Materials Literature
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A new and known barium cerates doped by In and Ga were synthesized in air at 1700 K. The synthesis was performed by solid state reactions from BaCO3, CeO2, In2O3 or Ga2O3. X-ray diffraction profiles of the powdered samples were obtained with DRON-UM-1 and STADI-P diffractometers using monochromatized CuKa radiation. T…
The optical absorptions of different Au32 isomers in the whole frequency range from the far-infrared (FIR) to near-ultraviolet (UV) have been calculated using the relativistic density-functional method in order to identify their geometrical structures. It is found that there exists a distinctive difference between the…
The periodic deviations of ferromagnetic and antiferromagnetic spins from corresponding uniform configurations are shown to be energetically favorable close to a compensated interface of ferromagnetic antiferromagnetic bilayer. The amplitude of the deviations decreases exponentially into the film volumes as a function…
Carbon nanotubes (CNT) have a very large application potential in the rapid developing field of molecular electronics. Infinite single-wall metallic CNTs have theoretically a conductance of 4e2/h because of the two electronic bands crossing the Fermi level. For finite size CNTs experiments have shown that other values…
We consider the probability distribution for fluctuations in dynamical action and similar quantities related to dynamic heterogeneity. We argue that the so-called "glass transition" is a manifestation of low action tails in these distributions where the entropy of trajectory space is subextensive in time. These low ac…
Single-phase vanadium dioxide (VO2) thin films have been grown on Si3N4∕Si substrates by means of a well-controlled magnetron sputtering process. The deposited VO2 films were found to exhibit a semiconductor-to-metal transition (SMT) at ∼69°C with a resistivity change as high as 3.2 decades. A direct and clear-cut cor…
Abstract Titanium thin films, 400 nm to 1000 nm thick, fabricated by radio frequency (rf) sputter deposition are anodized in an electrolyte containing acetic acid and hydrofluoric acid to form optically transparent films of highly ordered titania nanotube arrays. Real‐time monitoring of the anodization current, at a f…
The approximate representation of a quantum solid as an equivalent composite semi-classical solid is considered for insulating materials. The composite is comprised of point ions moving on a potential energy surface. In the classical bulk domain this potential energy is represented by pair potentials constructed to gi…
Abstract ZnO fibers are synthesized by hydrothermal method from Zn(OH)42− starting solution. The morphologies of obtained ZnO fibers are closely related to the hydrothermal treatment temperature and Zn2+/OH− ratio, and the bunch-like growth phenomenon is revealed by scanning electron microscopy (SEM) and transmission…
The macroscopic contact angle theta(m) of a liquid drop on a rough solid surface in the presence of a gas is calculated microscopically on the basis of a variational minimization of the total potential energy of the drop. Two limiting cases are considered: the liquid penetrates into the space between asperities (Wenze…
We investigated the adhesive properties of binary heterogeneous polymer brushes made from end-functionalized polystyrene (PS) and poly(2-vinylpyridine) (P2VP) chains. The molecular organization of the mixed brush could be varied reversibly by exposure to selective solvents for PS (toluene) and for P2VP (acidic water).…
Abstract Natural α-, β-, and γ-cyclodextrins (CDs) were intercalated in the interlayer of layered double hydroxide (LDH) by calcination–rehydration reaction using the calcined precursor of Mg–Al/CO3/LDH. The intercalated amount was considerably large in spite of nonanionic macrocyclic molecule in the wide CD concentra…
Abstract First sample of VUV-excited intensely luminescent glass is successfully prepared using the leached sintered glass with impregnation of Tb3+ ions which is colorless, transparent and gives intense emission 5D4 → 7F5 at 543 nm under the 160 nm VUV excitation.
A new preparation method for porous silica particles was developed using activated silica sols which are called nano-silica solutions in this paper. Several kinds of organic and inorganic acids are employed to neutralize diluted sodium silicate solutions to form the nano-silica solutions: formic acid, acetic acid, pro…
The combined application of HREM, HAADF STEM, and computer simulation techniques has proved to be a powerful tool for characterizing the structural modifications induced on ceria−zirconia mixed oxides by different thermochemical aging pretreatments. This is key information for better understanding the reversible chang…
Anticipation is rising that nanotechnology will bring great advances in diagnosing and treating disease1, 2, 3, 4, 5, 6, 7. But what is nanomedicine? Agreement on definition challenges even those working in the field. But recently the European Science Foundation's Forward Look on Nanomedicine defined it as “the scienc…
Insulator-metal transitions are translations characterized by a sudden change in electron transport properties from localized to itinerant behavior of electrons. In most cases, it is detected in strongly disordered semiconductors as a function of temperature with statistically distributed donors and/or acceptors. Here…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTReal-Time Neutron Scattering Study of Transient Phases in Polymer CrystallizationXiangbing Zeng, Goran Ungar, Stephen J. Spells, and Stephen M. KingView Author Information Department of Engineering Materials, University of Sheffield, Sh…
Using wide-angle X-ray scattering, we show that diblock copolymers with one crystallizable block can be oriented by crystallization in a strong magnetic field ( B = 7 T). The resulting structure consists of a stack of alternating crystalline and amorphous layers of different chemical compositions with the layer normal…
The uptake of carbon dioxide on N-(2-aminoethyl)-3-aminopropyltrimethoxysilane 1 and N-(6-aminohexyl)-3-aminopropyltrimethoxysilane 2 afforded a supramolecular network of bis-silylated ammonium carbamate salts, the hydrolytic polycondensation of which gave rise to structured hybrid materials. Subsequent loss of CO2 wa…