Materials Literature
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The process of dynamic failure of four structural ceramics subjected to unconfined uniaxial dynamic compression is investigated. The four materials examined are α‐SiC, AD 9 95 Al 2 O 3 , β‐Si 3 N 4 , and SiAlON. In each case, the dynamic failure process is studied through dynamic loading of cylindrical specimens withi…
Contemporary methods for the modification of porphyrins are presented. In association with the Third International Conference on Porphyrins and Phthalocyanines (ICPP-3) a survey of current method developments and reactivity studies is made. The review focuses on synthetic transformations of porphyrins currently in use…
The inverse relationship between film thickness and electrical resistivity of metallic films is usually studied by depositing a series of films with different thickness and measuring their sheet resistance with a four-point probe. However, the structure and uniformity of polycrystalline thin films typically depend on…
The sintering behavior and piezoelectric properties of the lead zirconate titanate (Pb(ZrTi)O 3 , PZT)–lead zinc niobate (Pb(Zn 1/3 Nb 2/3 )O 3 , PZN) system were investigated. The sintering temperature required for full densification of the PZT‐PZN system was significantly lowered when the proportion of PZN was incre…
Optical recording disks, which exploit the reversible phase-change phenomenon between amorphous and crystal states of a material, are now in extensive use, particularly in videodisc recorders for home use. The most commonly used recording materials are GeTe-Sb 2 Te 3 pseudobinary compounds and Sb-Te binary compounds w…
The hydrostatic pressure coefficients of interband transition energies of a number of single-walled carbon nanotubes with different chiralities were measured. Optical experiments were performed on debundled, single-walled carbon nanotube suspensions with hydrostatic pressure applied by diamond anvil cells. The pressur…
The chemisorption of singlet O 2 on the side wall of a series of zigzag ( n,0) Single Walled Carbon Nanotubes (SWNTs) ( n = 6 ∼ 15) have been investigated by planewave/pseudopotential- based density functional theory. The process involves two steps, cycloaddition, followed by the breaking of an O−O bond with the forma…
An addition of just 0.4 wt% Li 2 O to (Ba 0.6 Sr 0.4 )TiO 3 powder was able to reduce the sintering temperature to ≤900°C and produce ceramics with a relative density of 97%. Small amounts of two secondary phases were formed during this process: Li 2 TiO 3 and Ba 2 TiO 4 . The addition of Li 2 O depresses the ferroele…
We developed a new device using anisotropic phase separation from liquid crystals (LCs) and polymer composite materials using UV intensity variation and polymer wetting properties for flexible display applications. In the device, LC molecules are isolated in pixels where LCs are surrounded by interpixel vertical polym…
The proposed omnicapped truncated tetrahedral structure of the recently reported Au20 cluster can be generated from a regular dodecahedron by forming two transannular Au-Au bonds across each face while preserving T symmetry. An electron-precise chemical bonding scheme accounts for the large band gap (1.77 eV) of Au20…
Nanotube-containing membranes prepared by the template method show promise for use as highly selective filters for membrane-based chemical and biological separations. Most of the work to date has been done on gold nanotubes prepared by electroless deposition of Au within the pores of polymeric filtration membranes. Th…
Studies were carried out to produce biodegradable films from cassava starch. Two alternatives were investigated. In the first, films were obtained by starch gelatinization followed by thermopressing and glycerol was used at different concentrations as a plasticizer. In the second, starch acetate films were obtained by…
Abstract This paper prepares the ground for the continuum analysis of shear band evolution using a Cosserat/micropolar constitutive equation derived from micromechanical considerations. The nature of the constitutive response offers two key advantages over other existing models. Firstly, its non‐local character obviat…
Methanococcus jannaschii MJ0936 is a hypothetical protein of unknown function with over 50 homologs found in many bacteria and Archaea. To help define the molecular (biochemical and biophysical) function of MJ0936, we determined its crystal structure at 2.4-A resolution and performed a series of biochemical screens fo…
The temperature-dependence of the cation distribution in synthetic spinel (MgAl 2 O 4 ) was investigated using in situ time-of-flight neutron powder diffraction at ISIS, the pulsed-neutron source at the Rutherford Appleton Laboratory. Neutron diffraction patterns of stoichiometric MgAl 2 O 4 were collected on heating…
Abstract Shear and extensional rheological measurements were conducted in conjunction with laser light scattering (LLS) on ethylene‐vinyl acetate copolymer (EVA) nanocomposites. The materials were prepared by melt‐mixing EVA and commercially acquired layered silicates. Wide Angle X‐Ray Scattering (WAXS) was used to as…
A lack of understanding about the selenite adsorption behavior on hydroxyaluminum (HyA)‐ and hydroxyaluminosilicate (HAS)‐interlayered phyllosilicates led us to conduct the present study. The kinetics of selenite adsorption on montmorillonite (Mt), HyA(OH/Al = 2.0)‐Mt, HAS1(OH/Al = 2.0; Si/Al = 0.24)‐Mt, and HAS2(OH/A…
BACKGROUND: Investigations were performed to determine whether poly-N-acetyl glucosamine (p-GlcNAc) induces hemostasis by the activation of platelets. METHODS: Platelets were isolated from human blood, fixed in the presence poly-N-acetyl glucosamine fibers, and visualized with scanning electron microscopy. Platelet ac…
Water-soluble poly(alkyl aryl ether) dendrimers have been explored for their use as hosts of organic substrates in aqueous media. Prototypical photoreactions, namely, photo-Fries reaction of (a) 1-naphthyl benzoate and (b) 1-naphthyl phenyl ester and alpha-cleavage reaction of (a) dibenzyl ketones and (b) benzoin alky…
We report on the controlled chemical grafting of well-defined polymer chains onto individual montmorillonite-type clay nanoplatelets and the direct visualization of the formed hybrid material at the nanoscale level. Our approach is based on the use of a surfactant mixture that contains varying proportions of hydroxyl-…