Materials Literature
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A series of 5,5′-diphenyl-2,2′-dithiophene based X-shaped polyphiles with two long lateral alkyl chains and terminal glycerol groups was synthesized and the liquid crystalline phases formed by these compounds were investigated by polarizing microscopy, DSC and XRD. These compounds form square (p4mm and p4gm) and hexag…
Poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) with various PSS composition ratios (α) was synthesized by oxidative polymerization and particle size distribution and zeta potential of the resulting colloidal gel particles were investigated by means of a dynamic light scattering techni…
The self-assembly in aqueous solution of PEG-peptide conjugates comprising a model amyloid peptide sequence FFKLVFF that contains the Aβ(16–20) KLVFF motif is investigated. X-ray diffraction reveals different packing motifs dependent on PEG chain length. This is correlated to remarkable differences in self-assembled n…
The chemomechanical and electrical properties of (Pr , Ce)O 2- thin films were studied between 30 and 875 C in air by in situ X-ray diffraction and complex impedance spectroscopy measurements. Reduction/oxidation reactions produced large stress variations (2 GPa) in the structure. Atomistic simulation techniques were…
Application of pressure on the Cu-complex CuAsp causes Jahn-Teller Cu-O bonds to be compressed, increasing the coordination environment from [4 + 1] to [4 + 2], highlighted by a discontinuity on compression of these bonding interactions.
The dealloying behavior of bi-phase Al–Ag alloys in 5 wt.% HCl in non-treated and magnetic treated conditions was comparatively investigated. The as-dealloyed samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis coupled with SEM. The resu…
Co3O4 nanoparticles have been obtained by stoichiometric combustion synthesis: in particular 4 nitrates-aspartic routes each with different fuel ratio (ranging 0.5-2.5) have been studied. It has been determined through XRD that the crystalline structure present in all obtained powders was the face-centered cubic corre…
Graphene is an allotrope of carbon whose structure is based on one-atom-thick planar sheets of carbon atoms that are densely packed in a honeycomb crystal lattice. Its unique electrical and optical properties raised worldwide interest towards the design and fabrication of future electronic and optical devices with unm…
We report on the facile and switchable alignment of superparamagnetic iron oxide nanoparticles measuring ∼18 nm in diameter in electrospun microfibers. Application of a magnetic field perpendicular to the electric field employed during electrospinning yields polymeric microfibers with nanoparticles aligned in one-dime…
ZnO nanostructures were fabricated on copper substrates by hydrothermal method at an optimized growth temperature of -95 degrees C. Structural properties were investigated by field emission scanning electron and transmission electron microscopy. Distinct morphologies were found to be formed at different growth times.…
Porphyrin containing capsules with light-response were fabricated via Layer-by-Layer (LbL) assembly of two biocompatible polymers, chitosan (CHI) and 5-(4-aminophenyl)-10,15,20-triphenyl-porphyrin (APP) graft polyaspartic acid (PASP-g-APP), on CaCO3 particles. FITC labeled dextran (FITC-Dex) was encapsulated in the co…
The iron(III) μ-oxo bridged dimeric polyoxometalate [(PW(11)O(39)Fe)(2)O](10-) was isolated by reacting the transition metal monosubstituted Keggin anion [PW(11)O(39)Fe(H(2)O)](4-) and the ionic liquid 1-butyl-3-methylimidazolium bromide, (Bmim)Br, at pH 5.5. The crystal structure of (Bmim)(10)[(PW(11)O(39)Fe)(2)O]·0.…
Die castings generally contain a large quantity of porosities due to the entrapment of air or gas in molten metal during mold filling. Although the entrapped air or gas is compressed by high casting pressure during pressurization, it will eventually remain in the castings as defects after solidification. Therefore, it…
We report on an aqueous synthesis of cadmium telluride (CdTe) nanocrystals by using dithiol‐functionalized ionic liquids (dTFILs). The dTFILs were designed to have dithiol and vinylimidazolium functional groups and used as a ligand molecule of CdTe quantum dot (QD) to utilize the bidendate chelate interaction afforded…
A simple nickel bis(dithiolene) complex has been developed as an excellent n-type molecular semiconductor for FETs, with an electron mobility of 0.11 cm(2) V(-1) s(-1) and an on/off ratio of 2 × 10(6) despite its small π-conjugated system. Good FET stability in ambient conditions has also been observed.
The decoupling and enhancement of both Seebeck coefficient and electrical conductivity were achieved by constructing the c-axis preferentially oriented nanoscale Sb(2)Te(3) film on monolayer graphene. The external graphene layer provided a highway for charge carriers, which were stored in the thicker binary telluride…
Poly(ε-caprolactone)-poly(ethylene glycol) (PCL-co-PEG) copolymers have great potential applications in the fields of nanotechnology, tissue engineering, pharmaceutics and medicinal chemistry. In the present work we have developed, for the first time, nanothick, amphiphilic and biodegradable PCL-co-PEG coatings by cat…
Silver nanoparticles aminosilane capped were obtained as stable colloids. FTIR spectrum of these nanoparticles showed a strong interaction between amine groups and silver surface, being this property the source of the high stability of the colloidal particles. UV-visible spectrum showed the typical absorption owing th…
We report an upconverting nanomaterial composition, [Y(2)O(3); Yb (2%), Er (1%)], that converts both X-ray and high-fluence NIR irradiation to visible light. This composition is compared to a higher Yb(3+) doped composition, [Y(2)O(3); Yb (10%), Er (1%)], that displays diminished visible X-ray scintillation, but shows…
Dielectric and pyroelectric studies of lead-free uniaxial relaxor Sr0.75Ba0.25Nb2O6 (SBN75) single crystals have been carried out under different bias field values. E,T-phase diagram has been constructed using these data. Dependences of both the temperature and the height of dielectric permittivity and pyroelectric co…