Materials Literature
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The influence of common cationic surfactants on the physical properties of differently composed polyelectrolyte films prepared by the layer-by-layer (LbL) technology was investigated. Free-standing polyelectrolyte films as microcapsules showed a fast, strong response to the addition of less than 1 mM cationic surfacta…
Historically, lithographic scaling has been driven by both improvements in wavelength and numerical aperture. In the semiconductor industry, the transition to 1.35NA immersion lithography has recently been completed, and the focus is now on double patterning techniques (DPT) as a means to circumvent the limitations of…
Releasing hydrogen: Aminophosphine complexes of rhodium are excellent systems for the hydrolysis of H3NBH3. The release of H2 in THF/H2O mixtures generates NH3 and B(OH)3 and is based on the sequential catalytic dehydrogenation of H3NBH3−n(OH)n and hydrolysis of H2NBH2−n(OH)n (n=0–2, see scheme).
Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes grown by surface-initiated polymerization from a polyanionic macroinitiator adsorbed at the sapphire-water interface have been used as a substrate to study the interaction between the weak polyelectrolyte PDMAEMA and the oppositely charged surfactant sodium d…
Molecular replacement is one of the key methods used to solve the problem of determining the phases of structure factors in protein structure solution from X-ray image diffraction data. Its success rate has been steadily improving with the development of improved software methods and the increasing number of structure…
The static and dynamic characteristics of top-gated graphene nanoribbon-based field-effect transistors were investigated. Multilayer graphene was synthesized by thermal decomposition of Si-face silicon carbide. The impact of the number of graphene layers on device performance was explored. It was found that, with the…
In this paper we report the synthesis of monoclinic Na 2 Ti 6 O 13 whiskers and their transformation to lead‐free 0.93Na 1/2 Bi 1/2 TiO 3 –0.07BaTiO 3 (NBTBT) ceramics. Synthesis of Na 2 Ti 6 O 13 templates was performed using molten salt synthesis method. These whiskers were further characterized using XRD, SEM, TEM,…
Macromolecular crystallography relies on the availability and quality of single crystals; these are typically obtained through extensive screening, which has a very low intrinsic success rate. Crystallization is not a completely stochastic process and many proteins do not succumb to crystallization because of specific…
The CaO–P 2 O 5 binary system has been thermodynamically assessed using the CALculation of PHAse Diagram technique. A two‐sublattice model, (Ca 2+ ) P (O 2− , PO 3 − , PO 4 3− , PO 7/2 2− , PO 5/2 ) Q , is proposed to describe the liquid phase in the system. The selection of the species constituting the liquid phase h…
The ferrite cores of transformers and inductors are commonly excited under dc bias conditions in power electronic circuitry. Results have previously been presented showing core losses increase significantly with dc bias, along with various explanations for the cause. This paper presents measurements showing a strong c…
We have investigated electron dynamics in top gated graphene by measuring the gate admittance of a diffusive graphene capacitor in a broad frequency range as a function of carrier density. The density of states, conductivity, and diffusion constant are deduced from the low-frequency gate capacitance, its charging time…
Surfactant-free gelatin/heptamolybdate (HM) hybrid nanoparticles are prepared by a simple and environmentally friendly approach utilizing the electrostatic interaction between anionic HM and the zwitterionic gelatin. The obtained nanoparticles have a tunable size and very high HM loading content up to about 70%. In vi…
One dimensional photonic crystals combining positive and negative index layers have shown to present a photonic band gap insensitive to the period scaling when the volume average index vanishes. Defect modes lying in this zero-n gap can in addition be obtained without locally breaking the symmetry of the crystal latti…
This study focuses on understanding the basic kinetic parameters associated with runaway reactions for tert -butyl peroxybenzoate (TBPB), which is a strong free-radical source. TBPB is used as a polymerization initiator, catalyst, vulcanizing agent, cross-linking agent, and chemical intermediate. Runaway reactions can…
Abstract Growing interest in novel materials for biomedical applications has promoted the investigation of composite materials that involve metal ions or metallic nanoparticles embedded in an organic polymeric matrix. The aim of the current work was the development of metal containing thin organic films, the material…
Grating cloaks are a variation of dielectric carpet (or ground-plane) cloaks. The latter were introduced by Li and Pendry. In contrast to the numerical work involved in the quasi-conformal carpet cloak, the refractive-index profile of a conformal grating cloak follows a closed and exact analytical form. We have previo…
A simple and universal pathway to produce free multilayer synthetic nanoparticles is developed based on lithography, vapor phase deposition and a tri-layer resist lift-off and release process. The fabrication method presented in this work is ideal for production of a broad range of nanoparticles, either free in soluti…
Step it up: The Na2LnMnO(AsO4)2 series contains Ln-capped [MnO4]∞ ferromagnetic chains, and the species with Ln=Gd reveals intriguing magnetic anomalies thought to be attributed to better structural confinement of the magnetic chains. It exhibits stepped magnetization and multiple-spin dynamics (see picture; Mn blue,…
Abstract A method to manufacture composites ZrCSiC p using a polymer‐derived ceramic route for SiC is reported. The key point of this approach was the use of SiC precursor polymers synthesized from a vinylsilane monomer, to enhance organic–inorganic interactions between ZrC mineral phase and the polymer. The results…
Abstract In this paper, we present electrochemical etching conditions to obtain thick mesoporous silicon electrical insulating layers for RF applications from high resistivity substrates (30–50 Ω cm). We present the realization and the characterization of spiral inductors on thick mesoporous silicon layers. Indeed, PS…