Materials Literature
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The interactions between globular proteins in the presence of poly (ethylene glycol) (PEG) are probed through the measurement of the protein solution second virial coefficient (B2). The solution properties of PEG are characterized for four molecular weights (400, 1000, 6000, and 12 000), providing an opportunity for q…
Fast and simple methods for the preparation of porous metal oxide networks are reported here that use readily available cellulose acetate membranes in two procedures that are expected to be of general utility. ZrO2 and TiO2 films were produced of ca. 80 μm thickness, with large pore structures (several hundred nm). Th…
We have synthesized carbon coils of nanometer-scale size by catalytic thermal chemical vapor deposition. The catalyst used is iron-coated indium tin oxide and the carbon source is acetylene. The yield of carbon coils is over 95% at a growth temperature of 700°C. The carbon coil usually consists of two or more carbon t…
X-ray diffraction methods and DSC thermal analysis have been used to investigate the structural change of nylon 6/clay nanocomposites. Nylon 6/clay has been prepared by the intercalation of ε-caprolactam and then exfoliating the layered synthetic saponite by subsequent polymerization. Both X-ray diffraction data and D…
Plastic foams have found a number of applications in the energy absorption, thermal, and acoustic markets. Here advances that have been made with extruded polystyrene, polyolefin, and polyurethane foams, and their uses, particularly in the automotive industry, are highlighted. The Figure shows a 65 % compressed foam.
The ability of an engineering plastic material to maintain properties at increased temperature is critical in many applications. Here is discussed how recent developments in catalyst technology have led to the ability to produce syndiotactic polystyrene (See Figure), the regularly alternating arrangement of pendant ph…
A nominally room temperature photochemical method, simply employing ultraviolet light- (187−254 nm) generated ozone environment, is shown to provide an efficient alternative for the removal of surfactant templates for a routine production of mesoporous silica thin films at low temperatures. The treatment concomitantly…
Self-assembled films of octadecyltrichlorosilane were patterned with regions of different chemical functionality using extreme ultraviolet interferometric lithography. Unexposed regions of the imaging layers remain terminated in methyl groups, and exposed regions are modified so as to be terminated with polar, oxygen-…
The electronic and geometrical structures of the ground and excited states of the 3d-metal dioxides ScO 2, TiO 2, VO 2, CrO 2, MnO 2, FeO 2, CoO 2, NiO 2, CuO 2, and ZnO 2 along with their singly charged negative ions have been calculated using the density functional theory with generalized gradient approximation for…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperparamagnetic Behavior in an Alkoxo-Bridged Iron(II) CubeHiroki Oshio, Norihisa Hoshino, and Tasuku ItoView Author Information Department of Chemistry, Graduate School of Science Tohoku University, Aoba-ku, Sendai 980-8578, Japan Cite this: J. Am. Chem. Soc. 2000,…
Stable icosahedral quasicrystals have been found in binary Cd-Ca and Cd-Yb systems in an as-solidified state as well as an annealed state. The icosahedral quasicrystals are identified to form at the composition of ${\mathrm{Cd}}_{85}{\mathrm{Ca}}_{15}$ and ${\mathrm{Cd}}_{84}{\mathrm{Yb}}_{16}.$ An electron diffractio…
Investigations have been carried out to clarify the binding interactions between two kinds of native DNA: one from salmon sperm (300−500 bp) and another from bacteriophage T4dC (166 kbp) and amine-terminated, diaminobutane core, poly(propylene imine) dendrimers (Astramol) of five generations (G1, G2, G3, G4, and G5).…
Der Lockruf des Goldes ertönt nicht nur in den Büchern Jack Londons, auch in den Labors der Katalyseforschung kann es zu einem Goldrausch kommen. Mit hoher katalytischer Aktivität ermöglichen Goldsalze Dominokupplungsreaktionen unter C-Heteroatom- und C-C-Verknüpfung. So sind furylsubstituierte Produkte 2 präparativ e…
This review focuses upon the following questions: a) Why are the polyelectrolytes adsorbed onto cellulosic fibres? The easiest way to describe the adsorption is as an interaction between the charges on the fibres and the charges on the polyelectrolytes. However the entropy gain upon the release of counterions to the c…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation and Characterization of Dendrimer-Encapsulated CdS Semiconductor Quantum DotsBuford I. Lemon and Richard M. CrooksView Author Information Department of Chemistry, Texas A&M University P.O. Box 30012, College Station, Texas 77842-3012 Cite this: J. Am. Chem.…
Properly designed organic molecules where a π-conjugated bridge is end-capped by an electron-donor and electron-withdrawing group (push–pull chromophores) can show, under specific conditions, frequency-upconverted lasing emission. Materials based on these dyes are therefore able to convert the emission of a cheap and…
The pore formation process of silica gel from tetraethoxysilane in the presence of citric acid (CA) was investigated. The silica gel prepared by pyrolysis of a composite of CA and silica had high specific surface area, ca. 1000 m 2 g -1 and its pore volume increased linearly with increasing CA content. In addition, th…
A new concept of polarization reversal and domain dynamics in modified ferroelectrics is presented. Accordingly, clusters with a reversed polarization within ferroelectric domains are nucleated under applied field in the vicinity of random fields around quenched defects. The random fields significantly lower the activ…
Irradiation with circularly polarized light of a film of an achiral azobenzene liquid crystalline polymer induces chirality. Circularly polarized light with opposite handedness produces enantiomeric structures. A chirooptical switch based on this phenomenon is reported.
The nuclear and magnetic structures of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ have been investigated using neutron powder diffraction and M\"ossbauer spectroscopy at temperatures between 10 and 460 K. Fe and Mo atoms are found to order on alternate sites, as expected, giving rise to a double-perovskite-type unit cell…