Materials Literature
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Temperature dependence of the current-voltage characteristics of Ag–La0.7Ca0.3MnO3–Pt heterostructures was investigated and the related current conduction mechanism was discussed. Poole-Frenkel emission and trap-controlled space charge limited current mechanisms are employed to explain the carrier transport at low and…
The authors report on fabrication and photoluminescent (PL) properties of ZnO∕Mg0.2Zn0.8O coaxial nanorod quantum structures with various quantum well and barrier layer thicknesses. Employing catalyst-free metal-organic vapor-phase epitaxy, coaxial nanorod single quantum well structures were fabricated by the alternat…
Density functional calculations are performed to investigate the functionalization of carbon nanotubes with the vacancy and carboxyl group that always appear in pairs after chemical oxidation (such as oxidative acid treatment). It is found that the geometrical structures and electronic properties of the nanotubes are…
Abstract Poly acrylic acid (PAA) and its stoichiometric complexes with trivalent rare earth (RE) have been synthesized and well characterized by means of elemental analysis, IR, TG‐DTA, fluorescence spectra, etc. Chemical analysis indicated that the molar ratio of COO − and RE 3+ in the complex was closely dependent…
Abstract Poly(3‐hydroxy octanoate) (PHO), poly(3‐hydroxy butyrate‐ co ‐3‐hydroxyvalerate) (PHBV), and linoleic acid were grafted onto chitosan via condensation reactions between carboxylic acids and amine groups. Unreacted PHAs and linoleic acid were eliminated via chloroform extraction and for elimination of unreacte…
Abstract A novel poly(acrylic acid)/attapulgite (APT)/sodium humate (SH) superabsorbent composite was synthesized through the graft copolymerization reaction of acrylic acid on APT micropowder and SH with N,N ′‐methylene bisacrylamide as a crosslinker and ammonium persulfate as an initiator in an aqueous solution. Var…
Abstract Polyindole fibers upto a length of 1000 μm and ∼ 25 μm in diameter have been reproducibly synthesized by interfacial polymerization, which was performed at a stationary interface of aqueous (FeCl 3 solution)/organic (indole in dichloromethane) biphasic system. On the other hand, disturbing the aqueous/organic…
Li is present in hydrothermally grown ZnO at high concentrations and is known to compensate both $n$- and $p$-type doping due to its amphoteric nature. However, Li can be manipulated by annealing and ion implantation in ZnO. Fast, $20\phantom{\rule{0.3em}{0ex}}\mathrm{ms}$ flash anneals in the $900--1400\phantom{\rule…
Abstract Polypropylene/clay nanocomposites are attractive candidates for applications requiring good barrier properties because of the inherent features of the polymer matrix. To assess their potential, systematic research relating the barrier performance to the structural characteristics of polypropylene/montmorillon…
Spin-polarized density functional theory is used to investigate the electronic and structural properties of vacancies and antisites in zigzag, armchair, and chiral SiC nanotubes. Antisites present lower formation energies compared to vacancies, introducing an empty electronic level close to the bottom of the conductio…
Abstract A novel mixed micelle with a multifunctional core and shell is successfully prepared from a graft copolymer, poly( N ‐isopropyl acrylamide‐ co ‐methacrylic acid)‐ g ‐poly( d,l ‐lactide) (P(NIPAAm‐ co ‐MAAc)‐ g ‐PLA) and two diblock copolymers, poly(ethylene glycol)‐ b ‐poly( d,l ‐lactide) and poly (2‐ethyl‐2‐…
Molecular dynamics (MD) simulation is employed to compute thermal conductivity and dispersion curves for bulk silicon using the environment dependent interatomic potential. Thermal conductivity simulations using the Green-Kubo method are found to converge to the bulk value with 216 atoms or more. Computed values in th…
Abstract To illustrate the importance of cationic groups within hard segments on shape memory effect in segmented polyurethane (PU) cationomers, the shape memory polyurethane (SMPU) cationomers composed of poly(ε‐caprolactone) (PCL), 4,4′‐diphenylmethane diisocyanate (MDI), 1,4‐butanediol (BDO), and N ‐methyldiethanol…
Abstract The morphology and electrical properties of linear low density polyethylene (LLDPE)/poly (ethylene‐methyl arylate) (EMA) blends filled with carbon black (CB) are investigated in this work. Comparing to LLDPE/CB composite, the higher percolation threshold of EMA/CB composite is attributed to the good interacti…
Ultraviolet photoelectricity based on the vicinal cut as-supplied SrTiO3 single crystals has been experimentally studied in the absence of an applied bias at room temperature. An open-circuit photovoltage of 130ps rise time and 230ps full width at half maximum was observed under the irradiation of a 355nm pulsed laser…
Abstract An inexpensive and simple method was adopted for the preparation of chitosan beads, crosslinked with glutaraldehyde (GA), for the controlled release of diclofenac sodium (DS). The beads were prepared by varying the experimental conditions such as pH, temperature, and extent of crosslinking. The absence of any…
The authors report on fabrication and electrical characterization of ferroelectric nanotubes and metal-ferroelectric-metal composite nanotubes using silicon and ZnO nanowires as positive templates. Nanotubes of high aspect ratio with a minimum inner diameter of about 100nm and a length ranging from 0.5μm to a few micr…
Abstract The expression and distribution of enzymes differ by the types and states of cells, tissues, and organs, thus leading to diverse extracellular and intracellular environments. Using an enzymatic reaction to convert a precursor into a hydrogelator or vice versa, one can control the delivery, functions, and resp…
Abstract A series of homopolymer polypropylenes (PPs), within a weight‐average molecular weight ( M w ) range of 100–1600 kg/mol, were manufactured as dumbbell microspecimens. The effects of the molecular weight and shear‐induced crystallization on the mechanical properties and morphology were studied to gain a better…
Abstract A sonochemical technique was developed to infuse Cloisite clay nanoparticles into phenolic foam materials. Phenolic resin solution (Part A) was mixed with clay particles, and irradiated using a high intensity ultrasonic liquid processor. In the next step, the modified phenolic resin solution containing clay p…