Materials Literature
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Abstract Neutron powder diffraction patterns were recorded on CaMn 1‐x Cu x O 3 (x = 0 and 0.20) compounds at different temperatures down to 11K. All the patterns were analyzed by employing Rietveld refinement technique and using the Fullprof program. The observed crystallographic peaks could be refined by using Pbnm…
The effects of various reaction conditions including temperature (200−240 °C), pressure (20−50 bar), and H 2 /CO molar feed ratio (1−2) on the performance of the liquid-phase direct dimethyl ether (DME) synthesis from syngas, over a bifunctional catalyst (CuO/ZnO/Al 2 O 3 + H-ZSM-5) have been studied. The experiments…
Multiferroic BiFeO 3 films have been grown on LaNiO 3-x /SrTiO 3 and Pt/Si substrates by RF magnetron sputtering.The films showed fully saturated ferroelectric hysteresis loops with large remanent polarization of 64 µC cm -2 , suitable for most device applications.Piezoresponse force microscopy confirmed that the film…
Thioesters are more reactive than oxoesters, and thioester chemistry is important for the reaction mechanisms of many enzymes, including the members of the thiolase superfamily, which play roles in both degradative and biosynthetic pathways. In the reaction mechanism of the biosynthetic thiolase, the thioester moietie…
Abstract Two sandwich‐type heteroleptic tetrapyrrole cerium complexes, Ce 2 (dap) 2 (pc) ( 1 ) [dap = 2,8,12,18‐tetraethyl‐3,7‐13,17‐tetramethyl‐5,15‐diazaporphyrinate; pc = phthalocyaninate] and Ce(dap)(oep) ( 2 ) (oep = octaethylporphyrinate), were prepared by a one‐pot reaction of [Ce(acac) 3 ] · n H 2 O (acac = ac…
Abstract Simple blending of natural rubber/ethylene–propylene–diene rubber (NR/EPDM) generally results in inferior mechanical properties because of curative migration and their differences for filler affinity. In this work, the 70/30 and 50/50 NR/EPDM blends prepared by reactive processing techniques were investigated…
Certain transition metal oxides exhibit relatively large compositional changes in response to variations in the oxygen partial pressure. In thin film form, these composition changes can lead to stress because of the constraint imposed by the underlying substrate. To investigate these effects, polycrystalline titania (…
The formation of calcite in the mollusk shell prismatic layer requires the participation of various proteins. Recent studies indicate that the prismatic-associated protein superfamily, Asprich, is capable of in vitro stabilization of amorphous calcium carbonate (ACC), a precursor phase of prismatic calcite. To learn m…
Abstract Crystal‐based finite element methods (FEM) are versatile continuum approaches for predicting mechanical properties and deformation‐induced crystallographic textures. They can be applied to both, elastic–plastic and elastic problems. The methodology is based on (i) a detailed understanding of the underlying cr…
Nano-sized hydroxyapatite (HA) particles stabilized using poly(acrylic acid) (PAA) as a dispersing agent, and sonic energy to further increase dispersion, were blended with poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) using a precipitation/gelation method to produce HA/PHBV nanocomposites with up to 16% by weight o…
Abstract A novel superabsorbent nanocomposite was synthesized through intercalation polymerization of partially neutralized acrylic acid, gelatinized dextrin, and an organic‐montmorillonite powder using N,N ‐methylenebisacrylamide as a crosslinker, Span‐60 as a dispersant, and ammonium persulfate together with sodiums…
Abstract Diethyltoluenediamines (DETDA) was grafted to single‐walled carbon nanotubes (SWNTs) through diazonium‐based addition for improving dispersion and interfacial bonding in SWNT/epoxy nanocomposites. Characterization results of Fourier Transformed Infrared spectroscopy and Raman spectroscopy validated covalent b…
Abstract Poly(lactic acid) (PLA)‐ block ‐poly(norbornene) (PNB) copolymers which bear photocrosslinkable cinnamate side‐chains are synthesized by combining the ring‐opening metathesis polymerization (ROMP) of norbornenes with the ring‐opening polymerization (ROP) of lactides. Highly porous 3D scaffolds with tunable po…
We report on a universal band gap modulation by radial deformation found for semiconductor single-walled carbon nanotubes (SWNTs). The plausible radial deformation of an individual SWNT under hydrostatic pressure is predicted using the method developed in the previous work [M. Hasegawa and K. Nishidate, Phys. Rev. B 7…
Optical conductivity $G(\ensuremath{\omega})$ of graphene, which is famous for its universality close to the Dirac point, is determined from the visible to near-ultraviolet region by using reflection contrast spectroscopy. We find that the universality does not survive beyond the visible region. Instead, $G(\ensuremat…
Hybrid MRI nanoprobes, immunotargeted to the La ribonucleoprotein, which becomes available for binding in the cytoplasm of post-apoptotic permeable cells, are designed for the improved detection of apoptotic tumor cells. The high level of specificity achieved through the use of an optimal polyethyleneglycol interlayer…
Thin films of well‐crystallized pure rutile nanorods were deposited on Ti substrates through a simple solution approach at a low temperature of 353 K. Field emission scanning electron microscopic and atomic force microscopic investigations revealed topographies of both quasi‐aligned and less‐aligned nanorod arrays, de…
An experimental study of acoustic emission (AE) in a single crystal and in a polycrystalline sample of ${\text{Fe}}_{68.8}{\text{Pd}}_{31.2}$ is presented. The samples are studied in a temperature range that is known to include not only a martensitic transition (MT) but also premartensitic effects and strong lattice-p…
Films of cylinder-forming polystyrene- block -poly(methyl methacrylate) (bulk intercylinder spacing a o ) were directed to assemble on surfaces chemically patterned with a hexagonal array of spots (interspot spacing a s ). The block copolymer domain assembly was investigated as a function of the film thickness and the…
A detailed study of polysiloxane nanofiber formation by surface initiated polymerization of vapor phase organotrichlorosilane reagents is presented. Substrate composition, substrate activation, reagent quantity, reaction pressure, and reaction time are parameters shown to influence nanofiber synthesis. Stepwise variat…