Materials Literature
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Fe, Fe 3 C and NdC 2 nanoparticles, encapsulated within carbon cages, were continuously produced during the induction thermal plasma processing of Fe 14 Nd 2 B, in the presence of methane or acetylene. The product morphology was studied by means of SEM. Further structural details were obtained from TEM, HRTEM, Raman s…
Application of polyelectrolyte multilayer (PEM) capsules as vehicles for the controlled delivery of substances, such as drugs, genes, pesticides, cosmetics, and foodstuffs, requires a sound understanding of the permeability of the capsules. We report the results of a detailed investigation into probing capsule permeab…
A series of novel highly luminescent bulky oligo(phenylenevinylene)s (MTCD−OPV, BTCD−OPV, and MEH−OPV), bulky π-conjugated poly( p -phenylenevinylene)s (MTCD−PPV, BTCD−PPV), and symmetrically or unsymmetrically substituted bulky random PPV copolymers (BTCD- x and MTCD- x series, where x = 0−100 mol %) bearing tricylod…
We present an ab initio study of the structural and electronic properties of type-I and type-II silicon clathrates doped by elements chosen to be more electronegative than silicon. Depending on the intercalated element, we show that the electronic properties of doped silicon clathrates can exhibit metallic, semiconduc…
Four isomers formed by a gold atom attached to a pentacene molecule were investigated by density functional theory due to their potential applications in molecular electronics. The aim of our study is to shed light on the bonding nature and interaction between gold and carbon, to estimate the influence of gold atoms o…
Although carbon nanotubes (CNTs) with a variety of morphologies have been successfully synthesized, there is no clear physical picture of the growth process. Correspondingly, the growth mechanism is still not clear up to now. Here we suggest a VLS model for the growth process of CNTs, which involves a liquid or liquid…
Abstract The syntheses and characterization of metal‐free and metal‐containing (Zn and Ni) derivatives of a symmetrically octa‐substituted phthalocyanine derived from 4,5:12,13‐bis(4′‐ tert ‐butylbenzo)‐8,9‐(4″,5″‐dicyanobenzo)‐6,11‐ditosyl‐6,11‐diaza‐2,15‐dithiacyclohexadeca‐4,8,12‐triene and CuPc from 4,5:12,13‐bis(…
The hot disc method is a transient plane source method used for the estimation of the thermal conductivity and diffusivity of solid materials. A complete model based on the thermal quadrupoles formalism has been developed to represent the hot disc temperature variation. This model takes into account both the thermal c…
The present contribution reports, for the first time, the mechanical and electro-rheological properties of electrospun poly(vinyl alcohol) (PVA) nanofibre mats with or without the incorporation of carbon black (CB) nanoparticles. The effects of sonication and the addition of CB on morphological appearance, average dia…
Single-walled carbon nanotube (SWNT) multilayer thin films are deposited on silicon substrates with layer-by-layer self-assembly. The structural, mechanical, electrical, and thermal properties of the thin films are investigated using quartz crystal microbalance (QCM), nanoindentation, and rapid thermal annealing techn…
Silicon/silicon oxide interfaces are found to possess magnetic properties when the surface is etched to a specific morphology. By measuring the surface roughness (see figure) using atomic force microscopy, and monitoring the magnetic response as a function of magnetic field, the relation between the magnetism and the…
The mechanism of generation of volatile metal/metalloid hydrides by derivatization with borane complexes is presented. This reaction has been employed for ultratrace element analysis since 1972 and has been the source of much controversy in regard to the reaction mechanism. Here we investigated this derivatization by…
We have previously demonstrated the feasibility of blending bioerodible polyphosphazenes with poly(lactide-co-glycolide) (PLGA) to form versatile polymeric materials with altered bioerosion properties. These studies demonstrated the effective neutralization of the acidic degradation products of PLGA by the polyphospha…
We describe a model for the thermodynamics and dynamics of glass-forming liquids in terms of excitations from an ideal glass state to a Gaussian manifold of configurationally excited states. The quantitative fit of this three parameter model to the experimental data on excess entropy and heat capacity shows that "frag…
Vertically oriented CuS nanowalls supported on a copper substrate have been synthesized through a facile method involving an inorganic vapour–solid phase reaction. The CuS nanowalls were well connected to form an extended network. The shapes of the CuS nanostructures could be controlled by adjusting the reaction condi…
The anisotropic thermal diffusivity of aligned carbon nanotube-polymer composites was determined using a photothermoelectric technique. The composites were obtained by infiltrating poly-dimethyl siloxane (PDMS) in aligned multiwall CNT arrays grown by chemical vapor deposition on silicon substrates. The thermal diffus…
This report describes the rapid and slow thermal decomposition of an energetically unstable polycyclic and heterocyclic azide, triazido-s-heptazine (C6N16), to produce nitrogen-rich CNx materials (x > 1.2). An analysis of gaseous byproducts shows that this large heterocyclic precursor releases primarily N2 gas during…
Abstract We report the first instance of facile synthesis of dumbbell‐shaped dendritic‐linear‐dendritic triblock copolymer, [G‐3]‐PNIPAM‐[G‐3], consisting of third generation poly(benzyl ether) monodendrons ([G‐3]) and linear poly( N ‐isopropylacrylamide) (PNIPAM), via reversible addition‐fragmentation chain transfer…
We have carried out a detailed evaluation of the performance of all classes of density functional theory (DFT) for describing the potential energy surface (PES) of a wide range of nucleophilic substitution (SN2) reactions involving, amongst others, nucleophilic attack at carbon, nitrogen, silicon, and sulfur. In parti…
A breath of fresh air: Mesoporous manganese oxide (γ-MnO2) was deposited with gold nanoparticles by vacuum-UV-assisted laser ablation, resulting in very strong metal–support interactions. The composite was found to remove a wide range of volatile organic compounds (and NOx and SO2) from air as well as catalyze their d…