Materials Literature
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The nonstoichiometric Al-rich single-crystal mullite nanocolumns were prepared by sol-gel method through the self-catalyzed growth process. The rectangular nanocolumns are straight and uniform with a width of 100–150 nm and length of 3–4 μm. Detailed structural characterizations suggested that the growth of this novel…
Abstract Miscibility studies have been conducted on solutions of blends of polyacrylamide (PAAm) and polyethylene glycol (PEG) over an extended range of concentrations in water. The ultrasonic velocity, viscosity, density, and refractive index of the blends have been measured for different compositions viz., 0/100, 10…
Deep level transient spectroscopy measurements were performed to investigate the effect of Nb2O5 and Cr2O3 on the electronic states of SnO2-based varistors. Two electron traps, Ec−0.30(±0.01)eV and Ec−0.69(±0.03)eV, were identified in both SnO2–CoO–Nb2O5 and SnO2–CoO–Nb2O5–Cr2O3 varistors. These two traps could be ass…
Abstract The magnetic structure of the olivine type Mn 2 GeSe 4 is investigated by powder neutron diffraction between 2 K and ambient temperature. Based on a number of “magnetic reflections” occurring below T c = 66 K a model for the magnetic structure of the Mn 2+ ions (d 5 ) is derived by structure refinements based…
Abstract Electropolymerization of poly‐( o ‐phenylenediamine) (PoPD) film was performed in a micellar aqueous solution containing sodium dodecyl benzene sulfate (SDBS) by cyclic voltammetry at conducting glass electrode. The experimental results showed that the anionic micelle, i.e., SDBS, can greatly catalyze the ele…
Abstract Rubbery polymer scaffolds for tissue engineering were produced using templates of the pore structure. The last step in the fabrication process consists of dissolving the template using a solvent that, at the same time, swells the scaffolding matrix that was a polymer network. Sometimes the polymer matrix is s…
Abstract Rachford-Rice iterations are widely used in equation-of-state (EOS) flash calculations to determine phase equilibrium compositions from constant equilibrium ratios (K-values). The method, however, can be slow to converge and in some cases may not converge at all. This paper presents a simpler and more robust…
We report on a thermodielectric bistability in dual frequency nematic liquid crystals (LCs) caused by the anisotropic nature of dielectric heating and director reorientation in an electric field. The bistability is a result of the positive feedback loop: director reorientation --> anisotropic dielectric heating --> di…
We report a comparison of the specific-heat measurements on isoelectronic Cu-Zn-Al shape-memory alloys in the parent cubic phase $(L{2}_{1})$ and in the close-packed martensitic phase $(18R)$. Measurements were made by thermal-relaxation calorimetry over the temperature range $1.9\ensuremath{\leqslant}T\ensuremath{\le…
The light-emission and current-voltage properties of n-type nanoporous silicon (n-NPS) with a hole assistance of buried p layer are explored. The influences of anodic current density on the formation, morphology, and properties of n-NPS are measured. Such n-NPS films have nanoscaled pores and high-aspect-ratio pillars…
Abstract This article reports the synthesis, characterization, and damping characteristics of semi‐interpenetrating (semi‐IPN) latex systems composed of poly n ‐butyl acrylate (PBA) core and poly n ‐butyl methacrylate (PBMA) shell. The IPN's were prepared by seeded emulsion polymerization using crosslinked PBA seeds w…
The authors found experimentally that carbon nanotube field-effect transistors (CNFETs) could exhibit n-type characteristics even though their electrodes consist of a large-work-function metal such as Co. To explain their result, which is contrary to the general belief that CNFETs with large-work-function electrodes a…
Abstract A new diamine monomer containing flexible sulfone, sulfide, and amide units was prepared via three steps. Nucleophilic chloro displacement reaction of 4‐aminothiophenol with 4‐nitrobenzoyl chloride in the presence of propylene oxide afforded N ‐(4‐mercapto‐phenyl)‐4‐nitrobenzamide and subsequent reduction of…
It has been attempted to derive the structural properties of bulk multiwall carbon nanotubes (MWCNTs) from a combination of powder diffraction and principal component analysis (PCA). By a transformation of the direct PCA basis functions to a structural parameter set it was possible to obtain average values of inner ra…
Abstract Rigid PVC microstructure strongly depends on processing conditions: under both shear and heat influence, gelation process occurs, and the resulting morphology can be characterized by the so‐called gelation level parameter. But thermomechanical history also affects several other features of the microstructure.…
Abstract Polyimide/silica (PI/SiO 2 ) nanocomposite films with 10 wt % of silica content were prepared by sol–gel process under the conditions with and without additional water. The presence of additional water has great effect on the silica particle size and thus on the properties of the prepared PI/SiO 2 films. The…
Abstract In this study, three kinds of L ‐lactide‐based copolymers, poly(lactide‐co‐glycolide) (PLGA), poly(lactide‐co‐ p ‐dioxanone) (PLDON) and poly(lactide‐co‐caprolactone) (PLC), were synthesized by the copolymerization of L ‐lactide (L) with glycolide (G), or p ‐dioxanone (DON) or ε‐caprolactone (CL), respectivel…
A liquid laser medium with a lifetime of 492μs and a fluorescent quantum efficiency of 52.5% has been presented by stably dispersing dimethyl dichorosilane-modified Nd2O3 nanoparticles in dimethylsulfoxide. Its optical properties and mechanism were investigated and explained by fluorescence resonance energy transfer t…
Abstract A polymeric hindered amine light stabilizer (HALS), where HALS moiety was attached at the terminal end of the polypropylene chain via end‐functionalized vinylidine PP through simple organic reactions, was synthesized. It comprises the synthesis of vinylidine‐terminated polypropylene by using Cp 2 ZrCl 2 /MAO…
The article reports on low-temperature high-rate sputtering of hydrophilic transparent TiO2thin films using dc dual magnetron (DM) sputtering in Ar + O2mixture on unheated glass substrates. The DM was operated in a bipolar asymmetric mode and was equipped with Ti(99.5) targets of 50 mm in diameter. The substrate surfa…