Materials Literature
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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…
The origin of enantioselectivity in the Jacobsen-Katsuki reaction has been investigated by applying density functional calculations in combination with molecular mechanics methodologies. The calculations suggest that a high enantiomeric excess is connected to three specific features: 1) a chiral diimine bridge, which…
The preparation and structural characterization of scandium and f-element complexes derived from the disiloxanediolate dianion, [(Ph2SiO)2O]2-, are reported. Reactions of in situ prepared Ln[N(SiMe3)2]3 (Ln = Eu, Sm, Gd) with (Ph2SiOH)2O in different stoichiometries afforded the lanthanide disiloxanediolates [Eu[[(Ph2…
The theoretical analysis on the zero point of charge (ZPC) and charge density of colloidal particles possessing permanent charges indicates that ZPC determined directly by means of potentiometric titration (PT) should be zero point of net charge (ZPNC) and the permanent charge density (σ P ) can be obtained from the a…
Ein organisch-anorganisches Hybrid: In Gegenwart von kationischen Nitronylnitroxid-Radikalen kann sich ein neuer Typ von Mischmetalloxalaten [MnII(H2O)CrIII(ox)3]− bilden. Die stabilen freien Radikale befinden sich in dem dreidimensionalen anorganischen Netzwerk, das hier stilisiert dargestellt ist (○ = Mn, • = Cr); d…
Der Bedarf der pharmazeutischen und agrochemischen Forschung an Substanzbibliotheken hat eine verstärkte Suche der Industrie nach neuen Technologien, die die Automatisierung von Syntheseprozessen erlauben, zur Folge. Seit den Pionierarbeiten von Merrifield spielen polymere Trägermaterialien eine Schlüsselrolle in dies…
The novel macromolecule, poly(benzo[ c ]thiophene -N -2-ethylhexy-4,5-dicarboxylic imide) (EHI−PITN), has been designed and synthesized. The polymer has a well-defined structure which was characterized by FTIR, 1 H NMR and 13 C NMR spectroscopies, and elemental analysis. TGA analysis indicates that the polymer has goo…
Megavolt-per-second cyclic voltammetry is used to control the expansion with time of a diffusion layer created within the redox outer shell of a fourth generation dendrimer molecule adsorbed onto an electrode; one quarter of the dendrimer is shown in the picture. This allows the measurement of the degree of communicat…