Materials Literature
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Sheared self-assembled lamellar phases formed by symmetrical diblock copolymers are investigated through dissipative particle dynamics simulations. Our intent is to provide insight into the experimental observations that the lamellar phases adopt parallel alignment at low shear rates and perpendicular alignment at hig…
Tetrakis(aryloxy)phthalocyanine (4c) and its Zn congeners (4a and 4b) and Ni congener (4d) were synthesized, and their self-assembling properties in coordinating and non-coordinating solvents were investigated by absorption and fluorescence spectroscopy, matrix-assisted laser desorption ionization time-of-flight mass…
A facile template-free aqueous solution strategy of oriented attachment assisted self-assembly of Sb 2 O 3 nanorods and nanowires into well-defined complex nanostructures is described in this paper. It is demonstrated that at the temperature of 40 °C, the Sb 2 O 3 nanorods with different lengths (2∼50 μm) and diameter…
To provide for prolonged, site-specific delivery of basic fibroblast growth factor (bFGF) to the grafted skin in a convenient manner, biodegradable chitosan-gelatin microspheres containing bFGF were fabricated and incorporated into a porous chitosan-gelatin scaffold in this study. The microspheres are an integral part…
Silver pyrazolates [[3-(CF3)Pz]Ag]3, [[3-(CF3),5-(CH3)Pz]Ag]3, [[3-(CF3),5-(Ph)Pz]Ag]3, [[3-(CF3),5-(But)Pz]Ag]3, and [[3-(C3F7),5-(But)Pz]Ag]3 have been synthesized by treatment of the corresponding pyrazole with a slight molar excess of silver(I) oxide. This economical and convenient route gives silver pyrazolates i…
Two tricyanometallate precursors, (Bu 4 N)[(Tp 4Bo )Fe(CN) 3 ]·H 2 O·2MeCN ( 1 ) and (Bu 4 N)[(pzTp)Fe(CN) 3 ] ( 2 ) [Bu 4 N + = tetrabutylammonium cation; Tp 4Bo = tris(indazolyl)hydroborate; pzTp = tetrakis(pyrazolyl)borate], with a low-spin Fe III center have been synthesized and characterized. The reactions of 1 o…
Patterns of behavior: Complexes of the cluster {Mo72Fe30} and the surfactant dioctadecyldimethylammonium chloride (DODMACl) produced in CHCl3 form patterns with a honeycomb structure at the air/water interface after evaporation of the solvent (see SEM image). The concentration of DODMACl in CHCl3 is critical to whethe…
A facile laser-etching method was used for the one-step creation of various controllable dimensions of anisotropic micropatterns consisting of an alternating arrangement of microgrooves and microstripes with rugged nanoprotrusions, which after modified with fluoroalkylsilane reagent, showed perfect isotropic superhydr…
The phase behavior of 44 poly(isoprene- b -styrene- b -ethylene oxide) (ISO) linear triblock copolymer melts was investigated at weak to intermediate segregation strengths and spanning a comprehensive range of compositions. Phases were characterized by a combination of experimental techniques, including small-angle X-…
Using videomicroscopy data of a two-dimensional colloidal system the bond-order correlation function G{6} is calculated and used to determine both the orientational correlation length xi{6} in the liquid phase and the modulus of orientational stiffness, Frank's constant F{A}, in the hexatic phase. The latter is an ani…
The synthesis and characterization of water-soluble nitric oxide (NO)-releasing monolayer-protected gold clusters (MPCs) are reported. Tiopronin-protected MPCs ( approximately 3 nm) were functionalized with amine ligands and subsequently exposed to 5 atm of NO to form diazeniumdiolate NO donors covalently bound to the…
Small angle neutron scattering studies on polystyrene loaded with spherical silica nanoparticles under contrast-matched conditions unequivocally show that chain conformations follow unperturbed Gaussian statistics independent of chain molecular weight and filler composition. Liquid state theory calculations are consis…
Farbenfroh: Durch Einstellen der Elektronendonoreigenschaften des π-konjugierten Bithiophen-Gerüsts wurden intensiv emittierende Festkörper erhalten, deren Maxima einen großen Teil des sichtbaren Spektrums abdecken (siehe Bild). Eine tiefrote Fluoreszenz mit großer Stokes-Verschiebung um 200 nm resultiert aus einem in…
Novel hybrid triphenylene-carbosiloxane liquid crystalline monomers and star-shaped oligomers have been synthesized and their thermal behavior and liquid-crystalline properties analyzed and characterized. All compounds exhibit a columnar hexagonal phase and show, particularly the oligomers, a small tendency to crystal…
Photodynamic therapy (PDT) is a noninvasive treatment of some diseases including cancer. We have developed poly(ethylene glycol) (PEG)-attached dendrimers as a drug-carrier candidate. In this study, we prepared nanocapsules of photosensitizers using PEG-attached dendrimers for application to PDT. Two PEG-attached dend…
Zinc stannate (Zn 2 SnO 4 ) particles with 27-nm size were synthesized by hydrothermal treatment. Nanoporous Zn 2 SnO 4 thin films were prepared on conducting glass substrates and used as working electrodes in dye-sensitized solar cells, DSSC. Their behavior was compared with standard TiO 2 cells, using (TBA) 2 -cis -…
We measure the magnetic damping parameter a in thin film CoFeB and permalloy (Py) nanomagnets at room temperature using ferromagnetic resonance driven by microwave frequency spin-transfer torque. We obtain $α_{CoFeB} = 0.014 \pm 0.003$ and $α_{Py}=0.010 \pm 0.002$, values comparable to measurements for extended thin f…
We present spectral measurements of spin-wave excitations driven by direct spinpolarized current in the free layer of nanoscale Ir20Mn80/Ni80Fe20/Cu/Ni80Fe20 spin valves. The measurements reveal that large-amplitude coherent spin wave modes are excited over a wide range of bias current. The frequency of these excitati…
The orbital contribution to the magnetic properties of Fe in systems of decreasing dimensionality (bulk, surfaces, wire and free clusters) is investigated using a tight-binding hamiltonian in an $s, p,$ and $d$ atomic orbital basis set including spin-orbit coupling and intra-atomic electronic interactions in the full…
Graphite is an example of a layered material that can be bent to form fullerenes which promise important applications in electronic nanodevices. The spheroidal geometry of a slightly elliptically deformed sphere was used as a possible approach to fullerenes. We assumed that for a small deformation the eccentricity of…