Materials Literature
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A novel approach to the recycling of polystyrene is reported here; polystyrene is converted to a biodegradable plastic, namely polyhydroxyalkanoate (PHA). This unique combinatorial approach involves the pyrolysis of polystyrene to styrene oil, followed by the bacterial conversion of the styrene oil to PHA by Pseudomon…
Motivated by the successful synthesis of several molecular quantum spin rings we are investigating whether such systems can host magnetic solitary waves. The small size of these spin systems forbids the application of a classical or continuum limit. We therefore investigate whether the time-dependent Schroedinger equa…
Hole spin dephasing time due to the D'yakonov-Perel' mechanism in $p$-type GaAs (100) quantum wells with well separated light-hole and heavy-hole bands is studied by constructing and numerically solving the kinetic spin Bloch equations. We include all the spin-conserving scattering such as the hole-phonon and the hole…
A new method to PEGylate magnetic nanoparticles with a dense layer of poly(poly(ethylene glycol) monomethacrylate) (P(PEGMA)) by surface-initiated atom transfer radical polymerization (ATRP) is reported. In this approach, an initiator for ATRP was first immobilized onto the magnetic nanoparticle surface, and then P(PE…
The growth dynamics of a single-walled carbon nanotube (SWNT) is observed in real-time using an in situ ultrahigh vacuum transmission electron microscope at 650 degrees C. SWNTs preferentially grow on smaller sized catalyst particles (diameter <or= 6 nm) with three distinct growth regimes (incubation, growth, and pass…
OBJECTIVES: This report presents an overview of preclinical data available on ferumoxtran-10, an ultrasmall superparamagnetic iron oxide nanoparticular contrast agent proposed for lymph node magnetic resonance imaging. MATERIALS AND METHODS: Pharmacokinetic, safety pharmacology, single- and repeat-dose toxicity, repro…
Poor solubility and hydrophobicity of drugs/bioactives limit their possible applications in drug delivery and formulation development. Apart from conventional methods of solubility enhancement, there are some novel methods which can be used in solubilization. Dendrimers represent a novel type of polymeric material tha…
OBJECTIVES: We sought to determine the relaxivity and accurate relaxation rates of Gd-DTPA, Gd-BT-DO3A, and Gd-BOPTA at 0.2, 1.5, and 3 T in human blood plasma. MATERIALS AND METHODS: Contrast media concentrations between 0.01 and 16 mM in human plasma were used for relaxation measurements. The R1 and R2 relaxation ra…
It was recently observed that the ferroelectrics showing the strongest sensitivity to an applied magnetic field are spiral magnets. We present a phenomenological theory of inhomogeneous ferroelectric magnets, which describes their thermodynamics and magnetic field behavior, e.g., dielectric susceptibility anomalies at…
An improved description of Jones vectors of the electric fields of incident and refracted rays in a tilted birefringent plate were derived. The incident and refracted electric fields were both expressed as linear combinations of ordinary (O) and extraordinary (E) components. For the O polarization inside the plate, it…
A spiral carbon nanofiber of 30 to 40 nm diam and 20 µm average lengths has been synthesized by catalyst chemical vapor deposition method using Ni or Fe‐Ni alloy as catalyst. The purpose of synthesis of carbon nano fibers was to use it for hydrogen adsorption. Catalysts used affected the morphology of carbon nano mate…
An integrated approach, involving the use of a number of analytical techniques, was used to study polymer coating network development during photopolymerization of a series of fast reacting, low modulus coating formulations containing urethane/acrylate oligomers and acrylic comonomers. Real-time UV rheology measuremen…
ZnS nanoparticles and nanorods were synthesized by a solvothermal process. The particle sizes of the ZnS nanostructures were varied within 2–8 nm. The diameter of the ZnS nanorods varied within 12–15 nm and their length varied within 100–200 nm. Solvent played an important role in determining the morphology of the ZnS…
We studied the carbonization mechanism of tetrapropylammonium-hydroxide (TPAOH) carbon precursors in the channels of AlPO 4 -5 crystal, with the aim of producing higher-density and better-quality 4 Å carbon nanotubes. The conversion process of TPAOH was investigated by using a combination of Fourier transform infrared…
Abstract 2‐Oxo‐12‐crown‐4‐ether (OC) was procured in a novel, two‐step procedure in a 37% overall yield. This interesting hydrophilic lactone was effectively polymerized with Novozym 435 as the catalyst: within 10 min, the monomer conversion was greater than 95%. Poly(2‐oxo‐12‐crown‐4‐ether) [poly(OC)] was obtained as…
We employ experiment and theory to explore the nonlinear elasticity and yielding of concentrated suspensions of nanoparticles which interact via purely repulsive forces. These glassy suspensions are found to exhibit high exponent power law or simple exponential dependences of the shear elastic modulus and perturbative…
Banana fibers obtained from the sheath of the banana plant (Musa Sapientum) whose major constituent is cellulose were modified using various chemical agents in order to improve their compatibility with the polymer matrix. The change in the surface composition of the raw and chemically modified fiber was investigated u…
We show numeric evidence that, at low enough temperatures, the potential energy density of a glass-forming liquid fluctuates over length scales much larger than the interaction range. We focus on the behavior of translationally invariant quantities. The growing correlation length is unveiled by studying the finite-siz…
The water vapor permeability of fat barrier films has been associated with structural characteristics such as polymorphism, crystal size, and chemical composition, among others. However, no mechanistic models have been proposed to describe this relationship. In this study, we have determined the effects of processing…
The structural properties of La 1 - x Ca x MnO 3 are investigated by employing bulk and surface simulation techniques. The potential parameters reproduce the crystal structures of both end compositions, giving good agreement with experimental data. The calculated variation of the lattice parameters with Ca concentrati…