Materials Literature
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The crystal and magnetic structures of ${\mathrm{LaTiO}}_{3}$ have been studied by x-ray and neutron-diffraction techniques using nearly stoichiometric samples. We find a strong structural anomaly near the antiferromagnetic ordering ${T}_{N}=146\mathrm{K}.$ In addition, the octahedra in ${\mathrm{LaTiO}}_{3}$ exhibit…
Two macromonomers containing ethylene oxide (EO) segments with different degrees of polymerization (DP PEO = 5 and 23), capped by a methoxy and a methacrylate group (PEOMA), were polymerized by atom transfer radical polymerization (ATRP) in organic solvents. In addition to the direct preparation of densely grafted bru…
We report here on a theoretical model for the electronic structure and transport properties of superlattice nanowires, considering their cylindrical wire boundary and multiple anisotropic carrier pockets. The thermoelectric properties of superlattice nanowires made of various lead salts (PbS, PbSe, and PbTe) are inves…
Porous and high-surface-area materials are of interest to many scientific communities. Templating pathways can be used to synthesize such materials with a high degree of control over their structural and textural properties. As templates molecular or supramolecular units are added to the synthesis mixture. They are oc…
ADVERTISEMENT RETURN TO ISSUEPREVAddition & Corre...Addition & CorrectionORIGINAL ARTICLEThis notice is a correctionEnhancing the Activity of Fuel-cell Reactions by Designing Three-dimensional Nanostructured Architectures: Catalyst-modified Carbon−Silica Composite AerogelsM. L. Anderson, R. M. Stroud, and D. R. Roliso…
In this paper, we analyze the light transmission from a twisted nematic liquid crystal (NLC) and we propose two accurate and very direct optical methods to measure the azimuthal anchoring energy. In both of them, a monochromatic beam of wavelength lambda with a polarization vector that rotates at an angular frequency…
Abstract Epoxy–clay nanocomposites were synthesized using two organoclays cured with different chemicals at different temperatures. Interlayer distance of the clay layers and curing process were investigated by X‐ray diffraction and infrared spectra. The clay treated with facilitated curing agent, 2,4,6‐tris[(dimethyl…
This paper reports the characterization of a photosensitive benzocyclobutene (BCB), a low dielectric constant spin‐on polymer for use as interlayer dielectric in the microelectronics industry. Research work is divided into three main sections. First, BCB thin film characterization was done to investigate the effects o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStumuli-Responsive Organogel Based on Poly(N-propargylamide)Ryoji Nomura, Katsuhiro Yamada, Junichi Tabei, Yoshihito Takakura, Toshikazu Takigawa, and Toshio MasudaView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 6…
Abstract Blown extruded polyethylene films without stabilizers have been exposed outdoors under severe weathering conditions in the Sahara. The chemical aspect of aging has been followed by IR spectroscopy. The mechanical aspect of aging has been monitored by means of a nondestructive method. It consists of measuring…
Additives in Water-borne Coatings covers both current technology and the future prognosis for the key additives used in water-borne coatings today. It brings together international experts to provide a comprehensive, practical overview of the field, its direction, and selection of key additives currently employed for…
There are three clear new trends in solution crystallization. The first is crystallizer control, with the aim of better crystals by means of measuring supersaturation and crystal sizes in‐line/on‐line. The second trend is the molecular modeling of crystals. The focus is on finding “tailor made additives” by computer s…
Abstract Poly(ϵ‐caprolactone) (PCL) and poly[( R )‐3‐hydroxybutyrate] ( R ‐PHB) films with pores and hydrophilic surfaces were prepared by the water extraction of poly(ethylene oxide) from as‐cast blend films (1:1) and by the alkali treatment of as‐cast nonporous films, respectively. These films, as well as as‐cast no…
Abstract Recent developments in topological polymer chemistry are outlined. First, nonlinear polymer topologies are systematically classified on the basis of topological considerations of constitutional isomerism in a series of alkanes (C n H 2 n +2 ), monocycloalkanes (C n H 2 n ), and polycycloalkanes (C n H 2 n −2…
Abstract An inverse emulsion method was used to prepare the chitosan microspheres, which were crosslinked with epichlorohydrin between the hydroxyl groups under protection of amino groups to obtain crosslinked chitosan resin. Further chemical modification with glycidyl trimethylammonium chloride was used to form the q…
An aqueous-based process is reported for surface functionalization and grafting of anticoagulant and cell attachment moieties, such as heparin and/or arginine-glycine- aspartate (RGD) onto the lumenal surface of a prefabricated cardiovascular graft (5 mm i.d.) made of poly(carbonate- urea)urethane (MyoLink). It is a t…
Surface aggregation states in miscible blends of monodisperse polystyrene (PS) and poly(vinyl methyl ether) (PVME) were studied by X-ray photoelectron spectroscopy (XPS) in conjunction with neutron reflectivity (NR). In the case of symmetric blends in terms of degree of polymerization, N, PVME and PS were preferential…
A series of heterometal cyclic tetranuclear complexes [Cu(II)LM(II)(hfac)](2) (M(II) = Zn (1), Cu (2), Ni (3), Co (4), Fe(5), and Mn (6)) have been synthesized by the assembly reaction of K[CuL] and [M(II)(hfac)(2)(H(2)O)(2)] with a 1:1 mole ratio in methanol, where H(3)L = 1-(2-hydroxybenzamido)-2-((2-hydroxy-3-metho…
Abstract Thiol‐terminated poly(ethylene oxide) (PEO) was synthesized using two different approaches: esterification of terminal hydroxyl groups with mercaptoacetic acid and amidation using N ‐hydroxysuccinimidyl PEO (NHS–PEO) and cysteine. The reaction of hydroxyl‐terminated PEO with mercaptoacetic acid was carried ou…
The fiber formation mechanism of Bombyx mori silk fibroin by silkworm is essentially the structural change from silk I (the silk fibroin structure before spinning in the solid state) to silk II (the silk fibroin structure after spinning) under external forces in both silk gland and spinneret of B. mori silkworm. Recen…