Materials Literature
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Abstract Polysiloxane–polyester copolymers have been synthesized for the first time by direct polycondensation of a series of diacids (butanedioic, hexanedioic, and octanedioic acid) and α,ω‐bis(3‐hydroxypropyl) polydimethylsiloxanes catalyzed with Novozyme‐435 in high yields (>90%) without the cleavage of SiO bon…
Abstract The effects of mechanical mixing and filler–filler (F–F) and polymer–filler (P–F) interactions on the normalized state of a filler microdispersion [ d ( x )] and the viscoelastic properties of silica‐filled rubbers were studied. The rubbers were prepared with or without the addition of n ‐octyl‐triethoxysilan…
Abstract Experimental results are discussed which deal with metallic conductivity in partially conjugated and undoped polyamidine thin films placed between metallic electrodes. In the framework of a model, the electrification effect due to metallic electrodes plays the significant role in obtaining metallic conductivi…
We first report a simple and rapid electrochemical approach to synthesize novel nanofiber junctions and dendrites of conducting poly(o-phenylenediamine) without any surfactant or template. Through controlling some parameters such as the time and potential of electrodeposition and concentration of the reactant, nanofib…
Abstract The free‐radical grafting of the multimonomer system of pentaerythritol triacrylate (PETA) and styrene (St) onto polypropylene (PP) in the melt state was studied by reactive extrusion. The effects of the St and initiator concentrations on the grafting reaction were investigated by means of the melt flow rate,…
The nature of coupling among the L10 FePt hard and FexB (x=2,3) soft magnetic phases in FePtB nanocomposite thin film magnets is investigated by measuring the hysteresis loops and δM (Henkel) plots. The FePtB thin films deposited under optimized sputtering conditions are shown to have almost fully exchange-coupled sof…
Two types of mercury selenide nanostructures, nanotowers and nanoscale dendrites, have been created with good control and high yield by a solution–liquid–solid process. Alternating twinned structures have been achieved in both the nanotowers and the nanodendrites, which originate from self-oscillations of local reacti…
TiO2 was used as a catalyst for crosslinking of cellulose using citric acid by pad-dry-cure method. Different factors affecting crosslinking were studied, including TiO2 concentration, curing temperature, curing time, and citric acid concentration. The results obtained indicate that TiO2 has the ability to catalyze cr…
We hereby describe the modifications induced in a Cu thin film induced by different oxidation processes. By using plasma assisted deposition, we have adsorbed oxygen onto the $\mathrm{Cu}∕\mathrm{Zn}\mathrm{O}(0001)\text{\ensuremath{-}}\mathrm{Zn}$ surface. Cu was deposited on the sputtered-annealed ZnO substrate at r…
Utilizing the chemical reduction of FeCl2 with NaBH4 in the presence of 2:17 Sm–Co powders, we synthesized composite Sm(Co0.699Fe0.213Cu0.064Zr0.024)7.4/nano-Fe anisotropic hard magnetic powders. The average particle size of the hard magnetic core powder was 21μm while the soft magnetic Fe nanoparticles deposited unif…
In this article, a set of blends was prepared from ground rubber tires (GRT) and linear low-density polyethylene (LLDPE). The effects of kneading time and functional polymers on the mechanical properties of the blends were investigated. It was found that the blend which contained styrene-butadiene-styrene (SBS) copoly…
Novel high-boiling liquid/liquid systems were introduced for the synthesis of semiconductor and noble metal nanocrystals. Polyols and long-chain hydrocarbons were utilized to form such two-phase systems. Because of the high-boiling nature, these systems may be conveniently employed for nanocrystal synthesis at relativ…
We have studied the thickness dependence of the structural and magnetic properties of ultrathin Fe3Si films grown on GaAs(001). The onset of ferromagnetism is found to be at about 3 ML at low temperatures. Furthermore, a reorientation of the uniaxial in-plane magnetic anisotropy takes place when the thickness of the f…
The damping properties of ethylene-propylene-diene rubber (EPDM) with aliphatic hydrocarbon (C94) resin were investigated by dynamic mechanical analysis (DMA). It was found that the damping property of EPDM was improved after addition of aliphatic hydrocarbon resin. With increasing content of the resin, the main tan δ…
We have demonstrated the fabrication and characterization of single-layered hybrid polymer-quantum-dot light-emitting diodes (PQD-LEDs) with the emissive composite film of 2,3-dibutoxy-1,4-poly(phenylene vinylene) (DBPPV) and inorganic CdSe-ZnS core/shell quantum dots (QDs). It is observed that both the electrical and…
This Communication demonstrates how selectively functionalized, patterned microscale wells can be used as small-volume (fL) crystallization vessels to grow protein crystals. This surface-patterned approach enables proteins to be crystallized with well-controlled shapes and uniform sizes from 3 μm down to 600 nm. Three…
This work reports the first example to synthesize squarely mesoporous and functional nanocomposites by self-directed assembly of porphyrin-bridged silsesquioxane. Due to the formation of robust silica networks around conjugated porphyrin moieties, the resultant mesoporous materials exhibit excellent optoelectronic pro…
There has been limited development in catalyst carriers for magnetic separations where superparamagnetic nanoparticles of a high saturation magnetization with no coercivity are required to isolate expensive catalyst reagent that are subjected to repeated magnetic cycles. By using simple stepwise layer-by-layer nanoche…
We develop a classical theory of electron confinement in conducting nanoparticles. The theory is used to compute the nonlinear optical response of the nanoparticle to a harmonic external field.
Well-defined arrays of titania nanoposts are generated by using high aspect-ratio cylindrical nanopore templates. The simple and controllable fabrication scheme of the nanoporous templates makes them very attractive for creating well-defined nanostructures out of a variety of functional materials. The arrays of titani…