Materials Literature
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Phase behavior of ethylene oxide (EO)-propylene oxide (PO)-ethylene oxide triblock copolymers in water has been investigated, by using 2H NMR and polarizing microscopy, as functions of both concentration and temperature.Seven copolymers, having wide variations of composition and molecular weight, are used.It has been…
Mathematical Modelling of Solid State Power Sources (J-Y Chern) Silver Ion Conducting Electrolytes (T Takahashi) Copper Ion Conducting Electrolytes (R Linford) Reliability and Clinical Assessment of Pacemaker Power Sources (J Lin & E Schroeppel) Electrochemistry of Conducting Polymers (W H Smyrl) Polymer Synthesis, Pr…
The transduction of sound into light by a pulsating bubble in water occurs when its maximum radius is about ten times greater than its ambient radius. For such high-amplitude motion, the steady-state balance of mass flow between the bubble and gas dissolved in the surrounding fluid can be maintained by diffusion only…
The conductivities of a protonic conductor, 10 mole percent (m/o) In 2 O 3 ‐ doped CaZrO 3 , were measured in an atmosphere containing hydrogen or deuterium with the 4‐wires ac impedance technique at temperatures ranging from 623 to 1673 K. In high oxygen activities, H + /D + ‐isotope effects were observed below about…
This work focuses on synthetic polymeric materials that are designed to function as soil conditioners. A classification of the various polymeric soil conditioners is given and a historical review is attempted. One hundred and three examples are examined, covering the period from 1950 up to today. The routes followed f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCis-Trans Thermal Isomerization Rates of Bound and Doped Azobenzenes in a Series of PolymersC. Barrett, A. Natansohn, and P. RochonCite this: Chem. Mater. 1995, 7, 5, 899–903Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1…
Franky R. G. Terras, Kristel Eggermont, Valentina Kovaleva, Natasha V. Raikhel, Rupert W. Osborn, Anthea Kester, Sarah B. Rees, Sophie Torrekens, Fred van Leuven, Jozef Vanderleyden, Bruno P. A. Cammue, Willem F. Broekaert, Small Cysteine-Rich Antifungal Proteins from Radish: Their Role in Host Defense, The Plant Cell…
Highly transparent and conductive amorphous zinc-stannate thin films were prepared by rf magnetron sputtering using a target with a Zn/(Zn+Sn) content of 33 at. %. The resistivity distribution of the zinc-stannate films having a composition near ZnSnO3 and deposited on the surface of substrates placed parallel to the…
The spectral line shapes and the absorption frequencies of the oxygen related infrared active vibrational modes in amorphous SiO2 are studied both experimentally and by simulation. Experimental data were obtained on oxides grown thermally in the temperature range from 800 to 1050 °C and on oxides deposited at 300 °C b…
Judd‐Ofelt parameters Ω t with t = 2,4, 6 for the rare‐earth ions Pr 3+ , Nd 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , and Tm 3+ in alkali and/or alkaline‐earth silicate, borate, and phosphate glasses have been determined. The variations of Ω t with the number of 4 f electrons of the rare‐earth ions are demonstrate…
The ferroelectric Langmuir-Blodgett films are prepared and investigated for the first time The films are prepared from the ferroelectric copolymer of vinylidene fluoride with trifluorethylene The films with the thickness off 150 Å show the pyroelectric effect being measured along the polar C-axis perpendicular to the…
Cathodic overpotentials of Ln 0.6 Sr 0.4 MnO 3 ( Ln = La , Pr , Nd , Sm , Gd , Yb , and Y ) were studied for a new cathode of solid oxide fuel cell (SOFC). Cathodic overpotentials as well as the electrical conductivity strongly depended on the rare earth cations used for the A sites of perovskite oxide. Strontium dope…
Carbon ions were implanted into crystal silicon wafers at an energy of 50 keV and with a dose of 1017 cm−2 followed by thermal annealing. A layer of polycrystalline β-SiC was formed beneath the sample surface. Porous nanometer structures were prepared by conventional anodization. At room temperature, the samples exhib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting Polyaniline Nanoparticle Blends with Extremely Low Percolation ThresholdsPallab Banerjee and Broja M. MandalCite this: Macromolecules 1995, 28, 11, 3940–3943Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1…
Polymers which are attached to a fluid membrane by a single anchor exhibit a dilute mushroom regime and a semi-dilute brush regime. Scaling arguments and explicit calculations for ideal polymers show that the membrane is bent by the anchored polymer: For smooth bends, an anchored mushroom with linear size R po induces…
We consider the diffraction of a time-harmonic wave incident upon a grating (or periodic) structure. We study mathematical issues that arise in the direct modeling, inverse, and optimal design problems. Particular attention is paid to the variational approach and to finite-element methods. For the direct problem vario…
A new modeling system to determine the optical response function of a multilayer structure with imposed periodicity in the plane of the layers, a multilayer diffraction grating, is described. This new model has two essential ingredients. This model is based on the well-established coordinate transformation procedure d…
The upconversion mechanism of Er3+ ions has been studied for lead-germanate glasses containing Er2O3 concentrations from 0.1 mol % to 2 mol %. Intense green emission was observed at room temperature due to 4S3/2→4I15/2 transition excited by a cw near-infrared laser beam at 797 nm. This green emission shows a similar i…
In Part 1 of this work, we formulated and analyzed a mathematical model for our fibroblast-populated collagen microsphere (FPCM) assay of cell traction forces (Moon and Tranquillo, 1993). In this assay, the FPCM diameter decreases with time as the cells compact the gel by exerting traction on collagen fibrils. In Part…
Abstract Nylon 6‐clay hybrid (NCH) is a molecular composite of Nylon 6 and uniformly dispersed silicate monolayers of montmorillonite. In this study the preferred orientation of montmorillonite and Nylon‐6 crystallites in a thick (3 mm) injection‐molded bar of NCH has been investigated using x‐ray diffraction and elec…