0.34K0.64Fe2As2 superconducting single crystal probed by non-resonant microwave absorption technique

Ramashitja, Tshiwela Caroline (2016-06)

Non-resonant microwave absorption (NRMA) in superconducting materials has become a new experimental technique to probe and understand superconducting materials. For example cuprate superconductors are well studied with ...
Structure and spin dynamics in Cr Doped ZnO

Amami, Paul Erhire (2016-06)

Polycrystalline Zn1-xCrxO (0.01 ≤ x ≤ 0.09) samples synthesized by solid state reaction technique were sintered at different temperatures following slow step sintering schedule. Structural, micro-structural, optical, ...
Photoluminescence Quenching and Enhanced Optical Conductivity of P3HT-Derived Ho3+-Doped ZnO Nanostructures

Kabongo, Guy L; Mbule, Pontsho S; Mhlongo, Gugu H; Mothudi, Bakang M; Hillie, Kenneth T; Dhlamini, Mokhotjwa S (2016-09-20)

Abstract In this article, we demonstrate the surface effect and optoelectronic properties of holmium (Ho3+)-doped ZnO in P3HT polymer nanocomposite. We incorporated ZnO:Ho3+ (0.5 mol% Ho) nanostructures in ...
Dynamics of the breakup of two-body halo nuclei

Mukeru, Bahati (2015-06)

In this thesis, the first-order and higher-order interferences on the total (Coulomb+nuclear), Coulomb and nuclear breakup cross sections in the 15C+208Pb, 11Be+208Pb breakup reactions are first studied at 68 MeV/u ...
Synthesis and characterization of long persistent phosphors using combustion method

Colen, Manaka Mmakgabo (2015)

In this work, alkaline earth aluminate phosphors doped with rare-earth ions and manganese were synthesized using combustion method. Several characterization techniques were used to study the structural and luminescent ...
Regulation of kinases by synthetic imidazoles, nucleotides and their deuterated analogues

Nkosi, Thokozani Clement (2015-02)

Deuteration is the replacement of a hydrogen atom by deuterium atom in a molecule. The replacement begins at the most acidic hydrogen in the molecule. In ATP, the deshielded hydrogen is C8-H which is the first replaced ...
On the use of optimized cubic spline atomic form factor potentials for band structure calculations in layered semiconductor structures

Mpshe, Kagiso (2015-03)

The emperical pseudopotential method in the large basis approach was used to calculate the electronic bandstructures of bulk semiconductor materials and layered semiconductor heterostructures. The crucial continuous ...
Non-resonant microwave absorption studies in SmFeAs(O,F) iron pnictide superconductor

Onyancha, Robert Birundu (2015-03)

As an electromagnetic response detection technique, non-resonant microwave absorption (NRMA) has been without doubt, one of the fundamental tools in characterizing high temperature superconductors (HTSC). The technique can ...
Thermodynamic approach to biogas production

Muvhiiwa, Ralph Farai (2015-02)

This dissertation determines theoretical targets for producing biogas. Calculations were based on the relationship between the mass of substrate used (assumed to be glucose) versus the amount and composition of gas produced. ...

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