The preparation and study of quantum dots wires play a very important role in nanotechnology. In this particular study, we report on the uptake silver by living alfalfa plants. X-ray absorption spectroscopy transmission electron microscopy (TEM) studies corroborated metal plants from silver-rich solid medium subsequent formation nanoparticles. Silver nanoparticle alignment, structure, coalescence were observed using TEM with an atomic resolution analysis. Dark field image showed connection...

The diffusion and coalescence of metal nanoparticles play important roles in many phenomena. Here, we offer a new integrated overview the main factors that control nanoparticle process. Three are considered our description process: across surface, their physical thermodynamic properties, mechanism coalescence. We demonstrate liquid-like properties surface layers an essential role this present experimental evidence for opinion, based on high-resolution electron microscopic analysis several...

Ultrathin transition metal dichalcogenides (TMDCs) of Mo and W show great potential for digital electronics optoelectronic applications. Whereas early studies were limited to mechanically exfoliated flakes, the large-area synthesis 2D TMDCs has now been realized by chemical vapor deposition (CVD) based on a sulfurization reaction. Since then, properties CVD grown monolayer MoS$_{2}$ have heavily investigated, but influence stoichiometry electrical optical largely overlooked. Here we...

This paper describes the internal structure of Au−Pd nanoparticles exhibiting newly discovered three-layer core/shell morphology, which is composed an evenly alloyed inner core, Au-rich intermediate layer, and a Pd-rich outer shell. By exploitation spatially resolved imaging spectroscopic diffraction modes transmission electron microscopy (TEM), insights were gained on composition each one observed three layers, indicating significant extent intimate alloy among monometallic elements.

Candida albicans is the most common pathogenic fungus isolated in bloodstream infections hospitalized patients, and candidiasis represents fourth infection United States hospitals, mostly due to increasing numbers of immune- medically-compromised patients. C. has ability form biofilms morphogenetic conversions between yeast hyphal morphologies contribute biofilm development represent an essential virulence factor. Moreover, these attached communities cells are surrounded by a protective...

A series of In2O3 thin films, ranging from X-ray diffraction amorphous to highly crystalline, were grown on silica substrates using pulsed laser deposition by varying the film growth temperature. The amorphous-to-crystalline transition and structure investigated grazing angle (GIXRD), Hall transport measurement, high resolution transmission electron microscopy (HRTEM), diffraction, extended absorption fine (EXAFS), ab initio molecular dynamics (MD) liquid-quench simulation. On basis...

The alloy Au–Ag system is an important noble bimetallic phase, both historically (as “Electrum”) and now especially in nanotechnology, as it applied catalysis nanomedicine. To comprehend the structural characteristics thermodynamic stability of this alloy, a knowledge its phase diagram required that considers explicitly size shape (morphology) dependence. However, experimental determination remains quite challenging at nanoscale, theoretical guidance can provide significant advantages. Using...

Two challenges for effectively exploiting the remarkable properties of single-walled carbon nanotubes (SWNTs) are isolation intact individual from raw material and assembly these isolated SWNTs into useful structures. In this study, we present atomic force microscopy (AFM) evidence that can isolate peptide-wrapped SWNTs, possibly connected end-to-end long fibrillar structures, using an amphiphilic α-helical peptide, termed nano-1. Transmission electron (TEM) well-resolved absorption spectral...

In this work, we synthesized ZnO nanorods by a wet chemical process. By varying different parameters of the synthesis process like precursor concentration, solvent used, surfactant, temperature, and reaction time, were able to control aspect ratio (l/d) sharpness factor (Sf = h/b) rods. Rods with an ∼20 10 repeatedly obtained characterized from scanning electron microscopy. High-resolution transmission microscopy dark field analysis revealed that grow as single crystal along c axis [0001]....

This study addresses how ligands module the structure and electronic optical properties of a large set experimentally known anionic thiolate-protected gold clusters, Au25(SR)18[1−]. Starting from experimental crystal structure, computational density functional theory calculations reveal that low-polarity R groups do not disturb Au25S18 framework significantly, such inversion symmetry(Ci) crystalline state is retained. In case p-thiolphenolate ligands, p-SPhX, major distortion framework,...

Abstract In recent years, an increasing number of laboratories have been applying in situ heating (and ultimately, gas reaction) techniques electron microscopy studies catalysts and other nanophase materials. With the advent aberration‐corrected microscopes that provide sub‐Ångström image resolution, it is great interest to study behavior materials at elevated temperatures while maintaining resolution capabilities microscope. collaboration with Protochips Inc., our laboratory developing...

Gold–copper (Au–Cu) phases were employed already by pre-Columbian civilizations, essentially in decorative arts, whereas nowadays, they emerge nanotechnology as an important catalyst. The knowledge of the phase diagram is critical to understanding performance a material. However, experimental determination nanophase diagrams rare because calorimetry remains quite challenging at nanoscale; theoretical investigations, therefore, are welcomed. Using nanothermodynamics, this paper presents...

Abstract Abnormal accumulation of brain metals is a key feature Alzheimer’s disease (AD). Formation amyloid-β plaque cores (APC) related to interactions with biometals, especially Fe, Cu and Zn, but their particular structural associations roles remain unclear. Using an integrative set advanced transmission electron microscopy (TEM) techniques, including spherical aberration-corrected scanning (Cs-STEM), nano-beam diffraction, holography analytical spectroscopy techniques (EDX EELS), we...

Determination of the total structure molecular nanocrystals is an outstanding experimental challenge that has been met, in only a few cases, by single-crystal X-ray diffraction. Described here alternative approach most general applicability and does not require fabrication single crystal. The method based on rapid, time-resolved nanobeam electron diffraction (NBD) combined with high-angle annular dark field scanning/transmission microscopy (HAADF-STEM) images probe corrected STEM microscope,...

Au, Cu and bimetallic Au-Cu nanoparticles were synthesized on the surface of commercial TiO2 compounds (P25) by reduction metal precursors with tetrakis (hydroxymethyl) phosphonium chloride (THPC) (0.5 % in weight). The alloyed structure NPs was confirmed HAADF-STEM, EDS, HRTEM XPS techniques. photocatalytic properties modified have been studied for phenol photodegradation aqueous suspensions under UV-visible irradiation. modification induces an increase activity. highest activity is...

Bimetallic nanoparticles like Cu–Ni are particularly attractive due to their magnetic and catalytic properties; however, properties depend strongly on the structure of alloy <italic>i.e.</italic> mixed, core–shell or Janus.

Starting from an amorphous C film, single-walled carbon nanotubes were obtained in situ a high-resolution electron microscope by the combined effect of irradiation and axial strain. Ductile developed either junction or linear chain atoms before failure. These facts have been put direct evidence for first time. Tight-binding calculations indicate that bonding is cumulene type.

We report the synthesis of gold nanoparticles directly conjugated to bovine serum albumin protein by chemical reduction in aqueous solution. Transmission electron microscopy reveals that are well dispersed with an average diameter less than 2 nm, and elemental analysis verifies composition gold−protein conjugates. Infrared spectroscopy confirms polypeptide backbone is not cleaved during conjugation process side chain functional groups remain intact. Raman demonstrates disulfide bonds broken...

The morphology of crystalline precipitates in a solid-state matrix is governed by complex but tractable energetic considerations driven largely volume strain energy minimization and anisotropy interfacial energies. Spherical precipitate morphologies are favored isotropic systems, while anisotropic energies give preference to certain crystallographically oriented interfaces, resulting faceted morphology. In conventional solid-solution precipitation, precipitate's morphological evolution...

The structure of the Au15-thiolate cluster has been elucidated using a DFT approach, and it is demonstrated to comprise Au4-tetrahedron core protected solely by combination two concatenated staple motifs. longer motif efficiently wraps core, threads shorter one. structural assignment supported comparison powder X-ray diffraction pattern and, via time dependent-DFT calculations, optical chiroptical (CD) absorption spectra. calculated CD spectrum features characteristic strong peak centered at...

Using graphene as an ultrathin support, high-resolution transmission and scanning electron microscopy (TEM STEM) images of organic ligand-stabilized silicon (Si) nanocrystals with unprecedented clarity were obtained. TEM Si are usually obscured on conventional amorphous carbon supports because low atomic number (Z) contrast. The atomically thin enabled clear the crystalline cores and, for first time, capping ligands. Various twin defects observed, often accompanied by very significant...