Science method
Transmission Electron Microscopy (TEM) - Science method
Transmission Electron Microscopy is a microscopic technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it passes through. An image is formed from the interaction of the electrons transmitted through the specimen; the image is magnified and focused onto an imaging device, such as a fluorescent screen, on a layer of photographic film, or to be detected by a sensor such as a CCD camera.
Publications related to Transmission Electron Microscopy (TEM) (10,000)
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Preparation of an Al-Ni alloy for transmission electron microscopy (TEM) by focused ion beam (FIB) milling using Ga+ ions induced phase transformations, risking misinterpretation: from FCC Al-Ni solid solution to FCC Al-Ni and orthorhombic Al3Ni phases. Upon milling a nanolaminated Al95Ni5 - AlOx thin film with Ga+ ions, local Ga segregations of up...
Early-stage oxide phase formation during air oxidation of Co-Cr-Fe-Mn-Ni-Si complex concentrated alloys is investigated in-situ using synchrotron grazing incidence X-ray diffraction. The first detected oxide phase as well as the order of oxide phase formation during the first hour of oxidation between 400 °C and 800 °C are clarified for alloys with...
We report on the effect of silver doping on the microstructure of Cantor alloy thin films deposited by magnetron
co-sputtering. The introduction of silver, with its higher enthalpy of mixing exceeding the thermodynamic criterion for stable solid solutions, promotes the coexistence of a crystallized silver face-centered cubic (fcc) phase
alongside t...
High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the sur...
This study evaluated the monoclinic angle of the B19′ martensite in a cold worked equiatomic Ni 50 Ti 50 alloy by means of transmission electron microscopy (TEM) analysis. It also presents a minimum error approach to determining the small changes to the monoclinic angle based on Fast Fourier Transformation patterns generated from high resolution TE...
14 Single crystal MgAl2O4 requires ultra-precision machining to achieve satisfactory 15 dimensional accuracy and surface quality due to its high hardness and brittleness. To 16 investigate the effect of multi-abrasive scratch sequences on the material removal and 17 deformation mechanism of single crystal MgAl2O4 in ultra-precision machining. 18 Mu...
Grains of commercially pure titanium (CP-Ti) can be refined via rotary-die equal-channel angular pressing (RD-ECAP) to meet higher application requirements. However, the grain refinement mechanism of CP-Ti during RD-ECAP has not been fully studied. Herein, CP-Ti was processed up to four passes by RD-ECAP to obtain an ultrafine-grained structure. Th...
The mechanism of critical current density (Jc) enhancement in rapid heating, quenching and transformation (RHQT) Nb3Al wires with nanoparticles was investigated from microscopic defects. As shown in transmission electron microscopy results, the stacking faults (SF) density in RHQT Nb3Al could be improved by incorporating nano-oxide particles, becau...
For cryogenic systems, the development of superconducting interconnects is nowadays essential to reach large-scale integration schemes while addressing the associated challenges of signal dispersion and cross talk as well as thermal management. To achieve interconnects with micrometer and potentially sub-micrometer pitches, we investigate wafer-to-...
Carbon dots (CDs) derived from biomass are promising fluorescent probes for specific analyte detection due to their specificity, biocompatibility, selectivity, and sensitivity. In this work, carbon dots were prepared hydrothermally from natural material, Myrica esculenta fruits (hereafter referred to as MPCDs), without adding any chemicals. The pre...
Diverse, multi-stage phase transformations occur in many materials under extreme environments. In response to irradiation, some MAX phase compositions transform from an initial hexagonal structure to an intermediate γ-phase, then to a face-centered cubic (fcc) structure, while others instead become amorphous. To date, no comprehensive description o...
Phase reconstruction is important in transmission electron microscopy for structural studies. We describe electron Fourier ptychography and its application to phase reconstruction of both radiation-resistant and beam-sensitive materials. We demonstrate that the phase of the exit wave can be reconstructed at high resolution using a modified iterativ...
A series of hybrid composite membranes including polymer‐metal‐organic frameworks (MOFs), are synthesized using sulfonated Fe‐MOF and sulfonated polytriazole (PTSF). After being post‐modified by 1,3‐propane sultone, the obtained Fe‐S MOF is incorporated into the polytriazole polymer matrix through the solution blending method. Additionally, a serie...
Processing human cells for transmission electron microscopy analysis.
This study aimed to explore the impact of annealing temperature on the nucleation and subsequent growth of nanocrystalline α-Fe grains in a high saturation magnetization soft magnetic Fe84.8Si0.5B9.4P3.5Cu0.8C1.0 alloy. Thus, we conducted multiprobe analyses of the isothermal crystallization process within 633–733 K. Transmission electron microscop...
The transient electromagnetic method (TEM) is widely used in geophysical exploration. In TEM data interpretation, nonlinear inversion plays an important role. However, traditional TEM nonlinear inversion adopts the OCCAM imaging method, which merely presents the approximate shape of the stratum model, with poor inversion accuracy and much iteration...
Heterostructures of covalent semiconductors provide an invaluable platform for synthesizing the distinct properties of materials, leading to unprecedented functions in electronic and optoelectronic devices. The main challenge has been to forge high-quality interfaces of the heterostructures that guarantee the designed properties. To date, high-qual...
In-situ transmission electron microscopy (TEM) studies reveal key insights into the structural and chemical evolution of nanoparticles (NPs) under external stimuli like heating and biasing, which is critical for evaluating their suitability in chemical reactions and their tendency towards forming novel NP systems. In this study, starting from a cor...
Invar alloy has a wide range of applications in aerospace and precision instruments. However, the microstructure evolution during rapid solidification is not yet fully understood. In this study, the rapid solidification microstructure of Invar alloy with undercooling ranging from 5 K to 231 K was investigated using optical microscopy, EBSD, and TEM...
This study assesses the antimicrobial, antibiofilm, and antiurease properties of selenium (Se), zinc (Zn), and zinc selenide (ZnSe) nanoparticles (NPs) against clinically pathogenic strains of Streptococcus salivarius and Proteus mirabilis. The Se, Zn, and ZnSe NPs, synthesized by Pseudomonas aeruginosa OG1, were characterized using transmission el...
The evolution of Al3(Sc, Zr) and α-Al(Fe, Mn)Si dispersoids and their influence on the recrystallization behavior and mechanical properties of an Al–Mg–Sc alloy under various homogenization and annealing treatments were investigated by scanning electron microscopy, transmission electron microscopy and tensile testing. The results revealed that the...
Micron‐sized SiO‐based materials have attracted extensive attention in lithium‐ion batteries due to high theoretical capacity and low‐cost. However, their development is seriously hampered by the large volume change and low conductivity of SiO. Herein, by combining the theoretical prediction with biomimetics‐driven design concept, a unique chloropl...
Dehydration of serpentine is an important prograde metamorphic reaction within the lithosphere and subduction zones, potentially causing profound changes in rock properties. Imaging these transitions in real time provides direct insight into the process. We have used in-situ transmission electron microscopy (TEM) to continuously monitor nanoscale t...
The present study investigates the irradiation hardening in pure Fe and Fe-0.3 wt.% Si alloys after He+ ion implantation tests in order to obtain a representative value for the barrier strength (α-value) of helium bubbles in model ferritic alloys. 160 keV He+ ion implantation was performed at 400 ± 2 ℃ with a fluence up to 3.6 × 1016 cm-2 at a flux...
In this study, we combined x-ray topography (XRT) and birefringence imaging to identify the Burgers vectors in threading mixed dislocations (TMDs) in SiC. XRT was utilized to determine the screw components of the Burgers vectors, while the edge components were ascertained using birefringence images obtained by polarized light microscopy. Our analys...
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Transition element microalloying is important for improving the properties of Al-Zn-Mg-Cu alloys. Nevertheless, along with its high costs, increasing Sc content generates a harmful phase, limiting the strength of the alloy. In this experiment, we reduced the amount of Sc added to a Zr-containing Al-Zn-Mg-Cu alloy by one order of magnitude. The micr...
In this present communication, we have synthesized the Bi2S3-xC dots (x = 0, 0.03, 0.06, 0.13, 0.27, 0.67 and 1.0) nanocomposite samples by using low temperature hydrothermal method. The XRD measurements confirmed the phase purity and nanocomposite nature of the synthesized samples. FESEM and TEM measurements confirmed that, Bi2S3 samples have rod...
Bismuth titanate (BTI) nanoparticles were synthesized via hydrothermal method. The XRD spectra show that the maximum intense peaks are associated to orthorhombic Bi4Ti3O12, and the pH did not show any significant effect on the structural transformation. The X‐ray photoelectron spectrum (XPS) of BTI nanoparticles clearly shows the presence of elemen...
The magnetic skyrmion in two-dimensional van der Waals (vdW) ferromagnetic materials offer a feasible and robust platform for future spintronic applications, thanks to their atomic-scale interface and stacking structure. Recently, a room temperature vdW ferromagnet Fe3GaTe2 (FGT) has been discovered, in which skyrmion lattice can be generated. In t...
In recent years, significant progress in thermoelectric module (TEM) technology has been achieved in terms of both flexibility and efficiency. This has created great application potential for it, including in cooling garments. In this paper, the results from performance tests of six selected flexible TEMs are presented and discussed in terms of the...
Acredito que o nobre leitor já tenha ouvido ou lido o seguinte ditado ligado ao povo judeu: “onde há dois judeus, se têm três opiniões e quatro partidos políticos”. Ao pesquisar as diferentes versões sobre a sua origem, identifiquei que a correta (a fiel) é a que deriva da interpretação de um trecho do Livro de Ester (3:8), até pelo fato de ser a o...
Pt–SnO2 composite nanoceramics recently have drawn much attention for their strong responses to CO at room temperature and a remarkable long-term stability. To further improve their microstructure and performance, in this study, a solution reduction Pt-loading method was used to deposit Pt nanoparticles (~ 5 nm) on SnO2 nanoparticles, from which Pt...
The objective of this study is to analyze the protein composition of extracellular vesicles (EVs) isolated from the serum of ankylosing spondylitis (AS) patients to identify potential biomarkers that could enable the early diagnosis and intervention of this condition. Serum samples were collected from AS patients and healthy controls. EVs were isol...
Dislocations in functional oxides have sparked interest in the potential they hold for harvesting both enhanced mechanical and functional properties for next-generation electronic devices. This has motivated the recent research endeavor to achieve tunable dislocation density and plastic zone size in functional oxides. However, the dislocation densi...
Organic-pillared vermiculite was applied as the support to fabricate Ru catalyst via adsorption-precipitation method. The catalytic performances of the catalyst were investigated for the selective hydrogenation of levulinic acid (LA) or methyl levulinate (ML) to γ-valerolactone (GVL). The 100% selectivity of GVL and 100% conversion of LA were obtai...
Age-hardenable Al-Mg-Si alloys are highly sought-after engineering materials, yet their precipitation behavior lacks direct and accurate quantification. Here, we carried out a small angle neutron scattering (SANS) study on a typical Al-Mg-Si alloy with varying aging conditions, complemented by site-specific transmission electron microscopic (TEM) a...
The spike protein (SP) of SARS-CoV-2 is the major molecular target for making diagnostic tests, vaccines, and therapeutic development. We used a combination of transmission electron microscopy (TEM) and surface enhanced Raman microscopy (SERS) to study its structure. Using SERS on an aluminum substrate, we were able to detect a characteristic spect...
Design of efficient metal-acid bifunction catalysts is of significance for development of hydroisomerization of linear alkanes. In this study, the spatial configurational construction of Pt-ZSM-5 catalytic system was achieved by fabrication of acidic ZSM-5 zeolite and mesoporous silica core-shell composites equipped with controlled location of Pt s...
Helically corrugated waveguides are valuable for constructing high-performance gyrotron devices and high-power pulse compressors. This paper establishes a theoretical model to analyze the dispersion characteristics of helically corrugated coaxial waveguides, where the dispersion equations for solving the propagation constants of coupled eigenmodes,...
The traditional source uses a square wave with a fixed fundamental frequency to excite transient electromagnetic (TEM) fields, with harmonic energy primarily concentrated in the low-frequency range, limiting the detection resolution of the TEM. The differential pulse, composed of two square waves with identical pulse widths but opposite polarities,...
Industrial pure titanium was processed through 1–4 passes by equal-channel angular pressing (ECAP), and the processed samples were subsequently short-term annealed for 15 min at 300 °C, to achieve better mechanical properties for industrial applications. The microstructure was analyzed using TEM, EBSD, and XRD observations. The mechanical propertie...
Mercury (Hg) exposure is a possible risk factor for Alzheimer´s disease (AD), and some studies have found higher Hg levels in AD patients. Yet, the evidence is inconclusive, and a mechanism linking Hg exposure to AD neuropathology remains to be found. The hallmark of AD brains is deposits of insoluble amyloid plaques consisting mainly of aggregated...
One of the major goals of solar-pumped lasers is to improve ${{\rm TEM}_{00}}$ -mode collection and conversion efficiencies. Several studies have explored multi-rod designs with the aim of enhancing laser output and thermal management by distributing the absorbed solar energy across multiple rods. In this work, we introduced a concept comprising fo...
We present a method for computing angle-resolved electron energy loss and gain spectroscopies for phonon and magnon excitations in transmission electron microscopy. Fractional scattering intensities are derived from the temperature-dependent time autocorrelation of the auxiliary electron beam wave function. This method captures both single and mult...
In this paper, the microstructure changes of an Al–6.8Zn–2Mg–2Cu–0.1Zr–0.2Sc alloy for shipbuilding under different T6 states were investigated. The effect of aging temperature on the electrochemical corrosion behavior of the alloy was analyzed by means of SEM, EDS, and TEM, and the corrosion mechanism was revealed. The results show that the bean-s...
After being self-ion implanted at 400 °C and 550 °C, the microstructure and irradiation hardness of kilogram-scale V-4Cr-4Ti alloys were studied using a transmission electron microscope (TEM) and nano-indentation test technology. Irradiation was performed using self-ions (V2+) at 2.5 MeV with design influences of 1.15 × 1015 ions cm−2, 4.59 × 1015...
We report the synthesis of multiple Bi2Te3 shells on multi-stepped Sb2Te3 nanoplates using molecular beam epitaxial (MBE) step-edge growth. For the growth of Bi2Te3/Sb2Te3 hetero-structures, multi-stepped Sb2Te3 nanoplates with stair-like morphology following layer-by-layer growth mode were obtained by optimizing the growth temperature, and the gro...
Metal-doped ZIF-67 (M-Z, M = Ni, Cu) was prepared by liquid phase precipitation method, and its microstructure, crystal structure, and specific surface area were determined by characterization methods such as SEM, TEM, FTIR, XRD, XPS, BET, etc. SEM and TEM images show that M-Z is a regular dodecahedron, maintaining the basic morphology of ZIF-67. F...
The catalytic conversion of CH4 by O2 into syngas (known as partial oxidation of methane; POM) is a practical approach for depleting CH4 concentration as well as achieving excellent H2 yield with high H2/CO ratio. The pentasil zeolite family having different SiO2/Al2O3 ratios 10, 20, 25, and 30 (abbreviated as CBV10A, CBV20A, CP810E, and CBV3024E)...
Y2O3-coated MgO: Ce+3 particles with different precipitants were prepared by the co-precipitation method; the phase and morphology of the sample were characterized by XRD, TEM, and DTA-TG, and the apparent activation energy of the coated particles was studied by thermal analysis kinetics. The results showed that the precursors synthesized by single...
The sensitive and rapid detection of n-butanol gas is crucial for ensuring industrial safety, environmental protection, and biological health. In this study, we employed electrospinning to fabricate a series of CuBi2O4 nanofibers and nanotubes, followed by thorough characterization and analysis of their structural and functional features using XRD,...
The objective of this work was to develop a highly active hydrotreating catalyst for processing heavy gas oil to provide qualified feedstock for hydroisomerization or a hydrocracking unit. The NiMo/γ-Al2O3 catalysts doped with phosphate were prepared by introducing two kinds of additives, and the influencing factors for highly active hydrodenitroge...
This study investigates the influence of various heat treatment regimes on the structure and microhardness of the aluminum alloy AlSi10Mg processed by the L-DED method. The study considers heat treatment regimes for solid solution in the temperature range of 500−540 °C with holding times of 30–120 min, as well as artificial aging regimes in the tem...
Skyrmions can form regular arrangements, so-called skyrmion crystals (SkXs). A mode with multiple wavevectors q then describes the arrangement. While magnetic SkXs, which can emerge in the presence of Dzyaloshinskii–Moriya interaction, are well established, polar skyrmion lattices are still elusive. Here we report the observation of polar SkXs with...