Materials Literature
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Abstract The dielectric properties of lanthanum (La) and titanium (Ti) modified SBN ceramics were investigated in this work. The ferroelectric to paraelectric transition temperature is found to be sensitive to the substitution degree of host ions. In particular, high values of permittivity at room temperature and a st…
The intrinsic linewidth of Ag(100) electronic image-potential states versus the momentum parallel to the surface has been obtained from line-shape analysis of high-resolution angle-resolved two-photon photoemission spectra. For the $n=1$ state, the measured intrinsic linewidths have been observed to increase from 14 m…
The anharmonic decay rates of atomic vibrations in amorphous silicon $(a$-Si) and paracrystalline silicon $(p$-Si), containing small crystalline grains embedded in a disordered matrix, are calculated using realistic structural models. The models are 1000-atom four-coordinated networks relaxed to a local minimum of the…
ADVERTISEMENT RETURN TO ISSUEPREVNoteSynthesis and Thermal Properties of Hydrogenated Poly(styrene-co-1,1-diphenylethylene) CopolymersJing J. Xu and Frank S. BatesView Author Information Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 Cite this: Macromole…
Abstract Microhardness tests, Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC) measurements were performed on melt‐pressed films of multicomponent blends based on low‐density polyethylene (LDPE), linear LDPE (LLDPE), high‐density polyethylene (HDPE), and polypropylene (PP), a…
In this Letter, crystal growth of a symmetric crystalline−amorphous diblock copolymer, poly(styrene- b -ε-caprolactone) (PS- b -PCL), in thin films was investigated by atomic force microscopy (AFM). Relief structures of holes and islands were formed during annealing the film at the molten state, and the in situ observ…
A novel tubular form of graphitic boron nitride (BN) displaying a hollow conical-helix was discovered. It was generated via wrapping a single beltlike filament according to the geometry of an Archimedes spiral. Cone apex angles of helical-conical nanotubes (HCNTs) were found to exhibit specific values, each of which r…
We report on experiments of light transmissivity, at wavelengths of 532 nm and 400 nm, through an Au film with a wedge shape. Our results exhibit a resemblance with those reported for observing negative refraction in proposed left-handed materials. This resemblance is present even though the medium that we used is wel…
A novel sol−gel route based on aluminum lactate and sodium polyphosphate aqueous solutions has been developed to produce sodium aluminophosphate gels and glasses with the composition 43.8:12.5:43.8 Na 2 O/Al 2 O 3 /P 2 O 5 . Preparations were optimized on the basis of detailed 27 Al solution- state NMR data, revealing…
First-principles studies of the geometry and energetics of the ${\mathrm{Si}}_{36}$ cluster are performed by searching 17 structural isomers including cage, wire, and stuffed fullerene. It is found that the tricapped-trigonal-prism unit is not the structural unit for ${\mathrm{Si}}_{36},$ and the stable structure is i…
We have investigated the magnetic and transport properties of ${\mathrm{Pr}}_{0.65}{\mathrm{Ca}}_{0.35}{\mathrm{MnO}}_{3}$ and ${\mathrm{Pr}}_{0.82}{\mathrm{Na}}_{0.18}{\mathrm{MnO}}_{3}$ with almost the same doping level under various magnetic fields. Upon applying a field of 4 T, both compounds undergo a metamagneti…
We have used scanning tunneling microscopy and potentiometry to study the microstructure and nanoscopic current transport in thin films of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ grown on ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{NdGaO}}_{3}$ substrates. Thin (50 nm) films, which are strained, show step-…
Abstract Maleated polyethylene/silicate nanocomposite and maleated polyethylene/SiO 2 blown films were prepared by melt extrusion. The silicate and SiO 2 significantly affected the physical properties of the films. The former films showed higher tensile strength than the latter films. This high reinforcement effect se…
Abstract Although poly(ethyl methacrylate) (PEMA) and poly(methyl methacrylate) (PMMA) are only slightly different in structure, they are known to be immiscible. Polystyrene is not miscible with PEMA or PMMA. However, when polystyrene is modified to contain certain vinyl phenol groups to become poly(styrene‐ co ‐vinyl…
Ultrathin films of γ-Al 2 O 3 grown on NiAl(001) were studied using high-resolution electron energy loss spectroscopy (HREELS), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED). Growth of the ultrathin oxide films with water produces a hydroxylated surface, as confirmed by vibrational spec…
A series of poly(vinylphenol- co -acetoxystyrene) (PVPh- co -PAS) copolymers were prepared by partial hydrolyses of poly(acetoxystyrene) (PAS) in acidic and basic solutions. Higher glass transition temperature, higher fraction of hydrogen-bonded carbonyl group, and higher interassociation equilibrium constant were obs…
Abstract Glass beads were used to improve the mechanical and thermal properties of high‐density polyethylene (HDPE). HDPE/glass‐bead blends were prepared in a Brabender‐like apparatus, and this was followed by press molding. Static tensile measurements showed that the modulus of the HDPE/glass‐bead blends increased co…
Abstract A water‐soluble cationic copolymer dispersion was prepared by the polymerization of the cationic monomer (2‐methacryloyloxyethyl)trimethyl ammonium chloride and acrylamide initiated with 60 Co γ‐rays. The polymerization was carried out in a salt solution that did not dissolve the resulting copolymer and in th…
Abstract This study investigated some relevant structure/properties relationships in shear‐controlled orientation in injection molding (SCORIM) of high‐density polyethylene (HDPE). SCORIM was used to deliberately induce a strong anisotropic character in the HDPE microstructure. Three grades with different molecular we…
Vegetable tannins are widely distributed in the plant kingdom. In many cases, it is necessary to remove tannins from natural beverages and medicinal plant extracts due to their physiological toxicity. In the present work, an adsorbent for this purpose was prepared on the basis of hide collagen fibers. Its adsorption s…