Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous Gold-Based Catalysis for Green Chemistry: Low-Temperature CO Oxidation and Propene OxidationByoung Koun Min and Cynthia M. FriendView Author Information Department of Chemistry and Chemical Biology and Division of Engineering and Applied Sciences, Harvard Unive…
Chitosan is a modified, natural biopolymer derived by deacetylation of chitin, a major component of the shells of crustacean. Recently, chitosan has received increased attention for its commercial applications in the biomedical, food, and chemical industries. Use of chitosan in food industry is readily seen due to its…
${\mathrm{Ta}}_{2}{\mathrm{S}}_{2}\mathrm{C}$ compound undergoes superconducting transitions at ${T}_{\mathit{cl}}=3.60\ifmmode\pm\else\textpm\fi{}0.02\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and ${T}_{\mathit{cu}}=9.0\ifmmode\pm\else\textpm\fi{}0.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The nature of successive superco…
Strontium trioxoselenate(IV), SrSeO3, crystallizes in the KClO3 structure type and is isotypic with BaSeO3, β-PbSeO3 and the mineral scotlandite (PbSO3). The Sr2+ cation is nine-coordinated by O atoms. The SrO9 polyhedra are linked together by common edges to form a three-dimensional network, with channels running alo…
Leea guineensis leaf is a medicinal herb used in folk medicine for the management of inflammatory disease conditions such as in splenomegaly in children. Because of this use, the plant was evaluated for anti-inflammatory properties. The phytochemical studies revealed the presence of saponins and glycosides as the seco…
The La and Ce ditellurides $\mathrm{La}{\mathrm{Te}}_{2}$ and $\mathrm{Ce}{\mathrm{Te}}_{2}$ are deep in the charge-density-wave (CDW) ground state even at $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We have collected their electrodynamic response over a broad spectral range from the far infrared up to the ultraviolet…
This report presents a facile approach for the low-temperature synthesis of crystalline inorganic-oxide composite hollow spheres by employing the bulk controlled synthesis of inorganic-oxide nanocrystals with polymer spheres as templates. The sulfonated polystyrene gel layer can adsorb the target precursor and induce…
Hydrogen-bonding triarylamines, 4-(N,N-bis(4-methoxyphenyl)amino)benzoic acid (TPA1), 5-(N,N-bis(4-methoxyphenyl)amino)isophthalic acid (TPA2), and N-(4-(1H-benzimidazol-2-yl)phenyl)-N,N-bis(4-methoxyphenyl)amine (BImTPA), were synthesized as radical cation precursors. TPA1 and TPA2 are readily p-doped by AgSbF(6) to…
Abstract Sixteen benzo[i]phenanthridine derivatives 8a‐p were prepared via photocyclization of cis‐trans substituted 4‐styrylquinolines in low‐to‐moderate yields. The chemical structure of the photocyclized benzo[i]phenanthridine derivatives was unambiguously elucidated by means of both spectral and analytical tools.…
We elucidate the role played by defective icosahedra on the stability of undercooled copper by using molecular-dynamics simulations. Our approach is substantiated by the level of agreement with experiments on a variety of structural properties. We show that not only perfect but also defective icosahedra, embedded in a…
We calculate the surface phase diagram of a two-dimensional hard-rod fluid confined between two hard lines. In the first stage we study a semi-infinite system consisting of an isotropic fluid in contact with a single hard line. We have found complete wetting by the columnar phase at the wall-isotropic fluid interface.…
The absorption and diffusion of organic solvents such as toluene, diesel and kerosene into natural rubber vulcanizates filled with palm kernel husk and N330 was studied at ambient temperature, using the immersion/weight gain method. The results showed no further weight change after 24 h The absorption and the diffusio…
The mechanical properties, such as Young's modulus, yield strength, and the elongation at breakage, were investigated for several sulfur-containing biopolymers P(3HB-co-3MP). A series of P(3HB-co-3MP) samples with 3MP unit content ranging from 6.6 to 39.1 mol-% was biosynthesized by fermentation using the PHA-synthesi…
Extended tapes of cyclic water hexamers are formed in a one-dimensional copper(II) complex bridged by oxalate with a rare mono, bidentate coordination mode. The water tapes are stabilized by the hydrogen bond interactions between uncoordinated oxalate oxygen atoms and water molecules. Magnetic analysis reveals weak fe…
Ribonuclease (RNase) HI from the psychrotrophic bacterium Shewanella oneidensis MR-1 was overproduced in Escherichia coli, purified, and structurally and biochemically characterized. The amino acid sequence of MR-1 RNase HI is 67% identical to that of E. coli RNase HI. The crystal structure of MR-1 RNase HI determined…
We studied the nanoscale structure of the short-range incommensurate magnetic order in ${\text{La}}_{1.5}{\text{Sr}}_{0.5}{\text{CoO}}_{4}$ by elastic neutron scattering. We find that magnetic diffuse scattering is isotropic in the $a\text{\ensuremath{-}}b$ plane, in contrast with the naive expectation based on the po…
Mature amyloid fibrils are believed to be formed by the lateral association of discrete structural units designated as protofibrils, but this lateral association of protofibrils has never been directly observed. We have recently characterized a thioesterase from Alcaligenes faecalis, which was shown to exist as homome…
Beta-cyclodextrin and its permethylated derivatives form 2:1 inclusion complexes with tetrakis- and octakis(4-carboxyphenoxy)phthalocyanines 1-4, reducing their aggregation tendency and promoting their sensitization of singlet oxygen formation in aqueous media.
The rotational molecular dynamics of water confined to layered oxide materials with brucite structure was studied by dielectric spectroscopy in the frequency range from 10(-2) to 10(7) Hz and in a broad temperature interval. The layered double hydroxide samples show one relaxation process, which was assigned to fluctu…
It is natural to associate the tachocline with the region of generation of a strong toroidal field by the winding-up of a weaker poloidal component. Here I discuss the break-up and subsequent escape of such a field via magnetic buoyancy instabilities. I consider the different modelling approaches that have been employ…