Materials Literature
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Titania−silica mixed oxides are intriguing catalysts and catalyst supports since their surface reactivities depend strongly on composition and homogeneity of mixing. In this review, the synthesis, characterization, and catalytic activity of titania−silica are described, and important structure/property relationships f…
The lamellar compound ${\mathrm{CuInP}}_{2}{\mathrm{S}}_{6}$ is presented as an unusual example of a collinear, two-sublattice ferrielectric system. Single-crystal x-ray diffraction is used to study the thermal evolution of the polar character of its structure. The results are consistent with the occurrence of a first…
Using a modified definition, the average degree of branching,, the fraction of branchpoints,, as well as the fractions of various structural units are calculated as a function of conversion of double bonds for hyperbranched polymers formed by self-condensing vinyl polymerization (SCVP) of monomers (or “inimers”) with…
This article presents a review of constitutive theories, mechanics, and structural applications of shape memory alloys. Although these materials possess a number of unique features, this review is concerned with the shape memory effect and superelasticity, since they are most often discussed in the context of possible…
It is well established that sequence templates such as those in the PROSITE and PRINTS databases are powerful tools for predicting the biological function and tertiary structure for newly derived protein sequences. The number of X-ray and NMR protein structures is increasing rapidly and it is apparent that a 3D equiva…
MCM-41 periodic mesoporous silicates were synthesized using cetyltrimethylammonium bromide, and their pore sizes were tailored by postsynthesis hydrothermal treatment method of Khushalani et al., allowing us to obtain large-pore MCM-41 samples with a high degree of structural ordering. It was shown that the pore size…
Simple synthesis methods for mesoporous fibers and powders by rapid evaporation of hydrolyzed silicon alkoxide−surfactant solutions are described. Mesoporous fibers are prepared by dry spinning, and mesoporous powders by spray drying of alkoxide−surfactant solutions. Precursor solutions, containing fully hydrolyzed te…
Alternate layer-by-layer assembly of colloidal SiO 2 particles with polycations has been investigated by quartz crystal microbalance (QCM), scanning electron microscopy (SEM), and atomic force microscopy (AFM). QCM measurement confirmed the high regularity and reproducibility of the assembling process that depends on…
Abstract Recent developments in the study of the intercalation of organoammonium ions into layered silicates are reviewed. The new developments of the applications of the organoammonium-exchanged layered silicates include the selective adsorption of toxic compounds from water, the immobilization of photo and electroac…
Bismuth sodium titanate (Bi 0.5 Na 0.5 TiO 3 , BNT) with 0–6 at.% lanthanum was prepared by the conventional mixed oxide method. Each composition was calcined at 800–900°C for 2–5 h to form a pure perovskite phase. Green pellets were sintered at 1050–1150°C for 1–4 h to obtain dense ceramics with at least 95% of theor…
In this review, we describe four approaches to the materials synthesis of organized inorganic matter. These include the use of self-assembled organic templates (transcriptive synthesis), cooperative assemblies of templates and building blocks (synergistic synthesis), spatially restricted reaction fields (morphosynthes…
Parametrization of a force field capable of quantitatively describing the gas, liquid and crystal phases of alcohols, ethers and polyethers is described. Two applications are reported, the first employing atomistic simulations to study PVT (pressure, volume, temperature) and cohesive properties of oligomeric poly(ethy…
The use of chemical solution deposition for the fabrication of perovskite thin films is reviewed. A variety of approaches including sol−gel, chelate, and metalloorganic decomposition have all been employed with success in the preparation of these materials. For a number of perovskite compounds, thin-film properties th…
The growth of p-type ZnO film was realized for the first time by the simultaneous addition of NH 3 in carrier hydrogen and excess Zn in source ZnO powder. The resistivity was typically 100 Ω·cm. A model showing nitrogen incorporation suggests the possibility of realizing p-type ZnO film of low resistivity by optimizin…
We have used Brillouin light scattering and ellipsometry to measure the glass transition temperature ${T}_{g}$ of thin polystyrene (PS) films as a function of the film thickness $h$ for two different molecular weights ${M}_{w}.$ Three different film geometries were studied: freely standing films, films supported on a…
The complete 1,751,377-bp sequence of the genome of the thermophilic archaeon Methanobacterium thermoautotrophicum deltaH has been determined by a whole-genome shotgun sequencing approach. A total of 1,855 open reading frames (ORFs) have been identified that appear to encode polypeptides, 844 (46%) of which have been…
MCM-41 siliceous molecular sieves were used to test the applicability of the Kelvin equation for nitrogen adsorption in cylindrical pores of the size from 2 to 6.5 nm. It was shown that the Kelvin equation for the hemispherical meniscus, corrected for the statistical film thickness, is in quite good agreement with an…
We report a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 Å. The narrow photoluminescence (fwhm ≤ 40 nm) from these composite dots spans most of the visible spectrum from blue through red with quantum yields of 30−50% at room temperature. We characte…
The synthesis of side-chain-functionalized polyaspartamides as potential carrier polymers for medicinal agents is described. The nucleophilic ring opening in poly-D,L-succinimide, mediated by O,O′-bis(2-aminopropyl)poly(ethylene oxide) (nominal molecular mass is 600) and ethanolamine under carefully controlled experim…
Spatially associated red (Typic Hapludalf) and black (Vertic Eutropept) soils developed on the Deccan plateau in the Western Ghats of India were analysed for clay mineralogy and also physical properties relating to shrink–swell. This was done in order to examine a possible correlation between shrink–swell phenomena an…