Materials Literature
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Abstract Plasticized polymer materials have taken an enormous role in our everyday life. Most of the common plasticizers are aromatics, esters of phthalic acid. Since they are not chemically bonded to the polymer matrix, they can be released from material while being used. The concerns raised about toxicity led to a l…
Zn K edge and O K edge x-ray absorption near-edge structure (XANES) spectra of ZnO surfaces are calculated. The difference between theoretical XANES for ZnO surfaces and ZnO bulk is then compared to the earlier observed differences between experimental XANES for ZnO nanostructures and ZnO bulk as taken from the litera…
We developed a straightforward synthesis of gold nanoparticles with diameters in the range 2.1-7.0 nm which display solubility in both aqueous and nonpolar (toluene, chloroform) media. This versatile solubility of the nanoparticles is achieved by the use of a thiolated PEG capping agent. Their plasmon resonance band i…
Abstract Dynamic heterogeneity is now recognized as a central aspect of structural relaxation in disordered materials with slow dynamics, and was the focus of intense research in the last decade. Here, this chapter describes how initial, indirect observations of dynamic heterogeneity have recently evolved into well‐de…
The adsorption of and conformation adopted by a branched-linear polymer conjugate to the hydrophilic silica-aqueous solution interface have been studied by in situ null ellipsometry and Monte Carlo simulations. The conjugate is a highly branched polyethyleneimine structure with ethyleneoxide chains grafted to its prim…
The structure and properties of some blends obtained by mixing two semicrystalline samples of isotactic polypropylene (iPP) characterized by different degree of stereoregularity have been analyzed in the whole range of composition. The two components are a highly isotactic and crystalline sample (iPP1) and a stereoirr…
The kinetics of chiral scandium(III)-catalyzed hydroxymethylation of silicon enolates using aqueous formaldehyde have been investigated, and a reaction mechanism of this process in organic/aqueous medium is proposed.
The effects of seed preparation method and operating conditions during the batch cooling crystallization of adipic acid in aqueous solution are reported. Seeds were prepared by cooling crystallization with and without ultrasound and by grinding commercial crystals. The effects of cooling rate, initial concentration, s…
Dense and highly porous silicon oxycarbide ( Si–O–C ) submicrometer‐sized spheres, with diameters in the range 100–400 nm are synthesized through pyrolysis of sol–gel‐derived hybrid precursors. A modified Stöber process is used for the synthesis of silsesquioxane submicrometer‐sized particles from different organotrie…
Watching the changes: Aberration-corrected transmission electron microscopy is used to image CeO2 nanoparticles during an electron-beam-induced structure transformation. Analysis of the phase of the computationally restored exit wavefunction (see Figure, a) allows the nature of the different surfaces (b) to be charact…
The axial positions of planar metallomacrocycles are unoccupied. The positively charged metal is thus a potential binding site for electron-donating groups. The binding strength is affected by the central metal, the ligand, and the macrocycle. One ligand leads to the out-of-plane displacement of the central metal, whe…
Abstract Density functional theory (DFT) calculations were performed by using FP‐LAPW method to investigate the effect of defects on the electronic and magnetic structure of Fe 2 MnSi Heusler alloy. The formation energies were calculated for antisite, swap, and vacancy defects. We found that three defects, namely Mn F…
Abstract A large quantity of linear strain and LCTE data from −55 °C to 75 °C on LX‐17, PBX 9502 and ultrafine TATB (ufTATB) is presented. Axial and diametral measurements are blended to give final densities, which agree with the liquid immersion values of Baytos et al. The nominal densities at 21, −55 and 75 °C in g…
An investigation is reported of the probability and the probability density of thermal activation of stress-driven dislocation processes, as simulated using molecular dynamics (MD). Stochastic analyses of the survival probability are found to lead to simple relationships between the loading history and the distributio…
Micro- and nanostructures were fabricated directly on graphene nanosheets by controlling the conditions of femtosecond laser pulse etching. High quality graphene micro- and nanostructures with a minimum width of 492 nm were obtained as the graphene nanosheets used in our experiments were large-scale, uniform and highl…
An alternative tellurization strategy has been introduced into the construction of thermoelectric Bi 2 Te 3 films by a facile chemical vapor transport process, in which presynthesized bismuth films made by a solution route were used as the platform. The synthesized Bi 2 Te 3 films are highly crystallized with (00 l )…
Structures à la carte: the combination of lone pairs and halide ions yields a praseodymium antimony oxohalide nanocluster [Pr(4)Sb(12)O(18)Cl(17)](5-) with nearly perfect T(d) symmetry. Inorganic-organic hybrid compounds with 1D chain structure and 2D wave layer structure were assembled using dicarboxylic ligands with…
Degradation of 2,4,6-trichlorophenol (TCP) has been investigated using two types of sonochemical reactors viz. ultrasonic horn and ultrasonic bath reactors with an objective of investigating the effect of different operating parameters and intensifying the extent of degradation using different additives. Effect of dif…
A methodology comprising careful consideration of sample preparation, reactor design, experimental procedures, and data evaluation routines for precise analysis of the kinetics of gas–solid reactions, specifically the oxidation of carbonaceous materials, has been developed and validated. The well-controlled solvent-fr…
Morphology development of polytetrafluoroethylene (PTFE) caused by applied flow history in molten isotactic polypropylene (PP) is investigated, employing a cone-and-plate rheometer and a capillary rheometer as mixing devices. Since the flow history is applied at 190 °C, PTFE is in the solid state whereas PP is in the…