Tuning the metal insulator transition (MIT) behavior of VO2 film through interfacial strain is effective for practical applications. However, mechanism strain-modulated MIT still under debate. Here we directly record dynamics ultrathin on TiO2 substrate and reveal intrinsic modulation process by means synchrotron radiation first-principles calculations. It observed that obtained films can be modulated continuously via strain. The relationship between phase temperature evolution established...

Theoretical simulations and interpretations of x-ray-absorption near-edge data at the Ti O K edges in titanium oxides, rutile, anatase, have been performed framework full multiple scattering theory a tight-binding linear muffin-tin orbital band-structure method. Good agreement between experimental theoretical calculations is obtained, especially preedge region K-edge spectrum which interpreted terms mixing central 4p neighboring 3d orbitals octahedral coordination. It concluded that...

Sulfur K-edge x-ray-absorption spectra have been recorded for lithium intercalated titanium disulfides ${\mathrm{Li}}_{x}{\mathrm{TiS}}_{2}$. The near-edge features up to 30 eV above threshold are interpreted in the framework of full multiple-scattering theory. We show that electrons transferred from atoms not only located on Ti $3d$ orbitals, as previously assumed, but also S $3p$ states. For comparison, we present $p$-projected density states derived linear muffin-tin-orbital band...

Recently taking advantage of the novel diffraction-enhanced imaging (DEI) method, one very effective and practical phase contrast technique—a new x-ray computed tomography scheme based on DEI (DEI-CT) showed promising results, really superior to those conventional CT imaging. In this letter, we show that application reconstruction algorithm is not always satisfactory for DEI-CT a mathematical framework presented. Experimental data collected at Beijing synchrotron radiation facility are also...

Soft x-ray detectors play crucial roles in biology, chemistry, and lithography. Current soft suffer from insufficient responsivity (R), excessively large cell area, limited stability. Here, the β-Ga2O3 detector is constructed, effects of varying sensitive layer thickness voltage on detection characteristics device are explored. Meanwhile, mechanism multiplication ionization process photoconductivity gain photoresponse performance analyzed. The obtains R up to 3.05 × 103 A/W under 300 eV...

A different x-ray phase contrast imaging technique based on the combination of structured illumination and an optimized hybrid input-output algorithm for amplitude retrieval is presented discussed. Based a modified flexible experimental setup, compared to standard propagation-based setups, method we propose here represents real advance in phase-contrast relating determination distribution. Moreover, coherent diffractive applications, proposed may yield high spatial resolution with currently...

Bionano robots have been recognized as a tumor-selective and effective platform for therapeutic outcomes they synergize the merits of living organisms nanoparticles. Here, we construct self-mineralized system (denoted SO@FeS) by employing facultative anaerobic bacterium Shewanella oneidensis MR-1 to biosynthesize FeS NPs cancer therapy with dual cell death pathways. Biogenic are embedded into surface inherent photothermal conversion ability low crystallinity tend simultaneously release Fe2+...

The electronic structure of empty states in quartz has been investigated by calculating the individual contributions Si 1s, 2p and O 1s to x-ray absorption near-edge (XANES) spectra; excellent agreement found between experimental data full multiple-scattering calculations. On basis comparison, origins spectral transition features can be assigned unambiguously. Although symmetry-based molecular-orbital theory is qualitatively adequate for describing these spectra, interpretation K-edge XANES...

X-ray Talbot-Lau interferometer, offering multi-contrast for the imaged objects, has shown powerful capacity in imaging biological soft tissues, low density materials, etc. However, length of system is constant, which limits its applications. Here, we establish a new interferometer theory to achieve flexible phase contrast system. This tunable length-scale scattering sensitivity. The experiments show that can regulate signal individually. Furthermore, construct G2-less based on this validate...

Metal ions are indispensable to life, as they can serve essential enzyme cofactors drive fundamental biochemical reactions, yet paradoxically, excess is highly toxic. Higher-order cells have evolved functionally distinct organelles that separate and coordinate sophisticated processes maintain cellular homeostasis upon metal ion stimuli. Here, we uncover the remodeling of subcellular architecture organellar interactome in yeast initiated by several stimulations, relying on near-native...

Grating-based x-ray phase-contrast imaging has been demonstrated to provide more information and higher-contrast images for low-Z soft tissues, compared with conventional absorption-based imaging. However, the existing Talbot–Lau devices are operated in either a two- or three-dimensional mode at low energy small field of view long exposure time. This is because coherence limitations, difficulties fabricating high aspect ratio gratings, slow readout speed detector. For preclinical even...

Abstract Weak absorption contrast in biological tissues has hindered x‐ray computed tomography from accessing structures. Recently, grating‐based imaging emerged as a promising solution to low‐contrast imaging, providing complementary and previously unavailable structural information of the specimen. Although it been successfully applied work with conventional sources, is time‐consuming requires sophisticated experimental setup. In this work, we demonstrate that deep convolutional neural...

Purpose: Sample radiation damage is one of the main drawbacks limiting applications x‐ray phase‐contrast imaging method. Recently, for grating‐based phase contrast imaging, reverse projection (RP) method has been proposed by Zhu et al. [Proc. Natl. Acad. Sci. U.S.A. 107, – (2010) 10.1073/pnas.1003198107 ]. Compared to conventional stepping technique, RP allows a strong reduction exposure time and minimization errors induced mechanical vibrations. However, so far, it only considered parallel...

Purpose: Grating‐based x‐ray phase contrast imaging is considered as one of the most promising techniques for future medical imaging. Many different methods have been developed to retrieve signal, among which stepping (PS) method widely used. However, further practical implementations are hindered, due its complex scanning mode and high radiation dose. In contrast, reverse projection (RP) a novel fast low dose extraction approach. this contribution, authors present quantitative analysis...

We present a theoretical analysis of x-ray-absorption near-edge structure at one Sr K edge in ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_{4}$ and ${\mathrm{SrF}}_{2}$ compounds based on the experimental results Z. Tan et al. [Phys. Rev. Lett. 64, 2715 (1990)]. Contrary to suggestion put forward this investigation which is observation certain absorption structure, we obtain best agreement with data when environment dopant atom kept fixed...

A full-field hard-x-ray microscope at SSRL has successfully imaged samples of biological and environmental origin 40 nm resolution. Phase contrast imaging trabeculae from a female mouse tibia, loaded in vivo to study the effects weight-bearing on bone structure, revealed complex network osteocytes canaliculi. Imaging cordgrass roots exposed mercury nanoparticles with strong absorption contrast. 3D tomography yeast cells grown selenium rich media showed internal structure.

In this Letter, we present a single-shot approach to quantitatively retrieve x-ray absorption and phase shift in grating interferometry. The proposed makes use of the energy-resolving capability photon-counting detectors. retrieval method is derived presented tested based on numerical simulations, including photon shot noise. good agreement between results theoretical values confirms feasibility approach.

ZnO/TiO2 core−shell nanostructures were prepared by a hydrothermal method and magnetron sputter technique. The annealing effect on the microstructure of samples phase transformation covered TiO2 shell layer investigated systematically. It was observed that special TiO2-II structure formed relatively low temperature annealing, which attributed to very small size particles as well crystal lattice match at interface. growth behavior nanostructure also discussed based experimental results.

X-ray computed tomography at the nanometer scale (nano-CT) offers a wide range of applications in scientific and industrial areas. Here we describe reliable, user-friendly, fast software package based on LabVIEW that may allow us to perform all procedures after acquisition raw projection images order obtain inner structure investigated sample. A suitable image alignment process address misalignment problems among series due mechanical manufacturing errors, thermal expansion, other external...

Synchrotron-based soft X-ray tomography (SXT), providing three-dimensional morphology and quantitative distribution of linear absorption coefficient (LAC) the imaged objects, is widely used in many fields to obtain ultra-structure images, especially cellular imaging. Off-line fluorescence microscopies (FMs) are combined identify type organelles status cells. However, deformation displacement usually occur during transfer loading process, which decreases precision two-modal images'...