Materials Literature
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A methodology that takes into account the (n,m) structure of single-walled carbon nanotubes (SWNTs), through an exciton-exciton resonance model and an electron-phonon interaction model, was employed in order to evaluate the semiconducting (n,m) abundance of two SWNT samples (i.e., Co-MCM-41 and HiPco). This was based…
We have developed a method based on melt coaxial electrospinning for fabricating phase change nanofibers consisting of long-chain hydrocarbon cores and composite sheaths. This method combines melt electrospinning with a coaxial spinneret and allows for nonpolar solids such as paraffins to be electrospun and encapsulat…
The chemical composition, anatomical characteristics, lignin distribution, and cell wall structure of oil palm frond (OPF), coconut (COIR), pine-apple leaf (PALF), and banana stem (BS) fibers were analyzed. The chemical composition of fiber was analyzed according to TAPPI Methods. Light microscopy (LM) and transmissio…
Polyimide (C22H10N2O5, PMDA-ODA, Kapton-H) samples were doped with phosphorous or boron and fluorine using the radiation assisted diffusion technique, with Co-60 gamma-rays over the dose range ~64–384 kGy, at room temperature. The diffusion of phosphorus and fluorine was confirmed by the RBS technique and that of boro…
Arbeiten unter Druck: BiB3O6 ist ein bekanntes Material mit nichtlinearen optischen Eigenschaften. Unter Einsatz von Hochdruck/Hochtemperatur-Bedingungen gelang nun die Synthese eines neuen nicht-zentrosymmetrischen Bismuttriborates (δ-BiB3O6). Die Abbildung zeigt einen Sechserring in der Kristallstruktur von δ-BiB3O6…
We present a group theoretical analysis of several classes of organic superconductor. We predict that highly frustrated organic superconductors, such as κ-(ET)(2)Cu(2)(CN)(3) (where ET is BEDT-TTF, bis(ethylene-dithio)tetrathiafulvalene) and β'-[Pd(dmit)(2)](2)X, undergo two superconducting phase transitions, the firs…
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…