Materials Literature
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Londonite, (Cs,K,Rb) Al 4 Be 4 (B,Be) 12 O 28 , is the Cs-dominant analogue of rhodizite. It occurs with rhodizite at Antandrokomby, a dike of granitic pegmatite in the Manandona valley, Antsirabe region, and at Ampanivana and Antsongombato, in the Betafo region south of Mahaiza, all in Madagascar. Londonite occurs in…
SummaryThe rate at which chloride ions diffuse from archaeological iron into a treatment solution depends on how the chloride ions are initially distributed in the corrosion layer. This paper compares solutions of the diffusion equation for two limiting cases: (1) where the chloride ions are initially spread uniformly…
Inspired by Archaebacterial lipids, transmembrane probes anchor a sensing fluorescent polyene with Ångström resolution deep within a lipid layer. These new bolaamphiphiles are obtained in good yields from a double cross-coupling between esters with a terminal acetylene group and conjugated 1,ω-dihalopolyenes, followed…
The magnetotransport properties of single crystal trilayers 60 Å Co2MnGe/NM/30 Å Co2MnGe where NM is a nonmagnetic spacer material has been studied. The samples were grown by molecular beam epitaxy on GaAs (001) substrates. The 2 to 1 ratios in thickness of the Co2MnGe layers allows for the easy determination of which…
A series of heteroannulenes 3a-f containing four subunits of isoindole, two 1,2,4-triazole moieties, and six aza bridges have been synthesized by dimerization of the corresponding metallated, three-unit intermediates 5a-f. All these 28 pi-electron triazolephthalocyanine derivatives coordinate two metal ions within the…
Abstract Lipophilic folic acid derivatives exhibit lyotropic liquid-crystalline states in organic solvents. The change of the mesophases from lamellar to columnar is induced by the change of specific hydrogen bonding patterns from ribbon to disk with the increase of hydrophobic environment.
Abstract In the paper the production and testing of a prototype smart thermal barrier coating (TBC) consisting of yttria-stabilized zirconia (YSZ) doped with dysprosium is described. The coating was produced using the electron beam physical vapour deposition (EBPVD) technique and consisted of a 180 ím thick layer of Y…
In the probably first successful photon correlation spectroscopy experiment on a crystalline solid, inelastic light scattering of vibrating random-field-pinned domain walls has been observed at subkilohertz frequencies in the uniaxial relaxor ferroelectric Sr(0.61--x)CexBa(0.39)Nb(2)O(6). In the paraelectric relaxor p…
To obtain low field magnetoresistance (MR) in manganites, we have introduced a geometrically constrained magnetic domain wall (DW) in La0.7Sr0.3MnO3 micrometric devices. Nanoconstrictions artificially induced using high resolution e-beam lithography are shown to effectively reduce the DW width leading to strongly enha…
Polycrystalline double perovskites A2FeMoO6 (A=Ca, Sr, Ba) with nanometer-scale grain size have been synthesized using a sol–gel method. The grain size of the samples is controlled within nanometer scale by sintering at different temperatures. The phase purity and the crystal structure of the samples are analyzed by x…
A simple device was recently developed for fast sampling (within a few seconds) of representative melt samples (about 2 g) on a running extruder. An array of such devices has been mounted on a twin-screw extruder. The goal of this study was to de-black-box reactive processing of polymers by studying some typical examp…
We consider the realization and the electro-optical behaviour of a polymer network stabilized liquid crystal whose reflection band has been broadened. We particularly emphasize the reflective properties (mean value of the selective reflection and bandwidth, and the parameters of broadening) and their evolution with vo…
Mechanical activation of monoclinic gibbsite (Al(OH) 3 ) in nitrogen led to the formation of nanocrystalline orthorhombic boehmite (AlOOH) at room temperature. The boehmite phase formed after merely 3 h of mechanical activation and developed steadily as the mechanical‐activation time increased. Forty hours of mechanic…
Pr 1−x Na x MnO 3 solid solutions up to x=0.25 were prepared. Irrespective of magnetic order all samples are electrically insulating. The Curie temperature is maximum at TC=125 K for x=0.15; the samples with x⩾0.2 are charge-ordered antiferromagnets. The x=0.2 antiferromagnetic charge-ordered insulator (AFCO) can be s…
This work deals with a method of analysis which estimates the increase of core losses under sinusoidal and nonsinusoidal inductions. The estimation can be carried out by correlating instantaneous magnetization power (P/sub M/) or the instantaneous magnetic field (H) as a function of the magnetization rate (dB/dt) and…
Anionic self-condensing vinyl polymerization is achieved from an in situ creation of a vinyl monomer bearing an active anion by the reaction of equimolar amount of 1,3-diisopropenylbenzene (DIPB) and butyllithium in THF at 30°C. Onset of the intermolecular-equilibrium between isopropenyl groups (α-methylstyrene) and i…
The abrasion resistance of different wool and blended fabrics is measured with the Martindale wear and abrasion tester, the abrasion kinetics is identified by the shape of the mass loss curve versus abrasion cycles up to yarn breakage. A concave kinetic curve shows a low initial weight loss rate, which continues to in…
To construct an artificial photosynthetic system, peptide dendrimers [n-(X-HLY)PAMAMs: X = R, E; Y= L, F; n=4, 8, 16, 32 and 64 segments], in which amphiphilic alpha-helix peptides (X-HLY: R-HLL, E-HLL and R-HLF) were introduced at the end groups of polyamidoamine dendrimers (PAMAMs), were designed and synthesized. Th…
The de Haas-van Alphen effect in quasi-two-dimensional metals is studied at arbitrary parameters. Oscillations of the chemical potential can substantially change the temperature dependence of harmonic amplitudes that is commonly used to determine the effective electron mass. The processing of the experimental data usi…
The protonic conductivities of SrZr 0.95 M 0.05 O 3 doped with four acceptor ions (M 3+ =Y 3+ , Sc 3+ , Yb 3+ , Er 3+ ) have been studied in the single crystal form. The protonic conductivity is found in four acceptor ions, indicating that protons migrate by hopping from site to site. The Yb-doped crystal has the lowe…