Materials Literature
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The achievement of a true nanotechnology is regarded as one of the Holy Grails of modern science. To achieve this will require the construction by synthesis or self-assembly of complex functional nanoarchitectures. Such structures might contain combinations of one-, two-, and three-dimensional phenylene nanostructures…
This paper reports a dendritic system which is capable of forming both one-component and two-component gels--interestingly the addition of the second component can either increase or decrease the degree of gelation, depending on dendritic generation.
The thermal conductivity $\ensuremath{\kappa}(T)$ of the $R\mathrm{V}{\mathrm{O}}_{3}$ crystals was measured. At $T>{T}_{\ensuremath{\infty}}$, $R\mathrm{V}{\mathrm{O}}_{3}$ crystals conduct heat like a glass; the phonon contribution to $\ensuremath{\kappa}(T)$ is completely suppressed by spin and orbital fluctuati…
Mg and Nb-doped Mg films were deposited by rf magnetron sputtering. Morphological and structural analysis were performed by scanning electron microscopy and x-ray diffraction. The desorption kinetics has been investigated by using a Sievert-type apparatus. The overall activation energy and the reaction order controlli…
The crystal structure and magnetic properties of SmCo7−xHfx (x=0.05,0.1,0.2,0.3) compounds were studied by means of x-ray powder diffraction and magnetic measurements. The as-cast compounds SmCo7−xHfx with x=0.1 and 0.2 crystallize in the TbCu7-type structure with the space group P6∕mmm. According to the structure ref…
Abstract Summary: The communication provides a novel and alternative route to generate chemically tethered binary polymer‐brush pattern through two‐step surface‐initiated atomic‐transfer radical polymerization (SI‐ATRP). Polymer brush‐1 was prepared by SI‐ATRP, passivated by a reaction with NaN 3 , and etched with UV…
We use ab initio molecular dynamics simulations to study a sample of liquid silica containing $3.84\phantom{\rule{0.3em}{0ex}}\mathrm{wt}\phantom{\rule{0.2em}{0ex}}%\phantom{\rule{0.3em}{0ex}}{\mathrm{H}}_{2}\mathrm{O}$. We find that, for temperatures of 3000 and $3500\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, water is a…
Pb ( Nb 0.02 Zr 0.2 Ti 0.8 ) O 3 thin films with thickness of 900nm were spincoated on platinized silicon substrate using the sol–gel method. X-ray diffraction and field emission scanning electron microscopy show that the films are highly a-axis-oriented with columnar structure. A large remnant polarization (Pr+) ∼92.…
Abstract Pulp and paper manufacturing constitutes one of the largest industry segments in the United States in term of water and energy usage and total discharges to the environment. More than many other industries, however, this industry plays an important role in sustainable development because its chief raw materia…
Dynamical mean field theory is employed to calculate the properties of multilayered inhomogeneous devices composed of semi-infinite metallic lead layers coupled via barrier planes that are made from a strongly correlated material (and can be tuned through the metal-insulator Mott transition). We find that the Friedel…
The refractive indices and linear electro-optic (EO) properties of (1−x)Pb(Mg1∕3Nb2∕3)O3−xPbTiO3 single crystals were investigated over a broad composition range. The orientation and temperature effect on the EO coefficients were also examined. Large EO coefficients rc were observed near the morphotropic phase boundar…
Z -scan and pump-probe measurements with ultrafast, 800nm laser pulses were used to compare the ultrafast optical nonlinearities of VO2 nanoparticles and thin films in both semiconducting and metallic states. In the metallic state, both the nanocrystals and thin films exhibit a positive, intensity-dependent nonlinear…
ZnO single-crystal microtubes were fabricated using an encapsulated microwave growth method. The ZnO crystals are grown in hexagonal hollow tube form with a well faceted end and side surfaces, which have cross-sectional dimensions of 100to250μm, lengths of 3–5mm, and wall thickness of 1–2μm. Under optical excitation,…
Synthetic polymers are of increasing interest as therapeutic agents owing to their enhanced pharmacokinetic profiles relative to small molecule drugs. Multifunctional polymers are now being prepared that can ‘hide’ biologically active compounds, such as cytotoxic agents, therapeutic proteins or nucleic acids, until th…
Highly crystalline anatase nanoparticles of 5-20 nm in size were obtained by reacting titanium tetraisopropoxide with common ketones and aldehydes under solvothermal conditions.
Abstract Dendrimers, the aesthetically beautiful macromolecules displaying a variety of potentially useful architecture‐induced properties, are traditionally assembled in solution. However, since 1988, a number of dendritic structures have been assembled on insoluble organic and inorganic polymers, and thus dendronize…
We have found that laminates of longitudinally magnetized magnetostrictive TERFENOL-D layersand a longitudinally poled piezoelectric Pb(Mg1∕3Nb2∕3)O3-PbTiO3 crystal have a giant magnetoelectric voltage coefficient of >430mV∕Oe under a low magnetic bias. Under a resonant drive operation at a frequency of 82.1 kH…
Barium stannate titanate [Ba(SnxTi1−x)O3, x=0.1, 0.2, 0.3, and 0.4] ceramics were prepared using a conventional solid-state reaction process. Their dielectric properties were measured under direct current bias fields ranging from 0to2.5kV∕cm. A transformation from normal to relaxor ferroelectrics was observed when x⩾0…
We consider in this article the Cahn–Hilliard equation endowed with dynamic boundary conditions. By interpreting these boundary conditions as a parabolic equation on the boundary and by considering a regularized problem, we obtain, by the Leray–Schauder principle, the existence and uniqueness of solutions. We then con…
Using hard x-ray (HX; $h\ensuremath{\nu}=5.95\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$) synchrotron photoemission spectroscopy (PES), we study the intrinsic electronic structure of ${\mathrm{L}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{S}\mathrm{r}}_{x}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ (LSMO) thin films. Compari…