Materials Literature
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Several biaxial (tension (or compression)-torsion) proportional and non-proportional loading experiments are performed by Jesse Lim and McDowell (in 1998) for thin-wall tubes of a Ni-Ti shape memory alloy (SMA). In addition to the mechanical behavior, temperature was measured with thermocouples during the experiments,…
Pentavalent organo-vanadates have been put forth as transition state analogues for a variety of phosphoryl transfer reactions. In particular, uridine 2',3'-cyclic vanadate (U>v) has been proposed to resemble the transition state during catalysis by ribonuclease A (RNase A). Here, this hypothesis is tested. Lys41 of RN…
A combined approach based on X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and anomalous wide-angle X-ray scattering (AWAXS) has been used to obtain information on the cation distribution, the electronic state of the metal atoms, and the size of metal oxide clust…
New enaminoketone tetradentate bi- and trinuclear complexes creating columnar mesophases are reported. Various combinations of nickel, copper, or vanadyl ions were applied as metallic centers. Because of the bowlike structure of chelating centers and the low molecular symmetry (Cs) the bivanadyl complexes form two dia…
Two variant selection criteria are often used in shape memory alloys (SMAs). One is the maximum resolved shear stress (RSS) criterion and the other is the maximum transformation work criterion. In this paper these two measures are calculated using the crystallographic theory of martensite (CTM) for the shape memory ef…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSecond Harmonic Generation Properties of Fluorescent Polymer-Encapsulated Gold NanoparticlesHeather A. Clark, Paul J. Campagnola, Joseph P. Wuskell, Aaron Lewis, and Leslie M. LoewView Author Information Center for Biomedical Imaging Technology and Department of Physio…
A parametric study was performed on NiTiCu shape memory alloy torque tubes. Four samples with varying wall thickness values were evaluated for their thermo-mechanical response. The torque against the angular displacement was measured for each sample when purely martensitic and purely austenitic. The recovery torque wa…
The reactivity of NO x sorbed onto MnO x −CeO 2 toward H 2 was studied in the presence of impregnated Pd catalyst by use of TPR, H 2 pulse reactions, in situ FT-IR, and steady-state NO−H 2 −O 2 reactions. The Pd-loaded catalyst after saturated NO x -sorption at 150 °C could be regenerated by micropulse injections of H…
Copper(II) benzoate dimers and linear chains have been synthesized and exhibit very different magnetic behaviors. The benzoate dimers, 1a, show typical dimeric singlet-triplet transitions and strong antiferromagnetic coupling (JST = -206 K (-143 cm-1); H = -2JSTSa.Sb). The bromobenzoate dimer can be converted into lin…
X-ray scattering investigations of surfaces and interfaces in soft-condensed matter are reviewed. Both high-resolution structural determinations in the direct space and investigations of fluctuations with long-range correlations requiring a high resolution in the Fourier space are discussed. All the scattering cross-s…
TiNi alloy is a well known shape memory alloy and has been widely used for bio-medical, mechanical and electrical applications. Recent research has demonstrated that TiNi alloy exhibits high resistance to wear and can be a superior tribo-material. Performance of this alloy benefits from its pseudoelasticity, resulting…
The thermal and electrical properties of shape memory alloys (SMA) are known to be different in their austenitic and martensitic phases. This paper addresses the determination of the phase-dependent heat capacity, thermal conductivity and electrical resistivity of a SMA wire. While the heat capacity measurements are r…
This paper presents the design and the experimental result of the active position control of a shape memory alloy (SMA) wire actuated composite beam. The composite beam has a honeycomb structure with SMA wires embedded in one of its face sheets for the active actuation. The potential applications of this experiment in…
The development of a biomimetic active hydrofoil that utilizes shape memory alloy (SMA) actuator technology is presented. This work is the first stage prototype of a vehicle that will consist of many actuated body segments. The current work describes the design, modeling and testing of a single-segment demonstration S…
A novel narrowly distributed rod−coil diblock copolymer, poly(styrene- block -(2,5-bis[4-methoxyphenyl]oxycarbonyl)styrene) (PS- b -PMPCS), was synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) mediated living free radical polymerization. The rodlike PMPCS block is a mesogen-jacked liquid crystalline polymer…
The focus of this study is the thermomechanical characterization and comparison between two different shape memory alloys (SMAs) quantifying the effect of plastic strain on the transformation characteristics of SMA actuators. In this study, the thermomechanical response and transformation characteristics of a NiTiCu a…
Co islands grown on Cu(111) with a stacking fault at the interface present a conductance in the empty electronic states larger than the Co islands that follow the stacking sequence of the Cu substrate. Electrons can be more easily injected into these faulted interfaces, providing a way to enhance transmission in futur…
We study a 1-D granular gas of point-like particles not subject to gravity between two walls at temperatures T_left and T_right. The system exhibits two distinct regimes, depending on the normalized temperature difference Delta = (T_right - T_left)/(T_right + T_left): one completely fluidized and one in which a cluste…
The Hohenberg-Kohn theorem of density functional theory (DFT) for the case of electrons interacting with an external magnetic field (that couples to spin only) is examined in more detail than previously. A unexpected generalization is obtained: in certain cases (which include half metallic ferromagnets and magnetic in…
We report scanning tunneling microscopy observations, which imply that all atoms in a close-packed copper surface move frequently, even at room temperature. Using a low density of embedded indium `tracer' atoms, we visualize the diffusive motion of surface atoms. Surprisingly, the indium atoms seem to make concerted,…