Materials Literature
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Different density iron nanoparticulate substrates were fabricated by thermal vapor deposition in order to study the interactions of fluorophores with iron nanoparticles. We observed metal-enhanced fluorescence (MEF), when fluorophores were placed in close proximity, in the near-field, to the iron nanoparticle deposite…
Abstract A carbonate shortage phenomenon (CO 3 2– /Al < 0.5) was found in MgAl layered double hydroxides (LDHs) withMg/Al < 2 synthesized by the homogeneous precipitation (urea hydrolysis) method. To explain the phenomenon, a “gibbsite‐layer based substitution–filling” model containing octahedral vacancies with…
Purpose The purpose of this paper is to study the phenomenology of Al 2 O 3 -DBC substrate thermal-cracking under different high temperature cyclic loadings. The extremely low cycle fatigue (ELCF) life prediction model for ductile materials was used to describe the thermal fatigue life of Al 2 O 3 -DBC substrates. Des…
Abstract Branched poly(butylene succinate) (PBS) copolymers were synthesized, from succinic acid (SA), 1,4‐butanediol (1,4‐BD), and 1,2‐octanediol (1,2‐OD) through a two‐step process containing esterification and polycondensation, with different mole fractions of 1,2‐OD segments. The branched PBS copolymers were chara…
Photochromic spiropyran molecules were embedded in electrospun polymer microfibers. Electrospinning of a clear viscous chloroform solution containing a spiropyran and a matrix polymer, such as polystyrene and polyethylene oxide, affords polymer microfibers that are photoswitchable. Photomasked, 365 nm UV irradiation o…
Abstract Polyimide–polyaniline nanocomposites were obtained by mixing poly{[4,4′‐bis(4″‐ N ‐phenoxy)diphenylsulfone]imide‐1,3‐bis(3,4‐dicarboxyphenoxy)benzene} (PI) and polyaniline (PANI) solutions in N ‐methylpyrrolidone. These solutions were used for the preparation of homogeneous and composite membranes. Uniform di…
We have prepared and studied the PbF(2):(Yb(3+),Er(3+)) co-doped nanoparticles, with chemical formula (Yb-Er)(x)Pb(1-x)F(2+x), where x = 0.29, Yb(3+)/Er(3+) = 6, and estimated the energy efficiency for their cathodoluminescence, mostly of Yb(3+), and up-conversion photoluminescence of Er(3+) to reach more than 0.5% an…
The electronic structure and relaxation dynamics of a bimetallic monolayer-protected cluster, Au 24 Pd(SCH 2 CH 2 Ph) 18, are investigated with steady-state and femtosecond optical spectroscopies. The central issue examined here is the localization of electronic states to the cluster’s M 13 core and six M 2 (SCH 2 CH…
Abstract Functionalized multiwalled carbon nanotubes (FMWCNTs) were introduced into poly(L‐lactide)/polyethylene glycol (PLLA/PEG) blend and the effects of FMWCNTs on crystallization behaviors, rheological, and mechanical properties of PLLA/PEG/FMWCNTs were investigated. The results show that FMWCNTs exhibit good dist…
We have studied with DFT supercell calculations the role of the charge and of the MgO support in the activation of O 2 by a Au 5 cluster. We considered gas-phase Au 5 and Au 5 − clusters and Au 5 deposited on a stepped MgO surface and on the same surface in the presence of a specific defect, a (H + )(e − ) center. On…
To develop novel bifunctional agents for tumor imaging (MR) and photodynamic therapy (PDT), certain tumor-avid photosensitizers derived from chlorophyll-a were conjugated with variable number of Gd(III)aminobenzyl DTPA moieties. All the conjugates containing three or six gadolinium units showed significant T(1) and T(…
Low-energy electron-diffraction and surface x-ray diffraction data acquired from ${\text{TiO}}_{2}(110)(1\ifmmode\times\else\texttimes\fi{}1)$ are reanalyzed to confirm the integrity of the previously reported optimized geometries. This work is performed in response to ab initio density-functional theory calculations…
Anionic liposomes adsorb onto the surface of spherical polymer particles bearing grafted linear cationic macromolecules. The size, shape, and encapsulation ability of the liposomes remain unchanged upon adsorption, thus providing immobilized self-organizing containers that have potential applications in the biomedical…
An antiferromagnetic (AF) low-moment solution, $0.35{\ensuremath{\mu}}_{\text{B}}/\text{Fe}$, is found in the case of LaOFeAs for an intermediately strong Coulomb interaction $U$ of 2.75 eV. This solution is stabilized over a large moment solution due to the gain in exchange energy in the formation of large multipoles…
Multiwalled carbon nanotubes (MWCNTs) were embedded in electrospun bacterial cellulose (BC) nanofibers, which were prepared using an electrospinning method. In this study, Gluconacetobacter xylinum BRC5 was employed to produce a hydrogel-like bacterial cellulose (BC) sheet. BC was difficult to process in the solution…
We analyse numerically the linear stability of the fully developed flow of a liquid metal in a square duct subject to a transverse magnetic field. The walls of the duct perpendicular to the magnetic field are perfectly conducting whereas the parallel ones are insulating. In a sufficiently strong magnetic field, the fl…
Abstract The structure and properties of binary blends composed of poly(lactic acid) (PLA) and fibrous poly(butylene succinate) (PBS), which were prepared by an uniaxial stretching operation in the molten state, were studied and compared with those of blends having spherical particles of PBS in a continuous PLA phase.…
Abstract The effects of the condenser operation on properties of polyvinyl chloride (PVC) particles produced by suspension polymerization process were investigated in a pilot scale reactor. It was observed that delaying reflux operation increased the cold plasticizer absorption of the final resin. Both bulk density an…
Ab intio static and dynamic calculations show that successive syn -additions of F 2 to the double bonds of graphene resulted in the rehyrbrization of fluorinated carbons. This in combination with steric repulsions between F atoms led to a distortion of the local geometry and severe buckling of the graphene. The weaken…
Abstract This work focuses on the synthesis of a series of silica‐based organic–inorganic hybrid materials, containing different Schiff‐base organic compounds, through a covalent self‐assembly process. We first prepared three functional molecular bridges that can both coordinate to lanthanide ions (Eu 3+ and Tb 3+ ) a…