Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNew Approach to Hyperbranched Polyesters: Self-Condensing Cyclic Ester Polymerization of Bis(hydroxymethyl)-Substituted ε-CaprolactoneM. Trollsås, P. Löwenhielm, V. Y. Lee, M. Möller, R. D. Miller, and J. L. HedrickView Author Infor…
Summary The stabilization of organic matter in soil by interaction with aluminium (Al) or allophane is important in maintaining soil quality, and in retarding the decomposition of soil organic matter. Complexation of Al by soil organic matter may also ameliorate Al toxicity. Here we use 13 C‐NMR spectroscopy to assess…
A silicon light emitting device was designed and realized utilizing a standard 2-μm industrial CMOS technology design and processing procedure. The device and its associated driving circuitry were integrated in a CMOS integrated circuit and can interface with a multimode optical fiber. The device delivers 8 nW of opti…
Throughout the evolution of XPS, the ability to compensate for surface charging and accurately calibrate the binding energy scale, particularly with electrically inhomogeneous samples, has remained one of the most intractable problems. The last decade, however, has seen some quite significant advances in this area. Be…
This paper presents measurements of low-level leakage current (LC) patterns on naturally aged insulators and artificially contaminated material samples as well as insulaton. A nonlinear behaviorof the LC has been observed. Possible causes for this behavior are discussed and its relations to surface hydrophobicity and…
The two‐step electrolysis technique was developed for the purpose of preparation of a transparent and conductive zinc oxide (ZnO) film by cathodic deposition from a simple zinc nitrate aqueous solution at ambient temperature. The structural, optical, and electrical characterizations were performed with an atomic force…
The interface between flax fibres and thermoplastic polymer matrices has been investigated. Two types of flax fibres have been used: dew retted and upgraded Duralin fibres. The latter fibres have been treated by a novel treatment process for improved moisture and rot sensitivity. The apparent shear strength of dew-ret…
We report the transport and magnetic properties of a series of ferromagnetic metallic compounds, ${\mathrm{Eu}}_{1\ensuremath{-}x}{R}_{x}{\mathrm{TiO}}_{3},$ where the maximum ${T}_{C}$ is 8 K at $x=0.1.$ Magnetic interaction between Eu $4f$ spins mediated by itinerant Ti $3d$ electrons is essential for the ferromagne…
Layer-by-layer assembly of DNA film was fabricated on quartz plates through alternative adsorption with poly(allylamine) in order to investigate the interaction of DNA film with dyes. The film was water-insoluble and can interact with many water-soluble dyes. It has been found that ethidium bromide (EB) and 5,10,15,20…
The dependence of the proton spin-lattice relaxation rate, and of the enthalpy and temperature of denaturation on water content, were studied by nmr and differential scanning calorimetry (DSC) in native and denatured collagen. Collagen was first heated at four different temperatures ranging from 40 to 70 degrees C. Th…
Vicker's microhardness study of (100), (010) and (001) faces of a non-linear optical crystal, L-arginine hydrobromide monohydrate (LAHBr)have been reported.(100) plane is found to be the weakest plane. It has been observed that the microhardness decreases with increasing load for the three crystal planes. The microhar…
The paper presents a review of room temperature vulcanized (RTV) silicone rubber high voltage insulator coatings (HVIC). These coatings are designed to replace greasing and waterwashing of insulators. Present day coatings are the result of nearly thirty years of development and use. In all but a very few dirty environ…
Using nonlocal density functional theory calculations, we have examined several factors influencing ruffling deformations of porphyrin and porphyrazine complexes. Because a ruffling distortion is often a direct result of a small macrocycle core size, which, in turn, is brought about by complexation of a central ion wi…
Phthalocyanines with two and four optically active binaphthyl units have been synthesized and characterized by electronic absorption, CD, and MCD spectroscopy. The chiral substituents induce CD in the in-plane polarized Q and Soret bands of phthalocyanines: phthalocyanines having R and S binaphthyls show positive and…
Abstract Five Fe–bearing dioctahedral smectites (three nontronites and two Fe-rich smectites) were purified using a variety of physical and chemical procedures. The structural formulae indicate one nontronite and one Fe-rich smectite to be montmorillonitic, whereas the other three smectites are beidellitic. Mössbauer…
Fatigue properties of shape-memory alloys (SMA) play an important role in actuator and certain biomedical applications. Since a small cyclic stress can trigger martensitic transformation when the mean stress is close to a critical stress, it is crucial to understand the effect of mean stress. This paper examines mean…
Abstract The ammonium acetate saturation (AMAS) method was used to study the cation-exchange capacity (CEC) of zeolitic volcaniclastic materials from Santorini and Polyegos Islands, Greece. The AMAS method was tested with respect to the time required to saturate the samples of zeolites with ammonium (NH 4 + ) ions, th…
The power dependence of the transient absorption spectrum of CdSe nanoparticle colloids with size distribution of 4.0 ± 0.4 nm diameter is studied with femtosecond pump−probe techniques. At the lowest pump laser power, the absorption bleaching (negative spectrum) characteristic of the exciton spectrum is observed with…
Ethylammonium nitrate (EAN) is a liquid organic salt that has many potential applications in protein chemistry. Because this solvent has hydrophobic and ionic character as well as the ability to hydrogen bond, it is especially well suited for broad use in protein crystallography. For example, EAN may be used as an add…
Carburizing: Microstructures and Properties explains how to recognize and address problems associated with case carburizing treatments for steels. It examines the nature of internal oxidation, decarburization, free carbides, and retained austenite and their effect on fatigue and fracture strength, wear resistance, imp…