Materials Literature
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A theoretical formulation is proposed for forced mass transport by pressure gradients in a liquid binary mixture around a spherical bubble undergoing volume oscillations in a sound field. Assuming the impermeability of the bubble wall to both species, diffusion driven by pressure gradients and classical Fick-diffusion…
We report on the combined use of fluorescence correlation spectroscopy (FCS) and 1H and 13C NMR spectroscopy to detect the size and type of peptide secondary structures in a series of poly-Z-L-lysine functionalized polyphenylene dendrimers bearing the fluorescent perylenediimide core in solution. In dilute solution, t…
Ba(Zr0.2Ti0.8)O3 (BZT) and 2 mol% Mn additional doped BZT (Mn–BZT) thin films were deposited on Pt/Ti/SiO2/Si by the pulsed laser deposition (PLD) technique under the same growth conditions. X-ray diffraction scans showed that both films were polycrystalline and preferentially (1 1 1)-oriented, and an enhanced crystal…
Lead zirconate titanate (PZT) thin films with a composition near the morphotropic phase boundary region were fabricated on the Pt(111)/Ti/SiO2/Si(100) multilayer substrate using sputtering method. An additional annealing treatment was carried out for one minute using a rapid thermal process (RTP) in oxygen atmosphere…
Inductively coupled plasma reactive ion etching of GeSbTe (GST) thin films with a photoresist mask was performed using a HBr/Ar gas mixture. The etch rate of GST films increased up to 20% HBr concentration and began to decrease with further increase of HBr concentration. The etch profiles were improved with increasing…
The correlated $3d$ sulphide $\mathrm{Ba}\mathrm{V}{\mathrm{S}}_{3}$ exhibits an interesting coexistence of one-dimensional and three-dimensional properties. Our experiments determine the electronic band structure and shed light on this puzzle. High-resolution angle-resolved photoemission measurements in a $4\text{\en…
Magnets with composition Sm(CobalFe0.2Cu0.1Zrx)8 (x=0;0.02;0.04;0.06,0.08) were studied using x-ray diffraction Rietveld analysis. In addition to the majority 2:17 and 1:5 phases, the magnets present a rhombohedral (SmZr)1(CoFeCu)3 (PuNi3 structure) phase, whose volume fraction increases with Zr addition. Higher Zr co…
The shock response of the ferroelectric ceramics PZT and PSZT is monitored using maganin stress gauges in longitudinal orientation. Comparison with previously published data shows good agreement between our PZT and similar compositions. A reduction in wave speed below the Hugoniot elastic limit (HEL) with increasing i…
Silicon can be used to destabilize MgH 2 by producing Mg 2 Si and H 2 as products. This process does not appear to be easily reversible. We have used density functional theory to investigate the adsorption and dissociation of H 2 on clean and oxidized Mg 2 Si surfaces as a first step toward understanding the hydrogena…
Iron(II) complexes obtained from tetradentate, rigid, linear N4 ligands have been investigated to appraise the influence of steric effects and the impact of trans-coordinated anions on the spin-transition behavior. As expected, the well-designed ligands embrace the metal center, resulting in octahedral iron(II) comple…
Isolierte Drähte: Eine makrocyclische „Röhre“ sammelt Licht für kovalent gebundene π-konjugierte Polymere, die sie umschließt (siehe Bild). Der multichromophore Polymerkern kann Anregungsenergie akkumulieren, und die hohe intramolekulare Beweglichkeit dieser Anregungen führt zu einer Abhängigkeit der Emissionsdynamik…
Magnetism in bare uncapped gold nanoclusters is explored from a density-functional theory perspective with scalar relativistic effects included via the pseudopotential. The computed electronic structures of various nanoclusters reveal that permanent size-dependent spin polarization appears without geometry relaxation…
We investigate the cohesive energy, heat of formation, elastic constant and electronic band structure of transition metal diborides TMB 2 (TM = Hf, Ta, W, Re, Os and Ir, Pt) in the Pmmn space group using the ab initio pseudopotential total energy method. Our calculations indicate that there is a relationship between e…
Don't forget your coat! Monodispersed Mn3O4 nanoparticles, each encased in a thin shell of MnO2, have been prepared for the first time. Ordered three-dimensional arrays of cubic symmetry were formed by self-assembly (see transmission electron microscope image). The nanoparticles exhibit strong interactions between the…
"Bottom-up" methods to obtain nanocrystals usually result in metastable phases, even in processes carried out at room temperature or under soft annealing conditions. However, stable phases, often associated with anisotropic shapes, are obtained in only a few special cases. In this paper we report on the synthesis of t…
Contrary to conventional wisdom, our purified La 2-2x Sr 1+2x Mn2O7 crystals exhibit CE-type orbital and charge order as the low-temperature ground state for a hole doping level h=0.5. For small deviations from h=0.5, the high-temperature CE phase is replaced at low temperatures by an A-type antiferromagnet without co…
Abstract The effects of tungsten doping in La 2 Mo 2– x W x O 9 samples ( x = 0, 0.1, 0.25, 0.5, 0.75, 1.0, 1.2, 1.4) were studied using dielectric relaxation measurements. Additional to the low‐temperature relaxation peak P d associated with oxygen ion diffusion, a new dielectric loss peak P h was observed around 740…
Abstract Model poly[ethylene‐ block ‐( L , L ‐lactide)] (PE‐ block ‐PLA) block copolymers were successfully synthesized by combining metallocene catalyzed ethylene oligomerization with ring‐opening polymerization (ROP) of L , L ‐lactide (LA). Hydroxy‐terminated polyethylene (PE‐OH) macroinitiator was prepared by means…
The crystal structures, including two new polymorphs, of three diastereomerically related salt pairs formed by (R)-1-phenylethylammonium (1) with (S&R)-2-phenylpropanoate (2), (S&R)-2-phenylbutyrate (3), and (S&R)-mandelate (4) ions were characterized by low-temperature single crystal or powder X-ray diffraction. Ther…
3D nanostructured quasicrystalline materials significantly larger than feasible with previously reported techniques are produced. 2D quasiperiodic surface relief templates with 8mm point group symmetry are made by multiple-exposure interference lithography. Phase-mask lithography with corresponding PDMS masks produce…