Author:Land, KJ; Mbanjwa, M; Korvink, JGDate:Sep 2014We present a novel use for channel structures in microfluidic devices, whereby two two-phase emulsions, one created on-chip, the other off-chip, are rapidly mixed with each other in order to allow for the coalescence of one emulsion with the ...Read more
Author:Potgieter, S; Land, K; Kotze, L; Sparrow, RDate:2010Microfluidics is a multi-disciplinary field that deals with the behaviour, control and manipulation of fluids constrained to sub-millilitre volumes. It is proving to be a useful tool for biological studies, affording advantages such as reduced ...Read more
Author:Popoola, API; Ochonogor, OF; Abdulwahab, M; Pityana, Sisa L; Meacock, CDate:Dec 2012Surface modification of titanium alloy (Ti-6Al-4V) was made using a Rofin Sinar 4 kW Nd: YAG laser. A laser multi-track 50% overlapping process was employed to produce Zr and Zr-TiC metal matrix composite (MMC) coatings on Ti6Al4V substrate. ...Read more
Author:Labuschagne, Philip W; Naicker, B; Kalombo, LonjiDate:Feb 2016The purpose of this investigation was to determine whether shellac, a naturally occurring material with enteric properties, could be processed in supercritical CO2 (sc-CO2) using the particles from gas saturated solution (PGSS) process and ...Read more
Author:Moshokoa, Nthabiseng; Raganya, Mampai L; Obadele, BA; Machaka, Ronald; Makhatha, MEDate:Oct 2020β-type titanium alloys are acquiring research interest in orthopaedic applications because of their exceptional properties such as moderate strength, good biocompatibility and corrosion resistance, high ductility and low elastic modulus. The ...Read more
Author:Kabongo, GL; Mhlongo, Gugu H; Malwela, T; Mothudi, BM; Hillie, KT; Dhlamini, MSDate:Apr 2014Un-doped and Tb(Sup3+) doped ZnO nanocrystals with different concentrations of Tb(Sup3+) were synthesized by a sol–gel method and their photoluminescence (PL) properties were investigated. The successful incorporation of Tb(sup3+) ions with ...Read more
Author:Adesina, OS; Popoola, API; Pityana, Sisa L; Oloruntoba, DTDate:Nov 2017The enhancement of the tribological properties of titanium (Ti-6Al-4V) has been the subject of wide range research over the years. The constraints associated with Ti-6Al-4V in severe tribological conditions due of its low hardness and poor ...Read more
Author:Olakanmi, EO; Sepako, M; Morake, J; Hoosain, Shaik E; Pityana, Sisa LDate:Dec 2018This study examines the dependence of microstructural characteristics, crack frequency and diffusion kinetics of functionally graded (FGM) titanium aluminide coatings reinforced with TiC on laser energy density (LED). Samples deposited on a ...Read more
Author:Booysen, TN; Jamiru, T; Adegbola, T; Arthur, Nana KKDate:Nov 2023Three-dimensional printing (3D), also known as metal additive manufacturing (MAM), fabricates parts or components from different feedstocks: wires, powders or sheets. This process differs from traditional manufacturing techniques such as ...Read more
Author:Okoro, OM; Machaka, Ronald; Lephuthing, SS; Awotunde, MA; Olubambi, PADate:Nov 2021In this study, the role of multiwall carbon nanotubes (MWCNT) on the microstructural evolution and mechanical properties of Ti6Al4V-based composites was investigated. This was conducted by dispersing different concentrations (0.5, 1.0 and 1.5 ...Read more
Author:Adebiyi, DI; Popoola, API; Pityana, Sisa LDate:Sep 2014Multiple track laser alloying is characterised by additional heat treatment and differences in the amount of powder deposited at the overlap regions. These result in different microstructural and phase evolution at these regions, which are ...Read more
Author:Tlotleng, MonnammeDate:Feb 2019This study reports on the microstructure, phase identification and hardness property of the LENS-manufactured binary Ti-Al alloy which was achieved via laser in situ alloying. The in situ alloying method, using laser beam as an energy source, ...Read more
Author:Arthur, Nana KK; Siyasiya, C; Pityana, Sisa L; Tlotleng, MonnammeDate:May 2021Alloy development opens the way to create new materials for specialized processes, and attain materials that are usually difficult to acquire. Property enhancements and part performance is achievable in an exciting new way when this technique ...Read more
Author:Malatji, N; Lengopeng, T; Pityana, Sisa L; Popoola, APDate:Feb 2021AlCrFeNiCuWx high entropy alloys were fabricated on 316 L stainless steel substrate using laser metal deposition technique. The microstructural and mechanical characteristics of these alloys were studied by advanced characterization techniques. ...Read more
Author:Aramide, B; Sadiku, R; Popoola, P; Pityana, Sisa L; Jamiru, TDate:May 2022The upgrade of the anti-wear property of steel base-plate for soil-working tools was done by depositing chromium–vanadium carbide deposits in situ via powder imbuement of FeCrV15 powder through laser cladding. The created specimens were exposed ...Read more
Author:Moshokoa, Nthabiseng A; Raganya, Mampai L; Machaka, Ronald; Obadele, BA; Mamookho, MEDate:Nov 2022The current study investigates the influence Mo on the microstructure and bending properties of solution treated Ti-xMo alloys (x= 10.00, 12.89, and 15.05 wt%). The fundamental objective of the study is to attain the correlation between the ...Read more
Author:Arthur, Nana KK; Pityana, Sisa LDate:Oct 2018Cylindrical components of dimensions 15 mm in diameter and 11 mm in height were laser printed by additive manufacturing using a LENS!™ system. Process parameters used in layer by layer build-ups showed that energy densities in the range of ...Read more
Author:Masina, Bathusile N; Lengopeng, Thabo; Pityana, Sisa L; Tlotleng, MonnammeDate:Nov 2017In this study, TiAl alloy was coated on Ti64 using a 1074nm high power continuous-wave laser while varying the laser beam scanning speed. This was done in order to increase the thermo-mechanical properties of Ti64. Scanning electron microscopy ...Read more