Materials Literature
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Sixth-generation poly(amidoamine) (PAMAM) dendrimers have been used to explore methods for immobilizing Pd nanoparticles on atomically flat surfaces. Two methods are investigated. In the first method, dendrimer-encapsulated metal nanoparticles (DEMNs) are prepared using a PAMAM dendrimer with hydroxyl terminal groups.…
A series of hemicyanine dimers, (B3, B5, and B12) whose two chromophores are linked by different numbers of methylene groups, are synthesized. Negative slovatochromic behaviors are observed, and the fluorescence quantum yield is sensitive to the polarity of solvent. In chloroform, the fluorescence intensity is much mo…
Automated systems for electrochemical synthesis and high-throughput screening of photoelectrochemical materials were developed and used to prepare tungsten-based mixed-metal oxides, W(n)O(m)M(x) [M = Ni, Co, Cu, Zn, Pt, Ru, Rh, Pd, and Ag], specifically for hydrogen production by photoelectrolysis of water. Two-dimens…
Emulsion-templated polymer beads have been prepared by oil-in-water-in-oil (O/W/O) sedimentation polymerization. The materials exhibit well-defined macropore structures (2−15 μm) and high pore volumes (up to 8 cm3/g). The beads have monodisperse size distributions (<3%) because the droplets are isolated from one anoth…
We have measured the transport spin-polarization of epitaxial thin films of the conductive ferromagnetic oxide, SrRuO3, using Point Contact Andreev Reflection Spectroscopy (PCAR). In spite of the fact that spin-up and spin-down electronic densities of states at the Fermi level for SrRuO3 calculated from band structure…
The glassy paramagnetic Meissner phase of a Bi$_2$Sr$_2$CaCu$_2$O$_x$ superconductor ($x$ = 8.18) is investigated by squid magnetometry, using ``dc-memory'' experiments employed earlier to study spin glasses. The temperature dependence of the zero-field-cooled and thermo-remanent magnetization is recorded on re-heatin…
Hollow microcapsules comprised of poly(styrenesulfonate) (PSS) and a fourth generation poly(amidoamine) dendrimer (4G PAMAM) were prepared by depositing PSS/4G PAMAM multilayers on melamine formaldehyde (MF) colloid particles by the layer-by-layer self-assembly technique and subsequently dissolving the templated cores…
CdSe nanorods and dendritic fractals were synthesized through a novel controllable solution-phase hydrothermal method. Soluble selenite was employed to provide a highly reactive Se source in the synthesis. Both morphologies and phases of the CdSe products could be successfully controlled by choosing appropriate comple…
A survey of recent experimental results is given, presenting the growth of oxide epitaxial thin films in P − T − x conditions, which are far from those necessary for the existence of corresponding phases in a bulk state. The unstable in bulk BaCu 3 O 4, NdMn 7 O 12, RNiO 3, and unusual polymorphous forms of BaRuO 3, R…
The perturbation method for the analysis of thin, manifestly deformed films is given. The application of the method the excitons in the film has shown that those have the effective mass essentially depending on the propagation direction. The effects of a mechanical deformation of the film were investigated. It was con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Tolerant Solid Acid CatalystsToshio OkuharaView Author Information Graduate School of Environmental Earth Science, Hokkaido University, Sapporo 060-0810, Japan Cite this: Chem. Rev. 2002, 102, 10, 3641–3666Publication Date (Web):September 7, 2002Publication History Rec…
Deposition of molecular contamination onto spacecraft surfaces changes the thermo-optical and electrical properties of those surfaces. Such changes may induce changes in the properties and performance of other spacecraft systems. Interactions with space environments may continue to change the nature of contaminant spe…
The effect of saturation of polydienes with varying microstructures on the phase behavior of poly(vinylcyclohexane) (PVCH)/poly(ethylene- co -1-butene) (PEB) and PVCH/poly(ethylene- alt -propylene) (PEP) blends was investigated. For the study, a series of polyisoprenes (PI) and polybutadienes (PB) with varying microst…
PZT(Zr:Ti=52:48) ceramics can be modified by Gd 3+ , giving compositions Pb 1-x Gd x - ( Zr 0.52 Ti 0.48 )1-x/4 O 3 with x = 0.00, 0.01, 0.5, 1, 2, 6 and 10 mole percent. X-ray diffraction patterns show that all PGZT samples are of tetragonal structure and the highest doping should be no more than 2 mole percent Gd at…
A two‐fluid, computational fluid dynamics study of the phenomena of bubble collapse under a submersed flat plate has been performed. In order to handle the rapidly changing bubble‐water interface accurately, second order upwind differencing is used in calculating the advection term. Good agreement with experimental da…
We present exact numerical results indicating that ionization could be a useful tool to study electron correlations in artificial molecules and nanoarrays of metallic quantum dots. For nanorings consisting of Ag quantum dots of the type already fabricated, we demonstrate that the molecular orbital picture breaks down…
Since natural blood vessels are lined with an endothelial cell (EC) monolayer, it is proposed that synthetic biomaterial surfaces be covered or seeded with endothelial cells for ideal nonthrombogenicity under normal conditions. The effects of the surface energy of hydrophilic-hydrophobic IPN on EC adhesion and growth…
We report a new method to control both the nucleation and growth of polypyrrole (Ppy) for the formation of the patterns from micrometer to nanometer sizes using adsorbed sodium dodecyl sulfate bilayers as a molecular mask. Polystyrene (PS) and poly(4-vinylpyridine) blend and block poly(styrene- b -4-vinylpyridine), wh…
The two main goals of the current work are: (i) to test the effects of Proton Sponge as a H + scavenger and (ii) to test and rank the relative efficacy of the anions (Y - ) listed below for their relative ability to allow the formation, stabilization (including isolability), high catalytic activity, and long catalytic…
Nanometre-size cobalt columns with tilt angle ranging from ∼0 º to ∼40 º and fixed density on Si(100) were fabricated by combining oblique-angle physical evaporation with controlled substrate motion. The column tilt angle can be controlled by the speed and phase of substrate rotation in addition to the angle of the in…