Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAssembly of Latex Particles by Using Emulsion Droplets. 3. Reverse (Water in Oil) SystemO. D. Velev and K. NagayamaView Author Information Nagayama Protein Array Project, ERATO, JRDC, 5-9-1 Tokodai, Tsukuba, 300-26 Japan Cite this: Langmuir 1997, 13, 6, 1856–1859Publication Dat…
The sol-gel transition in a suspension of monodisperse, charged, disklike platelets (Laponite, i.e., a synthetic clay) is examined within a simplified statistical model. The initial ``primitive'' model of uniformly charged disks surrounded by microscopic co ions and counterions is reduced to a model of nonintersecting…
Ytterbium oxide (Yb 2 O 3 ) was used as a sintering aid to enhance the mechanical properties of silicon nitride (Si 3 N 4 ) ceramics. The amount of Yb 2 O 3 had significant effects on microstructural evolution and the composition of secondary phases at the grain boundary. When the Yb 2 O 3 added was less than 8 wt%, s…
Abstract Short term shearing at low degrees of supercooling with subsequent monitoring of the crystallization process of iso-tactic polypropylenes leads to highly oriented surface layers and fine grained layers that reach further into the core of the solidified samples. This process is highly dependent on the content…
Miniaturization and silicon integration of micro enzyme reactors for applications in micro total analysis systems (µTASs) require new methods to achieve structures with a large surface area onto which the enzyme can be coupled. This paper describes a method to accomplish a highly efficient silicon microstructured enzy…
Interaction of cis -Ptdppp( p -C 6 H 4 CN) 2 or cis -Ptdppp( p -C 2 C 6 H 4 N) 2 with cis -ML 2 (OSO 2 CF 3 ) 2 (M = Pt or Pd; L = PEt 3 or L 2 = dppp), in CH 2 Cl 2 or acetone, at room temperature, results in mixed, neutral-charged cyclic tetranuclear, Pt−Pt or Pt−Pd macrocyclic complexes in 90−99% yields via self-as…
Melamine and its salts added to polyamide 6 (PA-6, nylon 6) improve its fire retardancy as measured by oxygen index and UL94 tests. The mechanism of the fire-retardant action of the additives was studied using thermogravimetry, kinetics of thermal decomposition and characterization of solid residues and evolved high-b…
We investigated the order−order transition (OOT) and the order−disorder transition (ODT) in a polystyrene- block -polyisoprene- block -polystyrene copolymer (Vector 4111, Dexco Polymers Co.), which has a weight-average molecular weight of 1.4 × 10 5 and a 0.183 weight fraction of polystyrene (PS) blocks, using small-a…
An approximate closed-form expression for the loss in a planar phase grating is derived by using coupled-mode theory. It is shown that this loss expression can be used to determine the spectral and angular width of a resonant-grating filter. A resonant-grating filter is a free-space optic that takes advantage of grati…
ABSTRACT Glycerol‐plasticized soy protein films were cast from alkaline aqueous film‐forming solutions of laboratory‐prepared 7S, 11S, and soy isolate (LSI) fractions and from commercial soy isolate (CSI). Tensile strength (TS), elongation at break (E), water vapor permeability (WVP), total soluble matter (TSM), prote…
Phthalocyanine‐based nonlinear optical (NLO) materials are reviewed, with particular emphasis on second‐order effects. The requirements on materials and molecules for NLO activity are outlined before three recently studied families are briefly considered: asymmetrically substituted phthalocyanines (Pcs), subphthalocya…
Poly(ethylene terephthalate) substrates were coated with thin films of silicon oxide deposited by magnetically enhanced chemical vapor deposition. The rates of oxygen and water vapor transport through the coated and uncoated film systems were obtained as a function of temperature. Activated rate theory treatment of ox…
Spontaneous sequential adsorption of poly(allylamine hydrochloride) and poly(sodium styrene sulfonate) (layer-by-layer deposition) onto surface-oxidized poly(4-methyl-1-pentene) film was studied with the objective of creating an asymmetric gas separation membrane consisting of a thin multilayer barrier layer on a more…
One-dimensional and two-dimensional solids consisting of polyoxoanions bridged by (M(LL)2)2+ groups have been synthesized by hydrothermal methods and structurally characterized by X-ray crystallography.
Methanolysis of { t -Bu 2 In[μ-P(SiMe 3 ) 2 ]} 2 ( 1 ) in aromatic solvents gives polycrystalline InP fibers (dimensions 10−100 nm × 50−1000 nm) at 111−203 °C. The chemical pathway consists of a molecular component, in which precursor substituents are eliminated, and a nonmolecular component, in which the InP crystal…
A small amount of locally reversible melting and crystallization in poly(ethylene terephthalate) (PET) has been detected by temperature-modulated differential scanning calorimetry (TMDSC). Extended-time TMDSC was used in the quasi-isothermal mode. Studied were melt-crystallized, quenched, and a biaxially-oriented film…
Over the past decade, developments in molecular biology, X-ray diffraction and nuclear magnetic resonance (NMR) instrumentation, and computational methods have allowed nearly exponential growth of macromolecular structural studies. The analysis of data from these studies generally requires sophisticated computational…
A kinetic theory of glasses is developed using equilibrium theory as a foundation. After establishing basic criteria for glass formation and the capability of the equilibrium entropy theory to describe the equilibrium aspects of glass formation, a minimal model for the glass kinetics is proposed. Our kinetic model is…
Dynamical simulations of bulk sedimentation have been carried out, using up to 32 000 solid particles. There is no evidence that the long-range hydrodynamic interactions are screened by changes in the pair correlation function at large distances. Instead the velocity fluctuations and diffusion coefficients diverge lin…
We present new experimental data and molecular simulation results for the adsorption of nitrogen in MCM-41. We show that models in which the solid−fluid interaction potential is homogeneous cannot reproduce the form of the adsorption isotherm, particularly at low pressures. A new heterogeneous interaction model is sho…