BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Synchrotron light and ore geology research DTSTART;VALUE=DATE-TIME:20191113T070000Z DTEND;VALUE=DATE-TIME:20191113T073000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2107@events.saip.org.za DESCRIPTION:Speakers: Bjorn von der Heyden (Stellenbosch University)\nThe world's future supply of crucial metals hinges on sound scientific researc h and geological discovery. To this end\, researchers and industry experts apply a range of traditional techniques such as microscopy\, whole-rock g eochemistry\, and field mapping (among others). However\, the world's easi ly-discovered resources have been exhausted and new mineral discoveries ar e becoming more difficult to uncover. Geoscientists must thus apply increa singly specialised and novel study techniques towards locating and optimal ly exploiting future resources.\n\nSynchrotron techniques represent one ap proach that can advance this ultimate goal. Already\, several research gro ups have applied synchrotron techniques towards understanding the micromet er and submicrometer scale mineral associations between ore minerals and t he host rock (i.e.\, using synchrotron XRF). Similarly\, the complexation and solubility of crucial metals within geological fluids are now better u nderstood through insight obtained using synchrotron XANES and EXAFS analy ses. These techniques further advance our understanding of trace metal coo rdination within mineral structures (e.g.\, gold in pyrite\, silver in gal ena\, germanium in zinc).\n\nFor southern African researchers to remain at the forefront of the global trends in geological research\, it is crucial that they become familiarised and indeed\, start to employ these high lev el synchrotron techniques towards their research questions. The current co ntribution critically reviews the global trends in synchrotron use for ore geology research. Key findings\, and anticipated future directions will b e highlighted during the seminar.\n\nhttps://events.saip.org.za/event/173/ contributions/2107/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2107/ END:VEVENT BEGIN:VEVENT SUMMARY:Magnetic-electronic studies at a megabar: the new frontier DTSTART;VALUE=DATE-TIME:20191113T073000Z DTEND;VALUE=DATE-TIME:20191113T080000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2108@events.saip.org.za DESCRIPTION:Speakers: Giovanni Hearne (University of Johannesburg)\nThe ma in consideration in this presentation is the interplay amongst magnetic-el ectronic\, structural and charge-gap responses in strongly correlated 3d electron systems (transition metal oxides) evolved to very high stati c densities. Tuning through the large\, ~eV\, energy scales necessitate employing diamond anvil cells for requisite static pressures to the vicini ty of ~100 GPa.\n Consequently pertinent onsite-repulsion to bandwidth U/ W and crystal-field splitting to spin-pairing energy CF/J ratios can be va ried over large ranges. Profound effects on physical properties may ensue \, including the breakdown of Hund’s rule resulting in a high-spin (HS) to low-spin (LS) transition (CF/J > 1) and a Mott insulator-metal transiti on (U/W <1). \n Variable temperature 57-Fe nuclear resonance (Mössbauer) spectroscopy extended to cryogenic temperatures\, is one of the few and m ost powerful means of revealing the magnetic-electronic ground-state sta bilized at high densities. Synchrotron XRD monitoring of the pressure evo lution of the unit-cell volume provides evidence of crystallographic phase transitions or corroborating evidence of HS to LS transitions\, from sign ature shrinkage effects in the cation radius due to spin pairing in lower lying 3d orbitals. \n Complementary resistance pressure measurements hel p to ascertain whether magnetic collapse is associated with HS to LS cross over or correlation gap closure (insulator to metal transition) or the con currence of the two phenomena.\n Highlights from a selection of studies\ , which include synchrotron XRD and nuclear resonance probes\, on various ferrous spinels pressurized to the vicinity of ~100 GPa will be presented [1-3]. These include\, as a result of compression: (i) orbital moment qu enching effects\, (ii) site-inversion at room temperature and subsequent s pin crossover occurring\, (iii) transitions to post-spinel structures and subsequent triggering of partial/site-specific spin crossover\, (iv) charg e-gap resilience in spite of anticipated appreciable bandwidth broadening and an attempt to rationalize this. \n We will further indicate why pr obing magnetic-electronic and structural aspects of these transition metal oxides beyond ~100 GPa would be useful\, is beyond home laboratory based capabilities and that synchrotron probing with appropriately tightly focus ed probes of micron or sub-micron dimensions is imperative. \n\nReference s\n\n[1] W. M. Xu\, G. R. Hearne\, S. Layek\, et al.\, Phys. Rev. B 95\, 0 45110 (2017).\n[2] W. M. Xu\, G. R. Hearne\, S. Layek\, \, et al.\, Phys. Rev. B 96\, 045108 (2017).\n[3] W. M. Xu\, G. R. Hearne\, S. Layek\, et al .\, Phys. Rev. B 97\, 085120 (2018).\n\nhttps://events.saip.org.za/event/1 73/contributions/2108/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2108/ END:VEVENT BEGIN:VEVENT SUMMARY:Materials preparation for the future hydrogen economy: PEC water s plitting DTSTART;VALUE=DATE-TIME:20191113T070000Z DTEND;VALUE=DATE-TIME:20191113T072500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2114@events.saip.org.za DESCRIPTION:Speakers: Mmantsae Diale (University of Pretoria)\nSemiconduct ors have been used in solar water splitting since the initial report on hy drogen production using TiO2. Thus far\, materials explored to achieve the oretical solar to hydrogen efficiency (STH)\, included cadmium selenide (C dSe)\, zinc oxide (ZnO)\, copper(I)oxide (Cu2O)\, tungsten trioxide (WO3) and hematite (α-Fe2O3). All these failed due to their band edge alignment s that do not straddle water oxidation and reduction potentials. Of these materials\, hematite has received much attention for photoelectrochemical water splitting attributed to its stability in aqueous solution\, a small band gap of 1.90 eV-2.20 eV\, non-toxicity and abundance. However\, it has associated limitations such as high electron-hole recombination rate\, sh ort hole diffusion length (2-4 nm) accompanied by short excited lifetime o f 10 ps\, and poor minority charge carrier mobility of 0.1 cm2 V-1s-1\, l eading to low photocurrent during water splitting. Furthermore\, hematite promises a maximum theoretical STH efficiency of ~16.8 %\, with photocurre nt densities above 12 mAcm-2\, but the reported findings are far below 10 mAcm-2. The future is in the hydrogen economy which requires clean energy production to reduce the carbon foot print and consequently combat climate change.\n\nhttps://events.saip.org.za/event/173/contributions/2114/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2114/ END:VEVENT BEGIN:VEVENT SUMMARY:Micro-Raman and X-ray Diffraction stress analysis of residual stre sses in fatigue loaded leached Polycrystalline Diamond DTSTART;VALUE=DATE-TIME:20191113T101500Z DTEND;VALUE=DATE-TIME:20191113T104000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2116@events.saip.org.za DESCRIPTION:Speakers: Maxwell Vhareta (DST/NRF Centre of Excellence in Str ong Materials\, University of the Witwatersrand)\nX-ray diffraction and Ra man 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 me tallic phase primarily aids the formation of diamond to diamond bonds duri ng sintering. During harsh rock drilling applications at elevated temperat ures\, the same cobalt expands more than the diamond\, straining the diamo nd matrix and leading to premature failure of the component [1]. Since the PCD material formed is virtually a two-phase material comprising of cobal t and diamond\, substantial volumes of the metallic phase can be removed t hrough a leaching process without compromising the cohesiveness of the dia mond matrix [2]. The leaching process reportedly results in a product with improved thermal stability and overall improved wear resistance. A system atic investigation and evaluation of the average in-plane residual stress fields on fatigue loaded leached PCD disc samples were undertaken. Whilst the Raman results reported a progressive shift of the residual stresses fr om an average compressive stress state to an average tensile stress state with an increasing number of loading cycles\, the X-ray diffraction method recorded compressive stresses throughout. This apparent disagreement in r esults is likely due to differences in the way the two methods measure the residual stresses. Our results in this regard are presented and discussed in the context of several other reports of similar discrepancies in stres s result measurements as reported by the Raman spectroscopy and the X-ray diffraction method.\n\n1. Belnap\, D.\, Effect of cobalt on PCD fracture t oughness. ASM International\, Member/Customer Service Center Materials Par k OH 44073-0002 United States\, 2010: p. 2424 - 2434.\n2. Yahiaoui\, M.\, J.-Y. Paris\, Delbé\, Karl\, J. Denape\, L. Gerbaud\, C. Colin\, O. Ther\ , and A. Dourfaye\, Quality and wear behavior of graded polycrystalline di amond compact cutters. International Journal of Refractory Metals and Hard Materials\, 2016. 56: p. 87 - 95.\n\nhttps://events.saip.org.za/event/173 /contributions/2116/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2116/ END:VEVENT BEGIN:VEVENT SUMMARY:X-ray and Neutron Radiography/Tomography at Necsa: A success story DTSTART;VALUE=DATE-TIME:20191113T092500Z DTEND;VALUE=DATE-TIME:20191113T095000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2117@events.saip.org.za DESCRIPTION:Speakers: Frikkie De Beer (Necsa)\nNecsa 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 Pelinda ba\, 35 km West of Pretoria. \nTrue to the mission of Necsa to engage with stakeholders in the area of radiation sciences\, international and nation al researchers and post graduate students are actively utilizing the imagi ng facilities through successful User Office beam line applications. Nucle ar related areas such as post irradiation examination of nuclear fuel\, or the characterization of barriers for nuclear waste within the nuclear fue l cycle\, are addressed by this technology. However\, the technical expert ise of instrument scientists are being development and molded through the utilization of these facilities by researchers and post graduate students from Higher Educational Institutes (HEI’s) and research centers\, thus c ontributing to and supporting the National System of Innovation (NSI). \nT he neutron radiography/tomography facility is currently in an upgrade phas e to enhance the versatility of the facility to supply not only a thermal neutron beam but also predominantly fast neutron as well as Gamma-Ray radi ation beams. A section of this presentation focusses on the successes and research highlights achieved at the SANRAD facility. \nTo complement the neutron imaging probe at Necsa\, X-ray tomography and micro-focus X-Ray to mography as imaging probes were introduced and implemented in 2007 and 201 1 respectively. This facility at Necsa\, in concurrence with the µXCT fac ilities at WITS and SUN\, which were established through NRF support in 20 11 to address the needs of local researchers in 3D analytical and non-dest ructive testing research capabilities.. It is generally perceived that the outcome of research conducted at these local µXCT facilities forms the b asis of ground work research to be performed before a competitive project proposal can being submitted to a synchrotron facility. \nSince the establ ishment of the µXCT (MIXRAD) facility at Necsa\, the available beam time is fully booked as\, on average\, approximately 35 research projects per a nnum are being submitted for support. To date\, the academic research outp ut comprises of more than 150 publications including post graduate dissert ations and thesis’s\, which spans all scientific fields ranging from pal aeosciences to soil\, geoscience\, civil engineering and biosciences to na me a few. This presentation will also highlight the application of µXCT i n various research fields to show its versatility but also the important r ole it plays within the NSI and the South African research community.\n\nh ttps://events.saip.org.za/event/173/contributions/2117/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2117/ END:VEVENT BEGIN:VEVENT SUMMARY:Thin films of VC/SiC - Kuda. Jakata DTSTART;VALUE=DATE-TIME:20191113T090000Z DTEND;VALUE=DATE-TIME:20191113T092500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2132@events.saip.org.za DESCRIPTION:Speakers: Kudakwashe Jakata (University of the Witwatersrand)\ nhttps://events.saip.org.za/event/173/contributions/2132/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2132/ END:VEVENT BEGIN:VEVENT SUMMARY:Innovations in Energy Materials - Marcus Newton DTSTART;VALUE=DATE-TIME:20191113T090000Z DTEND;VALUE=DATE-TIME:20191113T092500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2136@events.saip.org.za DESCRIPTION:Speakers: Marcus Newton (University of Southampton)\nhttps://e vents.saip.org.za/event/173/contributions/2136/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2136/ END:VEVENT BEGIN:VEVENT SUMMARY:Research Activities: Advanced Manufacturing Technologies DTSTART;VALUE=DATE-TIME:20191113T080000Z DTEND;VALUE=DATE-TIME:20191113T083000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2141@events.saip.org.za DESCRIPTION:Speakers: Fred Mada ()\nhttps://events.saip.org.za/event/173/c ontributions/2141/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2141/ END:VEVENT BEGIN:VEVENT SUMMARY:The Search for an Improved SOFC Electrolyte Material: Stabilizing the Fm3 ̅m Phase of Bismuth Oxide to Lower Temperatures DTSTART;VALUE=DATE-TIME:20191113T092500Z DTEND;VALUE=DATE-TIME:20191113T095000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2142@events.saip.org.za DESCRIPTION:Speakers: Kiefer Mattias ()\nhttps://events.saip.org.za/event/ 173/contributions/2142/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2142/ END:VEVENT BEGIN:VEVENT SUMMARY:Dithiadiazolyl radicals as building blocks for functional material s DTSTART;VALUE=DATE-TIME:20191113T095000Z DTEND;VALUE=DATE-TIME:20191113T101500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2148@events.saip.org.za DESCRIPTION:Speakers: Delia Haynes (Stellenbosch University)\nThe 1\,2\,3\ ,5-dithiadiazolyl radicals (DTDAs)\, R-CNSSN•\, are of considerable inte rest due to their potential as magnetic or conducting materials. However\, DTDAs tend to dimerise in the solid state via an interaction known as pan cake bonding.[1] Pancake bonding between DTDAs results in spin pairing\, r endering the resulting materials diamagnetic. Overcoming this dimerization interaction has been the focus of much effort\, and several DTDAs that re main paramagnetic in the solid state have been characterised\, with some e xhibiting magnetic ordering at low temperatures.[2] This presentation will present our efforts in characterising solid-state materials containing DT DAs using a combination of X-ray diffraction experiments\, computational m ethods and spectroscopy.\nIn order to better understand (and thus overcome ) the pancake bonding interaction\, we have turned to experimental charge density investigations.[3] An analysis of the topology of the charge densi ty of a series of DTDAs reveals how pancake bonding differs from both cova lent bonding and conventional intermolecular interactions.\nWe have also e xplored the incorporation of DTDAs into multi-component crystals\, includi ng co-crystals[4] and porous materials\,[5] in order to overcome dimerisat ion. Co-crystal formation with DTDAs has been shown to be highly dependent on experimental conditions. Inclusion of DTDAs in porous hosts shows grea t potential for the development of functional materials.\nFinally\, we hav e investigated the coordination of DTDAs to metalloporphyrins\, yielding a t least one new material with intriguing properties. [6] It is clear that DTDAs show great potential as building blocks in the construction of molec ular materials.\n\n[1] Z. Cui\, H. Lischka\, H. Z. Beneberu and M. Kertesz \, J. Am. Chem. Soc.\, 2014\, 136\, 12958\; K. Preuss\, Polyhedron\, 2014\ , 79\, 1\; H. Z. Beneberu\, Y.-H. Tian and M. Kertesz\, Phys. Chem. Chem. Phys.\, 2012\, 14\, 10713.\n[2] see D. A. Haynes\, CrystEngComm\, 2011\, 1 3\, 4793 and references therein.\n[3] S.Domagała\, K. Kość\, S. W. Robi nson\, D. A. Haynes and K. Woźniak\, Cryst. Growth Des.\, 2014\, 14\, 483 4\; S. Domagała and D. A. Haynes\, CrystEngComm\, 2016\, 18\, 7116.\n[4] C. Alan\, D. A. Haynes\, C. M. Pask\, and J. M. Rawson\, CrystEngComm\, 20 09\, 11\, 2048\; S. W. Robinson\, D. A. Haynes and J. M. Rawson\, CrystEng Comm\, 2013\, 15\, 10205.\n[5] V. I. Nikolayenko\, L. J. Barbour\, A. Arau zo\, J. Campo\, J. M. Rawson and D. A. Haynes\, Chem. Commun.\, 2017\, 53\ , 11310\; S. V. Potts\, L. J. Barbour\, D. A. Haynes\, J. M. Rawson and G. O. Lloyd\, J. Am Chem. Soc.\, 2011\, 133\, 12948.\n[6] D. A. Haynes\, L. J. van Laeren and O. Q. Munro\, J. Am. Chem. Soc.\, 2017\, 139\, 14620.\n\ nhttps://events.saip.org.za/event/173/contributions/2148/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2148/ END:VEVENT BEGIN:VEVENT SUMMARY:Complimentary diffraction techniques at Necsa DTSTART;VALUE=DATE-TIME:20191113T101500Z DTEND;VALUE=DATE-TIME:20191113T104000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2167@events.saip.org.za DESCRIPTION:Speakers: Deon Marais (Necsa SOC Limited)\nComplimentary to us ing synchrotron light\, neutrons as well as laboratory X-rays play invalua ble instrumental roles in the study of materials and their characteristics . South Africa\, through The South African Nuclear Energy Corporation (Nec sa) SOC Limited\, offers both neutron and X-ray diffraction capabilities t o the scientific and industrial communities. Necsa's X-ray diffraction lab oratory houses two commercial diffractometers from Bruker: the D8 Discover (surface strain scanning) and the D8 Advance (surface powder diffraction) . The Neutron Diffraction Facility is located at the SAFARI-1 research rea ctor and consists of the neutron diffractometers MPISI (Materials Probe fo r Internal Strain Investigations) and PITSI (Powder Instrument for Transit ion in Structure Investigations). Access to these instruments is through a n active user program and beam time is awarded based on scientific merit. Services are provided at no cost (excluding consumables) under the Nationa l System of Innovation and are also available on a commercial basis for pr oprietary projects.\n\nThis presentation will give a brief overview of the instrument technical specifications and focus on typical projects and app lications that have been investigated using these instruments. Stress rela ted projects include surface and 2D depth-resolved stress mapping of large engineering samples to thin coatings. Examples of surface as well as bulk material crystallographic texture (preferred orientation) measurements wi ll also be shown. Powder diffraction examples include the study of tempera ture dependent phase transformations using in-situ sample environments suc h as a closed-cycle cryostat and vacuum furnace. Room temperature / atmosp heric studies and quantitative phase analysis are routinely performed. Stu dent projects and facility visits are encouraged.\n\nhttps://events.saip.o rg.za/event/173/contributions/2167/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2167/ END:VEVENT BEGIN:VEVENT SUMMARY:The effect of Cs content on the structural and photo physical prop erties in mixed cation hybrid-perovskites DTSTART;VALUE=DATE-TIME:20191113T072500Z DTEND;VALUE=DATE-TIME:20191113T074500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2168@events.saip.org.za DESCRIPTION:Speakers: Adam Shnier ()\nhttps://events.saip.org.za/event/173 /contributions/2168/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2168/ END:VEVENT BEGIN:VEVENT SUMMARY:Superionic conductors for solid oxide fuel cells: structure-bulk p roperty relationships in Bi2O3 based solid solutions DTSTART;VALUE=DATE-TIME:20191113T074500Z DTEND;VALUE=DATE-TIME:20191113T080500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2181@events.saip.org.za DESCRIPTION:Speakers: Sikhumbuzo Masina (Molecular Science Institute\, Sch ool of Chemistry\, University of the Witwatersrand\, private bag X3\ , Johannesburg\, 2050\, South Africa)\nSolid oxide fuel cells (SOFCs) are electrochemical devices that convert chemical energy directly to electrica l energy with reduced CO2\, SO2 and NOx emissions [1]. They are highly eff icient and when operated in combined heat and power mode they can reach ef ficiencies above 80% [2]. These devices have been known since Bauer and Pr eis reported their first use to produce electricity in 1937 [3]. Over 100 years have passed but no large scale production of such efficient devices have been achieved. The main problem is the high temperature at which they operate (800-1000°C). The operation temperature is mainly determined by the electrolyte\; an oxide ion conducting ceramic that rely largely on the rmally activated oxide ion hopping mechanism (vacancy mechanism) for ionic transport. The state of the art electrolyte is yttria-stabilized zirconia (YSZ). YSZ has conductivities ranging between 0.01 Scm-1 and 0.1 Scm-1 at 800°C and 1000°C respectively [4]. These high temperatures require the use of expensive materials with high melting points such as doped LaCrO3 f or interconnects.\n \nElectrolytes that show promise are the solid solutio ns of Bi2O3. Bi2O3 in its fluorite δ-phase is highly defective\, with 25% of the oxygen sites vacant and is reported to have conductivities of abou t 1 Scm-1 at 730 °C\, the highest for an oxide ion conducting ceramic rep orted thus far [5]. Unfortunately\, the δ-phase is only stable within a n arrow temperature range of 730-824°C [6]. Below this range\, a monoclinic α-phase exist which is predominantly an electronic conductor and Bi2O3 m elts at 825°C [7]. To stabilize the highly conductive defect fluorite pha se\, isovalent and aliovalent cations have been used to substitute for the Bi3+ cation in the structure. In our work\, we have fabricated solid solu tions of Bi2O3 using the double and triple doping strategies. We have also followed crystal phase changes and measured conductivities with variable temperature XRD and electrochemical impedance spectroscopy respectively. T he local environment was probed with variable temperature Raman spectrosco py. This enables us to study the cubic phase and get insight into the stru cture-property correlations of materials reported to have high conductivit ies.\n\n[1] Stambouli\, A.B and Traversa\, E. Renewable and sustainable en ergy reviews. 2002\, 6\, 433-455.\n[2] Ormerod\, R.M. Chemical Society Rev iews. 2003\, 32\, 17-28.\n[3] Huang\, K and Goodenough\, J.B. Solid oxide fuel cell technology: principles\, performance and operations. 2009. Wood head Publishing Limited. Cambridge.\n[4] Fergus\, J.W. Journal of Power So urces. 2006 162\, 30-40.\n[5] Takahashi\, T\; Iwahara\, H and Nagai\, Y. J ournal of Applied Electrochemistry. 1972\, 2\, 97-104.\n[6] Rao\, C.R\; R ao\, G.S and Ramdas\, S. The Journal of Physical Chemistry. 1969\, 73\, 67 2-675.\n[7] Drache\, M\; Roussel\, P and Wignacourt\, J.P. Chemical review s. 2007\, 107\, 80-96.\n\nhttps://events.saip.org.za/event/173/contributio ns/2181/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2181/ END:VEVENT BEGIN:VEVENT SUMMARY:Relevance of Synchrotron Radiation in Inorganic Medicinal Chemistr y DTSTART;VALUE=DATE-TIME:20191113T080500Z DTEND;VALUE=DATE-TIME:20191113T083000Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2185@events.saip.org.za DESCRIPTION:Speakers: Ayodele Temidayo Odularu (University of Fort Hare)\n Abstract\n\nRelevance of Synchrotron Radiation in Inorganic Medicinal Chem istry\n\nODULARU\, Ayodele Temidayo1\nDepartment of Chemistry\, University of Fort Hare\, Alice 5700\, South Africa.\n\nCorresponding Author: 201106 223@ufh.ac.za/ayodeleodularu@gmail.com\n\nThis study entails how three syn chrotron radiation spectroscopic techniques (infrared microspectroscopy\, microphobe X-ray fluorescence imaging\, and X-ray absorption spectroscopy) are useful instrumentations to medicinal inorganic chemists in order to s olve inorganic medicinal chemistry challenges. The study focuses on cellul ar uptake circulation\, conventional bio transformed conventional agents\, and future therapeutic agents.\n\nKeywords: Challenges in inorganic medic inal chemistry\; synchrotron radiation spectroscopic techniques\; therapeu tic agents\n\nReferences\n1. Dillion\, C. T. Synchrotron Radiation Spectro scopic Techniques as Tools for the Medicinal Chemist: Microprobe X-ray Flu orescence Imaging\, X-Ry Absorption Spectroscopy\, and Infrared Microspect roscopy. Austral. J. Chem. 2011\, 65\, 204-217.\n2. Lin\, J.\; Lin\, G.\; Li\, Y.\; Gao\, X.\; Du\, H.\; Jia\, C.\; Lu\, H.\; Golka\, K.\; Shen\, J. Assessment of Usefulness of Synchrotron Radiation Techniques to Determine Arsenic Species in Hair and Rice Grain Samples. Excli. J. 2017\, 16\, 25- 34.\n3. Hettiarachchi\, G. M.\; Donner\, E.\; Doelsch\, E. Application of Synchrotron Radiation-Based Methods for Environmental Geochemistry: Introd uction to the Special Section. J. Environ. Qual. 2017\, 46\, 1139-1145.\n\ nhttps://events.saip.org.za/event/173/contributions/2185/ LOCATION: Titanium Room URL:https://events.saip.org.za/event/173/contributions/2185/ END:VEVENT BEGIN:VEVENT SUMMARY:HARPIA: High Resolution Powder X-ray Diffraction beamline at Siriu s DTSTART;VALUE=DATE-TIME:20191113T095000Z DTEND;VALUE=DATE-TIME:20191113T101500Z DTSTAMP;VALUE=DATE-TIME:20260416T025349Z UID:indico-contribution-116-2196@events.saip.org.za DESCRIPTION:Speakers: Dean Barrett (CNPEM/Wits)\nSirius is a fourth-genera tion synchrotron light source built at the CNPEM and is forecast to begin operations in 2020. Brazil is transitioning from a second-generation synch rotron source (UVX) to a leading position in the design and operation of t he brightest 4th-generation machine in its energy class. This multidiscipl inary research infrastructure will bring an advanced facility to the struc tural characterization of polycrystalline samples – HARPIA beamline. The synchrotron source of HARPIA will be an undulator with an 18 mm period le ngth and importantly\, without an energy gap. The beamline will be instal led in a low- straight section of the storage ring to increase the beam size in the horizontal direction. HARPIA’s optical design aims to be si mple\, yet highly effective to provide high photon flux at the sample posi tion\, ≈2.21012 ph/s/100 mA at 20 keV\, about 1000 times higher than that of the LNLS at 8 keV. Energy selection will be obtained by the Bruker double-crystal-monochromator. The two sets of Si crystals\, (111) and (33 3)\, will allow an energy range from 5 to 30 keV. The beam size at the sam ple position is calculated to be around 0.85 mm (v) x 1.2 mm (h) with a di vergence of 25 rad (v) x 34 rad (h) at 20 keV. HARPIA’s experiment al hutch (Fig. 1) will provide high-resolution X-ray diffraction data with a multi-analyser crystal from FMB Oxford having at least 8 modules of Si( 111) crystals and NaBr2 scintillators detectors. Moreover\, it will allow dynamic experiments using a linear fast detector developed in-house coveri ng 90° in 2theta range to provide second scale temporal resolution.\n\nTh e 3 co-axial circle heavy-duty diffractometer from the current XRD1 beamli ne at LNLS will be transferred to the HARPIA experimental hutch. X-ray dif fraction measurements will be conducted in Debye-Scherrer geometry (capill ary geometry). The diffractometer uses high precision rotary stages (Ɵ\, 2Ɵ and d axes) and is designed to support heavy detector arrays\, such as the two sets of detectors in the aforementioned paragraph. \n\nA storage magazine for samples placed into capillaries allows hundreds of samples to be loaded and measured via the use of a robotic arm which serves as a sam ple exchanger. The robotic arm allows for the beamline to be programmed an d\, if necessary\, operated remotely providing high levels of efficiency a nd maximization of the provided beamtime. HARPIA beamline will provide an efficient and user-friendly facility to the structural characterization of polycrystals in a variety of sample environments as well as fast and high -resolution mode detection to Sirius users.\n\nAcknowledgments: FAPESP and CNPEM.\n\nhttps://events.saip.org.za/event/173/contributions/2196/ LOCATION: Silver Room URL:https://events.saip.org.za/event/173/contributions/2196/ END:VEVENT END:VCALENDAR