Materials Literature
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The systematic and controlled reduction of vanadium oxide nanoscrolls results in routes to the large-scale preparation of nanostructures of the interesting and useful materials rutile VO 2 and corundum V 2 O 3 . Vanadium oxide (V 2 O 5−δ ) nanoscrolls, prepared by the hydrothermal treatment of aged suspensions of V 2…
Surface oxidation of Cu(100) has been investigated by variable temperature scanning tunneling microscopy and quantitative x-ray photoelectron spectroscopy as a function of O(2) pressure (8.0x10(-7) and 3.7x10(-2) mbar) at 373 K. Three distinct phases in the initial oxidation of Cu(100) have been observed: (1) the form…
Abstract 3‐Arm star‐block copolymers, (polystyrene‐ b ‐poly(methyl methacrylate)) 3 , (PS‐ b ‐PMMA) 3 , and (polystyrene‐ b ‐poly(ethylene glycol)) 3 , (PS‐ b ‐PEG) 3 , are prepared using double‐click reactions: Huisgen and Diels–Alder, with a one‐pot technique. PS and PMMA blocks with α‐anthracene‐ω‐azide‐ and α‐male…
U-shaped host for OUr guest: Two uranyl–peroxo squares [(UO2)(O2)]4 were incorporated into the hitherto unknown U-shaped “P6W36” Wells–Dawson ion. The 36-tungsto-8-phosphate [Li(H2O)K4(H2O)3{(UO2)4(O2)4-(H2O)2}2(PO3OH)2P6W36O136]25− (see picture) was synthesized by using the poorly investigated precursor [H6P4W24O94]1…
We present the results of ab initio hybrid density-functional calculations of the atomic and the electronic structures of ${\text{LaMnO}}_{3}$ (LMO) and ${\text{La}}_{1\ensuremath{-}{x}_{b}}{\text{Sr}}_{{x}_{b}}{\text{MnO}}_{3}$ (001) surfaces. The total energies obtained from these calculations were used to analyze t…
Nanoporous spherical assemblies of iso-oriented cobalt ferrite nanoparticles with a high surface area were prepared via a normal micelles process. The spherical magnetic assemblies were coated with a silica layer through an inverse micelles route. The microstructure and morphology were studied by X-ray diffraction, tr…
The effective atomic number, Z(eff), the effective electron density, N(el), and kerma have been calculated for some fatty acids and carbohydrates for photon interaction in the extended energy range from 1 keV to 100 GeV using an accurate database of photon-interaction cross sections and the WinXCom program. The signif…
We have studied quasi-two-dimensional multiferroic LuFe2O4 with strong charge-spin-lattice coupling, in which low-temperature coercivity approaches an extraordinary value of 9 T in single crystals. The enhancement of the coercivity is connected to the collective freezing of nanoscale pancakelike ferrimagnetic domains…
We present a thermodynamic integration method for free energy evaluation in field-theoretic simulations of classical fluids and polymers. The approach employs an Einstein crystal reference state, analogous to a method developed for particle simulations of crystals by Frenkel and Ladd, but applies equally well in the p…
Carbon-nanotube (CNT) field-effect transistors (CNFETs) are promising extensions to silicon CMOS. Simulations show that CNFET inverters fabricated with a perfect CNFET technology have 13 times better energy delay product compared with 32-nm silicon CMOS inverters. The following two fundamental challenges prevent the f…
Employing guided-ion-beam mass spectrometry, we identified a series of positively charged stoichiometric zirconium oxide clusters that exhibit enhanced activity and selectivity for three oxidation reactions of widespread chemical importance. Density functional theory calculations reveal that these clusters all contain…
Innocent or guilty? Catecholato–platinum(II) complexes with phenol-substituted α-diimine ligands are oxidised to the corresponding paramagnetic radical cationic complexes, as well as deprotonated to the corresponding base (see scheme). The radical cations are ortho-benzosemiquinoid in character (EPR spectroscopy). The…
Fabrication of polymer composites reinforced with lignocellulosic materials has increased considerably during the last few years. This work reports the synthesis of natural fiber reinforced phenol-formaldehyde (PF) resin matrix based polymer composite using a compression molding technique. Initially the PF resin was p…
In the present study, silver metal nanofibers have been successfully prepared by using the electrospinning technique. Silver nanofibers have been produced by electrospinning a sol-gel consisting of poly(vinyl alcohol) and silver nitrate. The dried nanofiber mats have been calcined at 850 degrees C in an argon atmosphe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUnique Thermal Conductivity Behavior of Single-Walled Carbon Nanotube−Polystyrene CompositesJonathan E. Peters, Dimitrios V. Papavassiliou, and Brian P. Grady*View Author Information School of Chemical, Biological, and Materials Eng…
We report for the first time synthesis of high-aspect-ratio tantalum oxide nanotube arrays via one-step anodization of Ta foil. The use of aqueous electrolytes containing HF:H 2 SO 4 in the volumetric ratios 1:9 and 2:8 results in formation of ordered nanodimpled surfaces with 40−55 nm pore diameters over the potentia…
In this letter, we present the on-demand coupling of single NV(-) defect centers in nanodiamonds to a polystyrene microspherical resonator. From an ensemble on a coverslip, we select single nanodiamonds containing a single defect proven by a pronounced antibunching dip. With the help of a scanning near-field probe, we…
In this letter, the properties of split-ring resonators (SRRs) loaded with high-Q capacitors and nonlinear varactors are theoretically analyzed and experimentally measured. We demonstrate that the resonance frequency f(m) of the nonlinear SRRs can be tuned by increasing the incident power. f(m) moves to lower and high…
Chemical exchange saturation transfer (CEST) MRI provides a sensitive detection mechanism that allows characterization of dilute labile protons usually undetectable by conventional MRI. Particularly, amide proton transfer (APT) imaging, a variant of CEST MRI, has been shown capable of detecting ischemic acidosis, and…
We have synthesized a new quaternary borocarbide PrPd$_{2}$B$_{2}$C and measured its magnetization, electrical resistivity and specific heat. The compound crystallizes in the LuNi$_{2}$B$_{2}$C-type tetragonal structure (space group {\it I4/mmm}). Above 100 K the magnetic susceptibility follows Curie-Weiss behavior wi…