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• W3012535261 abstract "Catalysts and other functional materials are generally hierarchically structured materials. Hence, the detailedcharacterization at different length scales, and especially under reaction conditions, are necessaryto unravel their mechanisms and to improve their performance and catalytic activities. Besides, a combinationof several techniques is required to acquire complementary information owing to the lack of asingle technique able to cover all the length scales. With respect to length, the best way to investigate isby microscopy either in 2D or more preferably in 3D. The work began with an exploration of three different3D imaging techniques, i.e. ptychographic X-ray computed tomography, electron tomography, andfocused ion beam slice-and view. Using nanoporous gold as the model, this study aimed to exhibit theversatility of 3D microscopy as a method beyond imaging as well as to confirm the necessity of complementarynature between them, where electron offers better spatial resolution and X-ray provides largerfield of view. The study then continued by utilizing ptychographic X-ray computed tomography for quasiin situ thermal treatment of the same materials under atmospheric pressure. This study highlighted itsease of use of implementing in situ studies, complemented by electron tomography to prove its powerfulability to resolve what ptychographic tomography cannot. The resulting 3D volumes were then used forair permeability and CO2 diffusion simulations, along with material’s electrical and thermal conductivitysimulations in order to further expose another excellent benefit from 3D microscopy. Ultimately, the workproceeded into developing two cells in order to perform full in situ investigations under controlled temperaturesand atmospheres, where one cell was built for 2D only (X-ray) ptychography experiments withsimultaneous X-ray fluorescence mapping, and the other was constructed with an additional capabilityfor 3D limited-angle ptychographic tomography experiments. The feasibility tests were conducted usingseveral functional materials, i.e. nanoporous gold, zeolite, and cobalt-manganese-oxides hollow sphere,as the models for thermal annealing process under specific atmospheres. This work eventually attests theimportance of in situ studies in precisely determining the onset annealing temperatures under particularenvironments, to visualize the morphology online either in 2D or 3D, and to simultaneously map elementaldistributions live. Moreover, a complementary technique via transmission electron microscopywas also demonstrated on the same sample, adding up another advantage in using the cells. Despite thepreliminary results from in situ limited-angle ptychographic tomography experiments for limitation in datareconstruction, a new tomographic reconstruction technique was recently developed as a solution to acquire3D images with shortened acquisition times. In conclusions, the work here converges into the idealcase of performing all-around in situ 3D imaging of functional materials for quantitative analysis and simulation." @default.
• W3012535261 created "2020-03-23" @default.
• W3012535261 creator A5091355627 @default.
• W3012535261 date "2020-01-01" @default.
• W3012535261 modified "2023-09-23" @default.
• W3012535261 title "Complementary 2D/3D Imaging of Functional Materials using X-ray & Electron Microscopy" @default.
• W3012535261 doi "https://doi.org/10.5445/ir/1000106000" @default.
• W3012535261 hasPublicationYear "2020" @default.
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