Materials Literature
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Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
CO adsorption properties on gold clusters were studied by infrared reflection absorption spectroscopy (IRAS) and temperature-programmed desorption (TPD). Two growth procedures that differ in the final gold clusters morphology were compared. In the first, the clusters were prepared by direct deposition (DD) of gold ato…
We present simple CAS-DFT approaches for degenerate and nearly degenerate systems. In this method, we do not employ any auxiliary variables, but employ the effective CASCI-DFT and CASSCF-DFT equations for the ground and excited states. Simple applications for fundamental systems such as atomic multiplet states (C, N+n…
We have successfully aligned single-walled carbon nanotubes (SWNTs) in patterns with nanoscale width, micron-scale length and controllable pitch on SiO 2 /Si substrates using a poly(dimethysiloxane) (PDMS) microchannel mold. The microchanneled mold was patterned with a funnel-shaped channel to minimize nanotube jammin…
Density functional theory optimizations with GGA functionals that include an empirical correction term for the dispersion energy (denoted as -D) have been performed for the van der Waals dimer of porphine. Interaction energies also have been obtained with a recently developed double-hybrid functional (B2-PLYP-D) and a…
High Resolution Image Download MS PowerPoint Slide We propose and demonstrate the concept that a polymer−micelle complex can be used as an aid to preparing nanofibers from aqueous solutions by the electrospinning process. This is based on the recognition that a polymer−micelle complex can simultaneously contribute to…
Colloidal particles are widely used both in fundamental research and in materials science. One important parameter influencing the physical properties of colloidal materials is the particle size distribution (polydispersity) of the colloidal particles. Recent work on colloidal crystallization has demonstrated that eve…
Nanocrystallized boehmite γ - AlOOH· n H 2 O had been synthesized by spray-drying (SD) of a solution of aluminium tri- sec -butoxide peptized by nitric acid. The sub-micronic spherical particles obtained had an average diameter of 500 nm and were built of 100 nm or less platelet-like sub-particles. The average crystal…
Zinc oxide (ZnO) nanorods were synthesized using a simple and economic aqueous solution method on ZnO coated p-type Si substrates. Their physical properties have been examined using appropriate techniques. These investigations showed that the as-grown ZnO nanorods on ZnO/Si are single crystalline and grown along the […
The solid-state reaction between LiNH2 and LiH potentially offers an effective route for hydrogen storage if it can be tailored to meet all the requirements for practical applications. To date, there still exists large uncertainty on the mechanism of the reaction--whether it is mediated by a transient NH3 or directly…
Abstract Rheological properties in a molten state are studied extensively for poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate), PHB‐HV, with a small amount of crosslinked poly(epichlorohydrin), PECH, having low density of crosslink points. It is found that adding 2 wt % of xPECH greatly enhances the melt elasticity of P…
We demonstrate a generic approach for producing different shaped and sized protrusive features using shape-memory polymer (SMP). Utilizing the large recoverable strain in the SMP, and depending on the pre-straining of the SMP, shape of the indenter, temperature during indenting and the depth of polishing, we show that…
Many strongly correlated materials display quadrupolar (Jahn-Teller) distortion of the local octahedral structural units. It is common for these distortions to be observed by probes of local structure but absent in the crystallographic average structure. The ordering of these quadrupoles is important in determining th…
Abstract The interactions between Poly(vinyl chloride) (PVC) and Plasticizers, responsible for polymer plasticization, can be detected by means of Fourier transform infrared spectroscopy (FTIR). The interaction capacity between the two components depends on plasticizer chemical nature, PVC stereoregularity, and plasti…
In this paper, shape memory alloy (SMA) wire actuators are used to control the flap movement of a model airplane wing. Conventionally, the flap of an aircraft wing is driven by electric motors or hydraulic actuators. The use of SMA actuators has the advantage of significant weight reduction. Two SMA actuators are used…
Microstructures built into the surfaces of an optic or window, are an effective replacement for thin-film coatings in anti-reflection (AR) and narrow-band filter applications. AR microstructures exhibit particularly noteworthy performance where an average reflection loss of less than 0.2% over a four-octave range (400…
The spin crossover phenomenon of the recently described spin crossover complex [FeII(DAPP)(abpt)](ClO4)2 [DAPP = bis(3-aminopropyl)(2-pyridylmethyl)amine, abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole] accompanying an order-disorder phase transition of the ligand was investigated by adiabatic heat capacity calor…
Layered double hydroxides (LDHs) have generated a large amount of interest in recent years because of their ability to intercalate a multitude of anionic species. Atomistic simulation techniques such as molecular dynamics have provided considerable insight into the behavior of these materials. The advent of supercompu…
Despite decades of study, the mechanism by which orotidine-5'-monophosphate decarboxylase (ODCase) catalyzes the decarboxylation of orotidine monophosphate remains unresolved. A computational investigation of the direct decarboxylation mechanism has been performed using mixed quantum mechanical/molecular mechanical (Q…
Pb(Mg 1/3 Nb 2/3 )O 3 –PbZrO 3 –PbTiO 3 (PMN–PZT) ferroelectric single crystals near morphotropic phase boundary compositions were fabricated by solid‐state crystal growth. The Curie temperatures ( T C ) of the grown PMN–PZT crystals were found to be on the order of 210°C, with ferroelectric phase transition temperatu…