Materials Literature
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Abstract Ortho ‐selective vapour phase methylation of phenol with methanol has been carried out over Zn (1− x ) Mn x Fe 2 O 4 ( x = 0, 0.25, 0.5, 0.75, 1.0) in the temperature range 423–698K in a fixed‐bed, down‐flow reactor. o ‐Cresol and 2,6‐xylenol were found to be the major products. Reaction parameters were optim…
We report our studies on the mixed Langmuir monolayer of mesogenic molecules, p-(ethoxy)-p-phenylazo phenyl hexanoate (EPPH) and octyl cyano biphenyl (8CB), employing the techniques of surface manometry and Brewster angle microscopy. Our studies show that the mixed monolayer exhibits higher collapse pressures for cert…
Assemblies of polyamide 6 (PA6) with both syndiotactic and isotactic polypropylene (sPP and iPP) have been investigated in the presence of sPP−PA6 diblock copolymers formed in situ at the interface during annealing. Both iPP/PA6 and sPP/PA6 interfaces were stabilized by the sPP−PA6 copolymers. Crystalline orientations…
Tetramethylene urea (TeU) is successfully copolymerized with γ-butyrolactone (γBL), leading to an alternating poly(amide urethane) with alternating carbonyl-amino-tetramethylene-amino and carbonyl-trimethylene-oxy repeating units ( M̄ n = 12 600; M̄ w = 21 100; M̄ n = 1.67) and with a T m of 196.5 °C and a T g of 36.4…
Folding abnormalities of the triple helix have been demonstrated in collagen diseases such as osteogenesis imperfecta in which the mutation leads to the substitution of a single Gly in the (Gly-X-Y)n sequence pattern by a larger residue. Model peptides can be used to clarify the details of normal collagen folding and…
Boron-rich phases with icosahedral symmetry are quite intriguing. It is important to understand the origin of hardness of boron-rich materials. By starting from a chemical bond viewpoint, a simple method for evaluating hardness of boron-rich phases is presented. This method has been applied to some materials such as α…
A magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$ single-crystal (111) surface has been studied at various oxygen-iron surface stoichiometries. The stoichiometry was modified by controlling the in situ sample anneal conditions. We have found the conditions that lead to the formation of an oxygen-rich surface that form…
The growth of CoC 2 O 4 ·2H 2 O particles during aqueous precipitation has been followed by several electron microscopy techniques. A multiple-stage growth leading to final particles with a core−shell structure has been observed. In the first stage, the primary particles grow and aggregate to form secondary particles…
Carbon monoxide oxidation at platinum electrodes in acid solutions presents a characteristic behavior depending on the presence or not of dissolved CO in the bulk of the solution. In the present paper, bulk CO electro-oxidation is studied on a Pt(111) electrode. A change of the (2 × 2)-3CO overlayer, formed by admitti…
We have studied by small-angle neutron scattering (SANS) the crystallization of syndiotactic polypropylene (sPP) homopolymer in dilute hydrocarbon solution in parallel with the self-assembling behavior of crystalline−amorphous block copolymers of (syndiotactic propylene)- block -poly(ethylene- co -propylene) [sPP−P(E-…
Three pyrene alkanethiol derivatives ( P1, P2, and P3 ) possessing flexible alkyl groups of different lengths were attached to nanoparticles of gold (∼2−3 nm in size) along with dodecanethiol (Au− P1, Au− P2, and Au− P3 ). The photophysical properties of these systems were investigated as a function of (i) distance of…
In this work we have studied pulsed 17 O electron nuclear double resonance (ENDOR) spectra of the Gd 3+ aquo ion and the magnetic resonance imaging (MRI) contrast agent MS-325 in an 17 O-enriched frozen glassy water/methanol solution. The isotropic hyperfine interaction (hfi) constant of the water ligand 17 O was foun…
The morphology and viscoelastic properties of films prepared from bimodal latex blends containing equal weight fractions of soft and hard latex particles were investigated as a function of the particle sizes and the particle size ratio (soft particle diameter/hard particle diameter). Minimum film formation temperature…
Designed polypeptides and electrostatic layer-by-layer self-assembly form the basis of promising research in bionanotechnology and medicine on development of polyelectrolyte multilayer films (PEMs). We show that PEMs can be formed from oppositely charged 32mers containing several cysteine residues. The polypeptides in…
A four-step mechanism is hypothesized for the process of fiber formation by interfacial polyelectrolyte complexation: (1) formation of a polyionic complex film at the interface that acts as a viscous barrier to free mixing; (2) scattering of this complex by a drawing motion, creating submicron “nuclear fibers”; (3) gr…
Combining energetic data from density functional theory with thermodynamic calculations, we have studied in detail selective NO reduction under excess O2 conditions on Ir. We show that excess O2 can readily poison the Ir catalyst for NO reduction and the poisoning starts from a low O coverage on the surface. The adsor…
Semiconducting-only single-walled carbon nanotube (SWNT) network field effect transistors (FETs) have been fabricated by selectively reacting all the metallic SWNTs in the devices with diazonium reagents in a controlled manner. We have shown that the concentration of diazonium reagents used is crucial for selectively…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTStrategies in Making Cross-Linked Enzyme CrystalsJ. Jegan Roy and T. Emilia AbrahamView Author Information Biochemical Processing Section, Regional Research Laboratory (CSIR), Trivandrum 695 019, India Cite this: Chem. Rev. 2004, 104, 9, 3705–3722Publication Date (Web):August 6,…
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We have used the LTLSM technique for a spatially resolved investigation of the microwave transport properties, nonlinearities and material inhomogeneities in an operating coplanar waveguide YBa_2Cu_3O_{7-δ} (YBCO) microwave resonator on an LaAlO_3 (LAO) substrate. The influence of twin-domain blocks, in-plane rotated…