Materials Literature
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We describe the synthesis and the swelling behavior of a weak polyacid brush attached to a solid surface. Monolayers of poly methacrylic acid are generated by using self-assembled monolayers of an azo initiator and radical chain polymerization of methacrylic acid monomer at the surface of a planar substrate in situ. T…
Using angle-resolved photoemission, we have investigated the development of the electronic structure and the Fermi level pinnning in Ga$_{1-x}$Mn$_{x}$As with Mn concentrations in the range 1--6%. We find that the Mn-induced changes in the valence-band spectra depend strongly on the Mn concentration, suggesting that t…
It is shown that small inclusions of a low absorbing metal can have a dramatic effect on the photonic band structure. In the case of diamond and zinc-blende photonic crystals, several complete photonic band gaps (CPBG's) can open in the spectrum, between the 2nd-3rd, 5th-6th, and 8th-9th bands. Unlike in the purely di…
Stilbazolium dimers were designed and synthesized in which methylene groups of different lengths link the two chromophores. The second-order nonlinear optical property has been detected from their Langmuir−Blodgett monolayers. Photocurrent generation as well as other photophysical properties such as absorption and flu…
A novel example of the self-assembling capabilities of semifluorinated n -alkanes is presented: nanoscale periodic structures were revealed in mixed Langmuir−Blodgett films of a semifluorinated n -alkane with a polystyrene−poly(ethylene oxide) diblock copolymer by atomic force microscopy. The surface structures, resem…
The advantages of polymers are the fabrication and patterning of ultra-large-area coatings. In this paper, an approach which combines self-assembled polyelectrolytes, ink-jet printing, and electroless metal plating technologies for the fabrication of vertically integrated electronic circuits is successfully demonstrat…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Characterization of Dodecanethiol-Capped Cadmium Sulfide Nanoparticles in a Winsor II Microemulsion of Diethyl Ether/AOT/WaterR. B. Khomane, Abhijit Manna, A. B. Mandale, and B. D. KulkarniView Author Information Chemical Engineering Division, and Materials Chemis…
Toward designing nonbiological polymers that fold into predictable tertiary structures, we report a "beta-oligomer" composed of beta-amino acids that adopts a cooperatively folded structure. We have computationally designed a C(2)-symmetrical pair of interacting 14-helical beta-oligomers stabilized via long-range inte…
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…