Materials Literature
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The amino (N-telo) and carboxyl (C-telo) telopeptides of type I collagen play crucial roles, in vivo and in vitro, in the assembly of collagen fibrils, regulating the axial alignment of the molecules within a fibril, azimuthal orientations of neighboring molecules, and cross-link formation. High-resolution structures…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNew Insights into the Structure of Poly(p-phenylene terephthalamide) from Neutron Fiber Diffraction StudiesK. H. Gardner, A. D. English, and V. T. ForsythView Author Information DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880; Department of…
This study examined the mechanical properties of a series of Ti-Hf alloys. Titanium alloys with 10 to 40 mass % Hf were made with titanium and hafnium sponge in an argon-arc melting furnace. Specimens cast into magnesia-based investment molds were tested for yield strength, tensile strength, percentage elongation, and…
Synchrotron radiation was used to investigate the self-assembly in two comb-shaped supramolecules systems consisting of octyl gallate (OG), i.e., 1-octyl-3,4,5-trihydroxybenzoate, hydrogen bonded to the pyridine groups of polyisoprene- block -poly(vinylpyridine) diblock copolymers. In the case of the 1,2-polyisoprene-…
We have investigated polyelectrolyte multilayers of poly(styrene sulfonate) (PSS) and poly(allylamine hydrochloride) in contact with D2O by neutron reflectometry. The study particularly focuses on the changes in the solvent fraction of the system upon addition of a layer. When the layers are deposited at a low salt co…
Palladium nanoparticles supported on lanthanum-stabilized alumina were prepared by flame spray pyrolysis. The as-prepared materials were characterized by high-resolution transmission electron microscopy, CO chemisorption, nitrogen adsorption, X-ray diffraction and temperature programmed reduction. These materials were…
SiC particles are coated with multi-walled carbon nanotubes using a simple chemical vapor deposition process. This new type of micro/nanoscale hybrid reinforcement combines the characteristics of carbon nanotubes and the micrometer-sized SiC particles. Using this hybrid reinforcement in an epoxy composite produced a s…
Abstract A 1D double‐chain assembly based on the monosubstituted Keggin polyoxometalate (POM) with pendant ligands and of formula {[Ag 2 (bppy) 3 ][Ag(bppy) 2 ][Ag(bppy)] 2 PW 11 Co(bppy)O 39 }·2H 2 O ( 1 ) [bppy = 5‐(4‐bromophenyl)‐2‐(4‐pyridinyl)pyridine] has been synthesised and characterised. The crystals of 1 bel…
A new ferromagnetic nickel(II) hexameric structure based on the versatile N,O3-ligand 2,2',2"-nitrilotribenzoic acid has been prepared and characterised by X-ray crystallography and magnetic measurements; the compound represents a rare example of a nickel cluster with a dicubane-like core having only oxygen bridges.
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The doping induced insulator-metal transition in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ti}{\mathrm{O}}_{3}$ is studied using the ab initio local density approximation (LDA) and DMFT method. Combining the LDA bandstructure for the actual, distorted structure found recently with multiorbital DMFT to…
Abstract Summary: Nanocomposite materials were obtained by blending multi‐wall carbon nanotubes (CN), obtained by acetylene catalytic chemical vapour deposition (CVD) on Co/Fe‐modified NaY zeolite, with syndiotactic poly(propylene) (sPP). The nanotubes, well dispersed in the polymer matrix, favour the crystallization…
Water quality is commonly reported with respect to the minerals that comprise the total dissolved solids, often together with COD, BOD, pH and other components. For ease of use by consumers, the quality parameters are mostly related to usage, i.e. water quality for domestic use, livestock or irrigation, etc. When diat…
Abstract Summary: The size and concentration of free‐volume holes of two kinds of montmorillonite (MMT)/styrene‐butadiene rubber (SBR) nanocomposites were investigated by positron annihilation lifetime spectroscopy (PALS). Strong interfacial interaction caused an apparent reduction of the free‐volume fraction of rubbe…
An "X-shaped" two-dimensional electrooptic (EO) chromophore with extended orthogonal conjugation was designed and synthesized. Self-assembled thin films of this chromophore were fabricated via layer-by-layer chemisorptive siloxane-based self-assembly. The films exhibit a dramatically blue-shifted optical maximum (325…
A series of titania−silica xerogels was prepared using nonhydrolytic sol−gel routes. The parameters explored were the nature of the oxygen donors (alkoxides or diisopropyl ether), the amount of liquid phase in the gel, the titanium content, the reaction time, and the reaction temperature. The samples were characterize…
A new bifunctional octa-coordinating ligand containing an aminobenzyl moiety, DO3APABn (H4DO3APABn = 1,4,7,10-tetraazacyclododecane-4,7,10-triacetic-1-{methyl[(4-aminophenyl)methyl]phosphinic acid}), has been synthesized. Its lanthanide(III) complexes contain one water molecule in the first coordination sphere. The hi…
Polyelectrolyte multilayer microcapsules of two different sizes consisting of poly(allylamine hydrochloride) and poly(styrenesulfonate) assembled on melamine formaldehyde cores were investigated by means of scanning (SEM) and transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), and scanni…
Further studies of the hydrophobic force in foam films were carried out, including the effect of added inorganic electrolyte. We used a thin film balance of Scheludko-Exerowa type to obtain the disjoining pressure isotherms of the foam films stabilized by 10(-4) M sodium dodecyl sulfate in varying concentrations of so…
We describe the synthesis of quantum-dot (QD) doped silica microspheres and a method by which it is possible to fine-tune the position of the whispering gallery modes (WGMs) produced by the fluorescence emission of CdSe@ZnS doped silica microspheres (5.06 mum in diameter). The method is based on small perturbations to…