Materials Literature
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The wavelength corresponding to the extinction maximum, λ max, of the localized surface plasmon resonance (LSPR) of silver nanoparticle arrays fabricated by nanosphere lithography (NSL) can be systematically tuned from ∼400 nm to 6000 nm. Such spectral manipulation was achieved by using (1) precise lithographic contro…
Reactive Ion Etching is an effective method for etching of diamond films, in this paper, the influences of maskant, system pressure and the composition of reactive gas on the etch rate and etched surface of diamond were studied. A gas mixture of O<SUB>2</SUB> and Ar was used as the reactive agent, the concentration of…
Many bacteria have been found to synthesize a family of polyesters termed polyhydroxyalkanoate, abbreviated asPHA. Some interesting physical properties of PHAs such as piezoelectricity, non-linear optical activity, biocompatibility andbiodegradability offer promising applications in areas such as degradable packaging,…
Corrosion fatigue tests were performed in air saturated hot water to assess fatigue crack growth behavior of reactor pressure vessel steel at the LWR operating condition. The main test parameter was loading frequency. Crack growth rate was increased with decreasing frequency until a critical frequency. It was found th…
The gamma-subunit of citrate lyase (EC 4.1.3.6) contains the prosthetic group 2'-(5"-phosphoribosyl)-3'-dephospho-CoA and serves as an acyl carrier protein (ACP). We recently showed that in Escherichia coli the proteins CitG and CitX are essential for holo-ACP synthesis and provided evidence that CitG catalyzes the fo…
When electrons are subject to a potential with two incommensurate periods, translational invariance is lost, and no periodic band structure is expected. However, model calculations based on nearly free one-dimensional electrons and experimental results from high-resolution photoemission spectroscopy on a quasi-one-dim…
We present results from a Monte Carlo investigation of a simple bilayer model with geometrically frustrated interactions similar to those found in the mixed layer pnictide oxides $(Sr_{2}Mn_{3}Pn_{2}O_{2}, Pn=As,Sb).$ Our model is composed of two inequivalent square lattices with nearest neighbor intra- and interlayer…
We describe a lattice Boltzmann algorithm to simulate liquid crystal hydrodynamics. The equations of motion are written in terms of a tensor order parameter. This allows both the isotropic and the nematic phases to be considered. Backflow effects and the hydrodynamics of topological defects are naturally included in t…
We propose a cellular version of dynamical-mean field theory which gives a natural generalization of its original single-site construction and is formulated in different sets of variables. We show how non-orthogonality of the tight-binding basis sets enters the problem and prove that the resulting equations lead to ma…
In the course of the rapid development of laser technology and modern optics, an ever increasing demand for optical coatings with extraordinary specifications can be observed. In practice, the production of such high quality optics with special requirements in respect to bandwidth, edge steepness or wavelength accurac…
The viscosity and electrical conductivity of aqueous solutions of trehalose and other saccharides containing 1:1 electrolytes have been measured. The decrease in the molar conductivity of each of these electrolytes with increasing viscosity is less than that predicted by Walden's rule. Instead, the empirical relation…
The photophysical properties of Mo 3+ -doped chloro- and bromo-elpasolites at 10 K and as a function of temperature are presented. Visible upconverted luminescence is observed with near-infrared laser excitation, and the properties of this two-photon excitation process are experimentally characterized by a variety of…
In this paper, we report observations on single internally mixed ammonium sulfate/calcium carbonate microparticles. Deliquescence and efflorescence relative humidities for this mixed system are reported. The slightly soluble CaCO 3 has a negligible effect on the deliquescence relative humidity and the concentration-de…
The highly ordered mesoporous material H I SiO 2 was prepared at room temperature and low pH utilizing a high concentration of nonionic surfactant to achieve a hexagonal ordered phase with a pore size of ∼3.5 nm. The grafted amino ligand was covalently bonded to the internal pore surface of H I SiO 2 through a silanat…
Several workers have established that the Larkin domains for two three dimensional nonmetallic elastic solids in contact with each other at a disordered interface are enormously large. This implies that there should be negligible static friction per unit area in the macroscopic solid limit. The present work argues tha…
An upper bound to the roughening temperature of a close-packed singular surface, fcc Al (111), is obtained via free energy calculations based on thermodynamic integration using the embedded-atom interaction model. Roughening of Al (111) is predicted to occur at around 890 K, well below bulk melting (933 K), and it sho…
Numerical calculations of the temperature dependence of the longitudinal (T1-1) and transverse (T2-1) nuclear spin-relaxation rates for Fe, Co and Ni are performed for both ferromagnetic and paramagnetic states, using the first-principles density of states and various approximations of the spin-fluctuation theory. If…
Raman experiments were performed on Rb 2 WO 4 crystals, between room temperature and 850 K, including the high-temperature incommensurate phase. The experimental results observed in the incommensurate ( T I = 746 K) and the lock-in ( T C = 660 K) phase transitions can be explained by an order-disorder apex model, wher…
Intramolecular photoinduced electron transfer (ET) with rates greater than 2 × 10 9 s - 1 has been observed in polar solvents for the U-shaped, syn,syn isomer ( syn,syn - 4 ) of a giant tetrad with porphyrin and methyl viologen termini ( 4) . In contrast, no ET is observed in a sample containing the extended isomers a…
The properties of soft magnetic exchange-springs in both bilayer and multilayer samples are investigated, with particular emphasis on the discrete nature of the spring. It is shown that, in a mean-field model, a very simple relationship exists between the bending field B B , the exchange field B EX , and the number of…