Transmission Electron Microscopy

Sciau, Ph.

doi:10.1016/bs.aiep.2016.09.002

Cited by 17 publications

(5 citation statements)

References 55 publications

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“…Focused ion beam. Thin sections suited for TEM investigation were prepared using the 'Lift-out' technique (Sciau et al, 2009;Sciau, 2016) in a Helios NanoLab 600i dual beam (Thermofisher) equipped with a Ga ion source. This preparation method was chosen to enable a precise selection of the areas of interest thanks to the backscattered electron detector.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Transmission electron microscopy (TEM) is perfectly suited to reach such scales and precisely characterize complex nanometric structures (Sciau, 2016). Its inherent coupling with electron diffraction and the possibility to implement energydispersive spectroscopy (EDS) allows both crystallographic and elemental characterizations at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

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Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Holé,

Brunet,

Joulié

et al. 2024

J Appl Crystallogr

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Black-to-brown Chinese ceramics have sparked the interest of material scientists since the widespread discovery of complex dendritic structures containing mainly the rare ɛ-Fe2O3 polymorph in their glazes. This study proposes to tackle this issue using two electron diffraction mapping techniques, transmission Kikuchi diffraction and automated crystal orientation mapping–precession electron diffraction, which have not been fully exploited despite their relevance for studying these structures at the scales of interest. It first demonstrates the efficiency of applying these techniques to characterize the structures at the nanoscale and discusses some limitations that may be encountered, in particular due to the specificity of heritage samples. It then focuses on the crystalline orientations obtained with these techniques, which highlight epitaxial relationships among the crystalline planes (001) of the ɛ-Fe2O3 phase, (0001) of the hematite and (111) of the spinel. Finally, it discusses the growth of such complex multi-phase structures by proposing two possible mechanisms, one based on the transformation of ɛ-Fe2O3 into hematite and spinel, and the other based on the growth of hematite and spinel on already crystallized ɛ-Fe2O3 dendrites. It also compares the dendritic structures of the two modern samples with those found in an ancient sample of Jian ware.

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Holé,

Brunet,

Joulié

et al. 2024

J Appl Crystallogr

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“…SEM scans the surface of the sample and creates an image detecting the reflected electrons, while TEM uses transmitted electrons that create the image by passing through a thin sample. SEM provides information on the surface of the sample at macro-and micro-scales, whereas TEM provides details of the inner structure of the sample at the nanoscale [135,136].…”

Section: Characterizing Ha Crystalsmentioning

confidence: 99%

The “Forgotten” Hydroxyapatite Crystals in Regenerative Bone Tissue Engineering: A Critical Review

Tzavellas,

Katrilaka,

Karipidou

et al. 2024

Crystals

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Bone regeneration using Bone Morphogenetic Proteins (BMPs) alongside various engineered scaffolds has attracted considerable attention over the years. The field has seen extensive research in preclinical animal models, leading to the approval of two products and guiding the quest for new materials. Natural and synthetic polymers, ceramics, and composites have been used to fabricate the necessary porous 3D scaffolds and delivery systems for BMPs. Interestingly, all reported applications in the literature are triumphant. Evaluation of the results is typically based on histologic assessment after appropriate staining and radiological modalities, providing morphological identification of the newly formed bone and describing cells and the organic compound. Remarkably, while these evaluation methods illustrate mineralization, they are not capable of identifying hydroxyapatite crystals, the mineral component of the bone, which are crucial for its mechanical properties, structure, integrity, and long-term stability of regenerated bone tissue. This review aims to focus on the different scaffolds used in bone tissue engineering applications and underline the pressing need for techniques that could recognize the presence of hydroxyapatite crystals as well as their characteristics in bone tissue engineering, which will provide a more complete and comprehensive assessment of the successful results.

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“…The TEM mode that is commonly used in the field of cultural heritage is the bright-field (BF) imaging method. In this case, areas including elements of higher atomic numbers are presented darker, compared with the ones that contain lighter elements [65].…”

Section: Tem Analysismentioning

confidence: 99%

Scanning Microscopy Techniques as an Assessment Tool of Materials and Interventions for the Protection of Built Cultural Heritage

et al. 2019

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Scanning microscopy techniques have emerged as powerful scientific tools for analysing materials of architectural or archaeological interest, since the commercialization of the first scanning electron microscopy instrumentation in the early 60s. This study is aimed at reviewing and highlighting the significance of several scanning microscopy techniques employed in the protection of built heritage. The diffusion of scanning electron microscopy with energy-dispersive X-ray spectroscopy analysis (SEM-EDX) is proven to be the widest among the available scanning microscopy techniques, while transmission electron microscopy (TEM) applications are steadily present in the field of built heritage protection. The building material characterization, the weathering mechanism investigation, and the development of compatible and performing conservation materials are some major research areas where the application of the aforementioned techniques is discussed. The range of techniques, along with aspects of instrumentation and sample preparation are, also, considered.

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Transmission Electron Microscopy

Cited by 17 publications

References 55 publications

Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

The “Forgotten” Hydroxyapatite Crystals in Regenerative Bone Tissue Engineering: A Critical Review

Scanning Microscopy Techniques as an Assessment Tool of Materials and Interventions for the Protection of Built Cultural Heritage

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Transmission Electron Microscopy

Cited by 17 publications

References 55 publications

Study of the epitaxy between ɛ-Fe2O3, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Study of the epitaxy between ɛ-Fe2O3, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

The “Forgotten” Hydroxyapatite Crystals in Regenerative Bone Tissue Engineering: A Critical Review

Scanning Microscopy Techniques as an Assessment Tool of Materials and Interventions for the Protection of Built Cultural Heritage

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Product

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Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques

Study of the epitaxy between ɛ-Fe₂O₃, hematite and spinel in brown-glazed Chinese ceramics using electron diffraction mapping techniques