Materials Literature
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The profile distributions of aluminum extracted by the Tamm and Bascomb reagents and of the exchangeable aluminum were studied in soils of automorphic, transitive, and accumulative positions in the landscapes of the southern taiga. In the mineral horizons of the gleyic peaty-podzolic soils developed on poorly drained…
Multi-wall carbon nanotube (MWCNT)/polymer composites are hybrid materials that combine numerous mechanical, electrical and chemical properties and thus, constitute ideal biomaterials for a wide range of regenerative medicine applications. Although, complete dispersion of MWCNT in a polymer matrix has rarely been achi…
With the aim of developing a single-crystal graphene substrate, which is indispensable for practical applications of graphene, we are experimentally and theoretically investigating the structural and physical properties of graphene grown on silicon carbide by thermal decomposition.
The surface chemical composition and pyroelectric properties in polypropylene (PP) film poled by corona discharge in the air were estimated by Fourier transform infrared spectrophotometry (FTIR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermally stimulated depolarization current (…
The electrical conductivity and thermal expansion coefficient of GdBaCo2O5.5 samples have been measured in order to reveal the mechanism of the metal-insulator transition in cation-ordered cobaltites RBaCo2O5.5 (where R is a rare-earth element) and its relation to the change in the spin state of cobalt ions. It has be…
Abstract High‐pressure torsion (HPT) was conducted on Cu alloys containing ferromagnetic Co and Fe particles. Electron probe microanalysis, X‐ray diffraction analysis, and transmission electron microscopy confirmed that the particles were significantly refined through fragmentation and some fractions were dissolved in…
10% KF-doped barium titanate powders, Ba 0.9 K 0.1 TiO 2.9 F 0.1 , were synthesized through a sol–gel process. The powders, calcined at 650 °C, consist of cubic crystalline particles of ∼70 nm in length; the particle size increases to ∼200 nm as the firing temperature increases to ca. 800 °C, above which F 2 begins to…
The mechanical properties of polymer encapsulating materials change considerably when packages are exposed to elevated temperatures for longer times. Here we report a systematic study on the change in viscoelastic properties of a commercial molding compound which is stored at 175°C for periods of time ranging up to 4…
Photocatalysis was combined with O3 (O3-PCO) for better destruction performance of formaldehyde and toluene. It is of significance to study the stability of O3-PCO process since it is essential to the application of O3-PCO technology. The present work investigated the mechanism of enhanced performance and improved sta…
Abstract Zukunft der Diamontoide. Obwohl die Klasse der Diamantoide schon seit Jahrzehnten bekannt ist, hat die Renaissance dieser molekularen Nanodiamanten erst vor kurzem begonnen. Im letzten Jahrhundert gab es bereits eine Vielzahl an Forschungsarbeiten auf dem Gebiet des kleinsten Diamantoiden, dem Adamantan. Viel…
Abstract Nanostructured polymers and ultra‐thin polymer layers are used more and more in technical applications like nanotechnology and microelectronics. Therefore, it is really important to understand the size‐scale dependent properties as bulk polymers become thinner and more two‐dimensional. Here the morphology as…
Abstract Ag/polypyrrole (PPy) core‐shell nanospheres were fabricated through the redox reaction between pyrrole monomer and silver nitrate in the presence of polyvinylpyrrolidone (PVP) and by using the Ag colloidal nanoparticles acting as the seedings. The prepared nanospheres with a shell thickness of 10–12 nm and a…
Plastids of Climaconeis (Okedenia) were originally characterized by Mereschkowsky as H-shaped in girdle view with pyrenoids but recent descriptions implicitly or explicitly indicate that the H-shape is seen in valve view. We observed five known taxa–one a variety that we raise to species rank–and two new species: C. s…
Millimeter-scale, vertically aligned carbon nanotubes (CNTs) were grown at a relatively low temperature of 700 °C by the microwave plasma chemical vapor deposition. Oxygen and water were used to investigate their role in the growth rate and crystallinity of CNTs. Scanning electron microscopy and transmission electron…
The role of oxygen atoms in the growth of magnetron sputter-deposited ZnO films was studied by alternating the deposition of a several-nanometer-thick ZnO layer and the O2/Ar mixture plasma exposure, i.e., layer-by-layer technique. The film crystallization promoted with suppressing the oxygen vacancy and interstitial…
Copper oxide thin films were deposited by the chemical bath deposition technique. CuSO 4 and Na 2 SO 3 were used to prepare the deposition solution, and the solution was heated to 70–80 °C. The deposited films are crystalline with a cubic crystal structure and have Cu/O ratios of 1.7–1.8. The oxygen content can be inc…
Ionic, proton, and oxygen conductivities are measured as functions of air humidity (pH2O = 0.04−3.57 kPa) in the BaZr1 − x Y x O3 − α system (x = 0.02−0.15) over the temperature range 600–900°C. The important result is obtained that dissolved water vapor determines not only proton transport, but also the overwhelming…
The transport properties of hexagonal boron–nitride nanoribbons under the uniaxial strain are investigated by the Green's function method. We find that the transport properties of armchair boron–nitride nanoribbon strongly depend on the strain. In particular, the features of the conductance steps such as position and…
Apesar das modernas e sofisticadas técnicas disponíveis, procedimentos de extração seletiva ainda são de considerável valor para a caracterização dos solos e para o entendimento dos processos pedogenéticos, sobretudo em ambientes e solos pouco estudados, como as restingas e os Espodossolos no Brasil. A aplicação dessa…
The first series of alkali dipyrrinato complexes is reported, encompassing lithium, sodium, and potassium salts of meso-unsubstituted and meso-aryl-substituted derivatives. By varying the substituents at the meso position, the intermolecular distance between the two nitrogen atoms and thus the κ 2 -N,N-bidentate bite…