Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Silicon nanocone arrays are formed on porous silicon substrates by plasma etching in a hot filament chemical vapour deposition system. The as-formed Si nanocones were characterized by means of scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive x-ray analysis, and Raman sp…
Oberflächenveredelung mit Glycerin: Ein hoch viskoser Glycerin-Elektrolyt verhindert lokale Konzentrationsunterschiede und pH-Schwankungen beim Anodisieren von Titan. So entstehen Schichten von glattwandigen TiO2-Nanoröhren mit bis 7 μm Porenlänge und durchschnittlich 40 nm Durchmesser (siehe Transmissionselektronenmi…
[structures: see text] Novel macrocyclic and medium-size stilbenophanes tethered by silyl chains were synthesized, and their photochemical and photophysical properties were examined. Direct photoirradiation of macrocyclic stilbenophanes gave intramolecular photocycloadducts stereoselectively, and the efficiency increa…
Abstract An original modification of the standard Pulse Laser Deposition (PLD) method for preparing both undoped and indium doped zinc oxide (ZnO:In) thin films at low substrate temperature is proposed. This preparation method does not demand any further post‐deposition annealing treatment of the grown films. The deve…
The effects of feed composition on the conversion of CO and CO2, selectivity to DME, yield of DME and product distribution are studied in the synthesis of DME from syngas and from (H2+CO2) in a single reaction step using the bifunctional catalysts CuO-ZnO-Al2O3/gamma-Al2O3 and CuO-ZnO-Al2O3/NaHZSM-5. For feeds made up…
Two coordination polymers formulated [Fe(pmd)2[Ag(CN)2]2] (pmd = pyrimidine) have been synthesized and characterized. Both polymers, considered to be architectural isomers, display different crystal structures and magnetic properties. Isomer 1 crystallizes in the monoclinic C2/c space group with a = 6.9750(8) angstrom…
Abstract The magnetic properties of the isotropic ( J rail ≈ J rung ), two‐legged spin‐ladder bis(2‐amino‐5‐nitropyridinium) tetrabromocuprate monohydrate, [(5NAP) 2 CuBr 4 · H 2 O], have been studied using a first‐principles, bottom‐up approach, which allows computation of macroscopic magnetic properties (for instanc…
Abstract A series of SiPW‐X mesoporous silica with Keggin‐type heteropolyacids (HPAs) encapsulated into their framework have been synthesized under strong acidic conditions. During hydrolysis of tetraethyl orthosilicate (TEOS), Na 2 HPO 4 (P source) and Na 2 WO 4 (W Source) are added into the initial sol‐gel system to…
Sei kein Frosch! Nanokristalle aus Cerdioxid mit einheitlicher Größe und sphärischer, drahtförmiger oder Kaulquappen-förmiger Gestalt wurden aus einer nichthydrolytischen Sol-Gel-Reaktion von Cer(III)-nitrat und Diphenylether in Gegenwart geeigneter Tenside erhalten. Im Bild sind TEM-Aufnahmen von Kaulquappen-förmigen…
In the current paper, we report a facile template-free route for ‘mass production’ of ZnS hollow spheres with nano- and submicro-sizes, employing thiocarbamide, (CH 3 COO) 2 Zn·2H 2 O and water as the raw materials. ZnS hollow spheres were obtained via hydrothermal reaction at 140 °C for 5 h. XRD analysis showed that…
Abstract We study crystal nucleation within an ensemble of polyethylene droplets created through the dewetting of a thin film on an unfavorable substrate. In particular, we employ standard thermal treatment procedures to induce self‐nucleation in samples to gain some insight into the nature of this enhanced crystalliz…
Abstract The mechanism of ultraviolet (UV), violet and blue green emission from ZnO:Al (AZO) thin films deposited at different radio frequency (r.f.) powers on glass substrates was investigated. The structure and surface morphology of AZO films have also been observed. The optical transmittance spectra shows more than…
Abstract A novel chemical reduction route was designed for the synthesis of nickel nanocrystals with distinct flowery shapes by using a mixture of two complexes of Ni(N 2 H 4 ) 3 2+ and Ni(dmg) 2 (nickel dimethylglyoximate) as the nickel source. Formation of these flowers, comprising spherical centers and swordlike pe…
We introduce a novel method of inorganic synthesis using the catalytic and structure-directing properties of the demosponge enzyme silicatein-alpha. Recombinant silicatein-alpha was displayed at the surface of Escherichia coli cells by fusion to outer membrane protein A and used to biocatalytically direct the formatio…
The synthesis of a new family of phosphorus dendrimers built from an octasubstituted metal-free phthalocyanine core is described up to generation 5. This core is used as a sensor and a probe for analyzing the properties of the internal structure and the influence of each structural part (core, branches, surface) upon…
A new family of poly(phenylene-pyridyl) dendrimers (up to the fourth generation) with different periphery was synthesized via a divergent route by using a cascade of Diels−Alder cycloadditions. Tetra(4-ethynylphen-1-yl)methane served as a core. A new A 2 B cyclopentadienone building block, namely, pyridine-containing…
The acidity properties of niobic acid (Nb 2 O 5 ·nH 2 O) and niobium phosphate (NbOPO 4 ) surfaces have been studied by different methods and under various conditions in order to obtain comprehensive information about the number, strength, and strength distribution of their acid sites. Four base probe molecules of dif…
We report the density-functional calculations of NO2 adsorption on single-walled carbon nanotube walls. A single molecular adsorption was endothermic with an activation barrier, but a collective adsorption with several molecules became exothermic without an activation barrier. We find that NO2 adsorption is strongly e…
Photothermal heterodyne detection is used to record the first room-temperature absorption spectra of single CdSe/ZnS semiconductor nanocrystals. These spectra are recorded in the high cw excitation regime, and the observed bands are assigned to transitions involving biexciton and trion states. Comparison with the sing…
Abstract The ionic liquid 1‐dodecyl‐3‐methylimidazole chloride ([C 12 ‐mim]Cl) is doped with 1 mol‐% of the lanthanide ternary complexes [Ln(tta) 3 (phen)] (tta = thenoyltrifluoroacetonate, phen = 1,10‐phenanthroline, Ln = Nd, Eu, Er, Yb), resulting in luminescent mesogenic phases at room temperature. According to DSC…