Materials Literature
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Single crystals of warwickite, trimagnesium titanium(IV) dioxide bis-(borate), Mg(3)TiO(2)(BO(3))(2), were prepared by slow cooling of the melt. The title compound is isotypic with Co(3)TiO(2)(BO(3))(2). In contrast to the previous refinement of warwickite [Moore & Araki (1974 ▶). Am. Mineral.59, 985-1004], that repor…
In this paper, wettability behavior of a rough but intrinsically hydrophilic oxide ceramic, formed via simple thermal oxidation of a commercial metallic alloy in laboratory air, has been analyzed. Drop shape analysis (DSA) revealed static water contact angles for the rough ceramic surfaces up to 128° (greater than for…
Manganese doped cadmium ferrites (Cd1-xMnxFe2O4, x=0, 0.25, 0.5, 0.75, 1) were studied by using ab initio calculation based on generalized gradient approximation (GGA). The dependence of electronic structure and magnetic properties on the additional on-site Coulomb repulsion (U) was investigated. In the calculation, n…
The field lines of energy flow of the radiation emitted by a linear dipole in free space are straight lines, running radially outward from the source. When the dipole is embedded in a medium, the field lines are curves when the imaginary part of the relative permittivity is finite. It is shown that due to the damping…
High-performance millimeter-wave absorber composed of ε-AlxFe2-xO3nanomagnets is prepared by sol-gel techniques. Free space quasi-optical spectrometer equipped with a set of tunable backward-wave oscillators as power sources is used in this work to study the absorption property of this series of materials. Special alu…
The surface potential variations on ZnO nanocrystal surfaces were investigated by using Kelvin probe force microscopy. It was found that the nanocrystal surface contains randomly distributed circular pits with a diameter of ∼100 nm and a depth of ∼30 nm and that the surface potential within the pits is lower than that…
Abstract The preparation of high‐ T g transparent polymers from poly(ether sulfone)s with bulky phosphinate pendants is described. Poly(ether sulfone)s P1–P3 based on biphenylene phosphinate‐substituted bisphenols were prepared. The thermal properties of P1 and P2 were studied and compared with a bisphenol‐A‐based pol…
Shape memory alloy (SMA) elements embedded in a structure allow to control the structural properties, thanks to their coupled thermo-mechanical behavior. In this study, the manufacturing and the shape control abilities of glass fiber/polyester resin SMA hybrid composites (SMAHCs) were experimentally investigated. Mech…
We report a method for modulating the physicochemical properties of surfaces that is based on the reactive layer-by-layer fabrication of covalently crosslinked thin films using azlactone-functionalized copolymers. We demonstrate that copolymers containing different molar ratios of methylmethacrylate (MMA) and 2-vinyl-…
4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) derivatives were prepared and their photochemical properties were characterized. One such analogue, 4,4-difluoro-4-bora-1,3,5,7-tetramethyl-8-(5-hydroxypentyl)-3a,4a-diaza-s-indacene was transformed into the corresponding phosphoramidite and incorporated into oligode…
We analyze the C(p)-T data for the glassy state of eight materials of varied molecular interactions and structures to investigate how the use of the C(p)d ln T integral in the time-dependent (nonreversible) thermodynamic path between a liquid and glass affects our estimates of the entropy. Since the change in entropy…
From the earliest years of ferrite development, spin-lattice interactions from select transition-metal (3dn) and rare-earth (4fn) ions have influenced key parameters of microwave device performance. Hysteresis loop squareness and coercivity, and magnetic loss that is related to the ferrimagnetic resonance linewidth wi…
High-Q sapphire quasi-optical dielectric resonators (QDRs) excited on whispering-gallery modes are key techniques for accurate characterization in millimeter (mm) wavelength range of surface impedance of HTS large-area films and can be useful for impedance characterization of small HTS single crystals, including vario…
The search for technologically and economically viable storage solutions for hydrogen fuel would benefit greatly from research strategies that involve systematic property tuning of potential storage materials via atomic-level modification. Here, we use first-principles density-functional theory to investigate theoreti…
Abstract In order to fabricate a new polymer matrix for application in biochips and to understand the mechanism of adsorption of proteins on conducting polymers, we prepared polypyrrole (PPy) functionalized with ω‐( N ‐pyrrolyl)‐octylthiol moieties. The chemical structure of the polymer could be controlled by varying…
A new PHEA-IB-PMANa(+) copolymer has been synthesized and its pH-induced self-assembly has been investigated in an aqueous medium. PHEA-IB-PMANa+ formed nanoparticles with diameters from 25 to 50 nm upon protonation of the carboxylic acid moieties dislocated along the grafted polymethacrylate sodium salt side chains.…
A versatile scheme for the preparation of nanoparticle (NP) multilayers is presented. The method is based on the step-by-step assembly of NPs and bishydroxamate disulfide ligand molecules by means of metal-organic coordination using easily synthesized tetraoctylammonium bromide (TOAB)-stabilized gold NPs. The assembly…
At the heterointerface of a top ferroelectric Pb(Zr${}_{0.2}$Ti${}_{0.8}$)O${}_{3}$ (PZT) ultrathin film and a bottom La${}_{0.7}$Sr${}_{0.3}$MnO${}_{3}$ (LSMO) electrode, we used continuous synchrotron-radiation photoelectron spectroscopy to probe in situ and demonstrated that the interfacial charges are reversible a…
Imaging with a spherical mirror in empty space is compared with the case when the mirror is filled with Maxwell’s fish eye medium. Exact time-dependent solutions of Maxwell’s equations show that perfect imaging is not achievable with an electrical ideal mirror on its own, but it is with Maxwell’s fish eye in the regim…
Abstract Condensation and subsequent reduction of 2,2′‐diaminobiphenyls 5 with 6′‐ and 5′‐substituted 6‐carbaldehyde‐2,2′‐bipyridines 4 yielded N , N′ ‐bis(2,2′‐bipyridine‐6‐ylmethyl)‐2,2′‐biphenyl‐enediamines 7 , which were employed as hexadendate ligands with N6 donor sets in the synthesis of dicationic [Fe 2+ ( 7 ‐…