Materials Literature
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In actuator technology active or smart materials have opened up new horizons in terms of actuation simplicity, compactness, and miniaturization potential. One such material is the nickel-titanium shape memory alloy (NiTi SMA), which is gaining widespread use in a variety of applications. The numerous advantages of SMA…
Abstract A functionalized polyphosphazene, poly[ bis (carboxylatophenoxy)‐phosphazene], was blended with a structural polyurethane via reactive mixing of the polymer with diisocyante and diol prepolymers. The thermal stabilites of the resultant foams were analyzed by thermogravimetric analysis (TGA). The char yields a…
We analyze the properties of a Lennard-Jones system at the level of the potential energy landscape. After an exhaustive investigation of the topological features of the landscape of the systems, obtained by studying small size samples, we describe the dynamics of the systems in multidimensional configurational space b…
Case studies from three Wisconsin utilities found that polyphosphate blends used for corrosion control led to increased metal concentrations in the water. When polyphosphate blends are added to water systems under certain conditions, leaching of pipe metal into the water may be significantly increased rather than decr…
Force/displacement actuators with the high output power and time response can be fabricated from shape memory wires or ribbons. Typically Ni-Ti shape memory alloys are used as an active material in such actuators. They are driven by Joule heating and air convection cooling. In the present work, the time response of va…
The analysis of the equilibrium structure of a dendrimer of fourth generation by small-angle neutron scattering (SANS) is described. The analysis presented here is based on measurements of the SANS intensities at different contrasts ρ–ρm with ρ being the average scattering length density of the dissolved dendrimer and…
We investigate the role played by conservative forces in dissipative particle dynamics (DPD) simulation of single-component and binary fluids. We employ equations from kinetic theory for matching the coefficients of DPD interparticle force to the macroscopic properties of fluid such as: density, temperature, diffusion…
Three novel Zn(hfa) 2 ·2H 2 O·polyether adducts have been prepared through simple procedures with stoichiometric quantities of zinc hydroxide, Hhfa, and polyether. The products have been characterized by elemental analysis, X-ray single-crystal analysis, fast atom bombardment mass spectra, 1 H and 19 F NMR spectra, th…
Visible light-induced IR absorption in colloidal CdSe quantum dots is observed by step-scan FTIR spectroscopy. Size dependence and the effect of surface modification are investigated. The introduction of surface hole trap states enhances and prolongs the IR absorption in photoexcited quantum dots. Our measurements rev…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTStructure of Polymer Brushes under Shear Flow in a Good SolventS. M. Baker, G. S. Smith, D. L. Anastassopoulos, C. Toprakcioglu, A. A. Vradis, and D. G. BucknallView Author Information Harvey Mudd College, Claremont, California 9171…
The chemical diffusivity of undoped ${\mathrm{BaTiO}}_{3\ensuremath{-}\ensuremath{\delta}}$ which was measured in Song and Yoo [Solid St. Ionics 120, 141 (1999)] is analyzed on the basis of the defect structure proposed and Wagner's classic theory of chemical diffusion. It is confirmed that a maximum of isothermal che…
MarqX is a computer program for the modelling of powder diffraction data. It can be used for an unconstrained profile fitting (pattern decomposition, PD) or constrained modelling of the whole powder pattern (Pawley method, PM), for single- as well as multiple-phase samples. The program output includes: lattice paramet…
We present the electrical properties of polycrystalline samples Pr1—xSrxMnO3 (0 ≤ x ≤ 0.5). These properties are correlated to the ratio of the Mn3+/Mn4+ cations. The transport properties of the Pr1—xSrxMnO3 samples could be explained on the basis of double exchange mechanism between pairs of Mn3+ and Mn4+ cations, wi…
SrRuO 3 thin films were prepared on (100) LaAlO 3 substrates by metalorganic chemical vapor deposition (MOCVD) at various deposition temperatures from 550°C to 750°C. The composition of the film can be controlled by monitoring the composition of the input source gas. Below 600°C, the degree of a -axis orientation of t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Hyperbranched Aromatic Polyimides via Polyamic Acid Methyl Ester PrecursorKazuhiro Yamanaka, Mitsutoshi Jikei, and Masa-aki KakimotoView Author Information Department of Organic and Polymeric Materials, Tokyo Institute…
Abstract In this work, experimental and theoretical studies of the free‐radical initiated molecular weight degradation of polypropylene in a modular self‐wiping corotating twin screw extruder have been investigated. Our objective was to build a model that would be able to predict the evolution of the average molecular…
A novel machine has been developed to measure transport coefficients in the temperature range of 50–350 K of thin films deposited on electrically insulating substrates. The measured coefficients—resistivity, Hall, Seebeck, and Nernst—are applied to solutions of the Boltzmann transport equation to give information abou…
Corrosion inhibition of steel in phosphoric acid (H3PO4) by thiosemicarbazide derivatives was studied using different chemical and electrochemical techniques. Protection efficiency up to 99% was obtained with small amounts (10−4 M) of cinnamaldehyde thiosemicarbazone (CTSCN). The order of increasing inhibition efficie…
Abstract Sorptive properties of organoclays may be greatly influenced by the physicochemical properties of organic sorbates. Hexadecyltrimethylammonium(HDTMA) clays were prepared using a high-charge smectite (HDTMA-SAz-1), a low-charge smectite (HDTMA-SWy-2), and an illite (HDTMA-ILL). The resultant organoclays were u…
The effects on microbiologically induced corrosion (MIC) of carbon steel resulting from the presence of corrosion products in the biofilm of sulphate reducing bacteria (SRB) have been investigated. The SRB were isolated from the Changqing oilfield in China. Electrochemical impedance spectrometry and a hydrogen monitor…