11-13 November 2019
Africa/Johannesburg timezone
SA-ESRF Light Source Conference
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Displaying 102 contributions out of 102
Type: Oral Session: Parallel-Paleo
Track: Paleo
The Iron-rich fossil-bearing rocks of South Africa have tempered the success of traditional lab-CT scanning protocols, with results often lacking sufficient resolution and density contrast required for detailed analysis of fossil material. Two dinosaur specimens, from opposite sides of the dinosaurian family tree, were recently scanned on the BM05 and ID-19 beamlines at the ESRF. The results produ ... More
Presented by Mr. Viktor RADERMACHER on 13 Nov 2019 at 09:45
Type: Oral Session: Strategy 1
Track: Strategy
Inspired by the rallying call of Science for Development, Science for Peace, and Science itself, a large cohort of Scientists and Policy Makers and others, from Africa and beyond, have identified the African Light Source as a priority. This large scale science research infrastructure is the leading example of a resource hosting multi/inter/trans- disciplinary research activities. These include the ... More
Presented by Prof. Simon CONNELL on 11 Nov 2019 at 12:15
Type: Oral Session: Strategy 1
Track: Strategy
New materials for the capture of light and mechanical energy can potentially enable low-cost and innovative renewable sources of energy while eliminating negative effects on the environment that are inherent when non-renewable sources of energy are utilised. Energy materials characterisation with synchrotron x-rays is a vital tool for the development of modern and next generation energy harvesting ... More
Presented by Dr. Marcus NEWTON on 11 Nov 2019 at 14:15
Type: Oral Session: Parallel-Bio
Track: BioScience
Plasmodium falciparum causes the most lethal form of malaria. The cooperation of heat shock protein (Hsp) 70 and 90 is important for the folding of a select number of cellular proteins that are crucial for cyto-protection and development of the parasites. Hsp70 and Hsp90 are brought into a functional complex that allows substrate exchange by stress-inducible protein 1 (STI1), also known as Hsp70-H ... More
Presented by Dr. Stanley MAKUMRE on 13 Nov 2019 at 12:15
Type: Oral Session: Plenary
Track: Plenary
Africa does not have a synchrotron, and while the establishment of a synchrotron light source on the African continent continues to be discussed, these initiatives get stalled by the lack of expertise on the African continent in successfully designing an experiment and analysing the large amount of data. In this contribution, I will highlight some collaborative projects between African researchers ... More
Presented by Dr. Mashikoane MOGODI on 12 Nov 2019 at 11:30
Type: Oral Session: Plenary
Track: Plenary
The highly brilliant X-ray beam at the ESRF allows application of sophisticated techniques for identification of the chemical state. High-resolution powder diffraction pushes the limits of solving and refining of crystal structures and investigating the structure of crystalline, defective and non-crystalline materials via atomic pair distribution function (PDF) analysis. X-ray spectroscopy provide ... More
Presented by Dr. Pieter GLATZEL on 12 Nov 2019 at 11:00
Session: Plenary
on 13 Nov 2019 at 12:40
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
Complimentary to using synchrotron light, neutrons as well as laboratory X-rays play invaluable instrumental roles in the study of materials and their characteristics. South Africa, through The South African Nuclear Energy Corporation (Necsa) SOC Limited, offers both neutron and X-ray diffraction capabilities to the scientific and industrial communities. Necsa's X-ray diffraction laboratory houses ... More
Presented by Dr. Deon MARAIS on 13 Nov 2019 at 12:15
Session: Strategy 1
The Floor and Panel come to Resolutions and Conclusions. Conclusions This SA-ESRF meeting builds on more than a decade long deep commitment to develop the User Base in Africa reflecting the Global nature of Science and the ESRF as a leading international facility. ESRF-EBS represents a very dramatic increase in figure of merit (FOM) of performance of both source and detector (100x100) or ab ... More
Presented by Prof. Simon CONNELL on 11 Nov 2019 at 15:25
Type: Poster Session: Poster Session 1
Track: Materials
The capture barrier energy of the E-center deep level defect induced in Pd/Sb-doped Ge by alpha-particle irradiation has been studied. Palladium Schottky barrier diodes (SBDs) fabricated by resistive evaporation technique were successfully characterised by current-voltage (I-V), capacitance-voltage (C-V), conventional and Laplace deep level transient spectroscopy (DLTS). The rectification quality ... More
Presented by Dr. Ezekiel OMOTOSO on 11 Nov 2019 at 17:00
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
The 1,2,3,5-dithiadiazolyl radicals (DTDAs), R-CNSSN•, are of considerable interest due to their potential as magnetic or conducting materials. However, DTDAs tend to dimerise in the solid state via an interaction known as pancake bonding.[1] Pancake bonding between DTDAs results in spin pairing, rendering the resulting materials diamagnetic. Overcoming this dimerization interaction has been the ... More
Presented by Prof. Delia HAYNES on 13 Nov 2019 at 11:50
Type: Poster Session: Poster Session 1
Track: Materials
Bismuth-oxide based electrolytes are well known for their high oxide ion conductivity at intermediate temperatures (300-700°C). Indeed, the defect fluorite structured δ-phase of Bi2O3 shows the highest known oxide ion conductivity of any material. Unfortunately, this phase is only stable above 730°C and much research has been carried out on stabilizing this phase to lower temperatures through s ... More
Presented by Mr. Masilo RAMAFEMO on 11 Nov 2019 at 17:00
Session: Plenary
Presented by Dr. Jean SUSINI on 12 Nov 2019 at 16:15
Type: Oral Session: Plenary
Track: Plenary
TBA
Presented by Dr. Francesco SETTE on 11 Nov 2019 at 10:30
Session: Plenary
Presented by Dr. Francesco SETTE
Type: Oral Session: Strategy 1
Track: Strategy
TBA
Presented by Dr. Francesco SETTE on 11 Nov 2019 at 11:45
Type: Poster Session: Poster Session 1
Track: Materials
Lithium ion batteries convert chemical energy into electrical energy and the process is reversible making them suitable for energy storage systems.(1) Having efficient and long term storage devices allows for increased use of sustainable energy sources. The cathode material remains the largest focus area for the improvement of the battery performance (2) and any structural changes of the cathode m ... More
Presented by Ms. Michelle THIEBAUT on 11 Nov 2019 at 17:00
Type: Poster Session: Poster Session 1
Track: Materials
NASICON-type materials such as rhombohedral LiTi2(PO4)3 (LTP), belonging to the R-3c space group, have been studied as potential solid-state electrolytes because of their thermal and chemical stability, as well high ionic diffusion attributed to their 3D framework consisting of TiO6 octahedra, corner-linked to PO4 tetrahedra, allowing for fast transportation of Li+ cations. [1] However, the room-t ... More
Presented by Ms. Gugulethu NKALA on 11 Nov 2019 at 17:00
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
Sirius is a fourth-generation synchrotron light source built at the CNPEM and is forecast to begin operations in 2020. Brazil is transitioning from a second-generation synchrotron source (UVX) to a leading position in the design and operation of the brightest 4th-generation machine in its energy class. This multidisciplinary research infrastructure will bring an advanced facility to the structural ... More
Presented by Dr. Dean BARRETT on 13 Nov 2019 at 11:50
Type: Oral Session: Parallel-Bio
Track: BioScience
The formation of high quality and perfect crystals forms the bottleneck and rate-limiting step for structure determination by X-ray crystallography. Protein crystallography has formed an intricate part of the chemical, biotechnology and pharmaceutical industry as an important tool towards drug design, protein engineering and in understanding various biological systems. In this study, a Universal s ... More
Presented by Prof. Abidemi Paul KAPPO on 13 Nov 2019 at 11:25
Type: Oral Session: Parallel-Paleo
Track: Paleo
The use of X-ray micro-computed tomography (microCT) in palaeontology, geology, biology and material science and engineering has significantly increased in the last decade. In palaeontology, microCT is now widely used as the best tool to visualise and analyse fossils, which are sometimes still embedded in rock. With the growing use of microCT, the need for high-quality scan data is essential to ob ... More
Presented by Ms. Muofhe TSHIBALANGANDA on 13 Nov 2019 at 09:25
Presented by Dr. Marcus NEWTON on 13 Nov 2019 at 11:00
Type: Oral Session: Strategy 1
Track: Plenary
Presented by Dr. Daniel ADAMS on 11 Nov 2019 at 12:45
Session: Strategy 1
Presented by Dr. Harald REICHERT, Dr. Jean SUSINI on 11 Nov 2019 at 16:00
Type: Oral Session: Strategy 1
Track: Plenary
We describe an initiative funded by a 3-year, 300K-Euro grant from the International Science Council (ISC) to the International Union of Pure and Applied Physics (IUPAP) and International Union of Crystallography (IUCr) in collaboration with over 30 partner organizations that include 16 advanced light sources to enhance the utilization of advanced light sources and crystallography in five targeted ... More
Presented by Prof. Simon CONNELL on 11 Nov 2019 at 14:45
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
The main consideration in this presentation is the interplay amongst magnetic-electronic, structural and charge-gap responses in strongly correlated 3d electron systems (transition metal oxides) evolved to very high static densities. Tuning through the large, ~eV, energy scales necessitate employing diamond anvil cells for requisite static pressures to the vicinity of ~100 GPa. Conseque ... More
Presented by Prof. Giovanni HEARNE on 13 Nov 2019 at 09:30
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
Semiconductors have been used in solar water splitting since the initial report on hydrogen production using TiO2. Thus far, materials explored to achieve theoretical solar to hydrogen efficiency (STH), included cadmium selenide (CdSe), zinc oxide (ZnO), copper(I)oxide (Cu2O), tungsten trioxide (WO3) and hematite (α-Fe2O3). All these failed due to their band edge alignments that do not straddle w ... More
Presented by Dr. Mmantsae DIALE on 13 Nov 2019 at 09:00
Type: Poster Session: Poster Session 1
Track: Materials
Diamond-like carbon (DLC) thin film is an amorphous carbon consisting of sp3 bonded and sp2 bonded carbon, and in addition contain up to several tens atomic percent of hydrogen. it can be used as protective anti –reflecting coatings for basic silicon solar cells to enhance the cell efficiency. On the other hand, it can be changed the opto-electronic and mechanical properties that depend on the ... More
Presented by Dr. wilfred MBIOMBI on 11 Nov 2019 at 17:00
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
X-ray diffraction and Raman spectroscopy techniques were used to investigate residual stresses in polycrystalline diamond disc samples sintered using the high temperature, high pressure method in the presence of a cobalt solvent/catalyst. The metallic phase primarily aids the formation of diamond to diamond bonds during sintering. During harsh rock drilling applications at elevated temperatures, t ... More
Presented by Mr. Maxwell VHARETA on 13 Nov 2019 at 12:15
Type: Oral Session: Parallel-Bio
Track: BioScience
MicroCT has tremendous potential to provide novel insights into plant form and function My research uses this and other, novel, non-invasive optical techniques to view the process of leaf and stem xylem embolism formation within intact plants to resolve long-standing questions in plant physiology. Here, I will highlight two recent experiments performed at the Australian Synchrotron in Melbourne Au ... More
Presented by Dr. Robert SKELTON on 13 Nov 2019 at 11:00
Session: Plenary
Presented by Dr. Daniel ADAMS, Dr. Clifford NXOMANI, Dr. Tshepo NTSOANE on 11 Nov 2019 at 10:00
Session: Plenary
Presented by Dr. Kudakwashe JAKATA on 12 Nov 2019 at 12:30
Type: Oral Session: Strategy 1
Track: Strategy
Synchrotron radiation has revolutionized basic and applied research in many fields of science and technology. South African, like many countries, has seen an ever increasing number of scientists accessing such facilities around the world. Despite spiralling cost and long distance travel, South African synchrotron usage has therefore increased steadily over the last decade. This talk aims to gi ... More
Presented by Dr. Tshepo NTSOANE on 11 Nov 2019 at 11:30
Type: Oral Session: Plenary
Track: Plenary
There is a strong competition for beam time at the ESRF. Access is based on submission of a Research Proposal. The proposal success rate averages 45%, but certain facilities are more in demand than others. Proposal are judged primarily on scientific merit. Technical feasibility, safety and ethics must also be assured. Although the EBS project has led to a service interruption, the proposal submiss ... More
Presented by Dr. Harald REICHERT on 12 Nov 2019 at 16:30
Type: Oral Session: Parallel-Chemistry and Materials
Track: BioScience
Abstract Relevance of Synchrotron Radiation in Inorganic Medicinal Chemistry ODULARU, Ayodele Temidayo1 Department of Chemistry, University of Fort Hare, Alice 5700, South Africa. Corresponding Author: 201106223@ufh.ac.za/ayodeleodularu@gmail.com This study entails how three synchrotron radiation spectroscopic techniques (infrared microspectroscopy, microphobe X-ray fluorescence imagi ... More
Presented by Dr. Ayodele Temidayo ODULARU on 13 Nov 2019 at 10:05
Presented by Fred MADA on 13 Nov 2019 at 10:00
Type: Oral Session: Plenary
Track: Materials
The lifespan and integrity of critical metal components such as steam turbine blades for the power generation industry can be limited and compromised by mechanisms such as fatigue and stress corrosion cracking. Conventional surface treatments such as shot peening and roller burnishing are commonly used to introduce beneficial compressive residual stresses to mitigate crack related phenomena. Laser ... More
Presented by Dr. Daniel GLASER on 12 Nov 2019 at 15:30
Session: Strategy 1
The Floor puts Questions and Comments to the Panel of seekers who gave talks in the session
Presented by Prof. Simon CONNELL on 11 Nov 2019 at 15:15
Type: Oral Session: Plenary
Track: Plenary
The discipline of structural biology has had a rocky start and chequered history in South Africa. Despite structural biology having transformed the life sciences over the last half century and the continued relevance being documented almost daily through novel revelations in the premier scientific journals such as Nature, Science, Proceedings of the National Academy of Sciences (USA), New Scientis ... More
Presented by Prof. Wolf-Dieter SCHUBERT on 12 Nov 2019 at 14:30
Type: Oral Session: Strategy 1
Track: Strategy
Effective use of Large Scale Research Infrastructures (LSRI) requires considerable local infrastructure to first be in place. In the case of a LSRI for analysis of samples or materials, a strong local capacity in acquisition and preparation of research material is required as well as an established excellence in the understanding of that material in the general research context. The proposers of e ... More
Presented by Dr. Tshepo NTSOANE, Prof. Bryan Trevor SEWELL on 11 Nov 2019 at 12:00
Session: Strategy 1
TBA
Presented by Dr. Tshepo NTSOANE
Session: Strategy 1
on 11 Nov 2019 at 14:00
Session: Poster Session 1
on 12 Nov 2019 at 17:00
Session: Plenary
on 12 Nov 2019 at 16:00
Type: Oral Session: Plenary
Track: Plenary
The ESRF’s facilities for Structural Biology comprise 6 end-stations for macromolecular crystallography (MX) 1, one end-station for BioSAXS experiments 2 and one end-station based around a Titan Krios cryo-electron microscope 3. These are supplemented by a number of support laboratories including the iCOS facility for in crystallo optical spectroscopy 4 and a facility for the high pressure cryo- ... More
Presented by Dr. Gordon LEONARD on 12 Nov 2019 at 14:00
Type: Poster Session: Poster Session 1
Track: Materials
TiC thin film has many industrial and scientific applications due to its favourable properties. In this study, TiC thin film was deposited on Ti6Al4V alloy substrate to improve the surface properties. Structural characterization of the evolving properties was carried out. Grazing incidence X-ray diffractometer GIXRD was used to determine the crystallographic structure of the film. Structural defec ... More
Presented by Mr. Olayinka Oluwatosin ABEGUNDE on 11 Nov 2019 at 17:00
Type: Oral Session: Parallel-Bio
Track: BioScience
Thandeka Moyo1,2, Cathrine Scheepers1, Prudence Kgagudi1, Rutendo Ziki1, Lynn Morris1, 2, 3, Penny L. Moore1, 2, 3 1National Institute for Communicable Diseases, Johannesburg, South Africa 2University of the Witwatersrand, Johannesburg, South Africa 3Centre for the AIDS Programme of Research in South Africa (CAPRISA), Durban, South Africa HIV broadly neutralizing antibody (bNAb) respon ... More
Presented by Dr. Thandeka MOYO on 13 Nov 2019 at 11:50
Type: Oral Session: Plenary
Track: Materials
Solid Oxide Fuel Cells (SOFCs) and Solid Oxide electrolyser cells (SOECs) are exciting electrochemical devices that could provide unique and revolutionary solutions to some of the renewable energy challenges facing society. Central to the design of these devices is the need for a solid electrolyte that is an excellent oxygen ionic conductor whilst simultaneously being and electronic insulator. Add ... More
Presented by Prof. David BILLING on 12 Nov 2019 at 10:00
Type: Poster Session: Poster Session 1
Track: Materials
The demand for electricity is rapidly growing in developing countries and electrochemical devices such as solid oxide fuel cells (SOFCs) have shown promising developments to mitigate the demand. SOFCs are devices that convert chemical fuels (such as CO, H2 and ethanol) directly into electrical energy and this process is more efficient than any combustion process. They reduce the dependence on coal ... More
Presented by Mr. Dennis MALIHASE on 11 Nov 2019 at 17:00
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
Solid oxide fuel cells (SOFCs) are electrochemical devices that convert chemical energy directly to electrical energy with reduced CO2, SO2 and NOx emissions [1]. They are highly efficient and when operated in combined heat and power mode they can reach efficiencies above 80% [2]. These devices have been known since Bauer and Preis reported their first use to produce electricity in 1937 [3]. Over ... More
Presented by Mr. Sikhumbuzo MASINA on 13 Nov 2019 at 09:45
Type: Oral Session: Parallel-Chemistry and Materials
Track: Materials
The world's future supply of crucial metals hinges on sound scientific research and geological discovery. To this end, researchers and industry experts apply a range of traditional techniques such as microscopy, whole-rock geochemistry, and field mapping (among others). However, the world's easily-discovered resources have been exhausted and new mineral discoveries are becoming more difficult to u ... More
Presented by Mr. Bjorn VON DER HEYDEN on 13 Nov 2019 at 09:00
Type: Poster Session: Poster Session 1
Track: Materials
The discovery of actuating materials, or materials that respond to external stimuli (light, heat, pressure etc.) has shed light on an entirely new area for exploration in the fields of crystal engineering and the chemistry of the solid state. Many of these actuating responses coincide with some sort of phase transformation or solid state reaction. Although the mechanisms of the transformations tha ... More
Presented by Ms. Thalia CARSTENS on 11 Nov 2019 at 17:00
Type: Oral Session: Plenary
Track: Plenary
The first application of X-ray synchrotron microtomography in palaeontology was performed in 2000 at the ESRF on the beamline ID19. This topic has been so successful that it has become one of the very visible research topics at the ESRF, making synchrotron microtomography the golden standard for non-destructive imaging of internal structure in fossils, when conventional microtomography reaches its ... More
Presented by Dr. Paul TAFFOREAU on 12 Nov 2019 at 12:00
Type: Oral Session: Strategy 1
Track: Plenary
The African Neutron and Synchrotron Data Analysis Competency (ANSDAC) project aims to develop expertise amongst emerging Africa-based faculty researchers to engage with and make use of large scale international institutions such as neutron and synchrotron light sources. It is funded by the Newton Fund administered by the Royal Academy of Engineering, and the DST-NRF Centre of Excellence in Catalys ... More
Presented by Dr. Hester DU PLESSIS on 11 Nov 2019 at 14:30
Type: Poster Session: Poster Session 1
Track: Materials
SOFCs have emerged as a leading candidate in the search for an efficient and environmentally friendly source of electrical energy.[1-7] SOFCs are, however, marred by a variety of limitations[1,4,6] which have prevented the widespread commercialization of this technology. Most of these limitations stem from the high operating temperature (typically 800-1000 °C) that is associated with these cells ... More
Presented by Mr. Mathias KIEFER on 11 Nov 2019 at 17:00
Type: Poster Session: Poster Session 1
Track: Materials
Hybrid-perovskite solar cells have shown rapid development over the last decade reaching 25.2% efficiency in 2019 [1]. Their commercialization is precluded by device stability. The use of mixed cations to substitute the A-site cation site in the prototypical MAPbX3 has shown to greatly improve stability, tune the bandgap and modify the microstructure of the photoactive layer towards a more optimal ... More
Presented by Adam SHNIER on 11 Nov 2019 at 17:00
Session: Strategy 1
Presented by Dr. Clifford NXOMANI on 11 Nov 2019 at 12:30
Type: Oral Session: Parallel-Paleo
Track: Paleo
Understanding the palaeobiodiversity of the Early Jurassic of South Africa relies on researchers’ ability to correctly identify the various fossil taxa from that time. Complicating factors such as ontogeny, sexual dimorphism, and taphonomic deformation often hinder these taxonomic identifications. Micro Computed Tomography (CT) allows for an unprecedented level of detail when studying fossils an ... More
Presented by Dr. Kimberley Etienne Justin CHAPELLE on 13 Nov 2019 at 10:05
Presented by Dr. Kudakwashe JAKATA on 13 Nov 2019 at 11:00
Type: Oral Session: Strategy 1
Track: Plenary
In recent years, there has been significant effort devoted to the formation of regional crystallographic associations in the developing world. During the International Year of Crystallography in 2014, an IUCr-UNESCO summit was held in South Africa. One of the outcomes of the summit was a declaration that envisaged the formation of an African Crystallographic Association, AfCA. This presentation wi ... More
Presented by Prof. Delia HAYNES on 11 Nov 2019 at 15:00
Type: Oral Session: Plenary
Track: Plenary
X-ray characterization provides opportunities for scientists in the exploration of materials and living matter in many fields: chemistry, material sciences, archaeology and cultural heritage, structural biology and medical applications, environmental sciences, information science and nanotechnologies. A wide range of techniques are available one of which is X-ray imaging. This term is usually asso ... More
Presented by Dr. julie VILLANOVA on 12 Nov 2019 at 09:00
Type: Oral Session: Parallel-Paleo
Track: Paleo
What is probably considered among the most influential paper about pre-mammalian palaeo-neurology states that "early cynodonts possessed low-resolution olfaction, poor vision, insensitive hearing, coarse tactile sensitivity, and unrefined motor coordination" (Rowe et al. 2011). This reflects the fact that the fossilized neuro-anatomy of mammalian ancestors has long been considered extremely conser ... More
Presented by Dr. Julien BENOIT on 13 Nov 2019 at 09:00
Type: Oral Session: Parallel-Chemistry and Materials
Track: Paleo
Necsa is privileged and in an unique situation within the South African context to host both neutron and X-ray radiography and tomography facilities on its premises at Pelindaba, 35 km West of Pretoria. True to the mission of Necsa to engage with stakeholders in the area of radiation sciences, international and national researchers and post graduate students are actively utilizing the imaging fa ... More
Presented by Dr. Frikkie DE BEER on 13 Nov 2019 at 11:25
Type: Oral Session: Plenary
Track: Plenary
Atomic structures can be determined using X-ray diffraction and this technique has already had a huge impact on a wide range of scientific disciplines. The upgrade of the ESRF source will bring another order of magnitude increase in the X-ray flux available for diffraction experiments in many beamlines. Detector upgrades are also planned in order to get the full benefit of these source improvement ... More
Presented by Dr. Jonathan WRIGHT on 12 Nov 2019 at 09:30