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Structure of pluronic F-127 and its tetraphenylporphyrin complexes: X-ray diffraction study
The structure of pluronic F-127 and its complexes with tetraphenylporphyrin has been studied by SAXS and WAXS techniques. It has been shown that the samples prepared via evaporation of chloroform and aqueous solutions of pluronic and its mixtures with tetraphenylporphyrin have a semicrystalline layered structure with…
Kinetics of K release from soils of Brazilian coffee regions: effect of organic acids
Kinetic studies on soil potassium release can contribute to a better understanding of K availability to plants. This study was conducted to evaluate K release rates from the whole soil, clay, silt, and sand fractions of B-horizon samples of a basalt-derived Oxisol and a sienite-derived Ultisol, both representative soi…
Carrier concentration tuning of bandgap-reduced p-type ZnO films by codoping of Cu and Ga for improving photoelectrochemical response
In this study, the synthesis of p-type ZnO films with similar bandgaps but varying carrier concentrations through codoping of Cu and Ga is reported. The ZnO:(Cu,Ga) films are synthesized by rf magnetron sputtering in O2 gas ambient at room temperature, followed by postdeposition annealing at 500°C in air for 2h. The b…
Electrical Properties of Carbon Nanotubes Grown at a Low Temperature for Use as Interconnects
We measured the electrical properties of vertically aligned carbon nanotubes (CNTs) synthesized from via holes by radical chemical vapor deposition at a low temperature of 390 °C, which meets the requirements of the Si large scale integration (LSI) process. To use the CNTs could be used for LSI wiring, we applied chem…
Response Characterization of Electroactive Polymers as Mechanical Sensors
The characterization of the dynamic response (including transfer function identification) of trilayer polypyrrole (PPy) type conducting polymer sensors is presented. The sensor was built like a cantilever beam with the free end stimulated through a mechanical lever system, which provided displacement inputs. The volta…
Nanoporous Carbon Films from “Hairy” Polyacrylonitrile‐Grafted Colloidal Silica Nanoparticles
Polyacrylonitrile (PAN) is grafted from colloidalr silica nanoparticles by atom transfer radical polymerization (see figure). Atomic force microscopy of these inorganic/organic hybrids confirms their well-defined, “hairy” structure. Carbonization of the PAN corona and subsequent etching away of silica nanoparticle cor…
Comparison of the Effects of Cotton Yarns Produced by New, Modified and Conventional Spinning Systems on Yarn and Knitted Fabric Performance
This research, which is divided into two parts, is a comparative study of the physical properties of cotton yarns produced by using new, modified and conventional spinning methods. The first part focuses on the performance of yarns with a final count of Ne 20 produced by conventional and compact spinning methods, wher…
Facile Synthesis of Polyaniline-Supported Pd Nanoparticles and Their Catalytic Properties toward Selective Hydrogenation of Alkynes and Cinnamaldehyde
We report a facile method toward preparation of conducting polymer-supported Pd nanoparticles by in situ reducing the palladium salt [Pd(NO 3 ) 2 ] on the surface of polyaniline (PANI) film/membrane. The palladium(0) particles distribute evenly on the PANI surfaces. The size and morphology of Pd particles are dependen…
Asymmetric Flexible Supercapacitor Stack
Electrical double layer supercapacitor is very significant in the field of electrical energy storage which can be the solution for the current revolution in the electronic devices like mobile phones, camera flashes which needs flexible and miniaturized energy storage device with all non-aqueous components. The multiwa…
Optical properties of diatom silica frustule with special reference to blue light
Using fresh water diatom, identified as Melosira variance which is growing faster than other algae in the ponds, we characterized the ultrastructure of its silica frustule by electron microscopic observations. On hypothesizing that the ultrastructure has some meanings in photosynthesis, behaviors of a single frustule…
Tunable Electrochemical Switch of the Optical Properties of Metallic Nanoparticles
Control of the optical properties of oblate metallic nanoparticles (NP) is realized using an electrochemical switch consisting of a thin layer of conducting polymer (CP). Reversible modulation, moderate damping, and almost total quenching of the localized surface plasmon (LSP) resonance is achieved as a function of th…
Polymerically modified layered silicates: an effective route to nanocomposites.
Polymer/clay nanocomposites have been under an extensive investigation for about 15 years. Traditional methods to modify the clay are usually limited to small organic cations, preferably containing long alkyl chain(s), which are exchanged with the inorganic cations in the clay gallery. This article provides a comprehe…
Buckling analysis of carbon nanotubes modeled using nonlocal continuum theories
In this paper, the buckling of carbon nanotubes, modeled as nonlocal one dimensional continua within the framework of Euler–Bernoulli beams, is considered. Both a stress gradient and a strain gradient approach are considered and a variational approach is adopted to obtain the variationally consistent boundary conditio…
Dielectric relaxations in PVDF/BaTiO3 nanocomposites
The present work aims at the study of molecular relaxations in PVDF/BaTiO3 nanocomposites using broadband dielectric spectroscopy. The nanocomposites of PVDF with BaTiO3 (10–30% by wt%) are prepared using simple melt mixing method. In dielectric permittivity study, two relaxation processes are identified corresponding…
Novel azo-peresters radical initiators used for the synthesis of acrylic pressure-sensitive adhesives
Acrylic pressure-sensitive adhesives (PSA) based on two monomers: 2-ethylhexyl acrylate and acrylic acid were synthesized in organic solvent ethyl acetate using AIBN (2, 2'-azo-diisobutyronitrile) and new synthesized azo-peresters as radical initiators. After polymerization the viscosity, molecular weight and polydis…
Plastics and composites based on renewable resources: end-of-life recycling and recovery issues
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Suzuki coupling reactions catalyzed by poly(N-ethyl-4-vinylpyridinium) bromide stabilized palladium nanoparticles in aqueous solution
InIn this work, it was investigated to use of poly(N-ethyl-4-vinylpyridinium) bromide stabilized palladium nanoparticles in the Suzuki reaction between phenylboronic acid and aryl halides in aqueous solution. The nanoparticles were isolated and re-used several times with low loss of activity.
Modification of (DGEBA) epoxy resin with maleated depolymerised natural rubber
In this work, diglycidyl ether of bisphenol A (DEGBA) type epoxy resin has been modified with maleated depolymerised natural rubber (MDPR). MDPR was prepared by grafting maleic anhydride onto depolymerised natural rubber. MDPR has been characterized by Fourier transform infrared (FT-IR) spectroscopy and nuclear magnet…
Synthesis and characterization of styrene-co-divinylbenzene-graft-linseed oil by free radical polymerization
A variety of opaque white to light yellow polymeric material have been prepared by two methods, one copolymerization of styrene (ST), divinylbenzene (DVB), and grafting of linseed oil (LIN), and the second involves the copolymerization of the same comonomers with pre-reacted (with initiator) linseed oil. All of the re…