Materials Literature
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Herein we report the oxidative chemical polymerization of thieno[3,4-b]thiophene (T34bT) using several different oxidants including ferric sulfate, ammonium persulfate, and hydrogen peroxide in the presence of poly(styrenesulfonic acid) in water and properties of the resulting poly(thieno[3,4-b]thiophene)-poly(styrene…
The magnetic properties of $L\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\gamma}}$ cobalt oxides with different types of oxygen ions ordering within $[L{\mathrm{O}}_{\ensuremath{\gamma}}]$ layers are discussed. Symmetry arguments are used to analyze the models of the magnetic ground state proposed for thes…
A novel ferromagnetic/semiconductor oxide nanocomposite formed by arrays of Ni nanocylinders grown by the electrodeposition technique in a semiconductor oxide matrix of self-aligned and randomly disordered titanium dioxide nanotubes has been synthesized. X-ray diffraction, EDX, SEM, AFM, rf-GDOES and VSM magnetometry…
Abstract A thermodynamic study on the interaction between magnesium ion and human growth hormone (hGH) was studied at 27°C in NaCl solution (50 mM) using different techniques. Two techniques of ionmetry using a Mg 2+ selective membrane electrode and isothermal titration calorimetry were applied to obtain the binding i…
Nanocrystals – your flexible friends! The use of nanocrystals as precursors for the one-step formation of flexible functional films by using an air plasma is demonstrated. This treatment does not harm the photoluminescence of the individual nanocrystal building blocks but confers on them resilience to bending as well…
We demonstrated the use of electrohydrodynamic atomization to prepare uniform-sized emulsion droplets in which equal spheres of silica or polystyrene were dispersed. The size of the emulsion droplets was easily controlled by the electric field strength and the flow rate, independently of the diameter of the nozzles. D…
This work demonstrates the first example of the controlled organization of semiconducting nanoparticles (NPs) using amphiphilic block copolymer self-assembly at the air-water interface. Preferential interactions between polystyrene-functionalized NPs and the polystyrene block of an amphiphilic polystyrene-b-poly(ethyl…
High temperature heat treatment (HTT) of bundled single-walled carbon nanotubes (SWNTs) in vacuum ( approximately 10(-5) Torr) has been found to lead to the formation of two types of graphitic nanoribbons (GNRs), as observed by high-resolution transmission electron microscopy. Purified SWNT bundles were first found to…
Three novel cyanide-bridged heterobimetallic coordination polymers have been synthesized by hydrothermal routes, in superheated water solutions, by using K3[Co(CN)6], NiCl2.6H2O, and alpha-diimine ligands: [Ni(CN)4Co(phen)] (1; phen = 1,10-phenanthroline), [Ni(CN)4Co(2,2'-bipy)] (2; 2,2'-bipy = 2,2'-bipyiridine), and…
Vinyl acetate is processed to produce polymers and copolymers used in water based paints, adhesives, paper coatings or nonwoven binders and various applications at moderate temperatures. The polymerization processes used include solution, suspension and emulsion processes. Many incidents involving the runaway polymeri…
The early stages of ZnS nanoparticle growth from supersaturated solution are investigated in situ by stopped-flow UV absorption spectroscopy with a time resolution of 1.28 ms. A model for data analysis is suggested which makes it possible to study both the average particle radius and the concentration. The average rad…
Polymer-encapsulated silica: An imidazolium-based room-temperature ionic liquid (PyC12MIM+Br−) bearing a terminal pyrrole group was synthesized. Using this novel polymerizable surfactant as a template in a sol–gel process, highly ordered hexagonal mesoporous silica, containing aligned superlong polypyrrole nanowires,…
A simple and versatile one-pot sol–gel synthesis of Eu 3+ -doped nanocrystalline TiO 2 and ZrO 2 nanomaterials is reported in this paper. It consists of the controlled crystallization of Eu 3+ -doped TiO 2 or ZrO 2 nanoparticles from an initial solution containing the metal alkoxide, the lanthanide precursor, a comple…
We use time-resolved Faraday rotation to measure coherent spin dynamics in colloidal CdSe quantum dots charged in an electrochemical cell at room temperature. Filling of the $1{S}_{\mathrm{e}}$ electron level is demonstrated by the bleaching of the $1{S}_{\mathrm{e}}\ensuremath{-}1{S}_{3∕2}$ absorption peak. One of th…
Growth of urea crystals in a supersaturated solution of urea was spatially controlled by irradiation with a femtosecond laser pulse. When a needlelike urea crystal was irradiated by a single femtosecond laser pulse with wavelength of 800 or 1470 nm through an objective lens, a new needlelike crystal grew from the lase…
This article presents a batch carbonation method with ultrasonication to synthesize monodispersed nanoparticles of calcium carbonate (CaCO3). The synthesis processes with and without ultrasonication were compared. The results showed that the application of ultrasonication into the synthesis caused a supersaturation of…
The effect of complementary base pairing on the oxidation potential of a guanosine derivative has been determined by cyclic and differential pulse voltammetry in CHCl3. The formation of the Watson-Crick H-bonded complex lowers the oxidation potential of the free molecule by 0.34 V, which compares well with the value o…
Binary organogels were prepared from coaggregates of azobenzene-tethered melamine dimer and cyanurate/barbiturates. In the gels of hydrocarbon liquids, the coaggregates formed heavily entangled nanofibers, morphologies of which are dramatically different from the previously reported coaggregates based on flexible dode…
Cadmium selenide (CdSe) thin films were chemically deposited at room temperature, from aqueous ammoniacal solution using Cd(CH(3)COO)(2) as Cd2+ and Na(2)SeSO(3) as Se2- ion sources. The as-deposited films were uniform, well adherent to the glass substrate, specularly reflective, and red-orange in color. The as-deposi…
Organic/inorganic hybrid monolayers, consisting of an oval decatungstoeuropate (EuW10) with photoluminescence and a series of gemini-type amphiphiles with various lengths of the flexible hydrophobic spacers, were formed through electrostatic interaction at the air/water interface. The ultrathin hybrid multilayer films…