Materials Literature
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We report the first observation of band gap chemiluminescence of semiconductor quantum dots in solution and in nanoparticulate layers. The spectral position of the band gap chemiluminescence of CdSe/CdS core shell and InP nanocrystals depends on their particle size, allowing thus an efficient tuning of the emission co…
Two types of isotropic disordered nonergodic states exist in colloidal suspensions: glasses and gels. The difference between the two is that the nonergodicity, or elasticity, of gel stems from the existence of a percolated network, while that of glass stems from caging effects. Despite this clear difference in the ori…
A finite deformation continuum theory is derived from interatomic potentials for the analysis of the mechanics of carbon nanotubes. This nonlinear elastic theory is based on an extension of the Cauchy-Born rule called the exponential Cauchy-Born rule. The continuum object replacing the graphene sheet is a surface with…
Drug delivery systems (DDS) such as lipid- or polymer-based nanoparticles can be designed to improve the pharmacological and therapeutic properties of drugs administered parenterally. Many of the early problems that hindered the clinical applications of particulate DDS have been overcome, with several DDS formulations…
Abstract The formation of complexes between linear poly(acrylic acid) (PAA) and uranyl ions in aqueous solutions was studied with conductometry, potentiometry, thermal analysis, Fourier transform infrared, and luminescence spectroscopy methods. The stoichiometry of the PAA/UO complex on repeating units of a PAA basis…
Abstract The surfaces of the film samples of low‐density polyethylene (LDPE) were chemically modified with an aqueous solution of ammonium persulphate solution (0.1 M ) and Fe (NO 3 ) 3, 9H 2 O (0.2 M ) heated to about 80°C for 2.5 h for which polar groups like OH, 〉CO, COOH, etc., were generated on the surface of t…
The structural phase transitions of Sr 2 Ta 2 O 7 single crystals have been studied by the modulated temperature differential scanning calorimetry (MDSC), Brillouin scattering and dielectric spectroscopy. The specific heat ( C p ) was measured over a wide temperature range from −150°C to 25°C and from 100°C to 210°C.…
Abstract We report a novel porous fluorinated polyimide membrane with a cylinder structure fabricated by a wet phase inversion process, which is formed by a ternary system, polyimide/solvent/water. The porous polyimide membranes consisted of a thin top porous layer and three‐dimensionally ordered cylinder micropores.…
Abstract A series of blends with various compositions was prepared on the basis of polysulfone, polyethersulfone, and polyimide. These blends were characterized by different techniques, including Fourier transform IR spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, and tensile stress–strai…
We present an inelastic x-ray scattering study of the quasi-one-dimensional blue bronze ${\mathrm{Rb}}_{0.3}{\mathrm{MoO}}_{3}.$ The charge-density-wave (CDW) dynamics is studied as a function of the temperature down to 40 K. At temperature higher than 100 K, the CDW-phase and -amplitude modes are identified, and foun…
Dynamic compressive stress-strain curves for ethylene-propylene-diene monomer (EPDM) rubber at various strain rates under nearly uniaxial strain conditions have been determined with a pulse-shaped split Hopkinson pressure bar (SHPB). The resultant stress-strain curves exhibited significantly nonlinear behavior, with s…
Abstract Waste poly(ethylene terephthalate) (PET) bottles were glycolyzed by propylene glycol (PG) at a weight ratio of PET to PG of 37.5 : 62.5 using zinc acetate as a catalyst. The glycolyzed product, consisting of oligomeric diols with a number‐average molecular weight range of 458–844, was obtained. It was further…
The radial electromechanical properties of carbon nanotubes have been measured. The electrical conductance of single‐walled carbon nanotubes (SWNTs) as a function of the loading force and bias voltage applied by an atomic force microscope tip is reported (see Figure). An increase of the conductance due to the tip–SWNT…
Abstract High‐density polyethylene (HDPE) sample tanks manufactured by using a rotational molding process were used in a study to determine the presence and characteristics of antioxidants at the inside and outside surfaces of the tanks. The sample tanks were manufactured by using three different processing times to c…
We report experimental results at 1.057 GHz that demonstrate the ability of a planar left-handed lens, with a relative refractive index of -1, to form images that overcome the diffraction limit. The left-handed lens is a planar slab consisting of a grid of printed metallic strips over a ground plane, loaded with serie…
Results are reviewed from a study examining the influences of concentration and molecular weight of poly(acrylic acid) sodium salt on the inhibition of CaCO 3 formation in solutions similar in ion composition and pH to those used in wood pulping operations. Calcium concentrations and temperatures were monitored in hea…
The electro-optic properties of a vertically aligned liquid crystal device with a three-electrode structure for fast response applications have been studied. The fast response is realized by a three-electrode structure that can produce an electric field horizontally and vertically, alternately to turn the liquid cryst…
Atomic layer epitaxy (ALE) of ZnO on a GaN template was performed in a low-pressure gas flow system using ZnCl 2 and O 2 precursors, and the evidence of monocrystallinity of an ALE-grown ZnO film is presented. The growth is achieved under the pressure of about 5 mbar with 480 °C substrate temperature and the ZnCl 2 -s…
A low‐temperature, low‐pressure polymer bonding technique for three‐dimensional assembly of microstructures (see Figure; scale bar 5 μm) based on carbon dioxide (CO 2 )‐enhanced chain entanglement near the polymer surfaces is presented. The environmentally benign utilization of supercritical CO 2 offers scope for the…
Thin films consisting of perovskite ferromagnetic nanorod (La,Sr)MnO 3 with highly epitaxial quality and well-defined nanorod separation have been synthesized with pulsed laser processing. Each nanorod has an in-plane dimension of about 20−30 nm and length equal to the thin film thickness that can vary from tens to hu…