Materials Literature
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As versatile synthetic intermediates for new photoswitchable molecules with a tetramethylindanylindane (stiff-stilbene) core, the cis and trans isomers of 5,16-dibromo-2,2,13',13'-tetramethylindanylindanes 2 were synthesized by the Barton-Kellogg coupling. The bromine atoms of trans-2 could be readily replaced with al…
Abstract Plastic Shottky barriers were fabricated using poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT:PSS) and aluminum as the p-type semiconductor and the metal, respectively, by a facile line-patterning technology in which multiple-line-patterning was utilized for the designed patterns.…
The flavin mononucleotide (FMN) quinones in flavodoxin have two characteristic redox potentials, namely, Em(FMNH./FMNH-) for the one-electron reduction of the protonated FMN (E1) and Em(FMN/FMNH.) for the proton-coupled one-electron reduction (E2). These redox potentials in native and mutant flavodoxins obtained from…
We propose a degenerate Allen–Cahn/Cahn–Hilliard system coupled to a quasi-static diffusion equation to model the motion of intergranular voids. The system can be viewed as a phase field system with an interfacial parameter \gamma . In the limit \gamma \to 0 , the phase field system models the evolution of voids by su…
The adsorption of tris(2,2'-bipyridine)ruthenium(II) ([Ru(bpy)(3)]2+) complex cation into modified mesoporous silicas was investigated. In order to immobilize [Ru(bpy)(3)]2+, the mesopore surface was modified with sulfonic acid groups by the reactions between MCM-41 and phenethyl(dichloro)methylsilane and the subseque…
Organoclays were prepared from two tunisian purified Na-bentonites using benzyltetradecyldimethylammonium chloride ( C14 ) and benzyldodecyldimethylammonium chloride ( C12 ). The added quantities of organic salts, expressed as a function of the clay's cationic exchange capacity (CEC), have been varied from 0.3 to 4 CE…
We form pn -junctions by electrostatic binding of a p -type and an n -type ZnO nanoparticle. Current−voltage characteristics of pn -junctions are rectifying in nature. Individual components of the junction do not show any rectification. An np -junction, formed by reversing the binding sequence of the two types of nano…
We demonstrate the time- and concentration-dependent dissolution (etching) of polyelectrolyte multilayer (PEM) films comprised of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) immersed in NaCl solutions. PEM thickness decreases to a reproducible unchanging value that depends upon the initial film t…
Large-scale uniform dumbbell-like ZnO microcrystals were successfully synthesized via a facile solution method under mild conditions. The as-prepared dumbbells, with lengths of 3.5-5.4 microm and diameters of 1.3-1.8 microm, possess a single-crystal hexagonal structure and grow along the [0001] direction. The influenc…
This paper presents the research on the structure and compressive stress or compressive strength of mineral wool products. The products of chaotic, directional and combinative fibres structure have been studied visually and microscopically. During mechanical tests it was determined that compressive stress (compressive…
Layered organic−inorganic hybrid materials were synthesized by pillaring with viologen and nitroaniline compounds which are intercalated between magadiite layers. The bridged silsesquioxanes, 4,4‘-bis(trimethoxysilylpropyl)viologen and 4-nitro- N, N ‘-bis(3-trimethoxysilyl)propylaniline react with the surface silanol…
The effect of cobalt precursor on the structure of Co supported multi-walled carbon nanotubes (MWCNTs) were studied by using X-ray photoelectron spectroscopy (XPS). MWCNTs were treated with a mixture of nitric and sulfuric acids and decorated with cobalt and/or cobalt oxides via aqueous impregnation solutions of cobal…
The inorganic−organic hybrid layered material of stoichiometry [DAMS + ][Ag 5 I 6 - ], characterized by a strong SHG activity, has been prepared mechanochemically by room-temperature ball-milling a mixture of AgI and [DAMS + ][I - ], eventually followed by a moderate heating. By means of electronic absorption spectra,…
The present study describes a simultaneous and highly reproducible large-scale synthesis of six (and more) colors of size-homogeneous and highly luminescent CdSe quantum dots in a single reaction, controlled by a slow-increasing temperature gradient. The described protocol allows a precise control and a synchronized i…
Understanding the effects of substituents on the spectra of chlorins is essential for a wide variety of applications. Recent developments in synthetic methodology have made possible systematic studies of the properties of the chlorin macrocycle as a function of diverse types and patterns of substituents. In this paper…
High Resolution Image Download MS PowerPoint Slide The size and shape of pores is a key factor in the successful deployment of mesoporous silicas as supports for high-activity catalytic nanoparticles. Critical concerns are the accessibility of catalyst particles to reactant species, the effect of the particle−support…
Monomeric amorphous systems involving an upper azo-based layer and a lower fluorophore layer have been carefully designed to enable holographic formation of micrometric emissive photopatterns through reversible photoinduced mass migration of azoderivatives. The fluorescent patterns evidenced by NIR biphotonic excitati…
The optical absorption spectra and redox properties are presented for 24 synthetic zinc chlorins and 18 free base analogs bearing a variety of 3,13 (beta) and 5,10,15 (meso) substituents. Results are also given for a zinc and free base oxophorbine, which contain the keto-bearing isocyclic ring present in the natural p…
Dispersing particles within a semicrystalline polymer can result in remarkable impact strength improvement and opens promising routes toward super-tough materials. Although the technique is extensively employed to modify polymer properties, predicting which dispersions yield toughness remains a challenging issue. By c…
The hydrolysis of degreased cotton in formic acid has been studied in this paper. Hydrochloric acid is added as a catalyst. The crystalline index of degreased cotton decreases gradually with the increase in treatment time. The effects of the reaction temperature (from 55 to 65 °C) and reaction time (from 2 to 9 h) on…