ORCID Profile
0000-0001-6242-7059
Current Organisations
Rudjer Boskovic Institute
,
Australian Synchrotron
,
Australian Nuclear Science and Technology Organisation
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Publications
High efficiency X-ray nanofocusing by the blazed stacking of binary zone plates
Publisher: SPIE
Date: 26-09-2013
DOI: 10.1117/12.2022640
Dynamic coherent diffractive imaging using unsupervised identification of spatiotemporal constraints
Publisher: Optica Publishing Group
Date: 19-11-2020
DOI: 10.1364/OE.408530
Abstract: Dynamic coherent diffractive imaging (CDI) reveals the fine details of structural, chemical, and biological processes occurring at the nanoscale but imposes strict constraints on the object distribution and illumination. Ptychographic CDI relaxes these constraints by exploiting redundant information in data obtained from overlapping regions of an object, but its time resolution is inherently limited. We have extended ptychographic redundancy into the spatiotemporal domain in dynamic CDI, automatically identifying redundant information in time-series coherent diffraction data obtained from dynamic systems. Simulated synchrotron experiments show that high spatiotemporal resolution is achieved without a priori knowledge of the object or its dynamics.
Characterization of a multilayer Laue lens with imperfections
Publisher: Elsevier BV
Date: 11-2007
Highly Sensitive Quantitative Biological Imaging by Scanning X-ray Diffraction Microscopy
Publisher: International Union of Crystallography (IUCr)
Date: 16-08-2019
Angular spectrum simulation of X-ray focusing by Fresnel zone plates
Publisher: International Union of Crystallography (IUCr)
Date: 12-03-2013
DOI: 10.1107/S090904951300263X
Abstract: A computing simulation routine to model any type of circularly symmetric diffractive X-ray element has been implemented. The wavefield transmitted beyond the diffractive structures is numerically computed by the angular spectrum propagation method to an arbitrary propagation distance. Cylindrical symmetry is exploited to reduce the computation and memory requirements while preserving the accuracy of the numerical calculation through a quasi-discrete Hankel transform algorithm, an approach described by Guizar-Sicairos & Gutierrez-Vega [ J. Opt. Soc. Am. A , (2004), 21 , 53–58]. In particular, the code has been used to investigate the requirements for the stacking of two high-resolution Fresnel zone plates with an outermost zone width of 20 nm.
Observations of phase changes in monoolein during high viscous injection
Publisher: International Union of Crystallography (IUCr)
Date: 21-03-2022
DOI: 10.1107/S1600577522001862
Abstract: Serial crystallography of membrane proteins often employs high-viscosity injectors (HVIs) to deliver micrometre-sized crystals to the X-ray beam. Typically, the carrier medium is a lipidic cubic phase (LCP) media, which can also be used to nucleate and grow the crystals. However, despite the fact that the LCP is widely used with HVIs, the potential impact of the injection process on the LCP structure has not been reported and hence is not yet well understood. The self-assembled structure of the LCP can be affected by pressure, dehydration and temperature changes, all of which occur during continuous flow injection. These changes to the LCP structure may in turn impact the results of X-ray diffraction measurements from membrane protein crystals. To investigate the influence of HVIs on the structure of the LCP we conducted a study of the phase changes in monoolein/water and monoolein/buffer mixtures during continuous flow injection, at both atmospheric pressure and under vacuum. The reservoir pressure in the HVI was tracked to determine if there is any correlation with the phase behaviour of the LCP. The results indicated that, even though the reservoir pressure underwent (at times) significant variation, this did not appear to correlate with observed phase changes in the s le stream or correspond to shifts in the LCP lattice parameter. During vacuum injection, there was a three-way coexistence of the gyroid cubic phase, diamond cubic phase and lamellar phase. During injection at atmospheric pressure, the coexistence of a cubic phase and lamellar phase in the monoolein/water mixtures was also observed. The degree to which the lamellar phase is formed was found to be strongly dependent on the co-flowing gas conditions used to stabilize the LCP stream. A combination of laboratory-based optical polarization microscopy and simulation studies was used to investigate these observations.
Reconstruction of an astigmatic hard X-ray beam and alignment of K-B mirrors from ptychographic coherent diffraction data
Publisher: The Optical Society
Date: 22-10-2010
DOI: 10.1364/OE.18.023420
Coherent X-ray diffraction microscopy of extended objects
Publisher: International Union of Crystallography (IUCr)
Date: 23-08-2008
Ultimate limitations in the performance of kinoform lenses for hard x-ray focusing
Publisher: The Optical Society
Date: 05-06-2019
Quantitative biological imaging by ptychographic x-ray diffraction microscopy
Publisher: Proceedings of the National Academy of Sciences
Date: 17-12-2009
Abstract: Recent advances in coherent x-ray diffractive imaging have paved the way to reliable and quantitative imaging of noncompact specimens at the nanometer scale. Introduced a year ago, an advanced implementation of ptychographic coherent diffractive imaging has removed much of the previous limitations regarding s le preparation and illumination conditions. Here, we apply this recent approach toward structure determination at the nanoscale to biological microscopy. We show that the projected electron density of unstained and unsliced freeze-dried cells of the bacterium Deinococcus radiodurans can be derived from the reconstructed phase in a straightforward and reproducible way, with quantified and small errors. Thus, the approach may contribute in the future to the understanding of the highly disputed nucleoid structure of bacterial cells. In the present study, the estimated resolution for the cells was 85 nm (half-period length), whereas 50-nm resolution was demonstrated for lithographic test structures. With respect to the diameter of the pinhole used to illuminate the s les, a superresolution of about 15 was achieved for the cells and 30 for the test structures, respectively. These values should be assessed in view of the low dose applied on the order of ≃1.3·10 5 Gy, and were shown to scale with photon fluence.
Micro-scale dissolution seams mobilise carbon in deep-sea limestones
Publisher: Springer Science and Business Media LLC
Date: 27-08-2021
DOI: 10.1038/S43247-021-00257-W
Abstract: Measuring the amount of carbon captured in deep-sea limestones is fundamental to understanding the long-term carbon cycle because pelagic limestones represent Earth’s largest carbon sink since the mid-Mesozoic. However, their contribution to the long-term carbon cycle is poorly quantified. Here, we use X-ray fluorescence and scanning X-ray diffraction microscopy for high-resolution chemical and structural analysis of pelagic limestone from the Paleocene Kaiwhata Formation in New Zealand. We identify densely packed diagenetic micro-dissolution seams that are invisible to light and electron-beam microscopes in most cases. Mass-balance calculations indicate that in idual seams remove ~50% of the calcite mud matrix while their bulk-s le carbon loss adds up to ~10%. The liberated carbon is trapped in situ as calcite cement or returned to the ocean during physical compaction or soft-sediment deformation. We suggest micro-dissolution structures may play an important role in the long-term carbon cycle by modulating carbon exchange between the geosphere and hydrosphere.
The current state of and experiments with phylloxera-tolerant grapevine rootstocks
Publisher: International Society for Horticultural Science (ISHS)
Date: 11-2003
Ptychographic coherent diffractive imaging of weakly scattering specimens
Publisher: IOP Publishing
Date: 31-03-2010
Beryllium and lithium X-ray lenses at the APS
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.684350
Ptychographic Imaging of Low-Contrast Specimens
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3426111
Segmentation of Nanotomographic Cortical Bone Images for Quantitative Characterization of the Osteoctyte Lacuno-Canalicular Network
Publisher: AIP Publishing LLC
Date: 2016
DOI: 10.1063/1.4937534
Ptychographic Imaging in Materials and Life Sciences
Publisher: OSA
Date: 2009
High Spatial Resolution STXM at 6.2 keV Photon Energy
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3399261
Wave-optical simulation of hard-x-ray nanofocusing by precisely figured elliptical mirrors
Publisher: Optica Publishing Group
Date: 20-03-2007
DOI: 10.1364/AO.46.002010
Abstract: Computer simulations of nanofocusing by elliptical mirrors are presented wherein the diffraction and propagation of coherent hard x rays are predicted using wave-optical calculations. Surface height data acquired via microstitching interferometry were used to calculate the complex pupil function of a mirror, taking into account the Fresnel reflectivity and treating the surface topography as an aberration to a perfect elliptical mirror. The reflected wave-field litude and phase downstream of the mirror were obtained by numerically evaluating the Fresnel-Kirchhoff diffraction integral. Simulated intensity profiles and contours (isophotes) around the focal plane are presented for coherent illumination by a 15 keV point source, which indicate nearly diffraction-limited focusing at the 40 nm level. The effect of high spatial frequency microroughness on nanofocusing was investigated by low-pass filtering the Fourier spectrum of the residual height profile. Simulations using the filtered metrology data confirmed that roughness length scales shorter than 0.1 mm have a minor effect on the focal spot size and intensity.
Towards kilohertz synchrotron coherent diffractive imaging
Publisher: International Union of Crystallography (IUCr)
Date: 08-05-2022
DOI: 10.1107/S1600576722003466
Abstract: X-ray coherent diffractive imaging (CDI) techniques have been applied with widespread impact to study nanoscale material properties. New fast framing detectors may reveal dynamics that occur at millisecond timescales. This work demonstrates by simulation that kilohertz synchrotron CDI is possible, by making use of redundant information from static parts of the image field. Reconstruction ambiguities are strongly suppressed by applying a spatiotemporal constraint, obviating the need for slower methods of introducing ersity such as ptychography. The relationship between image fidelity and time resolution is investigated and shows that dynamics an order of magnitude faster can be reconstructed, compared with conventional CDI.
Preferred orientation and its effects on intensity-correlation measurements
Publisher: International Union of Crystallography (IUCr)
Date: 21-01-2022
DOI: 10.1107/S2052252521012422
Abstract: Intensity-correlation measurements allow access to nanostructural information on a range of ordered and disordered materials beyond traditional pair-correlation methods. In real space, this information can be expressed in terms of a pair-angle distribution function (PADF) which encodes three- and four-body distances and angles. To date, correlation-based techniques have not been applied to the analysis of microstructural effects, such as preferred orientation, which are typically investigated by texture analysis. Preferred orientation is regarded as a potential source of error in intensity-correlation experiments and complicates interpretation of the results. Here, the theory of preferred orientation in intensity-correlation techniques is developed, connecting it to the established theory of texture analysis. The preferred-orientation effect is found to scale with the number of crystalline domains in the beam, surpassing the nanostructural signal when the number of domains becomes large. Experimental demonstrations are presented of the orientation-dominant and nanostructure-dominant cases using PADF analysis. The results show that even minor deviations from uniform orientation produce the strongest angular correlation signals when the number of crystalline domains in the beam is large.
Characterization of high-resolution diffractive X-ray optics by ptychographic coherent diffractive imaging
Publisher: The Optical Society
Date: 12-10-2011
DOI: 10.1364/OE.19.021333
Bonded Multilayer Laue Lens for focusing hard X-rays
Publisher: Elsevier BV
Date: 11-2007
The Scanning Nanoprobe Beamline Nanoscopium at Synchrotron Soleil
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3625303
The XFM beamline at the Australian Synchrotron
Publisher: International Union of Crystallography (IUCr)
Date: 19-08-2020
DOI: 10.1107/S1600577520010152
Abstract: The X-ray fluorescence microscopy (XFM) beamline is an in-vacuum undulator-based X-ray fluorescence (XRF) microprobe beamline at the 3 GeV Australian Synchrotron. The beamline delivers hard X-rays in the 4–27 keV energy range, permitting K emission to Cd and L and M emission for all other heavier elements. With a practical low-energy detection cut-off of approximately 1.5 keV, low- Z detection is constrained to Si, with Al detectable under favourable circumstances. The beamline has two scanning stations: a Kirkpatrick–Baez mirror microprobe, which produces a focal spot of 2 µm × 2 µm FWHM, and a large-area scanning `milliprobe', which has the beam size defined by slits. Energy-dispersive detector systems include the Maia 384, Vortex-EM and Vortex-ME3 for XRF measurement, and the EIGER2 X 1 Mpixel array detector for scanning X-ray diffraction microscopy measurements. The beamline uses event-mode data acquisition that eliminates detector system time overheads, and motion control overheads are significantly reduced through the application of an efficient raster scanning algorithm. The minimal overheads, in conjunction with short dwell times per pixel, have allowed XFM to establish techniques such as full spectroscopic XANES fluorescence imaging, XRF tomography, fly scanning ptychography and high-definition XRF imaging over large areas. XFM provides erse analysis capabilities in the fields of medicine, biology, geology, materials science and cultural heritage. This paper discusses the beamline status, scientific showcases and future upgrades.
EIGER2 hybrid-photon-counting X-ray detectors for advanced synchrotron diffraction experiments
Publisher: International Union of Crystallography (IUCr)
Date: 21-06-2023
DOI: 10.1107/S160057752300454X
Abstract: The ability to utilize a hybrid-photon-counting detector to its full potential can significantly influence data quality, data collection speed, as well as development of elaborate data acquisition schemes. This paper facilitates the optimal use of EIGER2 detectors by providing theory and practical advice on (i) the relation between detector design, technical specifications and operating modes, (ii) the use of corrections and calibrations, and (iii) new acquisition features: a double-gating mode, 8-bit readout mode for increasing temporal resolution, and lines region-of-interest readout mode for frame rates up to 98 kHz. Ex les of the implementation and application of EIGER2 at several synchrotron sources (ESRF, PETRA III/DESY, ELETTRA, AS/ANSTO) are presented: high accuracy of high-throughput data in serial crystallography using hard X-rays suppressing higher harmonics of undulator radiation, improving peak shapes, increasing data collection speed in powder X-ray diffraction faster ptychography scans and cleaner and faster pump-and-probe experiments.
Fabrication and evaluation of variable focus X-ray lenses
Publisher: Elsevier BV
Date: 11-2007
Structural and chemical resetting processes in white mica and their effect on K-Ar data during low temperature metamorphism
Publisher: Elsevier BV
Date: 02-2021
Life history strategies of Mekong pangasiid catfishes revealed by otolith microchemistry
Publisher: Elsevier BV
Date: 05-2022
Coherent X-ray diffraction from sub-micron protein crystals
Publisher: International Union of Crystallography (IUCr)
Date: 16-08-2009
Design optimization of ultra-precise elliptical mirrors for hard X-ray nanofocusing at Nanoscopium
Publisher: SPIE
Date: 26-09-2013
DOI: 10.1117/12.2026026
Characterization of a 20-nm hard x-ray focus by ptychographic coherent diffractive imaging
Publisher: SPIE
Date: 08-09-2011
DOI: 10.1117/12.893235
Ptychographic X-ray CT characterization of the osteocyte lacuno-canalicular network in a male rat's glucocorticoid induced osteoporosis model
Publisher: Elsevier BV
Date: 12-2018
Coherent X-ray imaging of collagen fibril distributions within intact tendons
Publisher: Elsevier BV
Date: 2014
The Geometry, Spatial Distribution and Texture of Slate‐Hosted Calcite Veins in the Helvetic Flysch Units—Insights in Structural and Fluid Processes Within a Paleo‐Accretionary Complex
Publisher: American Geophysical Union (AGU)
Date: 10-2023
DOI: 10.1029/2023GC010873
Development of fast, simultaneous and multi-technique scanning hard X-ray microscopy at Synchrotron Soleil
Publisher: International Union of Crystallography (IUCr)
Date: 23-01-2013
Probing the effect of Mg doping on triclinic Na2Mn3O7 transition metal oxide as cathode material for sodium-ion batteries
Publisher: Elsevier BV
Date: 10-2021
Implementation of an analyser crystal method for x-ray diffraction tomography
Publisher: IOP Publishing
Date: 20-03-2001
Rapid and reliable diagnosis of Wilson disease using X-ray fluorescence
Publisher: Wiley
Date: 06-06-2016
DOI: 10.1002/CJP2.48
A new theoretical approach to x-ray diffraction tomography
Publisher: IOP Publishing
Date: 23-06-2000
Contrast mechanisms in scanning transmission x-ray microscopy
Publisher: American Physical Society (APS)
Date: 14-10-2009
Advances in ptychographical coherent diffractive imaging
Publisher: SPIE
Date: 28-08-2008
DOI: 10.1117/12.794186
Development of fast parallel multi-technique scanning X-ray imaging at Synchrotron Soleil
Publisher: IOP Publishing
Date: 25-10-2013
Multilayer growth in the APS rotary deposition system
Publisher: SPIE
Date: 13-09-2007
DOI: 10.1117/12.736024
Ultra-high resolution zone-doubled diffractive X-ray optics for the multi-keV regime
Publisher: The Optical Society
Date: 22-12-2010
DOI: 10.1364/OE.19.000175
A microstitching interferometer for evaluating the surface profile of precisely figured hard X-ray K-B mirrors
Publisher: SPIE
Date: 13-09-2007
DOI: 10.1117/12.736384
Zone-doubled fresnel zone plates for scanning transmission X-ray microscopy
Publisher: AIP
Date: 2010
DOI: 10.1063/1.3625337
The evolution of slate microfabrics during progressive accretion of foreland basin sediments
Publisher: Elsevier BV
Date: 09-2021
Refractive X-ray Optics made from Polymer Microstructures
Publisher: SPIE
Date: 30-04-2010
DOI: 10.1117/12.858894
Scanning transmission X-ray microscopy with a fast framing pixel detector
Publisher: Elsevier BV
Date: 08-2010
DOI: 10.1016/J.ULTRAMIC.2010.04.007
Abstract: Scanning transmission X-ray microscopy (STXM) is a powerful imaging technique, in which a small X-ray probe is raster scanned across a specimen. Complete knowledge of the complex-valued transmission function of the specimen can be gained using detection schemes whose every-day use, however, is often hindered by the need of specialized configured detectors or by slow or noisy readout of area detectors. We report on sub-50 nm-resolution STXM studies in the hard X-ray regime using the PILATUS, a fully pixelated fast framing detector operated in single-photon counting mode. We demonstrate a range of imaging modes, including phase contrast and dark-field imaging.
Comparison of two methods for simulation of hard X-ray nanofocusing by elliptical mirrors
Publisher: Elsevier BV
Date: 11-2007
Diverse migration tactics of fishes within the large tropical Mekong River system
Publisher: Wiley
Date: 02-06-2022
DOI: 10.1111/FME.12566
Abstract: Fish often migrate to feed, reproduce and seek refuge from predators and prevailing environmental conditions. As a result, migration tactics often vary among species based on a ersity of life history needs, although variation within species is increasingly being recognised as important to population resilience. In this study, within‐ and among‐species ersity in life history migratory tactics of six Mekong fish genera was examined using otolith microchemistry to explore diadromous and potamodromous traits. Two species were catadromous and one species was an estuarine resident, while the remaining three species were facultative in their migration strategies, with up to four tactics within a single species. Migrant and resident contingents co‐existed within the same species. Management, conservation and mitigation strategies that maintain connectivity in large tropical rivers, such as effective fishway design, should consider a ersity of migration tactics at the in idual level for improved outcomes.
Simple method for estimating linear attenuation coefficients from x-ray diffraction tomography data
Publisher: AIP Publishing
Date: 03-2001
DOI: 10.1063/1.1344171
Abstract: In this article, we demonstrate how the spatial distribution of x-ray linear attenuation coefficients within an object can be estimated from x-ray diffraction tomography data. The experimental arrangement to achieve this exploits a position sensitive detector and an analyzer crystal. The quality of reconstructed maps of linear attenuation coefficients is comparable to results obtained from conventional transmission computed tomography.
Hard X-ray scanning transmission microscopy with a 2Dpixel array detector
Publisher: IOP Publishing
Date: 09-2009
Coherent laser scanning diffraction microscopy
Publisher: IOP Publishing
Date: 09-2009
Biospectroscopic Imaging Provides Evidence of Hippocampal Zn Deficiency and Decreased Lipid Unsaturation in an Accelerated Aging Mouse Model
Publisher: American Chemical Society (ACS)
Date: 14-06-2018
DOI: 10.1021/ACSCHEMNEURO.8B00193
Abstract: Western society is facing a health epidemic due to the increasing incidence of dementia in aging populations, and there are still few effective diagnostic methods, minimal treatment options, and no cure. Aging is the greatest risk factor for memory loss that occurs during the natural aging process, as well as being the greatest risk factor for neurodegenerative disease such as Alzheimer's disease. Greater understanding of the biochemical pathways that drive a healthy aging brain toward dementia (pathological aging or Alzheimer's disease), is required to accelerate the development of improved diagnostics and therapies. Unfortunately, many animal models of dementia model chronic amyloid precursor protein overexpression, which although highly relevant to mechanisms of amyloidosis and familial Alzheimer's disease, does not model well dementia during the natural aging process. A promising animal model reported to model mechanisms of accelerated natural aging and memory impairments, is the senescence accelerated murine prone strain 8 (SAMP8), which has been adopted by many research group to study the biochemical transitions that occur during brain aging. A limitation to traditional methods of biochemical characterization is that many important biochemical and elemental markers (lipid saturation, lactate, transition metals) cannot be imaged at meso- or microspatial resolution. Therefore, in this investigation, we report the first multimodal biospectroscopic characterization of the SAMP8 model, and have identified important biochemical and elemental alterations, and colocalizations, between 4 month old SAMP8 mice and the relevant control (SAMR1) mice. Specifically, we demonstrate direct evidence of Zn deficiency within specific subregions of the hippoc al CA3 sector, which colocalize with decreased lipid unsaturation. Our findings also revealed colocalization of decreased lipid unsaturation and increased lactate in the corpus callosum white matter, adjacent to the hippoc us. Such findings may have important implication for future research aimed at elucidating specific biochemical pathways for therapeutic intervention.
Ptychographic X-ray computed tomography at the nanoscale
Publisher: Springer Science and Business Media LLC
Date: 09-2010
DOI: 10.1038/NATURE09419
Abstract: X-ray tomography is an invaluable tool in biomedical imaging. It can deliver the three-dimensional internal structure of entire organisms as well as that of single cells, and even gives access to quantitative information, crucially important both for medical applications and for basic research. Most frequently such information is based on X-ray attenuation. Phase contrast is sometimes used for improved visibility but remains significantly harder to quantify. Here we describe an X-ray computed tomography technique that generates quantitative high-contrast three-dimensional electron density maps from phase contrast information without reverting to assumptions of a weak phase object or negligible absorption. This method uses a ptychographic coherent imaging approach to record tomographic data sets, exploiting both the high penetration power of hard X-rays and the high sensitivity of lensless imaging. As an ex le, we present images of a bone s le in which structures on the 100 nm length scale such as the osteocyte lacunae and the interconnective canalicular network are clearly resolved. The recovered electron density map provides a contrast high enough to estimate nanoscale bone density variations of less than one per cent. We expect this high-resolution tomography technique to provide invaluable information for both the life and materials sciences.
High-efficiency zone-plate optics for multi-keV X-ray focusing
Publisher: International Union of Crystallography (IUCr)
Date: 18-03-2014
DOI: 10.1107/S1600577514003403
Abstract: High-efficiency nanofocusing of hard X-rays using stacked multilevel Fresnel zone plates with a smallest zone width of 200 nm is demonstrated. The approach is to approximate the ideal parabolic lens profile with two-, three-, four- and six-level zone plates. By stacking binary and three-level zone plates with an additional binary zone plate, the number of levels in the optical transmission function was doubled, resulting in four- and six-level profiles, respectively. Efficiencies up to 53.7% focusing were experimentally obtained with 6.5 keV photons using a compact alignment apparatus based on piezoelectric actuators. The measurements have also been compared with numerical simulations to study the misalignment of the two zone plates.
Influence of deformation and fluids on the Ti exchange in quartz
Publisher: Wiley
Date: 07-07-2021
New insights in osteocyte imaging by synchrotron radiation
Publisher: IM Publications Open LLP
Date: 16-01-2020
DOI: 10.1255/JSI.2020.A3
Abstract: Bone health depends on the bone mineral density and mechanical strength, characterised quantitatively and inferred through qualitative parameters such as the trabecular and cortical micro-architecture, and other parameters describing the bone cells. Among these cells, the osteocyte has been recognised as the orchestrator of bone remodelling, playing a key role in directing osteoblastic and osteoclastic activities. Conventional optical and electron microscopies have greatly improved our understanding of the cell physiology mechanisms involved in different osteoarticular pathophysiological contexts, especially osteoporosis. More recently, imaging methods exploiting synchrotron radiation, such as X-ray tomography, ptychography, and deep ultraviolet and Fourier transform infrared spectroscopies, have revealed new biochemical, chemical and 3D morphological information about the osteocyte lacuna, the surrounding matrix and the lacuna–canalicular network at spatial length scales spanning microns to tens of nanometres. Here, we review recent results in osteocyte lacuna and lacuna–canalicular network characterisation by synchrotron radiation imaging in human and animal models, contributing to new insights in different physiologic and pathophysiological situations.
Influence of deformation and fluids on the Ti exchange in quartz
Publisher: Wiley
Date: 28-06-2021
Status of the nanoscopium scanning nanoprobe beamline of synchrotron soleil
Publisher: SPIE
Date: 26-09-2013
DOI: 10.1117/12.2027086
Status of the Nanoscopium Scanning Hard X-ray Nanoprobe Beamline of Synchrotron Soleil
Publisher: IOP Publishing
Date: 25-10-2013
High resolution double-sided diffractive optics for hard X-ray microscopy
Publisher: The Optical Society
Date: 13-01-2015
DOI: 10.1364/OE.23.000776
Wedged multilayer Laue lens
Publisher: AIP Publishing
Date: 05-2008
DOI: 10.1063/1.2924209
Abstract: A multilayer Laue lens (MLL) is an x-ray focusing optic fabricated from a multilayer structure consisting of thousands of layers of two different materials produced by thin-film deposition. The sequence of layer thicknesses is controlled to satisfy the Fresnel zone plate law and the multilayer is sectioned to form the optic. An improved MLL geometry can be created by growing each layer with an in-plane thickness gradient to form a wedge, so that every interface makes the correct angle with the incident beam for symmetric Bragg diffraction. The ultimate hard x-ray focusing performance of a wedged MLL has been predicted to be significantly better than that of a nonwedged MLL, giving subnanometer resolution with high efficiency. Here, we describe a method to deposit the multilayer structure needed for an ideal wedged MLL and report our initial deposition results to produce these structures.
A variant on the geometrical optics approximation in diffraction enhanced tomography
Publisher: IOP Publishing
Date: 03-05-2001
Multi-Modal Scanning X-Ray Microscopy
Publisher: OSA
Date: 2009
Wood Protection for Carbon Sequestration — a Review of Existing Approaches and Future Directions
Publisher: Springer Science and Business Media LLC
Date: 19-04-2022
High-speed free-run ptychography at the Australian Synchrotron
Publisher: International Union of Crystallography (IUCr)
Date: 17-01-2022
DOI: 10.1107/S1600577521012856
Abstract: Over the last decade ptychography has progressed rapidly from a specialist ultramicroscopy technique into a mature method accessible to non-expert users. However, to improve scientific value ptychography data must reconstruct reliably, with high image quality and at no cost to other correlative methods. Presented here is the implementation of high-speed ptychography used at the Australian Synchrotron on the XFM beamline, which includes a free-run data collection mode where dead time is eliminated and the scan time is optimized. It is shown that free-run data collection is viable for fast and high-quality ptychography by demonstrating extremely high data rate acquisition covering areas up to 352 000 µm 2 at up to 140 µm 2 s −1 , with 13× spatial resolution enhancement compared with the beam size. With these improvements, ptychography at velocities up to 250 µm s −1 is approaching speeds compatible with fast-scanning X-ray fluorescence microscopy. The combination of these methods provides morphological context for elemental and chemical information, enabling unique scientific outcomes.
Inorganic compounds in the marine borer resistant timber turpentine (Syncarpia glomulifera)
Publisher: Informa UK Limited
Date: 30-06-2021
The potential for two-dimensional crystallography of membrane proteins at future x-ray free-electron laser sources
Publisher: IOP Publishing
Date: 31-03-2010
Ptychographic characterization of the wavefield in the focus of reflective hard X-ray optics
Publisher: Elsevier BV
Date: 03-2010
DOI: 10.1016/J.ULTRAMIC.2010.01.004
Abstract: A technique for quantitatively characterizing the complex-valued focal wavefield of arbitrary optics is described and applied to reconstructing the coherent focused beam produced by a reflective/diffractive hard X-ray mirror. This phase-retrieval method, based on ptychography, represents an important advance in X-ray optics characterization because the information obtained and potential resolution far exceeds that accessible to methods of directly probing the focus. Ptychography will therefore be well-suited for characterizing and aligning future nanofocusing X-ray optics.
Plastic Deformation in Profile-Coated Elliptical KB Mirrors
Publisher: Hindawi Limited
Date: 04-09-2012
DOI: 10.5402/2012/151092
Influence of Deformation and Fluids on Ti Exchange in Natural Quartz
Publisher: American Geophysical Union (AGU)
Date: 12-2021
DOI: 10.1029/2021JB022548
Abstract: Using a combination of microstructural, spectroscopic, and geochemical analyses, we investigate how subgrain rotation recrystallization and fluid migration affect Ti concentration [Ti] in naturally deformed quartz veins from the Prijakt Nappe (Austroalpine Unit, Eastern Alps). These coarse‐grained quartz veins, that formed at hibolite facies conditions, were overprinted by lower greenschist facies deformation to different degrees. During the overprint, subgrain rotation recrystallization was dominant during progressive deformation to ultramylonitic stages. The initial [Ti] (3.0–4.7 ppm) and cathodoluminescence (CL) signature of the vein crystals decrease during deformation mainly depending on the availability of fluids across the microstructure. The amount of strain played a subordinate role in resetting to lower [Ti] and corresponding darker CL shades. Using a microstructurally controlled analysis we find that the most complete re‐equilibration in recrystallized aggregates ([Ti] of 0.2–0.6 p.m.) occurred (a) in strain shadows around quartz porphyroclasts, acting as fluid sinks, and (b) in localized microshear zones that channelized fluid percolation. [Ti] resetting is mainly observed along wetted high angle boundaries (misorientation angle –15°), with partial [Ti] resetting observed along dry low angle boundaries ( –15°). This study shows for the first time that pure subgrain rotation recrystallization in combination with dissolution‐precipitation under retrograde condition provide microstructural domains suitable for the application of titanium‐in‐quartz geothermobarometry at deformation temperatures down to 300–350°C.
Synthesis, characterisation and biological evaluation of monometallic Re(i ) and heterobimetallic Re(i )/Fe(ii ) complexes with a 1,2,3-triazolyl pyridine chelating moiet
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3DT01070H
Abstract: Heterobimetallic Re( i ) ferrocene dipyridylamine complexes showed antiproliferative effects comparable to cisplatin on colon cancer cells, whereas the Re( i ) benzimidazo[1,2- a ]quinoline complex accumulated in lysosomes and interacted with biomolecules.
Tandem Probe Analysis Mode for Synchrotron XFM: Doubling Throughput Capacity
Publisher: American Chemical Society (ACS)
Date: 11-03-2022
Fabrication and characterization of highefficiency double-sided blazed X-ray optics
Publisher: The Optical Society
Date: 07-01-2016
DOI: 10.1364/OL.41.000281
Advanced methods in scanning x-ray microscopy
Publisher: SPIE
Date: 21-05-2009
DOI: 10.1117/12.821823
Coherent x-ray diffraction imaging of paint pigment particles by scanning a phase plate modulator
Publisher: IOP Publishing
Date: 19-10-2011
Related Organisations
Australian Nuclear Science And Technology Organisation
Location: Australia
Related Funding Activities
No related grants have been discovered for Cameron Kewish.