Materials Literature
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Abstract Based on previous work a number of optimum extruded blends with high contents of a high barrier ethylene‐vinyl alcohol copolymer were selected and characterized in terms of phase morphology, water sorption and barrier properties. Blend components were an ethylene vinyl‐alcohol copolymer (EVOH with 32 mol% eth…
Cavitation, induced by ultrasound at low frequencies, is an effective means for the disintegration of bacterial cells. Two effects can be observed: at low ultrasound doses bacteria flocs can be declumped by mechanical shear stresses, and at increased doses ultrasound cavitation has an impact on the cell walls such tha…
Molecular orbital calculations for an ErO6 cluster predicted a stable C4v pseudo-octahedron with an Er displacement of ∼0.1 Å from the center of the octahedron with an Er–O bond length of 2.27 Å. In this particular configuration, the hybridization balance of O 2p–Er 6s with O 2p–Er 5d minimizes electron transfer from…
Dendrimers are multibranched compounds exhibiting a well-defined chemical structure with the possibility of encapsulating metal ions or organic molecules in their internal dynamic cavities. When the hosting dendrimer and/or the guest are luminescent, quenching/sensitization processes may occur that can be exploited fo…
Abstract Microstructural changes induced by the microbial reduction of Fe(III) in nontronite by Shewanella oneidensis were studied using environmental cell (EC)-transmission electron microscopy (TEM), conventional TEM, and X-ray powder diffraction (XRD). Direct observations of clays by EC-TEM in their hydrated state a…
Antiferroelectric Pb(Nb,Zr,Sn,Ti)O3 (PNZST) thin films were deposited via a sol–gel process on LaNiO3-buffered Pt/Ti/SiO2/Si substrates. The highly (100)-oriented LaNiO3 buffer layer facilitated the formation of high-quality PNZST films with a strong (100) preferred orientation. These films showed improved electric fa…
Various methods of synthesis of phosphorus dendrimers are presented, in particular a fast method which allows creating each generation in only one step, while multiplying by 5 the number of end-groups. These methods of synthesis can easily be modified to place selectively on the surface, inside, within the branches or…
We have evaluated the surface energy and characterized the wettability of cluster-assembled carbon films deposited on polyethylene, Si and Al substrates by a sessile-drop method using water and glycerol. The effective surface energy of nanostructured carbon is of the order of 30 mJ/m 2 as calculated using the Fowkes a…
Xanthates, thiocarbamates and trithiocarbonates are highly useful compounds in surface and colloid science and in the context of nanotechnology of particles, self-assembly and surfaces. Similar to thiols they have a strong affinity to metal and metal ion-containing surfaces and particles. However they are relatively r…
Galvanostatic tests with pure magnesium and with the AZ91HP alloy were performed in NaCl solutions, and the volume of hydrogen evolved during the tests was measured. In order to examine the negative-difference effect, a concept was developed to separate the hydrogen evolution (H.E.) on the passive surface and the H.E.…
Quantum transport effects in various nanosized graphite sheets are studied on the basis of the Landauer model. To derive heteroatomic effects in quantum transport, nanosized graphite sheets that involve B, N, and O atoms are treated. Important rules for effective quantum transport are found: (I) two atoms connected wi…
Abstract The isothermal crystallization and melting behaviors of poly(propylene carbonate) end‐capped with benzenesulfonyl/poly(vinyl alcohol) (PPC‐BS/PVA) blends over rich PVA composition range were first investigated by differential scanning calorimetry (DSC). PPC‐BS/PVA interaction parameter, χ 12 , calculated from…
Abstract Deflections of semiconductor cluster beams in an inhomogeneous electric field deliver enhanced polarizabilities for cold isolated Ga N As M clusters with odd number of atoms n = N + M up to n =17. One speculated that the high polarizabilities result from their electronic open shell structure. This was qualita…
Banded spherulites of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (P(3HB-3HV)) random copolymer were prepared by isothermal crystallization at 90 °C for 10 h. Using tapping-mode atomic force microscopy (AFM), the concentric periodic ridges and valleys on the surface of the banded spherulites of this polymer were fo…
The preparation of La 0.8 Sr 0.2 MnO 3 (LSMO) films on a LaAlO 3 (LAO) substrate has been investigated by an excimer-laser-assisted coating pyrolysis process (ELACPP) in the temperature range from 350 to 500°C. (00 l ) oriented LSMO films were successfully obtained by ArF laser irradiation at 100 mJ/cm 2 in the substr…
The present review provides a comprehensive survey of the synthesis of carbosilane (CS) dendrimers peripherally functionalized with transition metal fragments or transition metal cluster units.
Ti/Si/TiC powder mixture with molar ratios of 2: 2: 3 were sintered at various temperatures from 700–1300 °C for 15 min by PDS technique. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the evaluation of phase composition in different samples for the understanding of the sintering mechanis…
The thermally induced cationic polymerization of 1,6-anhydro-β- d -mannopyranose ( 1 ) as a latent cyclic AB 4 -type monomer was carried out using 2-butenyltetramethylenesulfonium hexafluoroantimonate ( 2 ) as the initiator. The solution polymerization in propylene carbonate proceeded without gelation to produce the w…
Abstract Compatibilized blends of thermoplastic polyurethane (TPU) and polypropylene (PP) were developed using amine (primary or secondary) functionalized PP's (PP‐g‐NH 2 or PP‐g‐NHR). The strategy of reactive compatibilization is based on fast reactions between amine functional groups and urethane linkages or traces…
The structure and bonding in [TeM 6 O 24 ] 6- (Anderson) and [PM 12 O 40 ] 3- (α-Keggin) heteropolyanions have been investigated by density-functional methods. Various molecular-orbital and population approaches have been employed in the analysis of the structural and electronic properties. Good agreement between comp…