Materials Literature
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Abstract Liquid crystal templating has been used to produce metal films with nanometer‐sized pores. While successful templating procedures have been reported for metals from some groups of elements (e.g., groups 9 and 10), no such reports are available for other groups. This work investigates liquid crystal templating…
To graft polymer chains from the surface, a uniform and dense initiator layer on the silicate substrate is indispensable. The initiator monolayer can be fabricated in many ways, of which self-assembly of trichlorosilanes on silicate substrates is widely used. However, uniformity is always going to be an issue when usi…
The clay mineralogical composition of 87 topsoil (0–15 cm) samples from inland valleys (IVs) and flood plains (FPs) in seven West African countries, namely Côte d’Ivoire, Ghana, Guinea, Mali, Niger, Nigeria and Sierra Leone, was examined using X-ray diffraction analysis to gain basic information for the development of…
A self-correction process that is time- and pH-dependent results in growth of perfect superlattices from a bulk solution of hydrophilic Ag nanoparticles, despite their polydispersity, by a vapor-diffusion technique. After 12 weeks, three-dimensional rhombic superlattices are obtained (see picture).
An analytical, phenomenology-based model is proposed for thermal expansion of isotropic single-phase polycrystalline materials. Standard rules of mixing fail to predict correctly the coefficient of thermal expansion (CTE) of such materials. The model introduced in this paper explains and accurately reproduces the U-sh…
Copper phthalocyanine films have been deposited by glow-discharge-induced sublimation. The films have undergone postdeposition heat treatments in air at 250 and 290 °C for different times, ranging from 30 min to 14 h. The properties of as-deposited and heated films have been investigated by different techniques in ord…
Photoluminescent porous silicon (PSi) was produced by Pt-assisted electroless chemical etching of p(-)-Si in a 1:1:2 (v/v/v) solution of HF, methanol, and H2O2. Upon irradiation with ultraviolet light PSi produced under these conditions luminesces with a peak emission near 590 nm that is sufficiently intense to be vis…
Monte Carlo simulation has been used to investigate the effects of linear solvent molecular size on polymer chain conformation in solutions. Increasing the solvent molecular size leads to shrinkage of the polymer chains and increase of the critical overlap concentrations. The root-mean-square radius of gyration of pol…
The linear and nonlinear optical responses of the three aromatic amino acids tryptophan, tyrosine, and phenylalanine have been investigated by time-dependent density functional theory. The effect of the peptidic chain on the polarizabilities and the first hyperpolarizabilities is addressed by substituting different gr…
Abstract Most of breakdowns are caused by aging effects of high‐voltage insulation used within these components, and there is still a need of suitable tools to diagnose such systems non‐destructively and reliably in the field. Several methods have been published in the last decade for which reliable diagnostics are cl…
Three double hydrophilic block copolymers were used as crystal-growth modifiers of DL-alanine to generate amorphous precursor nanoparticles that undergo subsequent mesoscopic transformation to core-shell mesostructures and hollow tubes with quadratic cross-sections. The growth sequence can be stopped at various stages…
Enzyme I (EI) is the phosphoenolpyruvate (PEP)-protein phosphotransferase at the entry point of the PEP-dependent sugar phosphotransferase system, which catalyzes carbohydrate uptake into bacterial cells. In the first step of this pathway EI phosphorylates the heat-stable phospho carrier protein at His-15 using PEP as…
Abstract A mesogenic‐type curing agent was synthesized to introduce a mesogenic group not only into epoxy resin backbones but also into the crosslink units. In the mesogenic curing agent system, the domain size became larger, and the network arrangement in each domain existed to a greater extent than that in a system…
The present study applies the power spectral analysis technique to understand the diffusional anomaly in liquid silica, modeled using the Beest-Kramer-van Santen (BKS) potential. Molecular-dynamics simulations have been carried out to show that power spectrum of tagged particle potential energy of silica shows a regim…
Abstract The effects of molecular characteristics and processing conditions on melt‐drawing behavior of ultrahigh molecular weight polyethylene (UHMW‐PE) are discussed, based on a combination of in situ X‐ray measurement and stress–strain behavior. The sample films of metallocene‐ and Ziegler‐catalyzed UHMW‐PEs with a…
The electrothermal simulator developed in this work uses an iterative procedure that self-consistently couples a Monte Carlo electronic trajectory simulation with a fast Fourier series solution of the heat diffusion equation. Results presented in this paper are obtained from the simulation of In0.15Ga0.85As/Al0.28Ga0.…
In this letter, the radio-frequency (RF) transmission properties of single-walled carbon nanotubes (CNTs) have been characterized up to the frequency of 12 GHz in a carbon nanotube field-effect transistor (CNFET) configuration using a two-port S-parameter method for the first time. The RF characteristics of the CNTs w…
Vibrational spectra of BH(4)(-) and its isotopic analogues in a crystalline environment of alkali metals cations (K(+), Rb(+), Cs(+)) have been investigated beyond the harmonic approximation using a variational approach supported by computations of B3LYP type anharmonic force fields. From the comparison of the observe…
Metal catalyzed, CVD-grown silicon nanowires decorated by chemical assembly of closely spaced Ag nanocrystals were modified with the well-known "silver mirror" reaction and investigated as substrates for surface-enhanced Raman (SERS) and hyper-Raman (SEHRS) spectroscopy. Four chromophores were examined: Rhodamine 6G,…
Abstract The crystal unit‐cell structures and the isothermal crystallization kinetics of poly( L ‐lactide) in biodegradable poly( L ‐lactide)‐ block ‐methoxy poly(ethylene glycol) (PLLA‐ b ‐MePEG) diblock copolymers have been analyzed by wide‐angle X‐ray diffraction and differential scanning calorimetry. In particular…