Materials Literature
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The size effects of an exciton in a nano-ring are investigated theoretically by using an effective-mass Hamiltonian which can be separated in terms of the center-of-mass and relative coordinates. The binding energy and oscillator strength of the ground state are calculated for two different ring radii as a function of…
The effects of electron-electron interaction of a two-electron nanoring on the energy levels and far-infrared (FIR) spectroscopy have been investigated based on a model calculation which is performed within the exactly numerical diagonalization. It is found that the interaction changes the energy spectra dramatically,…
Polyelectrolyte brushes consisting of polystyrene−poly(acrylic acid) (PS−PAA) diblock copolymers were investigated experimentally using surface pressure isotherms and ellipsometry. The surface pressure π of the block copolymers at the air/water interface was measured as a function of the grafting density σ at various…
We investigate the influence of hard nanoparticles on the phase behavior of diblock copolymers. Using Monte Carlo simulations, we obtain phase diagrams as a function of the nanoparticle size and concentration. When the size of the nanoparticles becomes comparable to the radius of gyration of the minority (A) block, we…
The synthesis and supramolecular organization of a novel class of rod−coil type diblock oligomers will be discussed. The diblock oligomers consist of a rodlike α-helical oligopeptide segment that is conjugated to an oligo(styrene) coil. In comparison with most of the rod−coil type oligomers that have been investigated…
Interactions of nitrogen oxides (NO x ) with ( n )MnO x −(1 − n )CeO 2 binary oxides were studied to use them for sorptive NO x removal at low temperatures (≃150 °C). The formation of MnO x −CeO 2 solid solutions with the fluorite-type structure at n ≃ 0.5 was found to be quite effective in accelerating NO x sorption…
In this paper, a hierarchical optimization procedure for reaction path synthesis is presented in which the overall reaction is not necessarily desirable with respect to the thermodynamics or mechanism of reaction. According to the specified raw materials, desired product, and probable byproducts, the overall reactions…
The transformation behavior of an embedded shape memory alloy (SMA) ribbon was investigated experimentally and numerically. Single SMA ribbons (55% Ni, 45% Ti) were pre-strained to 1% and then embedded in a room-temperature-cured epoxy resin. The embedded ribbons were heated resistively to a temperature above the aust…
A numerical study on the thermomechanical behavior of aluminum matrix composite with NiTi shape memory alloy (SMA) reinforcement under uniaxial tension is performed. The simulation is based on the micromechanics model established recently by the authors. The influence of the shape and volume fraction of SMA inclusions…
The formation of ion-pair adducts between the cationic complex La(THP)3+ (THP = 1,4,7,10-tetrakis(2-hydroxypropyl)-1,4,7,10-tetraazacyclododecane) and the anionic complexes Tm(DOTA)- (DOTA = 1,4,7,10-tetraazacyclododecane-N,N',N",N"'-tetraacetate), Tm(DTPA)2- (DTPA = diethylenetriamine-N,N,N',N",N"-pentaacetate), Tm(T…
An analytical formula is developed to predict the energy dissipation in nickel-titanium (Ni-Ti) shape memory alloy (SMA) wires under cyclic bending. Such a formula is derived based on the classical beam theory together with an idealized material curve for SMAs. To demonstrate its accuracy, the formula is first applied…
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…