Materials Literature
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The adiabatic temperature changes (ΔTad) in the vicinity of the Curie and martensitic transition temperatures of Ni50Mn35In15 and Ni50Mn35In14Z (Z=Al and Ge) Heusler alloys have been studied using an adiabatic magnetocalorimeter of 250–350 K temperature interval for applied magnetic field changes up to ΔH=1.8 T. The l…
Abstract Star‐shaped amphiphilic poly(ε‐caprolactone)‐ block ‐poly(oligo(ethylene glycol) methyl ether methacrylate) with porphyrin core (SPPCL‐ b ‐POEGMA) was synthesized by combination of ring‐opening polymerization (ROP) and atom transfer radical polymerization (ATRP). Star‐shaped PCL with porphyrin core (SPPCL) wa…
Photo-cross-linkable polyelectrolyte multilayers were made from poly(allylamine) (PAH) and poly(acrylic acid) (PAA) modified with a photosensitive benzophenone. Nanoindentation, using atomic force microscopy (AFM) of these and unmodified PAH/PAA multilayers, was used to assess their mechanical properties in situ under…
Metallo-dielectric photonic crystals (MDPCs) are used as ultrasensitive molecular detectors for concentrations down to picomolar level based on surface-enhanced Raman spectroscopy (SERS). Calculations show that the amorphous silicon photonic crystals (a-Si PCs) embedded in multiple metallo-dielectric (MD) units can si…
This work analyzes the ability of split-ring metamaterial slabs with zero/high permeability to reject/confine the radiofrequency magnetic field in magnetic resonance imaging systems. Split-ring slabs are designed and fabricated to work in a 1.5 T system. Nonlinear elements consisting of pairs of crossed diodes are ins…
Resistivity (ρ), Seebeck coefficient (α) and thermal diffusivity of the title compounds CaZn 2 P 2 , YbZn 2 P 2 , YbCuZnP 2 and YbMnCuP 2 are measured over a temperature range 300–1000 K to evaluate the thermoelectric potential of these materials. The temperature dependence of ρ and α of these light weight and less ex…
We report the homoepitaxial growth by molecular beam epitaxy of high quality nonpolar m-plane ZnO and ZnO:N films over a large temperature range. The nonintentionally doped ZnO layers exhibit a residual doping as low as ∼1014 cm−3. Despite an effective incorporation of nitrogen, p-type doping was not achieved, ZnO:N f…
The silk transfer applied micropatterning (STAMP) method enables patterning of large area silk fibroin protein films with metallic microfabricated features. All processing is performed under ambient conditions in an aqueous environment. The micropatterns fabricated enable masking of biopolymer films for dry etching to…
A convenient method for passivating and functionalizing stainless steel is described. Several methods of coating stainless steel (SS) samples with silica were investigated and of these methods, a thin (less than 15 nm thick) layer of silica created by atomic layer deposition (ALD) was found to give superior performanc…
pH-responsive drug delivery systems have attracted great interest because of their potential use in antitumor therapies. Herein, we report a facile one-pot fabrication of a “host−metal−drug” coordination-bonding system in a mesostructured surfactant/silica hybrid for the pH-responsive drug delivery purpose. The mesost…
The optical properties and charge trapping phenomena observed on oxide nanocrystal ensembles can be strongly influenced by the presence of nanocrystal interfaces. MgO powders represent a convenient system to study these effects due to the well-defined shape and controllable size distributions of MgO nanocrystals. The…
Here, we show that nanostructured magnesium‐aluminate spinel (MgAl 2 O 4 ) with a highly uniform grain‐size distribution can be fabricated using Y 2 O 3 sintering additive for infrared (IR) window/dome applications. The average grain size of this nanostructured spinel is 345 nm, and the size of the largest grain is 97…
A new class of high-temperature iron-based superconductors lacks features in its electronic band structure that, based on current theoretical understanding, were considered essential. In a field that has produced quite a few surprises, this is the biggest yet.
We report on the synthesis and characterization of water-dispersible, mechanically stable conjugated polymer nanoparticles (CPNs) in shelled architecture with tunable emission and controllable photometric properties via cross-linking. Using a reprecipitation method, white-emitting polymer nanoparticles are prepared in…
In this work, we report the design, fabrication, and characterization of gold nanocrosses for chemosensing purposes. The nanocrosses are designed to exhibit a localized surface plasmon resonance which is very sensitive to refractive index changes in the surrounding medium, resulting in sensitivity values of around 500…
Abstract Three series of terephthalate polyesters (copolyesters and terpolyesters) containing 70, 80, and 90 mol % of ethylene glycol respectively, 1,4‐cyclohexanedimethanol (CHDM) and isosorbide in varying ratios, were synthesized by melt polycondensation. It was found that only ∼75 mol % of the feeding isosorbide wa…
Graphene nanoribbons (GNRs) are fabricated by dip-pen nanolithography and polystyrene etching techniques on a SrTiO(3)/Nb-doped SrTiO(3) substrate. A GNR field-effect transistor (FET) shows bipolar FET behavior with a high mobility and low operation voltage at room temperature because of the atomically flat surface an…
Abstract Thermoplastic foaming within a mold cavity was visualized as it was conducted in an 85‐ton core‐back injection‐molding machine. The core‐back molding process moved a section of the mold just after injecting a molten polymer into the cavity, quickly reducing the pressure to enhance the bubble nucleation. The f…
Detailed morphological and structural characterization of high-aspect-ratio polyaniline nanofibers obtained using a small amount of p -aminodiphenylamine (dimer) or p -phenylenediamine (diamine monomer) as an initiator into a rapidly mixed reaction is presented. Structural characteristics have been investigated by FT-…
The effects of various transition-metal dopants on the electrical and thermal transport properties of Fe${}_{1\ensuremath{-}x}$$M$${}_{x}$Si alloys ($M$ $=$ Co, Ir, Os) are reported. The maximum thermoelectric figure of merit $Z$${T}_{\mathrm{max}}$ is improved from 0.007 at 60 K for pure FeSi to $\mathit{ZT}$ $=$ 0.0…