Materials Literature
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^2H NMR relaxation measurements were used in an extensive study of chain mobility in poly-(amido amine) (PAMAM) dendrimers as a function of molecular weight and position along the chain. For ^2H labels in the terminal generation, the spin-lattice relaxation times (T_1) were found to decrease as the number of chain ter…
Two series of poly(amido amine) (PAMAM) dendrimers have been prepared. Both were built from an ammonia core via repetitive addition of methyl acrylate and ethylenediamine. End groups were either hydroxyl or amine, the former derived from 2-aminoethanol substituted for ethylenediamine in the final amidation step. The d…
We present a simple expression for the quantitative treatment of interference corrections in x-ray analysis. WDS electron probe analysis of standard reference materials illustrate the success of the technique. For the analytical line of wavelength λ of any element A which lies near or on any characteristic line of ano…
The flexural strength and creep behavior of RE 2 Si 2 O 7 –Si 3 N 4 materials were examined. The retention in room‐temperature strengths displayed by these ceramics at 1300°C was 80–91%, with no evidence of inelastic deformation preceding failure. The steady‐state creep rates, at 1400°C in flexural mode, displayed by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrobial synthesis and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)Shigeo Nakamura, Yoshiharu Doi, and Mariastella ScandolaCite this: Macromolecules 1992, 25, 17, 4237–4241Publication Date (Print):August 1, 1992Publication History Published online1 May 2…
Coupled-wave analysis is used to design binary gratings with high efficiencies (70-80%). The binary designs have grating periods greater than one wavelength but use subwavelength structures within each period in order to achieve high efficiency.
Collagen-based biomaterials have found various applications in the biomedical field. However, collagen-based biomaterials may induce cytotoxic effects. This study evaluated possible cytotoxic effects of (crosslinked) dermal sheep collagen (DSC) using a 7-d-methylcellulose cell culture with human skin fibroblasts. Non-…
The frequency-doubling of 820nm laser light is one of the properties of a series of nitrocalix-[4]arenes making them suitable, in principle, for the construction of a blue laser. Derivative 1 is the most promising, since it displays the greatest hyperpolarizability and the largest dipole moment and is stable as a film…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of the crystalline texture of high-density polyethylene during uniaxial compressionZ. Bartczak, R. E. Cohen, and A. S. ArgonCite this: Macromolecules 1992, 25, 18, 4692–4704Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publish…
Binary optics processing methods were applied to a silicon substrate to generate an array of small pillars in order to enhance transmission. The volume fraction of the silicon in the pillars was chosen to simulate a single homogeneous antireflection layer, and the pillar height was targeted to be a quarter-wave thickn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPush-pull porphyrins as nonlinear optical materialsKenneth S. Suslick, Chin Ti Chen, Gerald R. Meredith, and Lap Tak ChengCite this: J. Am. Chem. Soc. 1992, 114, 17, 6928–6930Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acid)s. 7. Phase structure of the stereocomplex crystallized from a dilute acetonitrile solution as studied by high-resolution solid-state carbon-13 NMR spectroscopyHideto Tsuji, Fumitaka Horii, Masaru Nakagawa, Yoshit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-pot synthesis of hyperbranched polyethersK. E. Uhrich, C. J. Hawker, J. M. J. Frechet, and S. R. TurnerCite this: Macromolecules 1992, 25, 18, 4583–4587Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of a model 3-miktoarm star terpolymerHermis Iatrou and Nikos HadjichristidisCite this: Macromolecules 1992, 25, 18, 4649–4651Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.acs.org/doi…
The electronic properties of a large number of icosahedral-crystal systems have been studied experimentally. These systems include alloys of the simple metals and those that contain transition metals. Some of the icosahedral phases (i-phases) are thermally stable while others are metastable; and their degree of struct…
Local-density-functional theory is used to evaluate the structure, vibrational bands and electronic properties of two point defects in diamond a pair of adjacent substitutional N atoms and a vacancy surrounded by four N atoms. These defects are important as they are possible models of the A and B centres seen in type…
Based on the defect chemistry of acceptor-doped strontium titanate model materials, the role of interfaces in conduction and voltage-induced failure mechanisms is discussed. The impedance behaviour of conventional ceramics and ceramic thin films is compared.
It is now widely accepted that intelligent problem solving requires access to a source of domain‐specific knowledge, and the existence of a control system to constrain the manner in which domain knowledge is searched. An example of a domain which has been intensively investigated is problem solving in physics. A numbe…
The microstructure and morphology of three samples of pyrolytic boron nitride deposited at different temperatures have been characterized with use of x-ray diffraction and thermal-conductivity measurements. The x-ray analysis allowed the determination of the mean interlayer spacing, the out-of-plane coherence length,…
Abstract The compressive‐stress strain response of polyurethane foam under uniaxial compressive impact loading has been studied. The development of a uniaxial constitutive model from strain rate controlled compression tests is detailed. Density and temperature functions have been added to the integral power model prop…