Materials Literature
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Abstract The aim of the present study was to investigate feedback control of a reactive crystallization process. The present study built up a control structure needed to control the driving force of reactive crystallization using the feed rate of added acid. The concentration of the crystallizing compound and pH was u…
The widths of the valence bands in the copper (I) delafossites ${\text{CuGaO}}_{2}$, ${\text{CuInO}}_{2}$, and ${\text{CuScO}}_{2}$ have been measured by $\text{O}\text{ }K$-shell x-ray emission spectroscopy and are compared with previous experimental work on ${\text{CuAlO}}_{2}$ and ${\text{CuCrO}}_{2}$. In agreement…
Herein we demonstrate a simple but versatile bioinspired polyamine-catalyzed silicification route to synthesizing functional materials which is monodisperse, mesoporous, and spherically uniform having nanosizes under extremely mild conditions similar to the biosilicification processes. Employing the principles learned…
Within a two-band model for the recently discovered ferropnictide materials, we calculate the thermal conductivity assuming general superconducting states of ${A}_{1g}$ (``$s$-wave'') symmetry, considering both currently popular isotropic ``sign-changing'' $s$ states and states with strong anisotropy, including those…
Missing in action: Relativistic density-functional methods provide a reliable framework to predict the features of 195Pt, 183W, and 17O NMR spectra of terminal oxo Pt and Au complexes (see picture for [P2W20O70Au(O)(OH2)3]9−; Au yellow, W blue, P orange, O red, H white). The complexes have an extremely small HOMO–LUMO…
The assembly mechanism by which hundreds of thousands of two-segment gold-polypyrrole nanorods are assembled into kinetically controlled shape-directed superstructures is examined to predict the range of nanoparticle sizes and materials that can be utilized in their formation. Four processes are responsible for assemb…
Three functional bidentate aryl phosphine oxide (APO) derivatives characterized by two diphenylphosphine oxide moieties [2-(diphenylphosphoryl)- N -(2-(diphenylphosphoryl)-4-methoxyphenyl)-4-methoxy- N -(4-methoxyphenyl)aniline (TMOADPO), 3,6-bis(diphenylphosphoryl)-9-ethyl-9 H -carbazole (EtCzDPO), and 3,6-bis(diphen…
New catalyst systems for diyne polycyclotrimerization were developed. E -1-[2-(2,5-Diethynylphenyl)vinyl]ferrocene ( 1 ), a ferrocene-containing diyne, was polymerized by ruthenium- and rhodium-based catalysts, affording hyperbranched polyphenylenes ( hb -P 1 ) with high molecular weights ( M w up to ∼1.4 × 10 5 ) in…
By sequential growth of the core and shell of different materials, ZnO/ZnS and ZnO/MgO core/shell nanowire arrays are fabricated. Photoluminescence properties of these samples with different shell thicknesses are studied in detail. The results indicate that the ZnS shell thickness as a function of treatment time will…
Group 14 metal complexes of heavy chalcogen-centered anions, M[(TeP(i)Pr(2))(2)N](2) (5, M = Sn; 6, M = Pb) and M(TeP(i)Pr(2)NP(i)Pr(2)Se)(2) (7, M = Sn; 8, M = Pb), were synthesized in 64-89% yields by metathesis of alkali-metal salts of the ligands with group 14 metal dihalides. Crystallographic characterization of…
Soft lithographic techniques augment or enhance the capabilities of traditional patterning processes and expand the diversity of materials that can be patterned. Realization of robust parallel techniques for creating chemical patterns at the nanoscale has been challenging. Here we present a method for creating and rep…
Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays with ultrasharp tips ( approximately 4 nm) enabled by the Ni catalyzed vapor-solid-solid growth process. Ge nanoneedle arrays…
Using p-MBRS experiments and TPR as well as FTIR measurements, it could be shown that dissociative oxygen activation occurs in the same temperature range for small clusters in comparison to faceted nanoparticles (NPs) and Pd single crystals. Surprisingly, CO poisoning does not take place on small Pd clusters at temper…
Colloidal TiO 2 nanorods were synthesized with different aspect ratios and successfully doped with copper via a controlled hydrolysis method. Inductively coupled plasma (ICP) atomic emission spectroscopy analyses showed that the as-prepared TiO 2 nanorods contained ∼1.7−3.2 at% Cu. X-ray diffraction (XRD) and high-res…
Abstract Chiral Jacobsen’s catalyst was axially immobilized onto phenoxy‐modified zirconium poly(styrene‐phenylvinylphosphonate)phosphate (ZPS‐PVPA). The immobilized catalysts show comparable ee values for asymmetric epoxidation of styrene and much higher ee values for α‐methylstyrene (73.7% vs. 54.0%) and indene (99.…
Hierarchically porous silica materials have been synthesized through a confinement self-assembly approach in the skeletal scaffolds of commercial polyurethane (PU) foams. Macroporous/mesoporous silica materials with a well-ordered two-dimensional (2-D) hexagonal ( p 6 mm ) mesostructure have been synthesized in an aci…
Hydrothermal reactions of lanthanide(III) chlorides with 4-HOOC-C(6)H(4)-CH(2)NHCH(2)PO(3)H(2) (H(3)L) at different ligand-to-metal (L/M) ratios afforded nine new lanthanide(III) carboxylate-phosphonates with two types of 3D network structures, namely, LnCl(HL)(H(2)O)(2) (Ln = Sm, 1; Eu, 2; Gd, 3; Tb, 4; Dy, 5; Er, 6)…
Organic compounds isolated from diatoms contain long-chain polyamines with a propylamine backbone and variable methylation levels and chain lengths. These long-chain polyamines are thought to be one of the important classes of molecules that are responsible for the formation of the hierarchically structured silica-bas…
Following on from our previous investigations, fluorescent core/shell CdTe@SiO 2 particles were prepared via the water-in-oil (W/O) reverse microemulsion method. It was found out that incubating the as-prepared aqueous CdTe quantum dots stabilized by thioglycolic acid in ammoniacal solution not only increased the fluo…
Following an extremely interesting idea \cite{R1}, published long ago, the work function at the outer crust region of a strongly magnetized neutron star is obtained using relativistic version of Thomas-Fermi type model. In the present scenario, the work function becomes anisotropic; the longitudinal part is an increas…