Materials Literature
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Two-dimensional-hexagonal mesoporous silica thin films with aligned mesochannels in one direction at large scales will be favorably applied in optics, electronics, separation technologies, and so forth. We propose herein a new photo-aligning and micropatterning technique for mesochannels of a silica thin film using a…
Hyperbranched polyethoxysiloxanes were prepared via a one-pot synthetic route based on a condensation reaction of tetraethoxysilane with acetic anhydride in the presence of an organotitanium catalyst. Volatile compounds can be fully removed using a thin-film evaporator. According to size-exclusion chromatography and v…
High-performance stationary phases, which provide high resolutions and are stable at high temperatures, are of significant importance in gas chromatographic analysis. Carbon nanotubes are nanosized carbon-based sorbents that have a high surface area and a large aspect ratio and are known to be stable at high temperatu…
A series of hyperbranched poly( l -lactide) (PLLA) copolymers were prepared by copolymerization of dilactide with 2,2-bis(hydroxymethyl)butyric acid (BHB) as an AB 2 comonomer via a combined ring-opening polymerization/AB 2 polycondensation. Stannous 2-ethylhexanoate was used as a catalyst. Apparent molecular weights…
We have designed organic ligands able to adsorb on the surface of CdSe-ZnS core-shell quantum dots and switch the luminescence of the inorganic nanoparticles in response to hydroxide anions. These compounds incorporate a [1,3]oxazine ring within their molecular skeleton, which reacts with the nucleophilic hydroxide an…
CDP-6-deoxy-L-threo-D-glycero-4-hexulose-3-dehydrase (E1), along with its reductase (E3), catalyzes the unusual C-3 deoxygenation of CDP-6-deoxy-L-threo-D-glycero-4-hexulose to form CDP-3,6-dideoxy-L-threo-D-glycero-4-hexulose in CDP-ascarylose biosynthesis [Chen et al. (1996), Biochemistry, 35, 16412-16420]. This dim…
The study is concerned with the heat and moisture transport in a ventilated fabric-skin system composed of a microclimate air annulus that separates an outer cylindrical fabric boundary and an inner oscillating cylinder representing human skin boundary for open and closed aperture settings at the ends of the cylindric…
α-GaO(OH) thin films obtained by the sol–gel process have been characterized. An x-ray diffraction study confirmed that the films were crystalline with orthorhombic structure. The average crystallite size of the thin films was about ∼2–3 nm as revealed by transmission electron microscope and x-ray diffraction studies.…
We report transport and magnetic properties of a different class of highly conducting polyaniline, doped with boron trihalides $\mathrm{B}{X}_{3}$ ($X=\mathrm{F}$, Cl, and Br). In order to understand the transport mechanism we analyze the temperature dependence of resistivity of a large number of samples, made by pell…
Highly oriented ZnSe nanorods were grown on a ZnSe epilayer on GaAs(001) substrate by metalorganic chemical vapour deposition without any introduced catalysts. Cathodoluminescence spectra and images of individual nanorods, projecting from the buffer layer, were obtained at various temperatures down to 4.5 K in a scann…
Carbon nanotubes (CNTs) and nanofibres (CNFs) are grown on bulk-micromachined silicon surfaces by thermal and plasma-enhanced chemical vapour deposition (PECVD), with catalyst deposition by electron beam evaporation or from a colloidal solution of cobalt nanoparticles. Growth on the peaked topography of plasma-etched…
We report a fundamentally new growth mechanism for single crystalline nanobelts, namely, the growth and coalescence of nanobranches. The growth process of the nanobelts includes four typical steps such as nucleation and growth of the stem, nucleation and growth of the nanobranches at the expense of the stem, widening…
Different from the conventional liquid theory, experimental evidence suggests that there might be discontinuous liquid-liquid (L-L) structure transitions for some alloys. By the resistivity experiments, it is assumed that a temperature-induced L-L structure transition might occur in liquid lead-bismuth ( PbBi ) alloy.…
Submonolayers of nickel oxide were grown on the Ag(001) surface by evaporation of Ni in the presence of O 2 at a pressure of 1 × 10 −6 mbar. In the early stages of deposition, two-dimensional oxide islands with a (2 × 1) periodicity grow on Ag(001). After annealing at about 500 K, the (2 × 1) single atomic layer trans…
Epitaxial ZnO nanowires and random-growth-oriented nanobelts were grown on c -plane sapphire with and without a pre-coated ZnO epilayer film. On the pre-coated ZnO epilayer, ZnO nanowires are vertically aligned with good in-plane alignment as a result of homoepitaxy, whereas on the bare c -plane sapphire, besides a fe…
Low-temperature spin dynamics in the face-centered-icosahedral Zn-Mg-Tb quasicrystal has been investigated by inelastic neutron scattering around its spin-glass-like freezing temperature $({T}_{\mathrm{f}}\ensuremath{\simeq}5.8\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. A single broad inelastic peak, centered at $\ensure…
We present a molecular-level simulation study of the effects of confinement on chemical reaction equilibrium in nanoporous materials. We use the reaction ensemble Monte Carlo (RxMC) method to investigate the effects of temperature, nanopore size, bulk pressure, and capillary condensation on the nitric oxide dimerizati…
A dimeric capsule of coordination bowl 1 encapsulated a nine-residue peptide (Trp-Ala-Glu-Ala-Ala-Ala-Glu-Ala-Trp; 2) within the large hydrophobic cavity in water, and stabilized the alpha-helical conformation of bound 2. An NMR titration experiment revealed that monomeric bowl 1 recognized two Trp residues at the bot…
The New York Structural GenomiX Research Consortium (NYSGXRC) has selected the protein coded by yxaF gene from Bacillus subtilis as a target for structure determination. The yxaF protein has 191 residues with a molecular mass of 21 kDa and had no sequence homology to any structure in the Protein Data Bank (PDB) at the…
Near normal incident infrared reflectivity spectra of (001) SrTi1−xNbxO3 single crystal have been measured at different temperatures in the frequency region between 100 and 6000 cm−1. The optical parameters of phonons and plasmons are obtained on the basis of the double-damping extended Drude model. The lowest frequen…