Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

31 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2, 3, 4 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I13-2-Diamond Manchester Imaging	Time resolved in-situ multi-contrast X-ray imaging of melting in metals Lorenzo Massimi , Samuel J. Clark , Sebastian Marussi , Adam Doherty , Saurabh M. Shah , Joachim Schulz , Shashidhara Marathe , Christoph Rau , Marco Endrizzi , Peter D. Lee , Alessandro Olivo Scientific Reports 12 DOI: 10.1038/s41598-022-15501-2 Diamond Proposal Number(s): [23760] Open Access Show Abstract ▼ Abstract: In this work, the application of a time resolved multi-contrast beam tracking technique to the investigation of the melting and solidification process in metals is presented. The use of such a technique allows retrieval of three contrast channels, transmission, refraction and dark-field, with millisecond time resolution. We investigated different melting conditions to characterize, at a proof-of-concept level, the features visible in each of the contrast channels. We found that the phase contrast channel provides a superior visibility of the density variations, allowing the liquid metal pool to be clearly distinguished. Refraction and dark-field were found to highlight surface roughness formed during solidification. This work demonstrates that the availability of the additional contrast channels provided by multi-contrast X-ray imaging delivers additional information, also when imaging high atomic number specimens with a significant absorption.	Jul 2022
E01-JEM ARM 200CF I13-2-Diamond Manchester Imaging	Hierarchical 2D to 3D micro/nano-histology of human dental caries lesions using light, X-ray and electron microscopy Cyril Besnard , Ali Marie , Petr Buček , Sisini Sasidharan , Robert A. Harper , Shashidhara Marathe , Kaz Wanelik , Gabriel Landini , Richard M. Shelton , Alexander Korsunsky Materials & Design 394 DOI: 10.1016/j.matdes.2022.110829 Diamond Proposal Number(s): [29256, 30666] Open Access Show Abstract ▼ Abstract: Dental caries is a widespread disease that damages teeth by heterogeneous dissolution. Conventional histology identifies different zones within carious lesions by their optical appearance, but fails to quantify the underlying nanoscale structural changes as a function of specific location, impeding better understanding of the demineralisation process. We employ detailed collocative analysis using different imaging modalities, resolutions and fields of view. Focused ion beam-scanning electron microscopy (FIB-SEM) reveals subsurface 3D nanostructure within milled micro-sized volumes, whilst X-ray tomography allows less destructive 3D imaging over large volumes. Correlative combination of these techniques reveals fine detail of enamel rods, inter-rod substance, sheaths, crystallites and voids as a function of location. The degree of enamel demineralisation within the body of the lesion, near its front, and at the surface is visualized in 3D. We thus establish the paradigm of dental 3D nano-histology as an advanced platform for quantitative evaluation of caries-induced structural modification.	Jun 2022
I13-2-Diamond Manchester Imaging	Fast in-situ synchrotron X-ray imaging of the interfacial reaction during self-propagating exothermic reactive bonding Saranarayanan Ramachandran , Yi Zhong , Stuart Robertson , Christoforos Panteli , Shuibao Liang , Fan Wu , Renqian Zhou , Shashidhara Marathe , Zhaoxia Zhou , Andrew S. Holmes , Sarah J. Haigh , Changqing Liu , Wajira Mirihanage Materialia 148 DOI: 10.1016/j.mtla.2022.101444 Diamond Proposal Number(s): [24151] Show Abstract ▼ Abstract: Self-Propagating Exothermic Reactive (SPER) bonding with lead-free solders is potentially attractive for microelectronics assembly due to its highly localised heating and minimal thermal loading of the components and substrates. The transient dynamics of melting, wetting, solidification and defect formation during SPER bonding were observed using in-situ synchrotron X-ray imaging with sub-millisecond temporal resolution and the results were further analysed using electron microscopy and thermal modelling. In-situ imaging revealed the preferential melting of the solder and subsequent wetting of the substrate. Numerous air bubbles were observed to form at the bonding interface. The distribution of these bubbles was found to vary with the thermal conductivity and wettability of the substrates. These bubbles appear to reduce the effectiveness of bonding by promoting the formation of cracks and voids within the solder joint. Our results show that metallisation layers on the bonding substrate can influence the dynamics of melting for the solder materials and thereby directly influence the reliability of SPER interconnects.	Apr 2022
I13-2-Diamond Manchester Imaging	Application of X-ray microcomputed tomography for the static and dynamic characterization of the microstructure of oleofoams Lorenzo Metilli , Malte Storm , Shashidhara Marathe , Aris Lazidis , Stephanie Marty-Terrade , Elena Simone Langmuir DOI: 10.1021/acs.langmuir.1c03318 Diamond Proposal Number(s): [24233, 25431] Open Access Show Abstract ▼ Abstract: Oleofoams are a novel, versatile, and biocompatible soft material that finds application in drug, cosmetic or nutraceuticals delivery. However, due to their temperature-sensitive and opaque nature, the characterization of oleofoams’ microstructure is challenging. Here, synchrotron X-ray microcomputed tomography and radiography are applied to study the microstructure of a triglyceride-based oleofoam. These techniques enable non-destructive, quantitative, 3D measurements of native samples to determine the thermodynamic and kinetic behavior of oleofoams at different stages of their life cycle. During processing, a constant bubble size distribution is reached after few minutes of shearing, while the number of bubbles incorporated keeps increasing until saturation of the continuous phase. Low amounts of solid triglycerides in oleofoams allow faster aeration and a more homogeneous microstructure but lower thermodynamic stability, with bubble disproportionation and shape relaxation over time. Radiography shows that heating causes Ostwald ripening and coalescence of bubbles, with an increase of their diameter and sphericity.	Jan 2022
I13-2-Diamond Manchester Imaging	Optimizing the energy bandwidth for transmission full-field X-ray microscopy experiments Malte Storm , Florian Doring , Shashidhara Marathe , Silvia Cipiccia , Christian David , Christoph Rau Journal Of Synchrotron Radiation 29 DOI: 10.1107/S1600577521011206 Open Access Show Abstract ▼ Abstract: Full-field transmission X-ray microscopy (TXM) is a very potent high-resolution X-ray imaging technique. However, it is challenging to achieve fast acquisitions because of the limited efficiency of the optics. Using a broader energy bandwidth, for example using a multilayer monochromator, directly increases the flux in the experiment. The advantage of more counts needs to be weighed against a deterioration in achievable resolution because focusing optics show chromatic aberrations. This study presents theoretical considerations of how much the resolution is affected by an increase in bandwidth as well as measurements at different energy bandwidths (ΔE/E = 0.013%, 0.27%, 0.63%) and the impact on achievable resolution. It is shown that using a multilayer monochromator instead of a classical silicon double-crystal monochromator can increase the flux by an order of magnitude with only a limited effect on the resolution.	Dec 2021
I13-2-Diamond Manchester Imaging	Dynamic multicontrast X-ray imaging method applied to additive manufacturing Lorenzo Massimi , Samuel J. Clark , Sebastian Marussi , Adam Doherty , Joachim Schulz , Shashidhara Marathe , Christoph Rau , Marco Endrizzi , Peter D. Lee , Alessandro Olivo Physical Review Letters 127 DOI: 10.1103/PhysRevLett.127.215503 Diamond Proposal Number(s): [23760] Show Abstract ▼ Abstract: We present a dynamic implementation of the beam-tracking x-ray imaging method providing absorption, phase, and ultrasmall angle scattering signals with microscopic resolution and high frame rate. We demonstrate the method’s ability to capture dynamic processes with 22-ms time resolution by investigating the melting of metals in laser additive manufacturing, which has so far been limited to single-modality synchrotron radiography. The simultaneous availability of three contrast channels enables earlier segmentation of droplets, tracking of powder dynamic, and estimation of unfused powder amounts, demonstrating that the method can provide additional information on melting processes.	Nov 2021
I13-1-Coherence I13-2-Diamond Manchester Imaging Data acquisition	Operando and high-throughput micro and nano-tomography Christoph Rau , Shashidhara Marathe , Andrew J. Bodey , Malte Storm , Darren Batey , Silvia Cipiccia , Peng Li , Ralf F. Ziesche , Mohamed Al-Hada , Sven L. M. Schroeder , Gunjan Das , Anjali Goswami SPIE Optical Engineering + Applications, 2021 DOI: 10.1117/12.2598470 Open Access Show Abstract ▼ Abstract: We report about multiscale tomography with high throughput at the Diamond beamline I13L. The beamline has the purpose of multi-scale and operando imaging and consists of two independent branchlines operating in real and reciprocal space. The imaging branch -called Diamond-Manchester branchline- hosts micro-tomography, grating interferometry and a full-field microscope. For rapid recording a broad spectrum of the undulator radiation is used either with band-passing the light with a combination of a filter and a deflecting mirror or using a multilayer monochromator. For all the methods similar recording times can be achieved, with typical scanning times of some minutes and covering the resolution range from microns to the 100nm range. Most recently a robot arm has been installed to increase the throughput to 300 samples per day. The system is now implemented for user operation in remote operation mode for the micro-tomography setup and can be expanded to the two other experiments. The instrumental capabilities are applied on various topics such as the study of biodiversity of insects or the structural variations of electrode materials in batteries. Fast recording with dedicated sample environments (not using the sample changing robot) enables operando studies in many areas, the charging/discharging cycles on batteries, the degradation of teeth enamel under various conditions or loading brine sandstone mixtures with CO2, to name some examples. For imaging with highest spatial resolution we managed to improve significantly the recording speed of ptycho-tomography, which is now in the order of hours and will be reduced further. We demonstrated in the past 2-D recording with 10kHz and expand the instrumental capability with specific hardware dependent triggering and scanning schemes. We expand the research program for multi-scale imaging across both branchlines (imaging and coherence branchlines) with first studies such as batteries, brain research, concrete.	Oct 2021
I13-2-Diamond Manchester Imaging	High-speed grating interferometry Shashidhara Marathe , Ralf F. Ziesche , Gunjan Das , Sven L. M. Schroeder , Emily Baird , Christoph Rau SPIE Optical Engineering + Applications, 2021 DOI: 10.1117/12.2598481 Open Access Show Abstract ▼ Abstract: We present the most recent advances in fast X-ray grating interferometer and their applications. A dedicated setup for rapid scanning with a single grating and using filtered broadband illumination of an undulator source has been implemented. With this setup tomographic scans can be achieved within minutes. Larger number of samples can be measured and chemical processes can be studied. Improvements in the data processing technique will be presented. We will also describe the new capabilities and applications.	Oct 2021
I13-2-Diamond Manchester Imaging	Mechanisms of gas and shrinkage porosity formation in solidifying shear bands Shishira Bhagavath , Zhixuan Gong , Tim Wigger , Saurabh Shah , Bita Ghaffari , Mei Li , Shashidhara Marathe , Shyamprasad Karagadde , Peter D. Lee Journal Of Materials Processing Technology 26 DOI: 10.1016/j.jmatprotec.2021.117338 Diamond Proposal Number(s): [22053] Show Abstract ▼ Abstract: In specialised solidification processing techniques such as High Pressure Die Casting, Twin-Roll Casting and others, an additional external deformation load is applied to achieve the required shape, leading to the formation of microstructural features such as shear bands. The mechanism for forming these features is believed to be dependent on dynamically evolving strain fields, which are dependent on the local solid fraction, applied strain rates and casting geometry. To investigate this, a semisolid ( 50 % solid fraction) Al-10 wt.% Cu alloy is isothermally injected into a bespoke die using a custom-designed thermo-mechanical rig. The semisolid deformation, formation of Cu-rich dilatant bands and subsequent pore nucleation and growth are captured using fast synchrotron X-ray radiography. The local normal and shear strains acting on the mush are quantified using Digital image correlation to identify the dilatant shear bands and the dominant local strain component. Correlating the radiographs with strain maps reveals that gas pores within the dilated interstices grow, while those in compressed regions are squeezed out. A linear correlation between accumulated volumetric strain and porosity volume fraction demonstrates that higher dilations give rise to a local increase in both gas and shrinkage porosity.	Aug 2021
I13-2-Diamond Manchester Imaging	Operando synchrotron imaging of electrolyte distribution in silver-based gas diffusion electrodes during oxygen reduction reaction in highly alkaline media Melanie Cornelia Paulisch , Marcus Gebhard , David Franzen , Andre Hilger , Markus Osenberg , Shashidhara Marathe , Christoph Rau , Barbara Ellendorff , Thomas Turek , Christina Roth , Ingo Manke Acs Applied Energy Materials DOI: 10.1021/acsaem.1c01524 Diamond Proposal Number(s): [21813] Show Abstract ▼ Abstract: Understanding how gas diffusion electrodes are working is crucial to improve their performance and cost efficiency. One key issue is the electrolyte distribution during operation. Here, operando synchrotron imaging of the electrolyte distribution in silver-based gas diffusion electrodes is presented. For this purpose, a half-cell compartment was designed for operando synchrotron imaging of chronoamperometric measurements. For the first time, the electrolyte distribution could be analyzed in real time (1 s time resolution) even in individual pores as small as a few micrometers. The detailed analyses of dynamic filling processes are an important step for understanding and improving electrodes.	Jul 2021

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User