Materials Literature
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Two types of film thickness standards have been developed, manufactured and investigated - for X-ray reflectometry (XRR), X-ray fluorescence analysis (XRR), electron probe microanalysis (EMPA) on the one hand, and ellipsometry on the other. Metrological characterisation of both specific kinds of material measures and…
Structural transitions in melts as well as their dynamics are considered. It is supposed that liquid represents the solution of relatively stable solidlike locally favored structures in the surrounding of disordered normal-liquid structures. Within the framework of this approach the step changes of liquid Co viscosity…
The catalytic mechanism of dihydrofolate reductase (DHFR) requires the addition of both a proton and a hydride ion. In Escherichia coli dihydrofolate reductase (ecDHFR) Asp27 is considered as the only group in the active site capable of providing the proton for the reduction of the N5−C6 bond, although it is not clear…
The electronic and structural properties of molecules (octahydrosilsesquioxane, H 8 Si 8 O 12 ), the monosubstituted and higher phenyl-substituted octahydrosilsesquioxanes (PhH 7 Si 8 O 12, Ph 2 H 6 Si 8 O 12, (Ph-Ph)H 7 Si 8 O 12, and Ph 8 Si 8 O 12 ), and crystals (H 8 Si 8 O 12 and octa(phenylsilsesquioxane) aceton…
Chemical oxidation of single wall carbon nanotubes (SWNTs), produced with the HiPco method, is studied by resonance Raman scattering. The analysis of the radial breathing mode makes it possible to assign the observed bands to metallic and semiconducting SWNTs and to suggest the chiral indices of SWNTs contributing to…
A computational technique was developed to model and simulate molecular or atomic behaviour of materials under static loads. Interatomic potential was used to maintain equilibrium among molecules or atoms under loads and constraints. In addition, a smeared continuum model was derived to represent a very large number o…
ABSTRACT Projectiles of sintered tungsten alloy were fired directly at two kinds of steel target plates. The microstructures near the perforation of a medium, 0.45% carbon steel target plate can be identified along the radial direction as: melted and rapidly solidified layer, recrystallized fine‐grained layer, deforme…
A model of randomly grafted AB copolymer melts is constructed in which flexible B polymer grafts are statistically attached at three possible sites along flexible A polymer backbones. An incompressible melt of such molecules is examined theoretically at equilibrium for two situations: (1) the grafting is irreversible…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTColloidal Crystals of Silica−Homopolypeptide Composite ParticlesBrian Fong, Sibel Turksen, Paul S. Russo, and Wieslaw StryjewskiView Author Information Department of Chemistry and Macromolecular Studies Group, Louisiana State University, Baton Rouge, Louisiana 70803 Cite this:…
Abstract A series of poly(amide‐imide)s were prepared using a new monomer, 1,3‐bis(trimellitimido)‐2,4,6‐trimethyl benzene (BTB), with four different diamines: 1,4‐phenylene diamine (PDA), 2,4‐diamino mesitylene (DAM), 2,2′‐dimethyl‐4,4′‐diamino biphenyl (DMDB), and 2,2′‐bis(trifluoromethyl)‐4,4′‐diamino biphenyl (TFD…
High temperature resolution measurements of thermal conductivity, thermal diffusivity, and specific heat, with simultaneous polarized light visual inspection of the sample, have been performed at two different liquid crystal phase transitions: the SmA-SmC (Smectic-A-Smectic-C) and the SmA-HexB (Smectic-A-hexatic-B) in…
The Be electron inelastic mean free path (IMFP) is calculated by using the GW approximation of many-body theory. It is demonstrated that the inclusion of band structure effects significantly improves the agreement between the calculated and measured IMFP in the energy range up to $\ensuremath{\sim}30\mathrm{eV}.$ We s…
A variable-temperature synchrotron X-ray diffraction study of the phase transitions in the ferroelectric n = 3 Aurivillius oxide Bi 4 Ti 3 O 12 is described. At room temperature the structure of Bi 4 Ti 3 O 12 is orthorhombic in space group B 2 eb and this continuously transforms to the high-temperature tetragonal I 4…
The adsorption of amylose and amylopectin, the two components of starch, on pulp fibers was investigated. It was found that there is a preferential adsorption of amylose on fibers. Both cationic starch and hydroxyethyl ether starch show low-affinity Langmuir-type isotherms, but the adsorption capacity of hydroxyethyl…
The surface electronic structure of the hydrogenated diamond $\mathrm{C}(100)\ensuremath{-}(2\ifmmode\times\else\texttimes\fi{}1):\mathrm{H}$ surface was studied using scanning tunneling microscopy (STM), valence band and core-level photoemission, and near-edge x-ray-absorption fine structure. The hydrogenated diamond…
This study presents chemical synthesis, structural, and physical characterization of novel biodegradable aliphatic poly(butylene succinate-co-cyclic carbonate)s P(BS-co-CC) bearing functional carbonate building blocks. First, five kinds of six-membered cyclic carbonate monomers, namely, trimethylene carbonate (TMC), 1…
Segregation of an acceptor (Zn) and a donor dopant (Nb) in nanocrystalline anatase was studied by EXAFS spectroscopy. Different dopant concentrations between 0.1 and 1 at. % were investigated, and similar results were found for nanocrystalline powders and nanocrystalline ceramics made by hot-pressing the powders. Niob…
Abstract We prepared new semiaromatic polyimides from alicyclic dianhydrides and aromatic diamines containing adamantyl and biadamantyl units. Polycondensations were performed in 1‐methyl‐2‐pyrrolidinone at room temperature for 7 h and then 80 °C for 23 h, giving poly(amic acid)s with inherent viscosities up to 0.58 d…
We report a combined experimental and theoretical study of the unoccupied electronic states of the neutral molecular organic materials TTF (tetrathiafulvalene) and TCNQ (7,7,8,8-tetracyano-$p$-quinodimethane) and of the one-dimensional metallic charge transfer salt TTF-TCNQ. The experimental density of states (DOS) is…
The molecular inorganic compound 1,3,5-{ trans -[RuCl(dppe) 2 ]C⋮C-4-C 6 H 4 C⋮C} 3 C 6 H 3 ( 1 ) is reversibly oxidized in solution using an optically transparent thin-layer electrochemical (OTTLE) cell, the oxidation to 1 3+ resulting in the appearance of a strong absorption band at 11 200 cm -1 in contrast to 1, wh…