Materials Literature
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We derive and discuss expressions for the temperature-dependent electrostatic polarizabilities of off-center ions holding good under various experimental conditions. At low temperatures and electric-field strengths, all of them reasonably reduce to values characteristic of phonon-coupled two-level systems. Prospects f…
Polyhedral gold nanocrystals with decahedral, icosahedral, and truncated tetrahedral shapes are synthesized by a simple one-pot polyol process in the prescence of poly(vinyl pyrrolidone) (PVP). High PVP concentration up to 360 equiv of the gold precursor, HAuCl 4, effectively stabilizes decahedral seeds to yield unifo…
Abstract An intumescent flame retardant, poly(diaminodiphenyl methane spirocyclic pentaerythritol bisphosphonate) (PDSPB) has been covalently grafted onto the surfaces of multiwalled carbon nanotubes (MWNTs) to obtain MWNT‐PDSPB and according nanocomposites were prepared via melt blending. After high density PDSPB (65…
Quantum dots (QDs) are semiconductor nanocrystals that emit fluorescence on excitation with a light source. They have excellent optical properties, including high brightness, resistance to photobleaching and tunable wavelength. Recent developments in surface modification of QDs enable their potential application in ca…
Converging advances in the development of nanoparticle-based imaging probes and improved understanding of the molecular biology of brain tumors offer the potential to provide physicians with new tools for the diagnosis and treatment of these deadly diseases. However, the effectiveness of promising nanoparticle technol…
Carbon nanotubes are promising new materials for molecular delivery in biological systems. The long-term fate of nanotubes intravenously injected into animals in vivo is currently unknown, an issue critical to potential clinical applications of these materials. Here, using the intrinsic Raman spectroscopic signatures…
ADVERTISEMENT RETURN TO ISSUEPREVAdditions and Correc...Additions and CorrectionsEffect of Growth Rate History on Current Crystal Growth. 2. Crystal Growth of Sucrose, Al(SO4)2·12H2O, KH2PO4, and K2SO4Pareena Pantaraks, Masakuni Matsuoka, and Adrian E. FloodCite this: Cryst. Growth Des. 2008, 8, 3, 1078Publication Dat…
Abstract Nonisothermal and isothermal crystallization kinetics of an aromatic thermoplastic polyimide derived from 3,3′,4,4′‐oxydiphthalic dianhydride and 4,4′‐oxydianiline have been investigated by means of differential scanning calorimetry (DSC) and wide‐angle X‐ray diffraction. The results for nonisothermal crystal…
Abstract A lucky‐drift (LD) model for impact ionization has been recently successfully used to account for avalanche phenomenon in amorphous semiconductors. This model however leads to the dependence of the impact ionization coefficient on the sample thickness. However such dependence has not been confirmed experiment…
Abstract The synthesis, optical properties, spin‐polarization path and magnetic ground‐state studies of a novel nitronyl nitroxide biradical system based on the 2,6‐bis(pyrazolylmethyl)pyridine unit is reported. Besides the presence of σ conjugation and a non‐alternant pathway for spin polarization through the core as…
In situ x-ray reflectivity measurements are used to determine the cooling rate dependent freezing of capillary waves on the oligomer poly(propylene glycol). Only above the glass transition temperature ${T}_{\mathrm{G}}$ can the surface roughness $\ensuremath{\sigma}$ be described by the capillary wave model for simple…
The design of any fusion power plant requires information on the irradiation hardening of low-activation ferritic/martensitic steels beyond the range of most present measurements. Neural networks have been used by Kemp et al ( J. Nucl. Mater. 348 311–28) to model the yield stress of some 1811 irradiated alloys. The sa…
Fine (approximately 18 nm) particles of nickel ferrite were synthesized by the sol-gel technique, and their structural properties were evaluated by X-ray diffraction. Neoprene-based rubber ferrite composites were prepared by incorporating these nickel ferrite powders in the rubber matrix according to a specific recipe…
We report on development and characterization of new photoaligning polymers based on cellulose main chain and side fragments based on cinnamic acid containing alkenyl groups. The materials possess excellent photosensitivity, rather strong anchoring energy, low sticking parameter and can be considered as a promising ca…
A study of polymer-acid-modified Red mud composite (PRC) was done using a polymer matrix of poly (vinyl alcohol) (PVA) and layered Red mud as reinforcing agent. Composite materials were prepared by effectively dispersing the PVA matrix into the inorganic layered modified Red mud via a conventional solvent-casting tech…
The possibilities of the use of Eu3+ in extracting information of the pressure effects on the nature of its crystal site in the NH4.Eu(SO4)2 catalytic host are closely inspected through the study of emission spectra for applied pressures up to 87 kbar. The phenomenological crystal field analysis of these spectra revea…
This minireview aims to demonstrate that (i) natural nanotubes play important roles in chemical signaling and (ii) they represent one of the deep functional similarities between neural and immune synapses. We also pay attention to the related receptor assemblies and possibilities of chemically synthesized carbon nanot…
Abstract Polarized Raman and IR spectra of a PbB 4 O 7 single crystal were measured. The obtained spectra are discussed within the factor group approach for the orthorhombic P 2 1 nm ( C 2 v 7 ) space group with Z = 2 assuming that the crystal structure is built up of the (B 4 O 7 ) ∞ 2− framework and Pb 2+ ions. It h…
Abstract Raman spectral mapping of thin organic layers on metal substrates is an important analytical tool to characterize these systems. Surface‐enhanced Raman scattering (SERS) spectroscopy is a suitable technique for analysis of such layers. Development of new SERS‐active surfaces with repeatable properties and wit…
We demonstrated in this study that the electrostatic interaction between nanocrystals (NCs) and polymers was dominant in the photophysical properties of their composites. This effect became more pronounced under illumination and in the presence of the carbazole moieties. The mechanism in which carbazole moieties influ…