Materials Literature
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Novel structural microspheres of the Janus type, with microphase-separated polystyrene (PS) and poly(tert-butyl methacrylate) (PBMA) shells and crosslinked poly(2-vinyl pyridine) (PVP) cores, were synthesized with the crosslinking of PVP spherical domains in poly(styrene-block-2-vinyl pyridine-block-tert-butyl methacr…
Amorphous carbon films with an sp3 content up to 25% and a negligible amount of hydrogen have been grown by evaporation of graphite with concurrent Ar+ ion bombardment. The sp3 content is maximized for Ar+ energies between 200 and 300 eV following a subplantation mechanism. Higher ion energies deteriorate the film due…
In this work, the nucleation and crystallization of immiscible blends of poly(propylene) (PP) with ethylene/α-olefin copolymers of different branching contents (Linear Low Density Poly(ethylene), LLDPE, Very Low Density Poly(ethylene), VLDPE, and Ultra Low Density Poly(ethylene), ULDPE) were studied. Melt-mixed blends…
Electron paramagnetic resonance (EPR) and high-resolution fluorescence spectra of ${\mathrm{Nd}}^{3+}$ ions in weakly doped ${\mathrm{LiYF}}_{4}$ and ${\mathrm{YVO}}_{4}$ crystals are analyzed. A simple model, based on an effective spin-Hamiltonian approach is proposed to explain the general features of the EPR and op…
A monodisperse liquid foam is allowed to coarsen while subject to a constant flow of liquid. The average bubble size is indirectly monitored by measurement of the velocity of forced drainage waves. After an initial period the average bubble diameter is found to increase with the square root of time. The rate of this i…
LALP70 is a novel lysosomal membrane protein belonging to the apyrase protein family. The apyrase protein family comprises enzymes capable of cleaving nucleotide tri- and diphosphates in a calcium- or magnesium-dependent manner, not being altered by P-type, F-type, or V-type NTPase inhibitors. In this study we have cl…
The growth rates of four saline-lake diatom taxa were measured under varying conditions of salinity (5, 8 and 11‰), brine type (sulfate- versus bicarbonate-dominated) and nitrogen form (NH4+ versus NO3–), using a full factorial design. With NO3– as the nitrogen source, Cyclotella quillensis, Cymbella pusilla and Anomo…
Low-energy (0.5−30 eV) electron irradiation of the thymine- and halogen-substituted nonamers Au/Cy* 6 T 3 and Au/Cy* 6 (FU,BrU,IU) 3, chemisorbed onto a gold surface, leads to the desorption of neutral CN and OCN from fragmentation of the DNA base ring. No neutral halogen-containing species are detected. The cross sec…
Dendrimers are well defined, highly branched macromolecules that radiate from a central core and are synthesized through a stepwise, repetitive reaction sequence that guarantees complete shells for each generation, leading to polymers that are monodisperse. The synthetic procedures developed for dendrimer preparation…
Scratch damage modes in zirconia‐based ceramics—Mg‐PSZ, Y‐TZP, and Ce‐TZP—are investigated. Precursor indentation tests with a tungsten carbide sphere foreshadow the nature of damage: in Mg‐PSZ, extensive (quasi‐)plastic deformation in the region outside and beneath the contact; in Y‐TZP, less plastic deformation bene…
We present a detailed electromagnetic analysis for the radiation of an electric source located inside grating structures. Our analysis is based on the differential method and uses the scattering-matrix algorithm. We show that gratings that exhibit periodic modulations along two spatial directions (crossed gratings) en…
A water-soluble porphyrin, meso -tetra(4-sulfonatophenyl)porphyrin (TSPP), has been associated with two different polycations, poly(diallyldimethylammonium chloride) (PDDA) and poly(ethyleneimine) (PEI), to investigate the effects of polymer binding upon the TSPP structure and excited-state dynamics both in solution a…
The translational diffusion coefficients of supercooled heavy water ( 2 H 2 O) at atmospheric pressure were examined using pulsed-gradient spin−echo NMR diffusion measurements down to 244 K. At this temperature the diffusion coefficient was 1.67 × 10 -10 m 2 s -1 . The temperature dependence of the 2 H 2 O diffusion w…
The effect of hot‐pressing temperature on the densification behavior and mechanical properties of titanium diboride (TiB 2 ) was investigated. TiB 2 specimens were hot‐pressed for 1 h at temperatures in the range of 1500°–1800°C, with an addition of 2.5 wt% of silicon nitride (Si 3 N 4 ) as a sintering aid. The densit…
H-bonding was used to alter the molecular packing of a bithiazole oligomer. Comparison of the solid-state UV−vis absorption spectra of the H-bonded oligomer with a related non-H-bonded oligomer allowed for the assignment of the optical signature of π stacking in crystals or ordered aggregates of conjugated oligomers o…
High-luminance electroluminescent devices have been newly developed using a Ga 2 O 3 :Mn thin film prepared by a sol-gel process. The sol-gel process, which eliminates the need for vacuum processes, enabled the inexpensive preparation of Ga 2 O 3 :Mn thin films on large-area thick ceramic sheet insulators. Gallium ace…
Voltage-modulated scanning force microscopy has been applied to investigate domain kinetics in triglycine sulfate single crystals, thermally quenched from the paraelectric to the ferroelectric phase. Temporal analysis of the equal-time correlation functions shows that the average domain size grows initially with a pow…
Abstract A series of amorphous fluoro‐polyetherimides based on 2,2′‐bis(3,4‐dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and di‐ether‐containing diamines 4,4′‐bis(3‐aminophenoxy)diphenyl sulfone ( m ‐SED), 4,4′‐bis(4‐aminophenoxy)diphenyl sulfone ( p ‐SED), 4,4′‐bis(4‐aminophenoxy)diphenyl propane (BPADE) were…
Rust formed on weathering steel and that on mild steel were studied by Mössbauer spectroscopy at various temperatures from room temperature to 12 K. The observed spectra were decomposed into the contribution of fine antiferromagnetic particles of α-FeOOH (85 at.%, T N =403 K) and that of γ-FeOOH (15 at.%, T N =73 K).…
A new modification of MnSb 2 S 4 was synthesized by solid state reaction of MnS, and Sb 2 S 3 at 500 °C. The monoclinic, purple-red compound crystallizes in the HgBi 2 S 4 structure type. Single crystal measurements provided the space group C2/m (no. 12) with a = 12.747(3) Å, b = 3.799(1) Å, c = 15.106(3) Å, β = 113.9…