Materials Literature
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We demonstrate compaction of DNA with nanoscale biomimetic constructs which are robust synthetic analogs of globular proteins. These constructs are approximately 15 nm in diameter, shell crosslinked knedel-like (SCKs) nanoparticles, which are prepared by covalent stabilization of amphiphilic di-block co-polymer micell…
Porous silicon Fabry-Pérot optical filters with reflectivity peaks in the visible and near infrared spectral range have been manufactured electrochemically and characterized with variable angle spectroscopic ellipsometry. Generalized ellipsometry and the Bruggeman effective medium approximation were employed to study…
The DNA binding domain of H-NS protein was studied with various N-terminal deletion mutant proteins and identified by gel retardation assay and heteronuclear 2D- and 3D-NMR spectroscopies. It was shown from gel retardation assay that DNA binding affinity of the mutant proteins relative to that of native H-NS falls in…
Fluorinated ether ketone oligomers bearing a crosslinkable ethynyl group at the chain end have been investigated for low-loss polymer optical waveguide devices. These oligomers are designed to achieve low birefringence and were synthesized by the reaction of 4,4′-(hexafluoroisopropylidene)diphenol with an excess decaf…
During ion etching (IE) processes used for making a Pt electrode in the fabrication of ferroelectric capacitors, the film is exposed to radiation and energetic ion bombardment. The influence of such processes on polarization-electric field characteristics of lead zirconate titanate thin film capacitor has been reporte…
The effect of the density of states on the lifetime of low-energy electrons in metals has been studied using a golden rule approach. Simple approximations to the real density of states of metals have been used allowing analytical results, which show that the free-electron scaling $(E\ensuremath{-}{E}_{F}{)}^{\ensurema…
As previously reported, a selectively strong green emission due to the Ho3+: (5F4, 5S2)→5I8 transitions is observed in Nd3+–Ho3+ co-doped ZrF4-based fluoride glasses under 800 nm excitation. As an attempt to more enhance Ho3+ up-conversion luminescences in the Nd3+–Ho3+ co-doped ZrF4-based glasses, Yb3+ ions were adde…
A study of resonant-x-ray scattering in a charge-ordered perovskite manganese oxide ${\mathrm{Nd}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3}$ was performed. Dipole-resonant superlattice reflections originating from the orderings of the charge and orbital with ${Q}_{\mathrm{charge}}=(0,1,0)$ and ${Q}_{\mathrm{orbital}…
In the finite field (FF) treatment of vibrational polarizabilities and hyperpolarizabilities, the field-free Eckart conditions must be enforced in order to prevent molecular reorientation during geometry optimization. These conditions are implemented for the first time. Our procedure facilities identification of field…
We have investigated the charge-density distribution of an antiferromagnetic bi-layered manganite, NdSr 2 Mn 2 O 7 , by the maximum entropy method (MEM) using the synchrotron X-ray powder data. The magnetic structure below T N =150 K is known to be a layered-type (A-type). We have found a significant change of the ele…
The interfacial effect of the fluid phase on the growth morphology of crystals is very difficult to describe. This is particularly so for crystallization systems with complicated growth units. Based on newly developed morphological theories, a new approach, the so-called interfacial structure (IS) analysis is develope…
The interpretation of the published electrical transport data of the group IVB transition-metal pentatellurides, ${\mathrm{ZrTe}}_{5}$ and ${\mathrm{HfTe}}_{5},$ have been reconsidered. These materials evince a strong resistivity peak at a temperature where the Hall effect and the thermopower manifest a change in sign…
Optical transitions of radiation-induced paramagnetic Ge centers have been investigated in Ge-doped ${\mathrm{SiO}}_{2}$ samples containing a negligible amount of native oxygen coordination defects, whose optical absorption usually dominates the UV spectral range. The analysis of optical and electron paramagnetic reso…
The oxidative polymerization of aniline in aqueous acidic solution was carried out in the presence of a variety of organic compounds as potential traps for postulated intermediates. The polymerization was inhibited by hindered phenols and electron-rich alkenes, traps for cation-radicals. However, polyaniline was still…
${\mathrm{Nd}}^{3+}{:\mathrm{Y}\mathrm{V}\mathrm{O}}_{4}$ is one of the more promising laser hosts for micro and diode-pumped solid-state lasers. At room temperature, ${\mathrm{Nd}}^{3+}$ ions in this matrix exhibit strong absorption cross sections sixfold higher than in ${\mathrm{Y}}_{3}{\mathrm{Al}}_{5}{\mathrm{O}}_…
Confined acoustic phonons in InAs nanocrystals are observed in the time domain by femtosecond pump-probe spectroscopy. The size dependence of both frequency and damping time is investigated for InAs. The frequency of the discrete modes varies between 18 and 30 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ for a nanocryst…
It is known that grain boundaries (GB's) in strontium titanate $({\mathrm{SrTiO}}_{3})$ play an important and often a controlling role in determining the material's electrical properties. To understand how their electronic structures are related to the GB structures, we have examined two structure models of the \ensur…
The ring-opening polymerization of L,L-lactide has been studied in bulk using 2-ethylhexanoic acid tin (II) salt, Sn(Oct)2, as a catalyst over a wide range of temperature and monomer to Sn(Oct)2 molar ratio. Although Sn(Oct)2 was known to initiate a fast polymerization, it is reported now that some Lewis bases, partic…
The dynamics of luminescence decay is analyzed within the general scenario of randomly distributed ions with whatever multipole interaction, taking into account energy transfer and migration processes among them. By applying Padé approximants to the Allinger and Blumen expression for the excited state population, a si…
The electronic structure and properties of the layered ceramic ${\mathrm{Ti}}_{3}{\mathrm{SiC}}_{2}$ have been examined by ab initio linear combination of atomic orbital calculations. With the calculated results we predict that the electronic conductivity of ${\mathrm{Ti}}_{3}{\mathrm{SiC}}_{2}$ is metallic and anisot…