Materials Literature
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We examine the crystallization behavior of polyethylene- b -poly(vinylcyclohexane) diblock copolymers, E/VCH, using a combination of transmission electron microscopy (TEM), dilatometry, and time-resolved small-angle X-ray scattering (SAXS). The glassy VCH matrix effectively restricts E crystallization to within the sp…
Barrier properties of a nanocomposite comprised of perfectly aligned randomly dispersed platelets are described in this communication. The finite-element based methodology employed is generic and can readily be used to identify the role of various morphological imperfections typical of nanocomposites. The Figure shows…
Shape memory alloys offer attractive potentials such as: superelastic behaviour, reversible strains of several percent during heating or cooling over a limited temperature range, generation of high recovery stresses, and a work output with a high power/weight ratio. This paper describes the origin of those properties…
Recently [Opt. Lett. 25, 1092 (2000)], two of the present authors proposed extending the domain of applicability of grating theories to aperiodic structures, especially the diffraction structures that are encountered in integrated optics. This extension was achieved by introduction of virtual periodicity and incorpora…
The gas-phase studies of transition metal hydrides and their coordination chemistry was presented. The synthesis of the hydrides by addition, metathesis and decomposition and elimination reactions, and the characterization of their physical, thermodynamic and vibrational properties was discussed. The studies also incl…
Polystyrene−clay and polystyrene−graphite nanocomposites have been prepared and used to explore the process by which the presence of clay or graphite in a nanocomposite enhances the thermal stability of polymers. This study has been designed to determine if the presence of paramagnetic iron in the matrix can result in…
Materials capable of field conversion, from magnetic to electric or vice versa, are of fundamental and technological importance. We report a giant magnetoelectric (ME) effect that results from stress-mediated electromagnetic coupling in bilayers and multilayers of nickel ferrite and lead zirconate titanate. Samples wi…
The current state of polaron theory as applicable to transition metal oxides is reviewed, including problems such as impurity conduction where disorder plays a role. An estimate is given of the conditions under which polaron formation leads to an enhancement of the mass but no hopping energy. The binding energy of a p…
Potassium (K) fixation in Argentine soils and its effects on fertilizer K dose effectiveness remains an under-researched topic. The effects of K addition doses and clay type and content on the K fixation/release dynamics of added K in four soils, two Argiudols, an Ultisol and an Andisol were studied. Fixation responde…
A binary hydrophilic interpenetrating polymer network (IPN) comprising of polyethylene glycol (PEG) and poly(2-hydroxyethyl methacrylate) (PHEMA) was prepared and the adsorption of bovine serum albumin (BSA) was carried out onto the surfaces of the IPNs. The adsorbed amounts of BSA were investigated as a function of t…
Abstract The ultrasonic devulcanization of sulfur‐cured natural rubber (NR)/styrene–butadiene rubber (SBR) blends was studied with the goal of understanding the devulcanization of rubber vulcanizates in which two networks of different natures were present. Also, similarities and differences in the devulcanization beha…
A number of implants of cardiac valve prosthesis, vascular prosthesis, and coronary stents present a pyrolytic carbon interface to blood. Plasma protein adsorption is essential for the hemocompatibility of the implanted devices. This work quantitatively evaluates the molecular interaction force between a biomaterial s…
In our work, 25 mol % of Y 3+ -doped BaCeO 3 (BCY25) showed an extremely low activation energy of 0.3 eV for proton conduction at the surface. The resulting overall conductivity at the surface reached 8.24 × 10 -3 S cm -1 at 400 °C, which was 3, 8, and 28 times higher than conductivities in the bulk of BCY25, 20 mol %…
A variety of biphenylthienyl and terphenyl-based liquid crystalline materials were prepared that incorporate a 1,1-difluoropentyl terminal group. The mesogenic properties of these compounds were compared and contrasted with analogs where the CF2 moiety was replaced by a -CH2-, -O- or -CO- group. The 1,1-difluoroalkyl…
Metallophthalocyanine complexes are obtained quickly and efficiently by the reaction of phthalodinitrile with hydrated metallic salts without solvent and under microwave irradiation. The use of a modified commercial microwave oven to perform this type of reactions under dry conditions is described. Metallophthalocyani…
Spin unrestricted DFT calculations on Cr3(dpa)4Cl2 (dpa = dipyridylamide) suggest that the linear (Cr3)6+ metal framework could adopt either a symmetric conformation, or a strongly nonsymmetric one, depending on the nature of the spin coupling between the localized metal electrons.
Complexes [FeIII2MIIOL3] (M = Fe, Co, Ni, Cu; 2, 3, 4, 5) have been synthesised in which L2− is a pentadentate ligand designed to coordinate all three metal atoms in the central cluster and to inhibit dissociation and solvent exchange processes. Crystal structures for 2, 4 and 5 show threefold symmetry, attributed to…
The 10th International Conference on ferroelectricty was held on 3 – 7 September, 2001 in Madrid, Spain. At a plenary session of the conference, a talk was delivered, whose content is presented in the present paper. The paper is primarily concerned with the work of V L Ginzburg and other Russian physicists on the theo…
Abstract The preparation and characterization of ferrite‐ and carbon black‐filled ethylene‐propylene‐ethylidene norborene terpolymer rubber composites were studied for microwave applications. Both the insertion loss and return loss were measured in a high‐frequency range (X‐band) with a network analyzer. The results i…
The review concerns the main chemical and physicochemical properties and the methods of modification of carbon nanotubes, a novel promising material. The feasible and potential fields of applications of carbon nanotubes are outlined. The bibliography includes 573 references.