Materials Literature
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Assemblies comprising anion complexes of π-extended oligopyrrole derivatives and counter cations, as well as those of anion-free receptor molecules, exhibited the formation of mesophases based on columnar structures using electrostatic and π-π interactions.
PbF2 nanocrystals found to be a better host for Dy3+ ions to exhibit better quantum efficiency. The optimum dopant concentration is found to be higher than that observed in several bulk materials. The nanocrystals are rendered water dispersible by coating poly(acrylic acid) over their surface.
This work presents the electrochemical results obtained during the study of the corrosion of X70 pipeline steel samples immersed in a 3 % wt NaCl solution saturated with CO2 at 20ºC under static and controlled turbulent flow conditions. In order to control the hydrodynamic conditions of the system, a rotating cylinder…
The tensile strength behavior and recyclability of the paper prepared with the addition of polyamideamine-epichlorohydrin (PAE) were investigated. The dry and wet tensile strengths obtained with different PAE dosage were measured. The highest wet-to-dry strength ratio of 35% was obtained at 10 mg/g; above this additio…
An effective and versatile technique was implemented for the synthesis of silver nanoparticles using the ethanolic extract of leaves of Pisonia grandis (R. Br). The silver nanoparticles were synthesized by three different methods and the completion of the reaction was monitored with UV-visible spectrophotometer. The X…
INTRODUCTION: Diatoms are single cell eukaryotic microalgae, which present in nearly every water habitat make them ideal tools for a wide range of applications such as oil explora-tion, forensic examination, environmental indication, biosilica pattern generation, toxicity testing and eutrophication of aqueous ecosyste…
Recent advances in our understanding of the emergence of biomineral phases from solution has provoked new and challenging questions. A consensus is beginning to form, attesting to the existence of pre-nucleation clusters of calcium carbonate in solution, which subsequently aggregate to initiate solid growth. The struc…
Nanotechnology is still a new science, but already fully developed and increasingly used in everyday life. Cellulose is a polymer of low cost and is also hydrophilic, chiral and can be easily subject to chemical modifications. Moreover, cellulosic material is biodegradable and socially acceptable. All these features m…
The catalytic oxidation of carbon black, a model soot, over Ag/ZrO2 was studied. Transmission electron microscopy observations revealed that Ag nanoparticles with sizes of 2–10 nm on the catalysts presented 3–10 wt% Ag loading. Temperature-programmed reaction and transient activity measurements of carbon black oxidati…
Novel collapsed kippah-like mesoporous silica nanoparticles were synthesized using an O/W microemulsion system. The oil (hexadecane) can escape from the core while water could not enter through the surfactant filled nanopores of the soft shell during synthesis.
A series of triarylcyclopentadiene derivatives were synthesized and their crystal structures and photoluminescence properties in solution and aggregation state were studied. Their maximum fluorescence emission wavelengths were 452–483 nm. Four of them have weak emission in solution but intense emission when aggregated…
The design of fluorescent probes for turn-on sensing of anions has been especially significant because it can effectively enhance sensing sensitivity by decreasing the background interference. In the present work, we have systematically studied the potential applications of fluorescent quantum dots (QDs) in turn-on an…
We herein report two different methods to deposit metallic and semiconducting nanoparticles inside a conducting polymer (CP) by controlling the diffusion of an active ion within the film. The first method is a pulsed electrodeposition where the ‘off’ intervals allow the ions to flow into the CPs as they re-oxidize. Th…
This paper describes a previously unreported class of sterically crowded tetracene derivatives that have both phenyl and ethynyl substituents. The steric crowding above and below the tetracene core prevents overlap between the extended π-systems of the acenes. Substituent effects cause these tetra-substituted tetracen…
Through-silicon vias (TSV) will speed up interconnections between chips. Manufacturable and cost-effective TSVs will allow faster computer systems. In this paper, we report the successful formation of seed layers for plating copper TSVs with aspect ratios greater than 25:1. Following the rapid atomic layer deposition…
A white powder of oxonitridosilicate Ca3Si2O4N2 was synthesized at 1450 °C from CaCO3, Si3N4 and SiO2. The crystal structure was refined using X-ray and neutron powder diffraction data with subsequent Rietveld refinements (Rwp = 7.35 for XRD and Rwp = 5.53 for NPD). The phase has a cubic unit cell with space group Pa…
TiO2 (anatase) nanocrystals were prepared and their surface was modified by sol–gel deposition of vanadium oxide species. The resulting surface-modified TiO2 combines the good properties of both materials and new, synergistic properties arise, resulting in an increased electrical conductivity, voltage window, specific…
Studies on the self-assembly of metal nanoparticles (NPs) in the presence of ions are motivated by the biosensing applications of NP clusters and the capability to control the morphology of clusters of oppositely charged NPs. The effect of ions has been explored for the self-assembly of metal NPs capped solely with io…
Plasma polymerization was used to produce novel nanometric coatings able to direct fibronectin adsorption and cell response. Using ethyl acrylate as a monomer, we obtain coatings whose chemical composition maintains some of the characteristic functionalities of the photo-initiated polymer, while the water contact angl…
This work reports the direct growth of hollow one-dimensional nanostructure arrays on conducting substrates for use as efficient electrodes in Li-ion batteries. The C-coated hollow SnO2 pillar array structures can be prepared by template-directed synthesis, selective wet etching, and a carbonization route. The well-or…