Materials Literature
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Supported Pd clusters catalyze methanol oxidation to methyl formate with high turnover rates and >90% selectivity at near ambient temperatures (313 K). Metal clusters are much more reactive than PdO clusters and rates are inhibited by the reactant O(2). These data suggest that ensembles of Pd metal atoms on surfaces n…
Submicron particles with modified surface were synthesized by a simple one-pot synthesis approach and used as drug carrier for controlled release. Due to the alkalinity of MgO species on the surface, the amount of a model drug, ibuprofen, adsorbed on the modified surface was increased as compared to pure silica SBA-15…
This paper presents a current-transformer (CT) model that is useful for low-frequency applications. To describe the iron-core magnetic behavior, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are repres…
In this work, a method was developed to prepare monodispersed carboxyl-group functionalized magnetic nanoparticles. Nanosized maghemite (y-Fe2O3, 7.0 ± 1.0 nm) was synthesized using thermal co-precipitation method and subsequently coated with functional groups by one-step suspension copolymerization. The Fourier trans…
Ruthenium-embedded carbon nanofibers were prepared by the processes of stabilization, carbonation, and activation after electrospinning a composite solution of ruthenium(III) acetylacetonate and polyacrylonitrile in N , N -dimethylformamide. When Ru particles were embedded in the carbon nanofibers, the average pore di…
Metallic charge-transfer salts of BEDT-TTF containing both racemic (R/S)- and chiral (S)-sec-phenethyl alcohol as guest molecules have been crystallised and their structures and physical properties are compared.
Electrospinning of biopolymers, such as proteins and polysaccharides, has recently attracted much attention for the fabrication of scaffolds for tissue engineering. In this report, zein/hyaluronic acid (HA) blend fibrous membranes were electrospun and characterized. To facilitate the compatibility of zein and HA, poly…
A low-temperature ( 450 – 500 ° C ) gas-phase process for introducing substantial amounts of carbon, without carbide formation, into 316L austenitic stainless steel has been developed. This process, termed low-temperature colossal supersaturation (LTCSS), provides surface carbon concentration as high as 14 atom % and…
A novel LED backlight unit implementing a light guide plate (LGP) with a two-dimensional array of grating micro-dots is proposed. By optimizing grating-vector orientations of local gratings and applying suitable grating-depth modulation in the array, taking into consideration of the radiation pattern of the LED source…
Dynamic quenching of the metal-based excited state of Eu(III) and Tb(III) complexes of sixteen different macrocyclic ligands has been studied. Quenching by urate, ascorbate and selected catechols is most effective for Tb(III) systems, and involves intermediate formation of an excited state complex (exciplex) between t…
A novel family of azobenzene-based photochromic amorphous molecular materials has been created. They were found to readily form amorphous glasses with well-defined glass-transition temperatures and to exhibit photochromism as amorphous films as well as in solution. It was found that their quantum yields of trans–cis p…
Purpose: WE43 is a high-strength magnesium alloy characterized by good mechanical properties both at an ambient and elevated temperature (up to 300°C). It contains mainly yttrium and neodymium. The aim of this paper is to present the results of research on the microstructure of the WE43 magnesium alloy in an as-cast c…
The effect of conditions of preparation on the size and encapsulation properties of PLGA-mPEG nanoparticles of cisplatin was investigated. A modified double emulsion method was applied for the preparation of PLGAmPEG nanoparticles of cisplatin, based on the partial or complete replacement of the water of the inner aqu…
Calcite crystals grown with association of an organic gel matrix led to the generation of a hierarchical, self-similar architecture possessing rhombohedral habit under ambient conditions.
Antineoplastic methotrexate has been loaded through different soaking procedures on silica-based mesoporous materials and, successively, released mimicking an oral administration. The materials were prepared using a self-assembly mechanism in the presence of cationic surfactants with alkyl chain of 16, 12, and 10 carb…
Assembly of an unprecedented [(P(V)Mn(II)W(VI)(11)O(39))2{P(V)O(4)}](13-) and a [P(2)Mn(4)W(18)O(68)](10-) cluster have been observed and structurally characterised and cryospray mass spectroscopic ionization (CSI) has been used to observe one of the very reactive building blocks linking solid state with solution stud…
This paper describes the internal structure of calcite (CaCO3) crystals grown in an agarose hydrogel and demonstrates that the gel-grown calcite crystals, like biogenic calcite crystals, incorporate the organic matrix, resulting in internal structures with pores on the order of 100's of nanometers.
MbtI (rv2386c) from Mycobacterium tuberculosis catalyzes the initial transformation in mycobactin biosynthesis by converting chorismate to salicylate. We report here the structure of MbtI at 2.5 A resolution and demonstrate that isochorismate is a kinetically competent intermediate in the synthesis of salicylate from…
We present a fast computational technique for the electrochemical impedance of solid oxide fuel cells (SOFCs) based on detailed electrochemistry and transport models. The technique is based on the transient numerical simulation of a fast, submicrosecond potential step followed by current relaxation. The impedance is r…
Highly monodispersed thiol-functionalized nanoporous silica spheres with diameters in the submicron range were successfully synthesized via a surfactant-directed co-condensation of tetramethylorthosilicate (TMOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) in a very dilute alkaline methanol–water mixture. The incorpo…