BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:A Morphotropic Phase Boundary in Samarium-modified Bismuth Ferrite Thin Films DTSTART;VALUE=DATE-TIME:20160204T214500Z DTEND;VALUE=DATE-TIME:20160204T221500Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-530@events01.synchrotron.org.au DESCRIPTION:Speakers: Nagarajan Valanoor (UNSW Australia)\nInterfacial con trol of a polar (rhombohedral)-to-non-polar (orthorhombic) phase transitio n in (001) oriented epitaxial BiFeO3/(Bi1-xSmx)FeO3 superlattices is prese nted. We demonstrate controlling the composition at which a polar phase tr ansformation takes place by tuning the strength of the interlayer interact ions while holding the average composition constant. It is shown that the thickness of the superlattice layers have a strong influence on the inter layer polar coupling\, which in turn changes the phase transition. For sho rtest periods studied (layers 5 and 10 nm thick) the onset of the phase tr ansition is suppressed along with a significant broadening (as a function of Sm3+ concentration) of an incommensurately modulated phase\, determined by two-dimensional x-ray diffraction mapping. Consequently\, ferroelectri c character with robust polarization hysteresis and enhanced dielectric co nstant\, is observed even for substitution concentration of Sm3+ which wou ld otherwise lead to a leaky paraelectric in single-layer (Bi1-xSmx)FeO3 f ilms. The experimental results are fully consistent with a mean-field ther modynamic theory which reveals that the strength of the interlayer couplin g is strongly affected by the polar-polar interaction across the interface . Part of this work appears in Phys. Rev. B 90\, 245131(2014).\n\nhttps:// events01.synchrotron.org.au/event/19/contributions/530/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/530/ END:VEVENT BEGIN:VEVENT SUMMARY:Crystalline self-stratification in polymer thin films DTSTART;VALUE=DATE-TIME:20160202T230000Z DTEND;VALUE=DATE-TIME:20160202T233000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-526@events01.synchrotron.org.au DESCRIPTION:Speakers: Eliot Gann (Australian Synchrotron)\nThe orientation of molecules within thin films is of critical importance to the emerging field of organic electronics. Particularly in the case of solution proces sable polymers and small molecules\, where alkyl side chains\, included fo r solubility\, impede conduction along that molecular direction\, understa nding and controlling the molecular orientation both at surfaces and in th e bulk of thin films is increasingly important to further increase electro nic performance. Grazing Incidence Wide Angle X-ray Scattering has been w idely used to look at the orientation of crystallites within films\, but a capability which has not been widely used is its potential to characteriz e the depth within films at which different kinds of molecular stacking oc cur. Using very fine control over the angle of incidence of the X-ray bea m\, we observe a distinct segregation of edge-on crystallinity in a film o f the polymer PNDI-SVS which otherwise stacks in a highly face-on orientat ion. Using simulations of the X-ray Electric Field Intensity within the f ilm\, the angular variation of scattering intensity can be matched\, resul ting in the conclusion that the surface region extends 9 nm into the 72 nm film. \n\nDuring the spin-coating deposition process\, a face-on orienta tion is initially observed\, likely the result of preaggregation in soluti on in combination with a relatively fast-drying solvent. The stratified mo rphology is produced by annealing the film for a brief time\, while upon f urther annealing\, the bulk of the film eventually reorients to become edg e-on\, suggesting that the stratification is a non-equilibrium\, kinetical ly-trapped state. With brief annealing\, only the surface region of the fi lm has time to reorient to the ultimately lower energy edge-on orientation . The time and temperature of this reorganization can reveal the differen ce in energetics at different depths within the film\, illustrating how gr azing incidence scattering can open up the possibility of examining thin f ilms in novel and important ways.\n\nhttps://events01.synchrotron.org.au/e vent/19/contributions/526/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/526/ END:VEVENT BEGIN:VEVENT SUMMARY:The endless possibilities of graphene on heteroepitaxial silicon c arbide DTSTART;VALUE=DATE-TIME:20160203T214500Z DTEND;VALUE=DATE-TIME:20160203T221500Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-521@events01.synchrotron.org.au DESCRIPTION:Speakers: Francesca Iacopi (Griffith University\, Queensland M icro and Nanotechnology Centre)\nEpitaxial graphene grown using solid sour ce carbon from silicon carbide wafers has been for long time the only rout e to obtain high quality graphene directly grown at the wafer –level\, w hich is crucial to realise the promise of graphene for nanodevices. Noneth eless\, the capability of obtaining comparable quality of graphene on sili con as opposed to silicon carbide wafers\, would open an immense opportuni ty for graphene in integrated circuits and micro-systems in general. While encouraging results have been obtained through thermal decomposition of h eteroepitaxial SiC films on silicon wafers\, this has usually been limited to small areas and to the use of Si (111) surfaces. Moreover\, the obtain ed graphene quality tends to be strongly hampered by the upper limitation in synthesis temperature set by the melting temperature of silicon. \nWe have recently demonstrated for the first time that most of those limitatio ns can be overcome with the use of heteroepitaxial silicon carbide films i n combination with a catalytic alloy of nickel and copper. With this appro ach we obtain 2 layers graphene on silicon carbide with uniform coverage o ver the silicon wafer and an average ID/IG ratio of about 0.2 +/- 0.05 [1] \, indicating a substantial improvement as compared to a ratio of ~1 and a bove of graphene through the more conventional thermal decomposition. This novel catalytic approach on silicon holds high promise for integrated app lications also through the capability for straightforward graphene micropa tterning through self-aligned synthesis on pre-structured silicon carbide on silicon [2]. Moreover\, we have demonstrated the potential for this app roach to fabricate high –performing electrodes for integrated supercapac itor structures [3].\n[1] F.Iacopi\, N.Mishra\, B.V.Cunning\, D.Goding\, S .Dimitrijev\, R.Brock\, R.H.Dauskardt\, B.Wood and J.J.Boeckl\, “A catal ytic alloy approach for highly uniform graphene on epitaxial SiC on silico n wafers”\, J.Mater.Res.30(5)\, 609-616\, 2015.\n[2] B.V.Cunning\, M.Ahm ed\, N.Mishra\, A.R.Kermany\, B.Wood\, F.Iacopi\, “Graphitized silicon c arbide microbeams on silicon: wafer-level\, self -aligned graphene on sili con wafers”\, Nanotechnology 25\, 325301\, 2014.\n[3] M.Ahmed\, M.Khawaj a\, M.Notarianni\, B.Wang\, D.Goding\, B.Gupta\, J.J. Boeckl\, A.Takshi\, N.Motta\, S.E.Saddow\, F.Iacopi\, “A thin film approach for SiC–derive d graphene as an on-chip electrode for supercapacitors”\, Nanotechnology 26\, 434005\, 2015.\n\nhttps://events01.synchrotron.org.au/event/19/contr ibutions/521/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/521/ END:VEVENT BEGIN:VEVENT SUMMARY:Pluto: the next frontier for studies of condensed matter DTSTART;VALUE=DATE-TIME:20160202T220000Z DTEND;VALUE=DATE-TIME:20160202T223000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-520@events01.synchrotron.org.au DESCRIPTION:Speakers: Helen Brand (Australian Synchrotron.)\nIn July this year\, the NASA New Horizons spacecraft completed an historic flyby of the Plutonian system\, the first spacecraft to visit Pluto. The long-awaited data from this mission will take months to be returned in full to Earth. H owever\, the wealth of data received so far\, although small in volume\, i s already providing amazing insights into the surface morphology and geoch emistry of Pluto and providing important clues into the inner workings of this dwarf planet.\n\nNew Horizons is equipped with high resolution imagin g cameras as well as geochemical equipment to investigate surface and atmo spheric compositions. Using a combination of geological mapping\, geochemi cal data and other physical measurements\, planetary scientists aim to det ermine the processes that shape the interior and surface of Pluto and othe r outer solar system objects. \n\nIn situ studies of the materials found o n bodies within the outer solar system is an emerging area\, both for plan etary science and for research in Australia. The conditions of the icy sat ellites are simulated while data\, typically diffraction\, (X-ray or neutr on)\, or IR data\, is recorded. The observations and material properties o btained in these studies can then be used as a comparison to spacecraft da ta or an input to models of geological processes. \n\nThis contribution wi ll include a background introduction to the New Horizons mission\, an over view of the findings and data so far\, and a discussion of how structural condensed matter studies\, particularly synchrotron and neutron studies\, can unlock the processes that govern the outer solar system.\n\nhttps://ev ents01.synchrotron.org.au/event/19/contributions/520/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/520/ END:VEVENT BEGIN:VEVENT SUMMARY:Towards Realisation of High-Performance Thermoelectrics for Energy Conversion DTSTART;VALUE=DATE-TIME:20160203T040000Z DTEND;VALUE=DATE-TIME:20160203T043000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-507@events01.synchrotron.org.au DESCRIPTION:Speakers: Zhigang Chen (the University of Queensland)\nThermoe lectric materials directly convert thermal energy into electrical energy\, offering a green and sustainable alternative for the global energy market .[1\, 2] So far\, extensive investigations have been made to improve the t hermoelectric efficiency\, which governed by the dimensionless figure-of-m erit ZT ( )\, where σ is the electrical conductivity\, S is the Seebeck c oefficient\, T is the absolute temperature\, and  is the total thermal conductivity which is the sum of the contributions from its electron (e ) and lattice (L) components. Here\, we developed cost-effective\, and low-toxic thermoelectrics for high-efficiency energy conversion using nove l industry-level approach\, coupled with nanostructure and band engineerin g strategies. Through effective design of thermoelectric materials with en gineered chemistry and unique structure\, and advanced manufacturing\, hig h-performance thermoelectrics\, such as Cu2Se\,[3] Bi2Se3\,[4] Bi2Te3\,[5- 8] In3Se4\,[9\, 10] etc.\, have been realised in our group. Such innovativ e technology can be used for harvesting electricity from waste heat or sun light. \n\nReferences\n[1] Z.-G. Chen\, G. Han\, L. Yang\, et al.\, Pr og. Nat. Sci. 2012\, 22\, 535.\n[2] G. Han\, Z.-G. Chen\, J. Drennan\, et al.\, Small 2014\, 10\, 2747.\n[3] L. Yang\, Z.-G. Chen\, G. Han\, e t al.\, Nano Energy 2015\, 16\, 367.\n[4] M. Hong\, Z.-G. Chen\, L. Yan g\, et al.\, Adv. Elect. Mater. 2015\, 1\, 201500025.\n[5] G. Han\, Z.- G. Chen\, L. Yang\, et al.\, Acs Appl. Mater. Inter. 2015\, 7\, 989.\n[6] L. Cheng\, Z.-G. Chen\, L. Yang\, et al.\, J. Phy. Chem. C 2013\, 117\, 12458.\n[7] L. Yang\, Z.-G. Chen\, M. Hong\, et al.\, ACS Appl. Mater. Inter. 2015\, 7\, 23694.\n[8] L. Cheng\, Z.-G. Chen\, S. Ma\, et al.\, J. Am. Chem. Soc. 2012\, 134\, 18920.\n[9] G. Han\, Z.-G. Chen\, L. Ya ng\, et al.\, Cryst. Growth & Design 2013\, 13\, 5092.\n[10] G. Han\, Z .-G. Chen\, C. Sun\, et al.\, CrystEngComm 2014\, 16\, 393.\n\nhttps://eve nts01.synchrotron.org.au/event/19/contributions/507/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/507/ END:VEVENT BEGIN:VEVENT SUMMARY:Atomic-scale understanding of CO2 adsorption processes in metal-or ganic framework (MOF) materials using neutron scattering and ab initio cal culations DTSTART;VALUE=DATE-TIME:20160204T000000Z DTEND;VALUE=DATE-TIME:20160204T003000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-497@events01.synchrotron.org.au DESCRIPTION:Speakers: Josie Auckett (ANSTO)\nThe dependence of the industr ialised world on fossil-fuel energy generation technologies and consequent increase in atmospheric CO2 concentrations has been blamed for emerging a dverse climate effects\, including an increase in global mean temperatures [1]. Until renewable\, carbon-free energy sources can be efficiently harn essed to meet the world’s energy needs\, interim measures are sought to suppress the atmospheric release of CO2 from traditional coal and natural gas combustion processes. Microporous materials such as zeolites and metal -organic frameworks (MOFs) are therefore being investigated for the separa tion and capture of CO2 at various stages of the combustion cycle. \n\nMOF s represent one of the most promising classes of materials for this applic ation\, offering unrivalled tunability of structural and chemical characte ristics via the substitution of metals and choice and functionalisation of ligands [2]. In order for a MOF to be rationally tuned for improved perfo rmance\, the nature of the interactions between the host framework and gue st molecules must be well-understood at the atomic level. Our research tar gets this detailed understanding of MOFs using neutron scattering and comp utational methods. \n\nWe are currently investigating several MOFs which d isplay unexpected sorption properties such as “reverse sieving” – th at is\, selectively absorbing larger gas molecules while rejecting smaller ones – and unusual lattice expansion effects. Using in situ diffraction to locate the preferred binding sites of guest molecules in the framework \, inelastic neutron scattering to probe system dynamics\, and density fun ctional theory-based molecular dynamics simulations to validate and interp ret our experimental results\, we are able to gain detailed information ab out the mechanisms of gas uptake and diffusion in these exciting new MOF m aterials.\n\n[1] S. Solomon\, G.K. Plattner et al.\, Proc. Natl. Acad. Sci . USA **106** (2009) 1704-1709.\n\n[2] G.J. Kearley & V.K. Peterson (eds.) \, Neutron Applications in Materials\, Springer (2015).\n\nhttps://events0 1.synchrotron.org.au/event/19/contributions/497/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/497/ END:VEVENT BEGIN:VEVENT SUMMARY:X-radiation in health and disease: Novel approaches to the study o f disease processes and therapy DTSTART;VALUE=DATE-TIME:20160204T030000Z DTEND;VALUE=DATE-TIME:20160204T033000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-476@events01.synchrotron.org.au DESCRIPTION:Speakers: Damian Myers (The University of Melbourne)\nOur curr ent medical knowledge and understanding of human biology and physiology ha ve been predicated by our capacity to image organs\, body structures\, dif ferent types of tissues and particular cell types. These imaging modalitie s range from advanced microscopy for imaging of cells and tissues through to 2D and 3D macroscopic techniques for imaging of tissues and organs. Sof t tissues in particular are difficult to image\, especially when surrounde d by dense structures such as bone. Also\, some regions\, such as the brai n\, require special investigative techniques as they are closed tissue/org an structures with low contrast features.\n\nMedical diagnoses\, monitorin g of disease progression\, efficacy of therapies and the recent advent of ‘targeted imaging’ rely upon techniques such as X-ray analysis\, MRI\, Positron Emission Tomography (PET) and more. In this seminar several rec ent adaptions of X-ray and synchrotron-based X-ray science will be related . In particular\, Phase-contrast X-ray imaging (PCXI)\, also termed microf ocus imaging\, X-ray Fluorescence Microscopy (XFM) and Microbeam X-ray The rapy (MRT) will be discussed. \n\nSince the discovery of X-rays and develo pment of medical X-ray sources\, X-ray imaging has accounted for approxima tely 60% of medical diagnostic procedures\; X-ray imaging is still the pre dominant technology used in medicine. Over the past 30 years radioisotope- based imaging has expanded substantially with 3D positron emission tomogra phy (PET) and combined PET/MRI being developed for simultaneous structural and functional imaging. More recently\, advanced 3D imaging techniques h ave been aligned with targeted therapies and high resolution multi-modal i maging to improve our capabilities in definition of organ boundaries and p articular tumours and organ abnormalities. Microbeam radiation therapy (MR T) is another capability and this is currently being developed at the Aust ralian Synchrotron. \n\nSynchrotrons produce a broad range of electromagne tic radiation applicable for diverse analyses such protein crystallography \, X-radiation for fluorescence spectroscopy\, for mapping and quantificat ion of trace metals\, and for fast X-ray tomography for structural imaging . Access to synchrotron light sources has led to a renaissance in utilisat ion of X-rays for diverse imaging applications and novel radiation therapi es. \n\nDuring this seminar the importance of advanced imaging techniques and synchrotron radiation to enable investigation of a range of diseases will be related. This presentation will include specific studies in which application of synchrotron radiation has aided investigations into bone di sease and bone cancers\, the study of brain abnormalities including epilep sy and traumatic brain injury and targeted therapy using MRT. \n\nAdvanced medical imaging techniques have been central to our understanding of dise ase processes and have the potential to aid clinicians when considering th erapeutic interventions. The strong synergy that occurs in interdisciplina ry research has been crucial to these developments. Project design and eff icient implementation of advanced imaging techniques to achieve meaningful outcomes in science and medicine will also be discussed.\n\nAcknowledgeme nt: The contribution of the many scientists and organisations involved wit h this work will be related during delivery of this invited seminar.\n\nht tps://events01.synchrotron.org.au/event/19/contributions/476/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/476/ END:VEVENT BEGIN:VEVENT SUMMARY:Two-dimensional Coulomb gas at negative temperature DTSTART;VALUE=DATE-TIME:20160205T000000Z DTEND;VALUE=DATE-TIME:20160205T003000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-468@events01.synchrotron.org.au DESCRIPTION:Speakers: Tapio Simula (Monash University)\nLars Onsager is pe rhaps best known as the recipient of 1968 Nobel Prize in chemistry and by his tour de force solution to the two-dimensional Ising model. However\, h is remarkable insight predicting the quantisation of vorticity in superflu id helium and the statistical mechanics description of two-dimensional tur bulence have received much less attention. In this talk\, I will briefly review certain aspects of the problem of two-dimensional turbulence with a particular emphasis on Onsager’s statistical hydrodynamics model. I wil l then apply this model to turbulent superfluid Bose—Einstein condensate s in which the quantised vortices have a long-range effective interaction and can be mapped to a two-dimensional Coulomb gas of positive and negativ e charged particles. By observing the dynamics of such vortex charges in n umerical simulations we have found them to spontaneously arrange to large scale vortex clusters\, coined Onsager vortices\, that correspond to absol ute negative Boltzmann temperatures [1]. I will discuss the microscopic me chanism leading to the emergence of such novel states of matter. Finally\, I will outline the recent progress in Australia and elsewhere toward expe rimentally observing such states [2] with the prospect of realising Onsage r’s prediction of super vortices in two-dimensional fluid turbulence. \ n\n\n[1] “Emergence of Order from Turbulence in an Isolated Planar Supe rfluid”\,\nTapio Simula\, Matthew J. Davis\, and Kristian Helmerson\,\nP hysical Review Letters **113**\, 165302 (2014).\n\n[2] “Vortex Gyroscope Imaging of Planar Superfluids”\, A. T. Powis\, S. J. Sammut\, and T . P. Simula\, Physical Review Letters **113**\, 165303 (2014).\n\nhttps: //events01.synchrotron.org.au/event/19/contributions/468/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/468/ END:VEVENT BEGIN:VEVENT SUMMARY:Engineering the Diamond Surface for Quantum Technologies DTSTART;VALUE=DATE-TIME:20160203T030000Z DTEND;VALUE=DATE-TIME:20160203T033000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-455@events01.synchrotron.org.au DESCRIPTION:Speakers: Alastair Stacey (Centre of Excellence for Quantum Co mputation and Communication Technology\, The University of Melbourne)\nQua ntum technologies promise exciting and transformative futures in many area s of human endeavour. An example is the field of bio-sensing\, where quant um probes are already being used to answer fundamental questions about liv ing cells. In these applications diamond often takes centre stage\, as a m aterial which simultaneously exhibits both bio-friendly and quantum-friend ly properties. This presentation will review efforts to exploit diamond fo r quantum bio-sensing applications\, encompassing practical cellular measu rements to the development of fundamentally new sensing techniques. In par ticular\, I will address the biggest materials challenge we currently face \, which is the presence of uncontrolled defects at the solid state surfac e\, and detail the use of surface science techniques\, based at the Austra lian Synchrotron\, to understand and re-engineer this important quantum/li fe interface.\n\nhttps://events01.synchrotron.org.au/event/19/contribution s/455/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/455/ END:VEVENT BEGIN:VEVENT SUMMARY:Quantitative Femtosecond Charge Transfer Dynamics at Organic/Elect rode Interfaces Studied by Core-Hole Clock Spectroscopy DTSTART;VALUE=DATE-TIME:20160203T000000Z DTEND;VALUE=DATE-TIME:20160203T003000Z DTSTAMP;VALUE=DATE-TIME:20260809T080213Z UID:indico-contribution-153-434@events01.synchrotron.org.au DESCRIPTION:Speakers: Dongchen Qi (Department of Chemistry and Physics\, L IMS\, La Trobe University)\nOrganic semiconductors have important applicat ions in organic electronics and other novel hybrid devices. In these devic es\, the transport of charge carriers across the interfaces between organi c molecules and electrodes plays an important role in determining the devi ce performance. Charge transfer dynamics at these interfaces usually occur s at the several femtoseconds timescale which presents tremendous challeng es to conventional pumb-probe based time-resolved techniques. In this talk \, I will introduce our recent work in the application of synchrotron-base d core-hole clock (CHC) spectroscopy on the quantitative characterisation of charge transfer dynamics in several model organic/electrode systems. Th e CHC technique allows us to quantify the interfacial charge transfer time s with element and site/orbital specificity. Combined with other soft x-ra y spectroscopies\, it enables us to identify a few critical factors affect ing the charge transfer dynamics at organic/electrode interfaces.\n\n\n\n\ n**Reference**\n\nL. Cao\, X.-Y. Gao\, A. T. S. Wee\, and D.-C. Qi\, *Adv. Mater.* **26**\, 7880 (2014).\n\nhttps://events01.synchrotron.org.au/even t/19/contributions/434/ LOCATION: URL:https://events01.synchrotron.org.au/event/19/contributions/434/ END:VEVENT END:VCALENDAR