ZnO nanopinecone arrays with enhanced photocatalytic performance in sunlight
ZnO nanopinecone arrays exhibit much better photocatalytic properties for the photodegradation of phenol in sunlight.
Materials Literature
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Investigation of the high-temperature redox chemistry of Sr 2 Fe 1.5 Mo 0.5 O 6−δ via in situ neutron diffraction
The composition of Sr <sub>2</sub> Fe <sub>1.5</sub> Mo <sub>0.5</sub> O <sub>6−δ</sub> , a SOFC electrode material, is investigated by neutron diffraction in both highly oxidizing and reducing conditions, and correlated with measured physical properties.
Doubts on Kissinger´s method of kinetic evaluation based on several conceptual models showing the difference between the maximum of reaction rate and the extreme of a DTA peak
The famous Kissinger's kinetic evaluation method (Anal. Chem. 1957) is examined with respect to the feasible impact of the individual quantities and assumptions involved, namely the model of reaction mechanism, f(a) (with the iso- and nonisothermal degrees of conversion, ? and ?) the rate constant, k(T) (and associate…
Tip-enhanced Raman spectroscopic measurement of stress change in the local domain of epitaxial graphene on the carbon face of 4H-SiC(000–1)
We develop a bulk silver tip for tip-enhanced Raman scattering (TERS) and obtain TERS spectra of epitaxial graphene on the carbon face of 4H-SiC(000-1) with a high signal-to-noise ratio. Thanks to the high quality of TERS spectra we firstly find that the G band in the TERS spectra exhibits position-by-position variati…
Plasma chemical and chemical functionalization of polystyrene colloidal crystals
Self-assembling systems of colloidal spheres are widely used as templates for the structured deposition of metals and semiconductors. Multilayer samples of ordered polystyrene spheres are prepared by a flow induced process. The subsequent surface activation by a dielectric barrier discharge in oxygen is followed by th…
Facile synthesis of porous MgO–CaO–SnOx nanocubes implanted firmly on in situ formed carbon paper and their lithium storage properties
Porous MgO–CaO–SnOx nanocubes (crystalline SnOx and amorphous MgO/CaO) were synthesized to implant firmly and uniformly onto in situ formed carbon paper by a facile route including a template-free growth process and calcining treatment. Low-cost filter paper was used to realize the part implantation of cubes as well a…
Engineered elastomeric bio-nanocomposites from linseed oil/organoclay tailored for vibration damping
This study deals with the preparation and characterization of elastomeric nanocomposites from renewable resources for vibration damping applications.
Relative stability of benziporphyrin and naphthiporphyrin tautomers and the emergence of macrocyclic diatropicity
The conformations of a series of benziporphyrins, naphthiporphyrins, oxybenziporphyrins, and related structures were minimized using DFT-B3LYP/6-311++G(d,p). The relative stabilities of the tautomers for each series were calculated using M06-2X and B3LYP-D functionals, and bond lengths were obtained. The diatropic pro…
Preparation of layered double hydroxide/chlorophyll a hybrid nano-antennae: a key step
In the first step to obtain an efficient nano-antenna in a bottom-up approach, new hybrid materials were synthesized using a set of layered double hydroxides (LDHs) with basic properties and pure chlorophyll a (Chl a). The stability of the adsorbed monolayer of Chl a was shown to be dependent on the nature and the rat…
Determination of Fe oxidation states in the B-site ordered perovskite-type Ba2Ca0.67Fe0.33NbO6−δ at the surface (nano-scale) and bulk by variable temperature XPS and TGA and their impact on electrochemical catalysis
In this study, we analyzed the surface and bulk valences of Fe in the double perovskite-type Ba2Ca0.67Fe0.33NbO6−δ by both variable temperature X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). The concentration of Fe2+ near-surface was found to be about 3 times higher than that in the bulk…
Kroll-carbons based on silica and alumina templates as high-rate electrode materials in electrochemical double-layer capacitors
Hierarchical Kroll-carbons (KCs) with combined micro- and mesopore systems are prepared from silica and alumina templates by a reductive carbochlorination reaction of fumed silica and alumina nanoparticles inside a dense carbon matrix. The resulting KCs offer specific surface areas close to 2000 m2 g−1 and total pore…
Piezoelectricity of lead-free (K, Na)NbO 3 nanoscale single crystals
PFM characterization of (K, Na)NbO <sub>3</sub> nanoscale single crystals reveals the piezoelectric composition dependence and the existence of a phase boundary.
Probing the charging mechanisms of carbon nanomaterial polyelectrolytes
Chemical charging of single-walled carbon nanotubes (SWCNTs) and graphenes to generate soluble salts shows great promise as a processing route for electronic applications, but raises fundamental questions. The reduction potentials of highly-charged nanocarbon polyelectrolyte ions were investigated by considering their…
Machining of Tungsten Heavy Alloy under Cryogenic Environment
The machining of tungsten heavy alloy is very difficult as it has high strength and hardness, which requires special cutting tools and cutting process. Though carbide tools are extensively used in conventional cutting, these lead take high machining time and tool failures which cause to decrease in productivity. To ov…
Anomalous phase separation behavior in dynamically asymmetric LCST polymer blends
The interplay of thermodynamic forces and self-generated stresses induced in different compositions, and at different quench depths on the phase behavior of dynamically asymmetric PS/PVME blends are studied. The thermodynamic phase diagram is obtained from dynamic temperature sweep experiments. Phase contrast optical…
The Effect of Copper Addition on the Mechanical and Wear Properties of Grey Cast Iron
An alloy of cast iron and copper (Fe-Cu) has been developed using a stir cast process. The compositional, microstructural characterization and wear property of the developed Fe-Cu alloy were carried out with the aids of X-ray diffractometer, scanning electron microscope (SEM) and pin on Disc machine. The mechanical pr…
Hydrogen Effect on Fatigue Behavior of a Quenched&tempered Steel
The investigated material is a quenched&tempered steel for hydrogen applications. Understanding of hydrogen embrittlement and its effect on the mechanical characteristics of steel becomes fundamental. It is, in fact, well known that the atomic hydrogen can cause embrittlement and degradation of the mechanical characte…
Fluorescence enhancement detection of uric acid based on water-soluble 3-mercaptopropionic acid-capped core/shell ZnS:Cu/ZnS
A simple core/shell ZnS:Cu/ZnS QD based fluorescence enhancement system is constructed for detecting uric acid. The method with high sensitivity, selectivity and lower toxicity features was applied for determination of UA in real samples.
An Optimization-based Atomistic-to-Continuum Coupling Method
We present a new optimization-based method for atomistic-to-continuum (AtC) coupling. The main idea is to cast the latter as a constrained optimization problem with virtual Dirichlet controls on the interfaces between the atomistic and continuum subdomains. The optimization objective is to minimize the error between t…
Visible and near-infrared luminescent mesoporous titania microspheres functionalized with lanthanide complexes: microstructure and luminescence with visible excitation
A new type of monodisperse mesoporous titania microspheres possessing visible (Eu3+, Sm3+) and near-infrared (Sm3+, Yb3+, Nd3+) luminescence were synthesized with covalent linking to Ln(dbm)3bpdc complexes (Ln = Eu, Sm, Yb, Nd, dbm = dibenzoylmethanate, bpdc = 2,2′-bipyridine-4,4′-dicarboxylic acid). These lanthanide…