Materials Literature
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Abstract The influence of physical aging on the electret properties before corona charging of three amorphous polymers, polyetherimide (PEI), poly(phenylene ether) (PPE), and polystyrene (PS), as well as with blends of PPE and PS, was investigated. The degree of aging was monitored by determining the enthalpy relaxati…
Abstract This study is an attempt to investigate the effect of a representative pro‐oxidant (manganese stearate) on the degradation behavior of 70 ± 5 μ thickness films of LDPE, LLDPE and their blends. Films were prepared by film blowing technique in the presence of varying quantities of manganese stearate (0.5–1% w/w…
The coupled electronic and vibrational dynamics of exciton self-trapping are studied in the quasi-one-dimensional material $[\text{Pt}{(\text{en})}_{2}][\text{Pt}{(\text{en})}_{2}{\text{Br}}_{2}]\ensuremath{\cdot}{({\text{PF}}_{6})}_{4}$ ($\text{en}=\text{ethylenediamine}$) using femtosecond impulsive excitation techn…
Molecular beam techniques, temperature-programmed desorption (TPD), and reflection absorption infrared spectroscopy (RAIRS) are used to explore the relationship between krypton permeation through and the self-diffusivity of supercooled liquid methanol at temperatures (100-115 K) near the glass transition temperature,…
We have fabricated hexagonally patterned silver nanoparticles for surface-enhanced Raman scattering (SERS) by electrodepositing silver on the surface of an aluminum plate prepared by completely removing the oxide, except for a thin bottom barrier layer, from anodic aluminum oxide (AAO) templates. Even after removing t…
Abstract Degummed silk filament was pulverized with a home‐made machine to obtain silk fibroin (SF) powder, and the structure, morphology, and particle size of the SF powder were investigated. The individual spherical particles and aggregates with different morphology of silk fibroin coexisted in water. A waterborne p…
Compact polycrystalline samples of SrZn2Sb2 [space group $$ P\overline{3} m1 $$ , a = 4.503(1) Å, c = 7.721(1) Å] were prepared by spark plasma sintering. Thermoelectric performance, Hall effect, and magnetic properties were investigated in the temperature range from 2 K to 650 K. The thermoelectric figure of merit ZT…
In this Letter, we present results of dielectric measurements of water−propylene glycol oligomer mixtures at ambient and high pressure. The ν relaxation process that emerges with the addition of water exhibits unexpected behavior at elevated pressure. These features indicate local motions of water molecules as the ori…
Lactobionic acid (LBA) was synthesized from the direct aerobic oxidation of lactose under a very low O 2 concentration with high conversion (96%) and 100% selectivity over low loadings (1.02−0.64%) of bimetallic Pd−Bi supported on mesoporous SBA-15 silica material. Under alkaline conditions (pH 9), the catalyst exhibi…
We introduce a family of bounded repulsive potentials, which we call the cut ramp potential, obtained by cutting a linear ramp potential at different heights. We find that for the uncut ramp potential the system shows a region of anomalous re-entrant melting (a negative slope of the melting line in the temperature-pre…
A polyester polycaprolactone-based polyurethane elastomer (PU) and poly-(l-lactide) (PLLA), two common biomaterials, were electrospun to produce membranes with fibres either randomly orientated or aligned. PU was used to produce membranes consisting of smooth fibres. PLLA was used to prepare fibres with a textured sur…
Nonpolar ZnO films were grown epitaxially on (101̅0) sapphire substrates at 200 °C by atomic layer deposition with interrupted flow. The latter method improved the crystalline quality of ZnO films, transformed the structure from polycrystalline to epitaxial, and enhanced the optical properties of near-band-edge emissi…
Mechanical properties of large diameter welded steel pipes depend on the thermomechanically controlled rolled (TMCR) plate microstructure and UOE pipe-forming cold deformation sequence. Strength from plate to pipe may increase (work-hardening) or decrease (the Bauschinger effect). Bauschinger effect parameters depend…
A novel type of GaN-based LED with a highly polarized output using an integrated multi-layer subwavelength grating structure is proposed. Characteristics of both optical transmission and polarization extinction ratio of the polarized GaN-based LED with three different multi-layer subwavelength structures are investiga…
Abstract In this work, a series of biodegradable and pH‐responsive hydrogels based on polyphosphoester and poly(acrylic acid) are presented. A novel biodegradable macrocrosslinker α‐methacryloyloxyethyl ω‐acryloyl poly(ethyl ethylene phosphate) (HEMA‐PEOP‐Ac) was synthesized by first ring‐opening polymerization of the…
Invisibility devices have captured the imagination of humankind throughout the ages. In this paper, the response of a cylindrical cloak to a broadband electromagnetic (EM) pulse was experimentally investigated. The transformation medium of the cloak devices was realized with full parameters based on a nonuniform induc…
Nuclear-magnetic-resonance measurements of an iron (Fe)-based superconductor ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ ($x=0.08$ and 0.14) were performed at ambient pressure and under pressure. The relaxation rate $1/{T}_{1}$ for the overdoped samples $(x=0.14)$ shows $T$-linear behavior just above ${T}_{c}$…
Abstract The mixture of polyaniline (PANi) and PANi grafted multiwalled carbon nanotube (PANi‐ g ‐MWNT) was prepared by a two‐step reaction sequence. MWNT was first functionalized with 4‐aminobenzoic acid via “direct” Firedel‐Crafts acylation in polyphosphoric acid (PPA)/phosphorous pentoxide (P 2 O 5 ) medium to affo…
Abstract Poly( L ‐lactide acid)‐blend‐gelatin (PLLA‐gelatin) nanofibers were successfully fabricated by means of electrospinning. The different material components characterizing the properties of electrospun PLLA/G nanofibers were measured and the effect of PLLA weight ratios on such properties as morphologies, physi…
Reaction of Au(+) ((1)S(0) and (3)D) with O(2) and N(2)O is studied as a function of kinetic energy using guided ion beam tandem mass spectrometry. A flow tube ion source produces Au(+) primarily in its (1)S(0) (5d(10)) electronic ground state level but with some (3)D and perhaps higher lying excited states. The distr…