Materials Literature
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Electrochemical fluorescence switching of electroactive fluorescent anthracene polymer films was studied using an electro active quencher. The fluorescence of a methylene anthracene polymer (PMAn) was intact under redox reaction in the absence of an electroactive quencher. Interestingly the fluorescence of a methylene…
Abstract Silsesquioxanes are formed in situ during mixing and curing of a phenolic resin and a molecular silane precursor (3‐(triethoxysilyl)‐1‐propaneamine) yielding a nanocomposite. As indicated by a higher onset temperature, a higher characteristic decomposition temperature, and a lower maximum heat flow, the therm…
Some physicochemical and mechanical properties of surface hard coatings obtained by the paste-boriding process are summarized in this work. Different grades of borided ferrous alloys were used to develop the formation of surface layers type Fe2B or FeB/Fe2B. Furthermore, in order to characterize the nature of boride l…
Two series of geometrically-related dyads are discussed based on the difluoroborondipyrromethene (Bodipy) unit, and incorporating covalently attached hydroquinone/quinone groups. These units are anchored directly, or via a phenylene spacer, to the Bodipy core at the meso position in one series (BD-MHQ, BD-MQ, BD-MPHQ,…
Abstract Two bisphenols, viz., 4,4′‐[1‐(2‐naphthalenyl)ethylidene]bisphenol and 4,4′‐[1‐(2‐naphthalenyl) ethylidene]bis‐3‐methylphenol were prepared by condensation of commercially available 2‐acetonaphthanone with phenol and o ‐cresol, respectively. A series of new aromatic polyesters containing pendent naphthyl unit…
Double-rough surfaces were prepared by using mixtures of metal oxide nanoparticles with diameters on two different length scales. The degree of double-roughness of these surfaces was controlled using defined ratios of larger (approximately 300 nm) and smaller (approximately 30 nm) particles. If the preparation method…
The interlayer structure and cleavage energy of surfactant-modified clay minerals at the molecular level were determined for 50 different alkylammonium-modified montmorillonites of different cation exchange capacity (CECs of 91 meq/100 g and 143 meq/100 g), head group structure, and chain length using molecular dynami…
We have carried out positron-annihilation spectroscopy to characterize the spatial distribution and the nature of vacancy defects in insulating as-received as well as in reduced ${\text{SrTiO}}_{3}$ substrates exhibiting high-mobility conduction. The substrates were reduced either by ion etching the substrate surfaces…
Metal tetrahydroborates remain interesting materials as potential hydrogen storage media. While overcoming large thermodynamic stability of uni- and divalent metal borohydrides may still be challenging, very little information is available about tetrahydroborates of tri- or tetravalent metal cations. Here, we analyze…
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(…