Materials Literature
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Abstract The strength properties of polypropylene fibers were enhanced with single‐wall carbon nanotubes (SWNTs). Solvent processing was used to disperse SWNTs in a commodity polypropylene. After the solvent was removed, the solid polymer was melt‐spun and postdrawn into fibers of unusual strength. For a 1‐wt % loadin…
Cell targeting with magnetic nanoparticles raises a growing interest in the fields of both cellular biology and medical imaging. We have investigated the nonspecific interactions of superparamagnetic negatively charged iron oxide nanoparticles with HeLa tumor cells and mouse RAW macrophages, qualitatively by electron…
We report on structural, magnetic, and electrical properties of Sr-doped ${\mathrm{LaMnO}}_{3}$ single crystals for doping levels $0.4<~x<~0.85.$ The complex structural and magnetic phase diagram can only be explained assuming significant contributions from the orbital degrees of freedom. Close to $x=0.6$ a ferr…
By decomposing Zn(OH) 4 2 - or Zn(NH 3 ) 4 2+ precursor in various solvents at suitable reaction conditions, zinc oxide with a diversity of well-defined morphologies was synthesized. Flowerlike ZnO built up by nanorods was obtained by treating Zn(OH) 4 2 - precursor in water at 180 °C for 13 h. Whereas a replacement o…
The present work reports electrochemical synthesis of a semi-IPN (s-IPN) following electropolymerization of pyrrole from an aqueous medium within a crosslinked network of PVA. This combination resulted in a set of free standing and flexible films having high electrical conductivity and good environmental stability. Pr…
The photophysics of PAMAM (poly-amidoamine) based dendrimers (generations G0-G4) modified with (4, 8, 16, 32, and 64) pendant-[Ru(tpy) 2 ] +2 (tpy is 2,2‘:6‘,2‘ ‘-terpyridine) and [Ru(bpy) 3 ] +2 (bpy is 2,2‘-bipyridine) chromophores have been studied in both fluid solution at 298 K and frozen glasses, at 77 K. The ab…
We analyze through molecular dynamics simulations of a Lennard-Jones (LJ) binary mixture the statistics of the distances between inherent structures sampled at temperatures above the mode coupling transition temperature T(MCT). After equilibrating at T>T(MCT) we take equilibrated configurations and randomly perturb th…
Recently, many ways (sometimes inspired by nature) for achieving super-hydrophobic surfaces have been proposed in the literature. On such surfaces, water makes a contact angle close to 180°, which produces spectacular properties: droplets do not stick and the surfaces repel water, which bounces when thrown on them. He…
The thermal vapor transport of nitrogen-rich carbon nitride powders produces carbon nitride films on substrates that retain significant nitrogen content, have conjugated bond character, and show blue photoluminescent emission near 450 nm.
We propose that anisotropic p-, d-, or f-wave pairing symmetries can be distinguished from a tunneling spectroscopy in the presence of magnetic fields, which is exemplified here for a model organic superconductor ${(\mathrm{TMTSF})}_{2}X.$ The shape of the Fermi surface (quasi-one-dimensional in this example) affects…
Ferromagnetic and transport properties of ${\mathrm{La}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.78}{\mathrm{Ca}}_{0.22}{\mathrm{MnO}}_{3}$ single crystals were studied in temperature range $4.2\mathrm{K}<T<300\mathrm{K}$ and under hydrostatic pressure up to 12 kbar. It was found that t…
The multidentate ligands tris[(N'-tert-butylureayl)-N-ethyl)]amine (H(6)1) and 1-(tert-butylaminocarbonyl)-2,2-dimethylaminoethane (H(2)2) have been used to investigate the assembly and properties of complexes with Cu(1.5)Cu(1.5) units. The complexes [Cu(H(5)1)](2)(+) and [Cu(H2)](2)(+) have been isolated and structur…
ZONES is a relational database built from NIST Crystal Data for the identification of single crystals by selected area electron diffraction (SAED) and elemental analysis using Microsoft Access 97 for the personal computer (subsequently converted to Access 2000 ). The two largest experimental d spacings and included an…
Abstract The phenomenon of enthalpic relaxation was evaluated for poly(lactide‐ co ‐glycolide) (PLGA, 50:50), in terms of storage of nanospheres for use as a controlled drug delivery system. Samples were stored for different times and temperatures below the glass transition temperature ( T g ). Relaxation occurred at…
Abstract Changes in the fast dynamics of polybutadiene (PB) with molecular weight and molecular architecture have been investigated by light and neutron scattering spectroscopy. Differences observed in the fast dynamics of various molecules correlate with differences seen in the value of the glass‐transition temperatu…
Crystalline phases of monoglyme:NaCF 3 SO 3, diglyme:NaCF 3 SO 3, and tetraglyme:NaCF 3 SO 3 have been characterized by DSC, X-ray diffraction, and vibrational spectroscopy. Comparison of the structures allows for the investigation of the effect of the number of ethylene oxide units on local structure in these systems…
The bimetallic trinuclear complexes, [{(tpa)Cu(NC)}2Fe(CN)4]ClO4·6H2O (1), [{(tren)Cu(NC)}2Fe(CN)4]ClO4·4H2O (2), [{Cu(tpa)NC}2Cr(CN)4]ClO4·8H2O (3) and [{Cu([15]aneN4)NC}2Cr(CN)4]ClO4·4H2O (4) [tpa = tris(2-pyridylmethyl)amine, tren = tris(2-aminoethyl)amine, ([15]aneN4 = 1,5,9,12-tetraazacyclopentadecane] were prepa…
The problem of asymmetric X-ray diffraction peak broadening caused by dislocations is investigated. The leading term responsible for the asymmetry of the intensity distribution is calculated for randomly distributed polarized dipoles and dipole walls. It is found that the polarization structure of a dislocation ensemb…
Aggregation kinetics and cluster-size distributions are studied with off-lattice, diffusion-limited cluster-cluster simulations. With increased cluster crowding (occurring at late times) as measured by the normalized free volume, Omega, both the kinetics speeds up and the size distribution broadens. The exponents char…
A high-resolution X-ray diffractometer devoted to the study of imperfect materials (mainly oxides and ceramics) is presented. It is based on a rotating anode generator, a four-bounce monochromator, a five-movement sample holder and a curved position-sensitive detector (PSD). This setup allows rapid acquisition of a re…