A5013217472- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Crystal Structures and Properties
- Geological and Geochemical Analysis
- Crystallography and molecular interactions
- High-pressure geophysics and materials
- Zeolite Catalysis and Synthesis
- Clay minerals and soil interactions
- Quantum Dots Synthesis And Properties
- Electron and X-Ray Spectroscopy Techniques
- Chemical Synthesis and Characterization
- Advanced Electron Microscopy Techniques and Applications
- Chalcogenide Semiconductor Thin Films
- Crystallography and Radiation Phenomena
- Enzyme Structure and Function
- Perovskite Materials and Applications
- Diatoms and Algae Research
- Mesoporous Materials and Catalysis
- earthquake and tectonic studies
- Nuclear Physics and Applications
- Iron oxide chemistry and applications
- Geochemistry and Geologic Mapping
- 2D Materials and Applications
- Methane Hydrates and Related Phenomena
- Astro and Planetary Science
Center for Nanotechnology Innovation
2016-2024
University of Pisa
2019-2024
Italian Institute of Technology
2016-2022
Piaggio (Italy)
2022
Piaggio Aerospace (Italy)
2022
University of Antwerp
2020
National Enterprise for NanoScience and NanoTechnology
2020
University of Siena
2004-2018
Earth Science Institute of the Slovak Academy of Sciences
2018
Johannes Gutenberg University Mainz
2008-2016
The formation of mesopores in microporous zeolites is generally performed by postsynthesis acid, basic, and steam treatments. hierarchical pore systems thus formed allow better adsorption, diffusion, reactivity these materials. By combining organic inorganic structure-directing agents high-throughput methodologies, we were able to synthesize a zeolite with system micropores mesopores, channel openings delimited 28 tetrahedral atoms. Its complex crystalline structure was solved the use...
A highly porous member of isoreticular MFU-4-type frameworks, [Zn(5)Cl(4)(BTDD)(3)] (MFU-4l(arge)) (H(2)-BTDD=bis(1H-1,2,3-triazolo[4,5-b],[4',5'-i])dibenzo[1,4]dioxin), has been synthesized using ZnCl(2) and H(2)-BTDD in N,N-dimethylformamide as a solvent. MFU-4l represents the first example frameworks featuring large pore apertures 9.1 Å. Here, serves reference compound to evaluate origin unique specific gas-sorption properties MFU-4, reported previously. The latter framework features...
Abstract Automated electron Diffraction Tomography (ADT) comprises an upcoming method for “ab intio” structure analysis of nano crystals. ADT allows fine sampling the reciprocal space by sequential collection diffraction patterns while tilting a crystal in fixed tilt steps around arbitrary axis. Electron is collected mode (NED) with semi‐parallel beam diameter down to 50 nm. For tracking micro‐probe STEM imaging used. Full automation acquisition procedure allowed optimisation dose...
Metal and metal oxide nanocrystals have sparked great interest due to their excellent catalytic, magnetic, electronic properties. Particularly, the integration of metallic one-dimensional (1D) electronically conducting carbons form metal−carbon hybrids can lead enhanced physical chemical properties or even creation new with respect single component materials. However, direct access thermally stable structurally ordered 1D remains a primary challenge. We report an in situ fabrication Co3O4 Pt...
A combined approach: permanent highly porous bismuth-containing metal–organic framework (CAU-7) has been synthesized and its structure determined by a combination of electron diffraction, Rietveld refinement, DFT calculations. The compound is catalytically active in the hydroxymethylation furan (see picture). Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...
"This is a mineral about which there has been much discussion" typical statement vaterite in older standard textbooks of inorganic chemistry. This polymorph CaCO3 was first mentioned by H. Vater 1897, plays key roles weathering and biomineralization processes, but occurs only the form nanosized crystals, unsuitable for structure determination. Its could now be solved automated electron diffraction tomography from 50 nm sized nanocrystals. Detailed facts importance to specialist readers are...
Engineering materials with specific physical properties have recently focused on the effect of nanoscopic inhomogeneities at 10 nm scale. Such features are expected to scatter medium- and long-wavelength phonons thereby lowering thermal conductivity system. Low is a prerequisite for effective thermoelectric materials, challenge limit transport heat by phonons, without simultaneously decreasing charge transport. A solution-phase technique was devised synthesis "Zn(4)Sb(3)" nanocrystals as...
Abstract Charoite, ideally (K,Sr,Ba,Mn) 15–16 (Ca,Na) 32 [(Si 70 (O,OH) 180 )](OH,F) 4.0 · n H 2 O, a rare mineral from the Murun massif in Yakutiya, Russia, was studied using high-resolution transmission electron microscopy, selected-area diffraction, X-ray spectroscopy, precession diffraction and newly developed technique of automated electron-diffraction tomography. The structure charoite ( = 31.96(6) Å, b 19.64(4) c 7.09(1) β 90.0(1)°, V 4450(24) Å 3 , space group P 1 / m ) solved ab...
Abstract In the last decade importance of transmission electron microscopic studies has become increasingly important with respect to characterization organic materials, ranging from small molecules polymers and biological macromolecules. This review will focus on use microscope perform crystallography experiments, detailing approaches in acquiring crystallographic data. The traditional selected area approach recently developed method automated diffraction tomography (ADT) be discussed...
In this work a new ultrafast data collection strategy for electron diffraction tomography is presented that allows reducing acquisition time by one order of magnitude. This methodology minimizes the radiation damage beam-sensitive materials, such as microporous materials. method, combined with precession beam, provides high quality enabling determination very complex structures. Most importantly, implementation easily affordable in any modern microscope. As proof concept, we have solved...
Recent advances in 3D electron diffraction have allowed the structure determination of several model proteins from submicrometric crystals, unit-cell parameters and structures which could be immediately validated by known models previously obtained X-ray crystallography. Here, first new protein determined data is presented: a unobserved polymorph hen egg-white lysozyme. This form, with = 31.9, b 54.4, c 71.8 Å, β 98.8°, grows as needle-shaped crystals simply vapor diffusion starting reported...
Layered double hydroxides (LDHs) are versatile materials used for intercalating bioactive molecules in the fields of pharmaceuticals, nutraceuticals and cosmetics, with purpose protecting them from degradation, enhancing their water solubility to increase bioavailability improving pharmacokinetic properties formulation stability. Moreover, LDHs various technological applications improve stability processability. The crystal chemistry hydrotalcite-like compounds was investigated by X-ray...
The crystal structures of two important marketed pharmaceuticals, namely, ramelteon (RAM) and tolvaptan (TOL), were determined for the first time using 3D precession electron diffraction tomography (PEDT) on 500 nm-sized crystals. results compared with same by single-crystal X-ray subsequently grown 50–200 μm single crystals, indicating a good match molecular conformation, packing, unit cell parameters. used to validate developed workflow data acquisition structure solution diffraction. This...
Orthocetamol is a regioisomer of the well-known pain medication paracetamol and promising analgesic an anti-arthritic medicament itself. However, orthocetamol cannot be grown as single crystals suitable for X-ray diffraction, so its crystal structure has remained mystery more than century. Here, we report ab-initio determination obtained by 3D electron combining low-dose acquisition method dedicated single-electron detector recording diffracted intensities. The monoclinic, with...
We report the colloidal synthesis of a series surfactant-stabilized lead chalcohalide nanocrystals. Our work is mainly focused on Pb4S3Br2, phase unknown to date that does not belong ambient-pressure PbS–PbBr2 diagram. The Pb4S3Br2 nanocrystals herein feature remarkably narrow size distribution (with dispersion as low 5%), good tunability (from 7 ∼30 nm), an indirect bandgap, photoconductivity (responsivity = 4 ± 1 mA/W), and stability for months in air. A crystal structure proposed this new...
Colloidal chemistry grants access to a wealth of materials through simple and mild reactions. However, even few elements can combine in variety stoichiometries structures, potentially resulting impurities or wrong products. Similar issues have been long addressed organic by using reaction-directing groups, that are added substrate promote specific product later removed. Inspired such approach, we demonstrate the use CsPbCl3 perovskite nanocrystals drive phase-selective synthesis two yet...
Cisplatin chemoradiotherapy (CRT) is the established standard of care for managing locally advanced human papillomavirus-positive head/neck carcinoma. The typically young patients may suffer serious and long-time side effects caused by treatment, such as dysphagia, hearing loss. Thus, ensuring a satisfactory post-treatment quality life paramount. One potential replacing approach to classical CRT involves combination standard-dose radiotherapy radiosensitizers noble metal nanoparticles (NPs)....
Iron-modified zeolites present a promising method for treating hexavalent chromium (Cr(VI)) contamination in water due to their adsorption and reduction properties. Fe(II)-modified reduce Cr(VI) Cr(III), less toxic soluble form, while Fe(III)-modified adsorb directly onto surface. However, comprehensive comparative analysis of efficacy is limited current research.This study evaluates the effectiveness Fe(II)- using synthetic Cr solutions real contaminated surface water. Natural zeolite (ZN),...