Materials Literature
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Abstract The effect of electron beam (EB) irradiation on the properties and compatibility of poly(ethylene 2,6‐naphthalate) (PEN)/poly(ethylene terephthalate) (PET) blends was investigated. Upon EB irradiation, PEN/PET blends underwent transesterification reactions, resulting in the formation of more random copolymers…
Abstract The spin states of microcrystalline samples of [Fe(OMTPP)L 2 ] + (L = DMAP or Py) have been examined and interpreted using Mössbauer spectroscopy, SQUID magnetometry and X‐ray crystallography. The Mössbauer spectra of [Fe(OMTPP)(DMAP) 2 ] + and [Fe(OMTPP)Py 2 ] + showed that both of these complexes maintain t…
Colloidal semiconductor nanocrystals (quantum dots, QDs), such as CdSe-ZnS core-shell, are highly luminescent and stable inorganic fluorophores that represent a promising alternative to organic dyes for a variety of biotechnological applications. They show size-tunable narrow photoluminescence spectra spanning nearly…
Coupons of fourteen different stainless steels were investigated in terms of surface chemistry and ease of cleaning. Steel surfaces were exposed to Bacillus cereus spores in static saline solution for 2 h. Surfaces were rinsed and then covered with whole milk and allowed to dry. Surfaces were then cleaned in an experi…
Abstract Summary: Poly(propylene oxide)‐amidoacids were used to intercalate montmorillonite clay to afford organoclays with an X‐ray basal spacing as wide as 81 Å. Differing from the ionic exchange between quaternary ammonium salts and the metal ions in clays, the intercalation mechanism involves a beta‐amidoacid chel…
We studied the adhesion and proliferation of human umbilical-vein endothelial cells (HUVEC) and human aortic smooth-muscle cells (HASMC) on modified polymer samples. The polymers under investigation were either PTFE (polytetrafluoroethylene) or PET [poly(ethylene terephthalate)], which are among the most frequently em…
Abstract Fourier‐transform infrared spectroscopy has been employed to investigate the adsorption and photo‐oxidation of CH 4 over powdered TiO 2 . The interaction between the CH 4 and TiO 2 surface is weak. It is found that no CH 4 molecules are adsorbed on the surface at 35 °C in a vacuum. Under UV irradiation, CH 4…
The adsorption structure and binding of phenyl isocyanide (PNC), 2,6-dimethyl phenyl isocyanide (DMPNC), and benzyl isocyanide (BZI) on gold nanoparticle surfaces have been studied by means of surface-enhanced Raman scattering (SERS). PNC, DMPNC, and BZI have been found to adsorb on gold assuming a standing geometry w…
meso-aryl expanded porphyrins, that can be regarded as real homologues of meso-tetraaryl porphyrins, were prepared by our synthetic protocol under the modified Rothemund-Lindsey conditions. This new class of molecules exhibits interesting spectral, electrochemical, and coordination properties. These promising features…
Although doped regions in semiconductors have been shown to give a different secondary electron yield in low-voltage scanning electron microscopy, the basic interpretation of this contrast has been difficult. It is accepted that this contrast stem from electronic phenomenon rather than atomic number differences betwee…
Abstract The aerobic aqueous solution syntheses and structures of monomeric and polymeric Mn II complexes containing the oxydiacetate ligand [O(CH 2 COO) 2 2− = oda] are reported. The magnetic properties of the polymeric products have also been investigated. The initially obtained species [{Mn(oda)(H 2 O)}·H 2 O] n (…
Measurements are reported of the spectroscopic properties of phosphate glasses doped with 3-, 5-, and 10-wt. % Nd3+ in the temperature range 70–300 K. The stimulated-emission cross sections of these glasses were determined by use of the Füchtbauer–Ladenburg formula at each temperature. The absorption spectra at room t…
Abstract The electronic absorption and magnetic circular dichroism (MCD) spectra, and differential pulse (DP) voltammograms of planar heterodinuclear phthalocyanine (Pc) dimers consisting of Pc and pyrazinoporphyrazine (PyZ), [Mt 2 PcPyZ (Mt = H 2 and Zn)] and of Pc and naphthalocyanine (Nc), [Mt 2 PcNc (Mt = H 2 and…
Abstract We investigated the crystallization and orientation development in melt spinning and tubular blown film extrusion of several different types of polypropylenes, including conventional high tacticity isotactic polypropylenes (iPP) and metallocene catalyst low tacticity iPPs and syndiotactic polypropylenes (sPP)…
The recently developed fast Fourier factorization method, which has greatly improved the application range of the differential theory of gratings, suffers from numerical instability when applied to metallic gratings with very low losses. This occurs when the real part of the refractive index is small, in particular, s…
Abstract We have studied the effect of subsequent gamma (γ) irradiation on the absorption spectra and the optical energy gap of ZnO thin films doped with Li (ZnO:Li). The optical transmission (T) and optical reflection (R) in the wavelength range 190∼800 nm of films deposited at 300 °C on sapphire, MgO or quartz subst…
During hot dip galvanising, the metal strip passes into the zinc bath at a temperature of ~460°C. Iron from the strip dissolves into the bath during this operation, leading to problems such as dross formation and pickup. The model described in the present paper has been created in an attempt to quantify and understand…
Maleevite, ideally Ba B2 Si2 O8, and pekovite, ideally Sr B2 Si2 O8, are two new mineral species found in boulders in the moraine of the Dara-i-Pioz glacier, the Alai range, Tien Shan, Garmskii district, northern Tajikistan. Both minerals occur as anhedral equant crystals from 0.5 to 2 mm in diameter. Crystals of both…
Abstract Summary: The well‐controlled reduction of polyketone carbonyl functional group was performed without chain degradation by using NaBH 4 in tetrahydrofuran (THF)/MeOH solvent mixtures. Three different families of flexible polyketones (alternating propene/CO “PCO”, hex‐1‐ene/CO “HxCO” copolymers, and “pulse feed…
In order to develop durable linen-like cotton yam with low temperature mercerization, pretreatment methods ensuring efficient and uniform penetration of the low temperature alkali solution into cotton yarn are studied. Pretreatments consisting of an alkaline scouring at higher NaOH concentrations and of a cellulase tr…