Materials Literature
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External and reversible control of the size and surface energy of the pores in mesoporous architectures has been achieved. The method involves modification of mesoporous silica by atom transfer radical polymerization of N ‐isopropyl acrylamide (the precursor to a stimuli‐ responsive polymer). The resulting polymer‐gra…
At a generic quantum critical point, the thermal expansion $\ensuremath{\alpha}$ is more singular than the specific heat ${c}_{p}$. Consequently, the ``Gr\"uneisen ratio,'' $\ensuremath{\Gamma}=\ensuremath{\alpha}/{c}_{p}$, diverges. When scaling applies, $\ensuremath{\Gamma}\ensuremath{\sim}{T}^{\ensuremath{-}1/(\ens…
Mesoporous WO 3 films with a lamellar structure (see Figure) have been synthesized by electrodeposition using sodium dodecyl sulfate (SDS) as a templating agent. Compared to non‐porous WO 3 prepared with isopropanol instead of SDS, lamellar phase mesoporous WO 3 showed higher photocatalytic activity and greater curren…
Abstract Dielectric relaxation study of binary mixtures of poly(vinyl pyrrolidone) (PVP) ( M w = 40 000 g mol −1 ) and poly(ethylene glycol)s (PEGs) ( M n = 200, 400 and 600 g mol −1 ) with concentration variation was carried out in dilute solutions of benzene at 10.1 GHz and 35 °C. The average relaxation time τ o , c…
Abstract The copolymer P(AM‐ co ‐4VP) of acrylamide (AM) and 4‐vinylpyridine (4VP) was synthesized by radical copolymerization in solution, and then the copolymer was quaternarized using dimethyl sulfate to produce cationic P(AM‐ co ‐4VP) (CPAV), a cationic polyacrylamide containing quaternary pyridine salt. Two serie…
Abstract Uniform hollow silicalite-1 spheres with a high intact ratio and good mechanical stability were fabricated through a novel and effective approach, which involved the seed-induced hydrothermal crystallization of mesoporous silica microbeads in an alkaline aqueous solution.
Abstract Laser Raman spectroscopy, in conjunction with an optical high‐pressure cell, was used to investigate the poly(methyl methacrylate)‐carbon dioxide system. The Raman shifts associated with carbon dioxide molecules in the gas phase and those dissolved in the polymer were used to derive sorption kinetics of carbo…
Using high-resolution core-level photoemission measurements, we show that two different metastable species exist on a $\mathrm{Si}(111)\ensuremath{-}(7\ifmmode\times\else\texttimes\fi{}7)$ surface, instead of only one as suggested in the literature. One metastable species has a finite lifetime and is composed of both…
Abstract Epoxy/clay nanocomposites were prepared using a conventional diglycidyl ether of bisphenol A (DGEBA) epoxy, cured with diethyltoluene diamine (DETDA). The nanocomposites were characterized by dynamic mechanical analysis. A modest increase in glass transition temperature and significant increase in storage mod…
We introduce a spectral density functional theory which can be used to compute energetics and spectra of real strongly--correlated materials using methods, algorithms and computer programs of the electronic structure theory of solids. The approach considers the total free energy of a system as a functional of a local…
We analyze the electronic structure of group II-VI semiconductors obtained within LMTO approach in order to arrive at a realistic and minimal tight binding model, parameterized to provide an accurate description of both valence and conduction bands. It is shown that a nearest-neighbor $sp^3d^5$ model is fairly suffici…
We introduce a coarse-grained model for atomic glass formers. Its elements are physically motivated local microscopic dynamical rules parameterized by observables. Results of the model are established and used to interpret the measured behaviors of supercooled fluids approaching glass transitions. The model predicts t…
A theoretical model is presented for low-frequency magnetoelectric (ME) effects in bilayers of magnetostrictive and piezoelectric phases. A novel approach, the introduction of an interface coupling parameter k, is proposed for the consideration of actual boundary conditions at the interface. An averaging method is use…
We obtain an effective parametrization of the bulk electronic structure of InP within the Tight Binding scheme. Using these parameters, we calculate the electronic structure of InP clusters with the size ranging upto 7.5 nm. The calculated variations in the electronic structure as a function of the cluster size is fou…
We study theoretically the interaction between soft magnetic and superconducting films. It is shown that the vortex induces a magnetization distribution in the magnetic film, thus modifying the magnetic field as well as the interactions with e.g. Bloch walls. In particular, the field from the vortex may change sign cl…
[reaction: see text] meso-Aryloxy- and alkoxy-substituted porphyrins were conveniently synthesized by direct reactions of meso-halogenated porphyrins with alcohols via palladium-catalyzed C-O cross-coupling reactions. Using a combination of palladium precursor Pd(OAc)(2) or Pd(2)(dba)(3) and phosphine ligand DPEphos o…
(TBA, H)Ca 2 Nb 3 O 10 nanosheets have been obtained via delamination of a precursor-layered perovskite KCa 2 Nb 3 O 10 . A confined structural characterization was performed using transmission electron microscopy. It has been found that nanosheet fragments with a dimension along the sheet normal consisting of no more…
Adsorption of water vapor on mesoporous materials such as MCM-41, MCM-48, KIT-1, SBA-1, and SBA-15, which have different pore sizes and shapes, was investigated by using a gravimetric system. In addition, adsorption of water vapor on KIT-1 mesoporous material was examined at 293.15 to 353.15 K. A hybrid isotherm model…
Temperature-programmed desorption experiments show that acetone chemisorbs on nanotubes while physisorption occurs on graphite. Computed high binding energies for chemisorption using hybrid quantum mechanical and semiempirical calculations are in good agreement with the experimental thermal desorption data. The strong…
It is well known that copper-based perovskite oxides rightly enjoy consensus as high-temperature superconductors on the basis of two signatures: Meissner effect and zero resistance. In contrast, I provide over twenty signatures for room temperature superconductivity in carbon nanotubes. The one-dimensionality of the n…