Materials Literature
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In order to understand better the drape phenomenon of fabrics, a non-linear finite-element code was developed and the three-dimensional drape shapes of a woven fabric were simulated by using the code. The woven fabric was assumed to be an elastic material with orthotropic anisotropy. The fabric was considered as a thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Side-Chain Liquid Crystalline Homopolymers and Block Copolymers with Well-Defined Structures by Living Anionic Polymerization and Their Thermotropic Phase BehaviorMasayuki Yamada, Akira Hirao, Seiichi Nakahama, Tsukasa Iguchi, and Junji WatanabeCite this: Macrom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and Bond Energies of the Transition-Metal Carbonyls M(CO)5 (M = Fe, Ru, Os) and M(CO)4 (M = Ni, Pd, Pt)Andreas W. Ehlers and Gernot FrenkingCite this: Organometallics 1995, 14, 1, 423–426Publication Date (Print):January 1, 1995Publication History Published online1…
The effect of temperature on adsorption isotherms of cyclopentane on mesoporous MCM-41 molecular sieves with different pore size has been determined at 243–333 K. The occurrence of adsorption hysteresis upon capillary condensation in mesopores depends on the pore critical temperature, which is lower than the bulk crit…
The variation of the number and position of OH substituents at the phenyl ring of α-phenyl nitronyl nitroxide radicals yields different hydrogen-bonded molecular self-assemblies with distinct dimensionalities; the mono-ortho-substituted isomer is most remarkable since it shows a three-dimensional network of weak hydro…
Fluoropolymers modified by plasma modification were studied for their suitability as surfaces for the adhesion of cells. We compared films made by plasma modification of fluoroethylenepropylene (FEP) using nitrogen-containing gases (ammonia or dimethyl acetamide) with films deposited using oxygen-containing monomers (…
The partial substitution of Ce in CeO2 with isovalent elements like Hf and Zr greatly increases the overall activity of methane combustion measured as light-off and ignition temperature; the presence of a defective fluorite-structured oxide is recognized as a key factor in the activity enhancement.
The structural transformation from fcc to fct and relevant magnetic properties of initially multilayered Fe/Pt films were studied. When the as-deposited Fe/Pt films were annealed at the temperature of 300/spl deg/C and up, the fct-phase was formed. Rather square hysteresis loops and large coercivities were measured fr…
Thermodynamic phase equilibria of a polymer dispersed liquid crystal (PDLC) consisting of monomeric liquid crystals and a polymer have been investigated theoretically and experimentally. The equilibrium limits of phase separation as well as phase transition of a PDLC system were calculated by taking into consideration…
A mesoporous crystalline iron-containing MCM-41 molecular sieve is prepared by direct hydrothermal synthesis; XRD, framework IR, ESR, UV–VIS and solid-state 29Si MAS NMR spectroscopies provide evidence of iron(III) incorporation into framework positions.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Polypyrrole-Tin(IV) Oxide Nanocomposite ColloidsShuichi Maeda and Steven P. AmesCite this: Chem. Mater. 1995, 7, 1, 171–178Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 19…
Nanoparticles of Fe2O3 are encapsulated into the uniform pores of MCM-41 and the bandgap of the resulting Fe2O3particles is widened from 2.1 to 4.1 eV owing to the quantum size effect.
Mesoporous manganosilicate materials Mn-M41S, having hexagonal, cubic and lamellar structures, are synthesized with a low surfactant: Si ratio (0.12 : 1) at various temperatures and acid/base contents and are characterized by X-ray powder diffraction and Q-band EPR spectroscopy.
Abstract Simulations of the structure and dynamics of fluid films confined to a thickness of a few molecular diameters are described. Confining walls introduce layering and in‐plane order in the adjacent fluid. The latter is essential to transfer of shear stress. As the film thickness is decreased, by increasing press…
A new computer code (MARVIN), employing two-dimensional (2D) periodic boundary conditions, has been developed for the simulation of surfaces and interfaces. The models and methodologies incorporated within the program are discussed. The utility of the program in calculating crystal morphologies is explored using α-Al2…
Two different methods for CuO powder, mounting using adhesive tape and compressed powder pellets were compared as to how these methods influence the XPS measurements. In Ar+ sputtering, these methods showed differences in the extent of selective sputtering by oxygen and the reduction rate. In a long period of sputteri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Dimensions in Amorphous Polymer MeltsZhen-Gang WangCite this: Macromolecules 1995, 28, 2, 570–576Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https://pubs.acs.org/doi/10.1021/ma00106a022https://do…
The synthesis of some new chiral radial pentaynes exhibiting enantiotropic cholesteric discotic (ND*) phases at moderate temperatures is presented. By alteration of the lateral substituents we were able to obtain the phenomenon of selective reflection as well as a temperature induced helix inversion. In the latter, di…
Arbitrary dynamic magnetostriction under alternating and rotating field is measured by using a two-dimensional magnetic measurement technique with a three-axial strain gage, which provides its output in a direction inclined 45/spl deg/ 90/spl deg/, and 135/spl deg/ to the rolling direction of a sample sheet. By this t…
The degradative changes in silk are investigated with amino acid analysis and solubility under denaturing conditions (7M urea). These biochemical techniques use extremely small samples for quantitative analyses and are capable of detecting chemical alterations at the molecular level. The biochemical results are used t…