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。
Zirconium-doped indium oxide (ZIO) thin films (∼2000 Å thick) have been deposited by pulsed-laser deposition on glass substrates without a postdeposition anneal. The structural, electrical and optical properties of these films have been investigated as a function of substrate temperature and oxygen partial pressure du…
We dispersed electrochemical etched Si into a colloid of ultrabright blue luminescent nanoparticles (1 nm in diameter) and reconstituted it into films or microcrystallites. When the film is excited by a near-infrared two-photon process at 780 nm, the emission exhibits a sharp threshold near 106 W/cm2, rising by many o…
Highly ordered TiO2 nanowire (TN) arrays were prepared in anodic alumina membranes (AAMs) by a sol-gel method. The TNs are single crystalline anatase phase with uniform diameters around 60 nm. At room temperature, photoluminescence (PL) measurements of the TN arrays show a visible broadband with three peaks, which are…
Polymeric fibers with diameters in the range from 50 nm to 5 μm are produced by accelerating a fluid jet in an electric field, in a process known as “electrospinning.” Here we show that an essential element of the process is a fluid instability, the rapidly whipping jet. The phenomena responsible for the onset of whip…
The structure and bonding of a series of gold clusters and gold nanomaterials stabilized by ligands or confined within nanoporous alumina have been investigated using EXAFS, XANES, and WAXS. Two gold clusters stabilized by two different ligands, Au 55 (PPh 3 ) 12 Cl 6 and Au 55 (T 8 - OSS−SH) 12 Cl 6, were confirmed t…
The basal (0001) surface plane of α-Al 2 O 3 has been extensively studied both by experimental techniques and applications of theory. Although this surface is not easily created upon cleavage, it grows in during aluminum oxidation and has been shown to be one of the lowest energy surfaces of alumina. Upon heating unde…
Low-field dc magnetization measurements have been performed on powder samples of the weak ferromagnet Mn[N(CN) 2 ] 2 . In small dc fields, H (0.01 ≤ H ≤ 100 Oe), the zero-field and field-cooled magnetizations display the onset of a spontaneous moment below T c = 15.85(3) K, giving small magnetization values which sugg…
2,4-dichlorophenoxyacetic acid (2,4-D) undergoes efficient degradation when an O 2 - or Ar-saturated aqueous solution is subjected to high-frequency (640 kHz) sonolysis. 2,4-dichlorophenol, hydroquinone, and catechol are major reaction intermediates common to various experimental conditions. The similarities between t…
The complexes [Fe[HC(3,5-Me2pz)3]2](BF4)2 (1), [Fe[HC(pz)3]2](BF4)2 (2), and [Fe[PhC(pz)2(py)]2](BF4)2 (3) (pz = 1-pyrazolyl ring, py = pyridyl ring) have been synthesized by the reaction of the appropriate ligand with Fe(BF4)2.6H2O. Complex 1 is high-spin in the solid state and in solution at 298 K. In the solid phas…
Poly(3-octylfuran) has been synthesized with three regioregularities: P3OF-95, P3OF-75, and P3OF-50, where the number signifies the percentage HT content. The 95% HT material is highly crystalline with a structure similar to that of HT-poly(3-octylthiophene), P3OT. The lamellar spacing is 22.1 A and the pi-stacking di…
Sterilized biofilms based on soy protein isolate (SPI, S system) and a 1:1 mixture of SPI and whey protein isolate (WPI, SW system) were achieved through the formation of cross-links by means of gamma-irradiation combined with thermal treatments. The effect of the incorporation of carboxymethylcellulose (CMC) and poly…
A new lanthanum calcium borate with the composition La 2 CaB 10 O 19 has been synthesized. Single crystals have been grown from a melt close to the stoichiometric composition. The compound crystallizes in the monoclinic system, space group C 2, with a = 11.043(3) Å, b = 6.563(2) Å, c = 9.129(2) Å, α = γ = 90°, β = 91.…
The results of realistic computer simulations of dense polymer melts filled with solid nanoparticles are compared with results obtained for similar systems near planar solid surfaces and with those of Monte Carlo calculations performed for single chains in the presence of spherical solid obstacles. The polymer units a…
In a recent letter (Phys. Rev. Lett. 84, 4629 (2000)), Lacks presents evidence of a first order amorphous-amorphous transition in silica at T=0. He calculates the free energy along a path of compression and successive decompression of a sample of 108 SiO2 units. The free energy of the two branches cross each other, an…
High-refractive-index trialkoxysilane-capped PMMA−titania hybrid optical thin films were prepared by an in situ sol−gel process, followed by spin-coating and multistep baking. The acrylic monomers used were methyl methacrylate (MMA) and 3-(trimethoxysilyl)propyl methacrylate (MSMA). Titanium(IV) n -butoxide was used f…
Complex structures based on “host−guest” systems make possible the development of new materials with promising technological applications. In this work, we synthesized a V 2 O 5 · n H 2 O/surfactant ( N -cetyl- N, N, N,-trimethylammonium bromide) composite that presented an improved charge capacity and stability on el…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(dimethylsilylenemethylene-co- dimethylsiloxane): A Regularly Alternating Copolymer of Poly(dimethylsiloxane) and Poly(dimethylsilylenemethylene)Leonard V. Interrante, Qionghua Shen, and Jun LiView Author Information Department…
The structural characterization of melt-crystallized samples and oriented fibers of syndiotactic copolymers between propene and 1-butene is reported. Melt-crystallized samples of copolymers are crystallized in the form I of syndiotactic polypropylene (s-PP) up to a content of 1-butene of 60−70 mol %, although disorder…
NiO in Verbindung mit Aluminiumoxid wurde durch Temperatur-programmierte Reduktion als die aktive Spezies in Ni-Al-Hydrotalcit-Katalysatoren bestimmt. Diese Katalysatoren können α-Ketole sowie benzylische und allylische Alkohole zu den entsprechenden Carbonylkomponenten quantitativ und unter milden Reaktionsbedingunge…
Adsorption and electrosorption behavior of ethyl xanthate (EtX - ) and thiocyanate (SCN - ) anions, individually and when they are together in a solution, were studied at high-area C-cloth electrodes by in situ UV spectroscopy in relation to development of methodologies for purification of industrial wastewaters. The…