Materials Literature
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Pulsed-laser deposition has been used to grow epitaxial thin films of the giant-dielectric-constant material CaCu3Ti4O12 on LaAlO3 and SrTiO3 substrates with or without various conducting buffer layers. The latter include YBa2Cu3O7, La1.85Sr0.15CuO4+δ, and LaNiO3. Above 100–150 K, the thin films have a temperature ind…
The excitonic luminescence of an isolated polydiacetylene polymer chain in its monomer matrix is studied by micro-photoluminescence. These chains behave as perfect 1D excitonic systems with the expected 1/sqrt{E} density of states between 5 and 50 K. The temperature dependence of the homogeneous width is quantitativel…
The 2-dimensional angular correlations of the positron annihilation radiation (2D-ACAR) on a single crystal of LaB6 was measured for three projections. The 2D-ACAR spectra were subjected to the Van Citter-Gerhard deconvolution alghorithm. From the experimental spectra we produced the 3D k-space density rho(k) via thre…
We show that oxy-fluoride glass ceramics, with typical composition, 32(SiO2):9(AlO1.5):31.5(CdF2):18.5(PbF2):5.5(ZnF2): 3.5(ErF3) mol % have potential applications in telecommunications. Upon heat treatment, Er3+ nucleates the growth of the nanocrystalline β-PbF2, which acts as its host. Heat treatment at 440 °C for 5…
Dielectric relaxation measurements on a chlorinated biphenyl (PCB62) were carried out over a broad frequency range, with variation of both temperature and pressure. In combination with calorimetric determinations of the configurational entropy, these data could be described using the Adam–Gibbs model. Specifically, th…
Experimental studies have shown that the flow stress of some metals is clearly influenced by superimposed hydrostatic pressure. Flow stress increases with the hydrostatic pressure, and consequently it is often observed that the flow stress is clearly larger in a uniaxial compression test than in a uniaxial tension tes…
We report a study of Nin/TiO2 samples prepared by size-selected deposition of Nin+ (n=1,2,5,10,15) on rutile TiO2(110). The effects of deposition energy and support preparation conditions on the oxidation state of the clusters are examined by x-ray photoelectron spectroscopy (XPS). On the stoichiometric surface, Nin i…
The Cahn–Hoffman capillarity vector thermodynamics for curved anisotropic interfaces is adapted to soft liquid crystalline interfaces. The formalism is used to derive Herring’s capillary pressure equation for anisotropic surfaces, where the role of anchoring energy of liquid crystals is made explicity. It is shown in…
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…