Materials Literature
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Abstract The rheological behavior and crosslinking kinetics of model filled rubber compounds during curing were investigated. The effect of chemical composition of monodisperse size particles, prepared by emulsifier‐free emulsion polymerization, on dynamic moduli and gelation time of the filled compounds was studied.…
Different types of magnetic structures were described in terms of a propagation vector and some of its associated basis vectors. Group Theory calculations were used for magnetic symmetry analysis. The use of symmetry in the proper descripton and solution of magnetic structures was demonstrated.
The synthesis of a metal-free form of texaphyrin, an aromatic porphyrin-like macrocycle, is described. Previously, texaphyrins could only be obtained reproducibly in the form of metal complexes. Using ferrocenium cation as the oxidizing agent and starting with a reduced porphyrinogen-like nonaromatic form of texaphyri…
We investigated major physical-chemical characteristics and benthic algae of different alpine lotic systems comprising streams and lake outlets of rhithral and kryal origin over an annual cycle. We also evaluated the structure of the algal communities and its relation to environmental characteristics for the different…
BACKGROUND/AIMS: The aim of this article is to propose a new way to measure the mechanical behaviour of skin by using optical analysis software. Some examples on scars and stretch marks show the validity and the prospects of such a method. METHODS: Software is used to compare two states of deformation. The user takes…
Neutral atomic oxygen (AO)—the dominant atmospheric species at typical low Earth orbit altitudes—is responsible for the erosion, or other degradation, of many satellite materials. Therefore, AO has become an important consideration for spacecraft designers and manufacturers. The study of AO is also of interest to atmo…
The resistivity ${\ensuremath{\rho}}_{\mathrm{xx}},$ the Hall effect, and magnetization $\mathbf{M}$ of a single crystal of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ (SFMO) have been studied in a wide temperature range. The ordinary Hall effect (OHE) is negative, identifying electrons as charge current carriers, while t…
In a fusion blanket design, ceramic coating on structural materials has been considered to be used as a tritium permeation barrier. The Chemical Densified Coating (CDC) method has some advantage compared with another coating method. This method is capable to form densified coating on either the outer or the inner surf…
We determine the molecular first-order hyperpolarizability β of the highly nonlinear organic salt 4-N,N-dimethylamino-4′-N′-methyl stilbazolium tosylate (DAST, βzzz=(1540±250)×10-40 m4/V at λ = 1542 nm) and the cocrystal 4-{2-[1-(2-hydroxyethyl)-4-pyridylidene]-ethylidene}-cyclo-hexa-2,5-dien-1-one)–(methyl 2,4-dihydr…
Aluminosilicates frequently deposit onto plumbing materials in distribution systems. Such solids were previously believed to provide some degree of corrosion protection to pipes—although at the expense of increased head loss, reduced flow, and consumer complaints related to postprecipitation. However, this work demons…
Anisotropy is evaluated for in-plane mechanical properties, such as tensile modulus, maximum stress in tension, elongation at maximum stress, shear modulus, and bending rigidity, of three designed sets of spot-bonded nonwoven fabrics. Image analysis is used to quantify the fiber orientation distribution and identify f…
Controlled free radical polymerizations of the four isopropylidene protected styryl sugar monomers, 2,3;4,5-di-O-isopropylidene-1-(4-vinylphenyl)-D-gluco(D-manno)pentitol (1), 2,3-isopropylidene-1-(4-vinylphenyl)-D-threo(D-erythro)triol (2), 1,2;3,4-di-O-isopropylidene-1-(4-vinylphenyl)-D-glyero(L-glycero)-α-D-galacto…
Hydrogenated nitrile rubber (Therban) was introduced in the early 80's by Bayer as an oil-resistant elastomer for permanent exposure to temperatures between –25°C and 150°C. By specific modification of micro- and macrostructural features the service temperature range could be extended. The introduction of bulky side g…
Blends of phenolics with poly(ε-caprolactone) (PCL) were prepared by solution casting from the tetrahydrofuran (THF) solution. Differential scanning calorimetry (DSC) and Fourier-Transform infrared spectroscopy (FTIR) were used to examine the miscibility behavior and hydrogen bonding of the blend. This phenolics/PCL b…
The effects of elements such as Ni, Mo, Cr, Cu, and V on the wear behaviour of high manganese steels have been reported extensively. Most researchers agree on the influence of many of the elements but disagree on the effect of Cr. A study has been conducted to evaluate the effect of 1.7 and 2.3 wt-Cr on high manganese…
A numerical simulation for polymeric foaming extrusion processes was conducted. Combining classical nucleation rate and bubble growth models with a non-Newtonian fluid model of a flow, a simultaneous bubble nucleation and growth behavior in a flow field was simulated. Simulation results were compared with the experime…
A homologous series of banana-shaped compounds (n =1-12) is described. The short-chain derivatives exhibit a B6 phase, while B6/B1 dimorphism is found for the pentyloxy and hexyloxy homologues. The B1 phase of the compounds having longer alkyloxy chains is changed to a B2 phase for the compounds with n =11 and 12. The…
External pressure (uniaxial or isostatic) is usually necessary to form a thin and defect‐free joint in green state joining of SiC ceramics. A successful method of joining SiC in the green state using a liquid polymer precursor, allylhydridopolycarbosilane (AHPCS), without applied pressure, is described. The thermal de…
Abstract The nanostructure of natural aluminosilicate nanofiber “imogolite” under acidic conditions was directly confirmed by observation with atomic force microscope (AFM) for the first time. The outer surface of imogolite was successfully hydrophobidized by chemisorption of a phosphonic acid derivative with an alkyl…
Novel chemical routes to high-quality nanodispersed quantum dots of Zn 3 P 2 have been developed. The precursors Me 2 Zn and HP t Bu 2 were thermolyzed in TOPO (tri- n -phosphine oxide) or 4-ethylpyridine, resulting in capped nanomaterial. The nanoparticulates described in this work were capped with either TOPO or 4-e…