Materials Literature
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Mesoporous SBA-15-supported Pd catalyst has been prepared using supercritical carbon dioxide (scCO2). Highly improved dispersion of Pd nanoparticles coupled with favorable mass transport of reactants in the supercritical fluid medium induced a remarkable enhancement of catalytic selectivity for the hydrogenation of 4-…
We studied the transmittance and reflectance of the low-dimensional Mott-Hubbard insulator $\mathrm{TiOCl}$ in the infrared and visible frequency range as a function of pressure. The strong suppression of the transmittance and the abrupt increase of the near-infrared reflectance in the high-pressure range suggest a pr…
We have studied the system $[{\mathrm{Ba}}_{0.6}{\mathrm{Sr}}_{0.4}]$ $[{(\mathrm{Y}\mathrm{Ta})}_{0.03}{\mathrm{Ti}}_{0.94}]{\mathrm{O}}_{3}$, as produced using two different sintering temperatures. It was shown by others that for a sample sintered at $1550\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{…
The effects of Pr substitution in the structure and ferroelectric response for the Sr(1-x)Pr(x)Bi(2)Ta(2)O(9) (SBT-Pr) compound have been studied. Rietveld refinement of the x-ray diffraction patterns indicates that the Pr ion progressively replaces the Sr site in the A 2(1)am space group structure. The solubility of…
Biopolymers are alternative materials used in the production of edible and/or biodegradable films. A very important restriction factor concerning the films is their sensitivity to environmental conditions, such as temperature and relative humidity. The production of films based on gelatin and polyvinyl alcohol blends…
We fabricated a multilayered medium by a laminating process with pressure-sensitive adhesives. It was possible to reduce the thickness variations of both photosensitive layers and transparent layers by applying laminating films. This method is easy to use to pile up many layers for a multilayered medium. We fabricated…
We propose thin single-layer grating waveguide structures to be used as high reflectivity, but low thermal noise, alternative to conventional coatings for gravitational wave detector test mass mirrors. Grating waveguide (GWG) coatings can show a reflectivity of up to 100% with an overall thickness of less than a wavel…
The micro/nanoscaled γ-CuI crystal with various morphologies, such as rose-petal-like nanoflake, prism, triangle, hexagonal pyramid, and polyhedron, was successfully prepared by an in-situ etching process in an ethanol solution. In particular, the morphology and size of the crystals can be controlled by adjusting the…
Microparticles of poly( l -lactic acid) (PLLA), loaded with the antibiotic amoxicillin, have been produced with the SEDS (solution enhanced dispersion by supercritical fluid) process. Encapsulation of amoxicillin in PLLA was initially attempted from a suspension of amoxicillin microparticles in a solution of PLLA in d…
Large-pore mesoporous ethane-silicas functionalized with trans -(1 R,2 R )-diaminocyclohexane were synthesized in an acidic medium by one-step co-condensation of 1,2-bis(trimethoxysilyl)ethane and N -[(trimethoxysilyl)benzyl]-(−)-(1 R,2 R )-diaminocyclohexane using triblock copolymer P123 as template. The postmodifica…
Flexible spacer chains are utilized to enhance the hybridization of terminally anchored oligonucleotide probes of DNA microarrays. A polymer physics approach identifies an underlying mechanism and yields guidelines for the optimal spacer length in terms of the effect on the equilibrium state. For low grafting densitie…
We study the guided self-assembly of symmetric/asymmetric diblock copolymer (BCP) films on heterogeneous substrates with chemically patterned surface by using a coarse-grained phase-separation model. During the procedure, the free energy employed for the BCP films was modeled by the Ginzburg-Landau free energy with no…
Abstract A bottom‐up fabrication route for PbTiO 3 nanograins grown on predefined TiO 2 nanostructures used as seeds is presented. The structuring of the TiO 2 seeds is performed using a self‐organized template constructed from a gold‐loaded micellar monofilm. With this fabrication process, TiO 2 seeds and PbTiO 3 gra…
We report on the time-dependent viscoelastic response of nanoblended films of a polyelectrolyte complex prepared by the multilayering method. The ion-pairing interactions within polyelectrolyte multilayers (PEMUs) are reversibly broken by adding salt to the electrolyte in which the PEMU is immersed. Thus, the bulk mod…
Magnetic transport properties in Ti(1-x)Co(x)O(2) and Zn(1-x)Co(x)O magnetic semiconductors have been studied experimentally and theoretically. A linear relation of lnρ versus T(-1/2) (ρ is sheet resistance and T is temperature), which shows different slopes and intersections at different magnetic fields, was observed…
The precise manipulation of network percolation, combined with the previously reported effects of the kinetics of cross-linking interactions, provide a mechanism by which to optimize the stimulus-responsive mechanical properties of supramolecular gels. Specific metal–ligand coordinative bonds create cross-links betwee…
Abstract Uniform nanocrystalline mesoporous mixed cobalt–nickel spinel phases displaying unimodal pores in the 7–12 nm range and relatively high specific surface areas up to 83 m 2 /g were prepared by a novel low temperature synthesis approach in which the desired metal oxide stoichiometries were introduced on a molec…
The relationship between Pt particle size and NO x storage performance has been investigated over a simple model Pt/BaO/Al 2 O 3 and an enhanced lean NO x trap catalyst (LNT). These catalysts were treated at elevated temperature to mimic the effect of thermal aging encountered during the desulfation step in NO x trap…
Abstract New complexes with guanazole (3,5‐diamino‐1,2,4‐triazole = Hdatrz), [Cu 2 (Hdatrz) 2 (μ‐OH 2 )(H 2 O) 4 (SO 4 )](SO 4 ) · 3.5H 2 O ( 1 ) and [Cu 3 (Hdatrz) 4 (μ‐Cl) 2 (H 2 O) 4 (SO 4 ) 2 ] · 11.4H 2 O ( 2 ), have been prepared and structurally characterized. Complex 1 is a noncentrosymmetric dinuclear compoun…
The synthesis of stable gold nanorods with higher aspect ratios (∼15–20) and more enhanced uniformity by a modified seed mediated growth approach is reported. A binary surfactant system consisting of CTAB and Pluronic F-127 was used to overcome limitations of the previous approach prepared in the presence of AgNO3: th…