Materials Literature
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We investigate the rheological behavior of Langmuir monolayers consisting of polyisoprene chains tethered by one end to the air/water interface. These 10−50 nm thick monolayers provide model systems of a molten polymer brush for which the ends can move within the interface. Their linear viscoelastic properties are det…
Abstract— Two basic approaches (pure component reference (PCR) and equilibrium reference (EQR)) to modeling silicate melt evaporation are explored. The PCR model calculates the maximum possible evaporation rates of the pure oxides from their equilibrium vapor pressures and rescales these rates according to the activit…
Abstract Having been treated with coupling agent and pan‐milling, graphite is incorporated into HDPE to make a HDPE/graphite composite with enhanced thermal conductivity as well as good mechanical properties and processibility. This paper focuses on the study of mechanical properties, thermal stability and rheological…
YCa 4 O(BO 3 ) 3 has been found to be 90° phase-matchable for type-1 second-harmonic generation at 0.4168 µm along the z -axis at 20°C. The improved Sellmeier equations of YCa 4 O(BO 3 ) 3 that correctly reproduce our new experimental data for second-harmonic and sum-frequency generation in the 0.3547–1.9079 µm range…
Texture effects caused by preferred orientation can be corrected in Rietveld analysis by an alternative algorithm presented in this contribution. This algorithm is equivalent to models using symmetrized linear combinations of spherical harmonic functions, but it is unique to all Laue classes and to all orders. Positiv…
The detailed mechanism of the reversible binding and fast exchange of SO 2 on the organoplatinum(II) complex [PtI(NCN)], 1, has been studied experimentally in solution (C 2 F 4 Br 2 ) using low-temperature NMR spectroscopy and theoretically by ab initio calculations. Direct bonding of SO 2 and formation of the thermod…
Tetracyclines such as chlortetracycline and doxycycline with antimicrobial activity were reported to possess cytostatic and cytotoxic activity against mammalian tumor cells, often at high doses. Non-antimicrobial chemically modified tetracyclines (CMTs), with limited systemic toxicity but with significant tumor cell t…
Size reduction of microcrystalline cellulose (MCC, Avicel PH-101) powder by ball milling was poorly effective, particularly in the presence of sodium lauryl sulphate (SLS), which tended to form a protective foam. Ultrasonic homogenisation of an aqueous suspension more readily produced ultra-fine MCC, even in the prese…
The photoelectric effect was discovered and explained in terms of quantum physics about a hundred years ago. Today, photoemission spectroscopy using vacuum ultraviolet radiation and x-rays is an important tool for studying the electronic properties and atomic structure of solids. This paper reviews the development of…
Ti-doped MoS2 nanotubes are produced by pyrolyzing a H2S/N2 mixture over an oxidized Ti–Mo alloy powder at elevated temperatures. Partial substitution of Mo by Ti does not significantly alter the 2H–MoS2 lattice.
Abstract Free drainage in compressed‐air foams were studied experimentally and theoretically. The time evolution of liquid holdup profiles in a 0.2‐m‐high by 0.29‐m‐diameter foam column was determined at various heights by measuring sonic velocity. A new experimental technique was devised to measure the true drainage…
Equilibrium water absorption behavior of epoxy/carbon fiber composites was investigated under hygrothermal conditions. The temperature dependence of the equilibrium water uptake was quantitatively determined by assuming two distinctly different physical states of bound water and free water. The bound water was viewed…
We have investigated the spectral responsivity of porous silicon Schottky barrier photodetectors in the wavelength range 0.4-1.7 mum . The photodetectors show strong photoresponsivity in both the visible and the infrared bands, especially at 1.55 mum . The photocurrent can reach 1.8 mA at a reverse bias of 6 V under i…
With continuum-based density-functional theory, we have analyzed the liquid-crystal phases of finite-sized capped carbon nanotubes as a function of nanotube length and diameter for (i) the case when the nanotubes interact via the fully attractive van der Waals force; and (ii) when such interactions are screened out an…
We report surface-initiated thermal radical polymerization from cross-linked monolayers of azo-initiators on Au. Initial attempts to graft polymer layers from initiators attached to alkanethiol monolayers yielded polymer films with thicknesses less than 5 nm. Efficient grafting from such surfaces is not possible becau…
Electromagnetic interference (EMI) shielding on plastic mostly consists of conductive fibers in a polymer matrix. This study describes a route for the fabrication of carbon nanofiber filled poly(vinyl alcohol) (PVA) coating materials. Electrical conductivity of the coating materials ranged from 0.033 to 0.169 S/cm dep…
The magnetic properties of mixed-valent compounds of general formula Ru2Cl(mu-O2CR)4 [R = CH2-CH3 (1), C(Me)=CHEt) (2)] have been studied in the 2-300 K temperature range. This magnetic study also includes a revision of the magnetic properties of the complex Ru2Cl(mu-O2CCMePh2)4 (3). Compounds 1-3 show a linear struct…
The X-ray crystal structure of the substrate free form of Staphylococcus aureus UDP-N-acetylenolpyruvylglucosamine reductase (MurB) has been solved to 2.3 A resolution with an R-factor of 20.3% and a free R-factor of 22.3%. While the overall fold of the S. aureus enzyme is similar to that of the homologous Escherichia…
The functionalization of mesostructured and/or mesoporous MCM-41 related silicas is easily achieved by treatment under NH3 atmosphere at relatively low temperatures without structural collapse. Nitridation, which occurs through a single-step solid-state reaction, yields for the first time ordered mesoporous silicon ox…
Abstract Ternary fibrillar reinforced blends are obtained by melt‐blending of poly(ethylene terephthalate) (PET), polyamide 6 (PA‐6) and polyamide 66 (PA‐66) (20/60/20 by weight) in the presence of a catalyst, followed by cold drawing of the extruded bristles to a draw ratio of about 3.4 and additional annealing of th…