Materials Literature
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Composites with compositions ( x )Ni 0.8 Cu 0.2 Fe 2 O 4 + (1 − x )Ba 0.9 Pb 0.1 Ti 0.9 Zr 0.1 O 3 , in which x varies as 0, 0.15, 0.30, 0.45 and 1 mol%, were prepared by a standard ceramic technique. X-ray diffraction was used to carry out the structural analysis. The microstructural analysis was carried out by scann…
Abstract Combined in situ rheo‐SAXS (small‐angle X‐ray scattering) and ‐WAXD (wide‐angle X‐ray diffraction) studies using couette flow geometry were carried out to probe thermal stabilty of shear‐induced oriented precursor structure in isotactic polypropylene (iPP) at around its normal melting point (162 °C). Although…
We suggest that additional depression of the phonon conductivity $\ensuremath{\kappa}$ at its peak value due to plastic deformation of close-packed structures might well be caused by phonon scattering by stacking faults and the dislocation cores. These two scattering processes would give rise to respectively ${\ensure…
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Abstract Poly( L ‐lactic acid) (PLLA), poly(ε‐caprolactone) (PCL), and their films without or blended with 50 wt% poly(ethylene glycol) (PEG) were prepared by solution casting. Porous films were obtained by water‐extraction of PEG from solution‐cast phase‐separated PLLA‐ blend ‐PCL‐ blend ‐PEG films. The effects of PL…
The preparation of 2,7-linked carbazole polymers with 4-dialkylamino-phenyl substituents is presented. Poly(9-(4-dioctylamino-phenyl)-9 H -carbazole-2,7-diyl) P 1 and poly(3,6-dimethyl-9-(4-dioctylamino-phenyl)-9 H -carbazole- alt -9-(4-dioctylamino-phenyl)-9 H -carbazole-2,7-diyl) P 2 were prepared through a Suzuki c…
This study concerns the design of protein-resistant polymer adsorbed layers for the control of surface binding of biospecific recognition entities. Polymer surface layers were prepared using the adsorption of poly(allylamine hydrochloride) (PAH), poly(l-lysine) (PL), and branched and linear polyethyleneimine (PEI) and…
Methoxypoly(ethylene glycol)-oligo(aspartic acid) (MPEG-Asp(n)-NH(2), n = 2-5) hybrid block copolymers were synthesized and used as stabilizers to prepare superparamagnetic Fe(3)O(4) nanoparticles with magnetite as the inner core and and poly(ethylene glycol) as the hydrophilic outer shell. The aqueous dispersions of…
The effects of CaCl 2 and sucrose on the hydration of monoclinic and triclinic tricalcium silicate were studied using quasielastic neutron scattering and calorimetry. Aside from acceleration and retardation, other effects on the reaction were revealed including changes to the rate constant and the type and amount of h…
We have investigated the electrical resistivity, magnetotransport, and heat capacity in several compounds of the type ${M}_{n+1}A{C}_{n}$. The temperature dependence of the electrical resistivity and the electronic contribution to the heat capacity of this family of materials are strongly influenced by electron-phonon…
Dynamical four-point susceptibilities measure the extent of spatial correlations in the dynamics of glass forming systems. We show how these susceptibilities depend on the lengthscales that necessarily form part of their definition. The behavior of these susceptibilities is estimated by means of an analysis in terms o…
We studied the kinetics of sublimating crystals with single-particle resolution by experiments with colloidal spheres and by computer simulations. A short-range attraction between spheres led to crystallites one to three layers thick. The spheres were tracked with optical microscopy while the attraction was reduced an…
Pouring in: The picture shows an STEM image of 7-nm Au-InAs metal–semiconductor hybrid nanoparticles where a gold core (yellow) is surrounded by an amorphous InAs shell (pink). These nanoparticles form by diffusion of Au into InAs particles.
We report the sub-picosecond photoconductivity dynamics of chemically treated PbSe nanocrystal arrays utilizing time-resolved terahertz spectroscopy (TRTS). TRTS allows both the degree of interdot electronic coupling and the carrier dynamics to be extracted simultaneously. The following capping ligands bonded to the q…
We report a method to controllably alter the diameter of an individual carbon nanotube. The combination of defect formation via electron irradiation and simultaneous resistive heating and electromigration in vacuum causes the nanotube to continuously transform into a high-quality nanotube of successively smaller diame…
The electronic structure of $\mathrm{NiO}$ nanometric planar islands on highly oriented pyrolitic graphite has been studied by means of the $\mathrm{Ni}\phantom{\rule{0.3em}{0ex}}2p$ and $\mathrm{O}\phantom{\rule{0.3em}{0ex}}1s$ x-ray absorption spectra. The $\mathrm{O}\phantom{\rule{0.3em}{0ex}}1s$ spectrum of the ea…
We report on electrical Raman measurements in transparent and conducting single-wall carbon nanotube (SWNT) thin films. Application of external electric field results in downshifts of the D and G modes and in reduction of their intensity. The intensities of the radial breathing modes increase with electric field in me…
We have generated and detected coherent lattice vibrations in single-walled carbon nanotubes corresponding to the radial breathing mode (RBM) using ultrashort laser pulses. Because the band gap is a function of diameter, these RBM-induced diameter oscillations cause ultrafast band gap oscillations, thereby modulating…
Abstract The absolute heat capacity and glass transition temperature ( T g ) of unsupported ultrathin films were measured with differential scanning calorimetry with the step‐scan method in an effort to further examine the thermodynamic behavior of glass‐forming materials on the nanoscale. Films were stacked in layers…
A general approach to modifying preformed dendrimer-entrapped Au nanoparticles with different functionalities is proved to improve their biocompatibility.