Materials Literature
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Contributions of acoustical deformation scattering, ion impurity scattering and grain boundary potential scattering to the conductivity of TCO films have been calculated in order to deduce the intrinsic limit of conductivity of TCO films regardless of precise details of the preparation procedure. The results indicate…
Poly(amidoamine) starburst dendrimers (SBDs) form stable supramolecular structures (complexes) with DNA and confer protection against degradation by nucleases. Such properties make SBDs excellent candidates for application in gene delivery strategies. Formation of supramolecular structures by two generations of SBDs,…
The motion of confined polymers is measured experimentally between parallel, atomically smooth solid surfaces, separated by 2 nm. In particular, the kinetics of intercalation of monodispersed polystyrene in alkylammonium modified mica-type silicates were studied using X-ray diffraction. The kinetics of the neat polyme…
The hydrolysis of isocyanic acid (HNCO) was investigated on various oxidic catalysts, including TiO 2, V 2 O 5 /TiO 2, and V 2 O 5 −WO 3 /TiO 2 . The kinetics were studied using powdered samples in a microreactor. The conversions of HNCO are high even at the high space velocities (10 6 h -1 ) and low temperatures (150…
The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known since over 40 years. This center has been traditionally identified with a distorted, positively-charged oxygen vacancy V_O+. However, no direct proof of the stability of this defect has ever been p…
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…