Materials Literature
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Self-assembled monolayers of a small bifunctional molecule (4-carboxythiophenol) have been formed on Al and Au surfaces. The nature of coordination of the molecules to the two metal surfaces is different, leading to different terminal functionality of the monolayer surface. This aspect has been favorably exploited to…
Vapor-phase pyrolysis of Fe(CO) 5 in the presence of another carbon source such as CO or C 6 H 6 yields iron-filled or hollow nanotubes depending on the relative concentration of the carbon source. Essentially single-walled nanotubes are obtained when the C 6 H 6 /Fe(CO) 5 ratio is high. Pyrolysis of metallocenes yiel…
Abstract The ligand N,N,N',N' ‐tetra‐ethylpyridine‐2,6‐dicarboxamide ( L 9 ) reacts with trivalent lanthanide ions (Ln III ) to give stable mononuclear triple‐stranded helical complexes [Ln( L 9 ) 3 ] 3+ (Ln = La to Lu). The crystal and molecular structures of [La( L 9 ) 3 ](ClO 4 ) 3 .2.5C 2 H 5 CN ( 8 ) and [Eu( L 9…
The conformation of silk fibroin in silk fibroin/chitosan (SF/CS) blend membrane was analyzed by infrared spectrum, X-ray diffractometry, and Raman spectrum. The results demonstrated that the SF could show β-sheet conformation when the SF content in blend membranes was 10% (w/w) and 60–80% (w/w), while the pure SF mem…
Constant strain rate tensile tests have been conductedfor fine grained Mg-Al-Zn (AZ91) and Mg-Zn-Zr (ZK60 and ZK61) alloys processed by powder metallurgy (PM) and ingot metallurgy (IM) routes. The experimental results revealed that the strain rate was inversely proportional to the cube of the grain size and that the a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEvidence for Novel Interdigitated Bilayer Formation of Fatty Acids during Three-Dimensional Self-Assembly on Silver Colloidal ParticlesVijaya Patil, K. S. Mayya, S. D. Pradhan, and Murali SastryView Author Information Materials Chemistry Division National Chemical Labo…
The synthesis, X-ray crystal structures, and some spectroscopic and chemical properties of the nitrosylruthenium(II) porphyrin complexes Ru(TPP)(NO)(ONO), Ru(TPP)(NO)(OH), Ru(OEP)(NO)(ONO), and Ru(OEP)(NO)(OH) (TPP = tetraphenylporphyrinato dianion; OEP = octaethylporphyrinato dianion) derived from the analogous Ru(II…
Abstract Ultimate success in the design of solid oxide catalysts as well as other covalently bonded or heterogenised organometallic catalysts predicates knowledge of precisely what structure it is that has to be targetted. This, in turn, demands the greatest possible precision in determining, under operating condition…
Neutron diffraction and inelastic neutron scattering in zero field have been performed on mesoscopic magnetic ${\mathrm{Mn}}_{12}{\mathrm{O}}_{12}$ clusters, well known for their macroscopic quantum effects observed at low temperature. In addition to the static spin correlations of the cluster in its ground state, we…
Thin films of (Ba,Sr)TiO3 on Pt/SiO2/Si substrates were deposited using rf magnetron sputtering at various substrate temperatures and O2/(Ar+O2) mixing ratios (OMR). The crystallinity of the films improved significantly as the OMR increased. The dielectric constant increased with increasing OMR and reached a maximum v…
The synthesis and structural and magnetic properties of the pentanuclear complex [(Ni(bpm) 2 ) 3 (Fe(CN) 6 ) 2 ]·7H 2 O ( 1 ) are reported. Complex 1 crystallizes in the tetragonal space group P 4 3 2 1 2 (No. 96) with the following cell parameters at 23(1) °C: a = b = 12.888(2) Å, c = 42.927(2) Å, V = 7130(3) Å 3, an…
A new mode of polymerization of glycidyl acetate ( 1a ) to yield a poly(ortho ester), i.e., poly[(2-methyl-1,3-dioxolane-4,2-diyl)oxymethylene] ( 3a ), was explored. This new polymerization exclusively proceeded when a bulky Lewis acid, methylaluminium bis(2,6-di- tert -butyl-4-methylphenoxide) ( 2a ), was employed as…
Abstract On treatment of allyl-t-butyldiphenylsilane with t-BuOK and 18-Crown-6 in DMSO at room temperature, isomerization of the olefinic double bond and subsequent substitution of phenyl group with hydroxy group took place smoothly to afford alkenylsilanol derivatives in good yields.
An alternative system which could be an interesting candidate for electrochromic material is presented. The system is based on the deposition and stripping of a lead thin film on indium‐tin oxide‐coated glass (ITO).The electrodeposition and electrodissolution of lead was performed by cyclic voltammetry or potentiostat…
This study proposes a methodology for modeling the fatigue response of cross-ply ceramic matrix composites (CMCs). The micromechanics based analysis and failure criteria are formulated to model stress-strain hysteresis, strain ratchetting and S-N behavior specific to room-temperature cyclic loading environments. The d…
When a hot solid particle is submerged into an ambient fluid near a free liquid-gas interface, a non-uniform temperature field around the particle produces surface tension gradients at the interface and generates thermocapillary flow in the surrounding fluid. This flow sets the particle itself in motion towards or awa…
L'oxydation sous air a haute temperature des alliages base titane α de type IMI 834 et TIMETAL 1100 conduit a la formation de couches oxydees non protectrices. Par ailleurs, la solubilisation d'oxygene dans l'alliage fragilise ce dernier en diminuant sa ductilite. Une amelioration de la tenue a l'oxydation et une prev…
This paper is the first part of a series reporting on the recent development of a yarn modification process to produce torque-balanced singles spun yarns. Taking advantage of the core-sheath structure of unconventionally spun yarns, we have developed a yarn modification process and applied it to singles yarns spun by…
The kinetics of thermal decomposition of epoxy resin are investigated under various heating rates (2, 5, 10, and 20 K/min) and oxygen concentrations (5, 10, and 20%) in the nitrogen-oxygen atmosphere by means of thermogravimetric measurements. Results show that, unlike only one stage of reaction in the inert atmospher…
A new computer model is developed to predict the tensile behavior of nonwoven fabrics from the stress-strain behavior of their constituent fibers and distributions of fiber orientation angles. The finite element method is used to calculate the numerical solution of stress and strain distribution in different regions o…