Materials Literature
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The formation of polyaniline (PAni) nanoparticles on silica surfaces has been monitored in situ using evanescent wave cavity ring-down spectroscopy (EW-CRDS). Aniline hydrochloride in aqueous solution at different concentrations was oxidatively polymerized using sodium persulfate. The process was found to involve the…
<div class="htmlview paragraph">A hybrid LNT+SCR system is used to control NOx from a light-duty diesel engine with in-cylinder regeneration controls. A diesel oxidation catalyst and diesel particulate filter are upstream of the LNT and SCR catalysts. Ultraviolet (UV) adsorption spectroscopy performed directly i…
In this work we use ab initio calculations to address the polar behavior of ZnO nanowires. Moving from a description based on Wannier functions, we employ a computational approach that allows one to express the polarization of a nanostructure in terms of local contributions. In particular, we discuss the changes in th…
A facile method has been developed for the fabrication of porous silicon carbide (SiC) by means of sintering a mixture of SiC powder and carbon pellets at a relatively lower temperature, that is, 1450 degrees C, in air. The pore density and the total pore volume of the resulting porous SiC could be tuned by changing t…
A novel strategy is described to study polymer dynamics by using a combination of dielectric spectroscopy and functionalized polymers. The first results are presented using various well-defined, chain-end-functionalized polystyrenes (PS) synthesized using a combination of modern anionic polymerization techniques and h…
Coadsorption of carbon monoxide (CO) and nitric oxide (NO) on the Cu(2)O(111) surface was studied using periodic density functional theory calculations. It is interesting to find that CO+NO on Cu(2)O(111) could react to form adsorbed NCO surface species. Coadsorption of CO and NO could give rise to the formation of a…
A new type of bolaamphiphile bearing bipyrimidine (bpym-8) has been designed and synthesized. The bipyrimidine moiety allows for metal-ligand coordination, thereby influencing the self-assembly of the bolaamphiphile. Before coordination, bpym-8 self-assembles in water to form spherical aggregates. An interesting findi…
In this work, the pitting corrosion resistance of welding duplex stainless steel 2205 was studied. Joints were made using the GMAW process with different fillers: duplex ER 2209 and two austenitic fillers (ER 316LSi and ER 308LSi). The microstructure obtained with the duplex ER 2209 filler is similar to the duplex 220…
We report results from fully atomistic molecular dynamics simulations of commercially available aliphatic hydroxyl-terminated hyperbranched polyesters of two different architectures/sizes in the bulk, exploring dynamic mechanisms associated with their physical behavior as it has been described by pertinent experimenta…
We report a one-pot synthesis of silver nanoparticle-polymer composites (Ag-PNCs) in water by a novel finding involving the polycondensation of methoxybenzyl chlorides (MeO-BzCl) directly on Ag nanoparticle surfaces at room temperature, leading to highly soluble antimicrobial nanocomposites. The composites, which are…
Abstract An all‐inorganic complex, [Mn 2 {(VO 3 ) 5 } 2 ] 6– ( 1 ), was synthesized, and the structure determination reveals a dinuclear manganese complex coordinated by two cyclic pentavanadate ligands. The cyclic pentavanadate units sandwich the edge‐sharing octahedral dimanganese core through coordination of the ox…
Serine hydroxymethyltransferase is a pyridoxal 5'-phosphate-dependent enzyme that catalyzes the interconversion of serine and glycine using tetrahydropteroylglutamate as the one-carbon carrier. In all pyridoxal phosphate-dependent enzymes, amino acid substrates are bound and released through a transaldimination proces…
Structural properties of mixed-alkali borate glasses, $0.3[(1\ensuremath{-}x){\text{Li}}_{2}\text{O-}x{\text{Cs}}_{2}\text{O}]\ensuremath{-}0.7{\text{B}}_{2}{\text{O}}_{3}$ and $0.3[(1\ensuremath{-}x){\text{Li}}_{2}\text{O-}x{\text{Na}}_{2}\text{O}]\ensuremath{-}0.7{\text{B}}_{2}{\text{O}}_{3}$, have been studied by m…
We investigate the effective material properties of a multiferroic fibrous nanocomposite with size effects along its interface. The closed-form expression of the effective moduli of the nanocomposite shows that its response with interface effects depends on the size of the embedded fibers in the composite, a phenomeno…
To gain insight into segmentation processes, the expression at embryonic stages of the silkmoth Bombyx mori homologues of even-skipped (eve), engrailed (en), caudal (cad), and wnt1/wingless (wg) transcripts were examined by whole mount in situ hybridization. Pair-rule eve stripes and segmental en and wnt1/wg stripes w…
Abstract In this study, we are introducing a new class of Polyurethane (PU) nanofibers containing silver nanoparticles (NPs) by electrospinning. A simple method not depending on the addition of foreign chemicals has been used to self‐synthesize of silver NPs in/on PU nanofibers. Typically, a sol−gel consisting of AgNO…
Abstract Conventional and chain extended‐modified solid‐state polymerization (SSP) of postconsumer poly(ethylene terephthalate) (PET) from beverage bottles was investigated. SSP was carried out at several temperatures, reaction times, and 2,2′‐bis‐2‐oxazoline (OXZ) or pyromellitic anhydride (ANP) concentrations. The O…
Metal-ion-induced self-assembly in aqueous solution of the rigid ligand 1,4-bis(2,2′:6′,2′′-terpyridine-4′-yl)benzene ( 1 ) with Fe(OAc) 2 and Ni(OAc) 2 is investigated with viscosimetry, SANS, and AFM. Ligand 1 forms extended, rigid-rod like metallo-supramolecular coordination polyelectrolytes (MEPEs) with a molar ma…
Sheaflike terbium phosphate hydrate hierarchical architectures composed of filamentary nanorods have been fabricated by a hydrothermal method. The X-ray diffraction patterns and thermogravimetric/differential thermal analysis investigations reveal that the obtained terbium phosphate hydrate has a structural formula of…
We investigate the dependence of the electrical resistivity and magnetoresistance of single crystalline micrometer-sized graphite samples of a few tens of nanometers thick on the defect concentration produced by irradiation at low fluences. We show that the carrier density of graphite $n$ is extremely sensitive to the…