Materials Literature
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A series of three-arm star densely grafted molecular brushes with poly( n -butyl acrylate) side chains were prepared by atom transfer radical polymerization (ATRP). The three-arm macroinitiators of poly(2-bromopropionyloxyethyl methacrylate) were prepared by ATRP of 2-trimethylsilyloxyethyl methacrylate using trifunct…
Substantial separation of single-wall carbon nanotubes (SWNTs) according to type (metallic versus semiconducting) has been achieved for HiPco and laser-ablated SWNTs. We presently argue that stable dispersions of SWNTs with octadecylamine (ODA) in tetrahydrofuran (THF) originate from the physisorption and organization…
Crystalline and c-axis oriented zinc oxide (ZnO) films with grain structure were deposited on sapphire substrates by pulsed-laser deposition (PLD) technique. The deposited films had cut off at about 390 nm. Photoluminescence (PL) was observed with excitation at 355 nm by third harmonic wave of Nd:YAG laser. In additio…
Abstract A long‐alkane‐segment semicrystalline polyamide based on 1,12‐diaminododecane and 1,12‐dodecanedicarboxylic acid was synthesized and characterized. The polymer was prepared by melt polycondensation. The molecular weight of the material ranged from 20,000 to 40,000 g/mol, depending on the polymerization condit…
We present a phase-field model for the solidification of a binary alloy, which incorporates hydrodynamic effects due to the different densities of the solid and liquid phases. We start from a generalized thermodynamic potential with squared gradient terms for the associated fields; the condition of local positive entr…
The diffusion of fluoresceinated probes inside single collagen fibrils was investigated by imaging the migration of fluorescence along the fibrils in oil and by monitoring fluorescence recovery after photobleaching (FRAP). Probes were excluded from the fibrils according to their size. Probes that were not excluded dif…
Abstract Epiclon [3a,4,5,7a‐tetrahydro‐7‐methyl‐5‐(tetrahydro‐2,5‐dioxo‐3‐furanyl)‐1,3‐isobenzofurandione or 5‐(2,5‐dioxotetrahydrofurfuryl)‐3‐methyl‐3‐cyclohexyl‐1,2‐dicarboxylic acid anhydride] was reacted with L ‐leucine in acetic acid, and the resulting imide acid ( 3 ) was obtained in a high yield. The diacid chl…
Abstract Supercritical Carbon Dioxide (SC CO 2 ) is used as a reaction/processing medium in the fabrication of fiber‐reinforced composite materials. SC CO 2 allows resin (reactive monomer), to penetrate inside the fibers themselves, partitioning into the amorphous regions of the fiber. The crystal structure then templ…
Abstract In this article, a graft, oxidation starch sizing agent was synthesized and its structure and surface morphology were analyzed by infrared (IR) spectroscopy and scanning electron microscopy (SEM). The results show that the synthesized graft oxidation starch has good gelatinizing ability, good film properties,…
Copper nanowires with multiwall carbon nanotubes (MWNTs) encapsulated inside were prepared via surface modification of MWNTs followed by chemical deposition of copper on surfaces. These MWNTs-encapsulated copper nanowires were investigated as a reinforcement to improve the mechanical strength of the Y−Ba−Cu−O supercon…
Abstract It has been observed in plate impact experiments that some brittle solids may undergo elastic deformation at the shock wave front, and fail catastrophically at a later time when they are shocked near but below the apparent Hugoniot elastic limit. Because this phenomenon appears to have features different from…
The molecular orientations in the crystalline and the amorphous phases in a quenched isotactic polypropylene (iPP) film with a smectic structure are studied using an instrument constructed for simultaneous kinetic measurement of microscopic infrared (MicIR) dichroism from a predetermined sampling area with a size of 2…
The multimodal coordinating ability of a new thioether pyrazine ligand was used in conjunction with CuI to construct one-dimensional banded ribbons containing Cu6I6 hexamers which formed two-dimensional sheets through (pyrazine)N⋯H–C(methylene) interactions.
Mesoporous silica MCM-41 was organofunctionalized by 3-aminopropyltrimethoxysilane (APTS) on the surface of its nanochannels. The amino groups of the mesoporous MCM-41 solids were then used to immobilize (VO) 2+ ions which were employed to study the catalytic oxidation of benzene. We found the vanadium peroxo complex…
An absorbing study: The displayed quaterrylenebis(dicarboximide) was imparted with lyotropic liquid-crystalline properties by molecular design. The ability of the molecule to self-organize in solution allows for the subsequent control of its orientation in thin solid films. Induced orientation of the liquid-crystallin…
We have studied the relaxation dynamics of a homologous series of propylene glycol based dimethyl ethers in the supercooled regime by means of broadband dielectric spectroscopy. The system is chosen in order to minimize changes of the intermolecular interactions with varying molecular weight, M. A gradual transformati…
Summary Some aspects of the genesis of terrae rossae are still subject to controversy while others related to the genesis of the mineral fraction have been studied very little. We have studied four terrae rossae over limestone (two Chromic‐Leptic Luvisols, a Rhodi‐Leptic Luvisol and a Chromi‐Leptic Cambisol) in Sierra…
Abstract It is shown, that both the mobility of polymers as well their transition temperatures (glass transition and crystallization) depend on the “flexibility” of simple bonds, i.e., on their ability to promote by energetically stimulated rotations conformational changes to release stresses. The polymer class specif…
The self-assembly of peptides and proteins into beta-sheet-rich high-order structures has attracted much attention as a result of the characteristic nanostructure of these assemblies and because of their association with neurodegenerative diseases. Here we report the structural and conformational properties of a pepti…
Amorphous hydrogenated silicon carbonitride films were produced by remote plasma chemical vapor deposition (RP-CVD) from 1,1,3,3-tetramethyldisilazane (TMDSN) as the single-source compound using a H2–N2 upstream-gas-mixture for plasma generation. The reactivity of particular TMDSN bonds in the RP-CVD initiation step h…