Materials Literature
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A new family of materials based on layered transition metal dichalcogenides of the type [M‘xQyLz]n[MoS2] (Q = S, Se, Te) was prepared as a first step toward pillared layered sulfides. The new intercalated phases form from the addition of Co6Q8(PR3)6 solutions to exfoliated suspensions MoS2.
Zircaloy-2 and -4, developed mainly in the United States, have been used in Germany for fuel rod claddings and in-core structural components from the beginning of reactor technology. Extensive studies of the material properties of the Zircaloys have been performed in Siemens laboratories since 1957. Irradiation testin…
The main object of an industrial crystallization process is to produce crystals with desired properties such as crystal size distribution (CSD), shape and purity. The CSD is determined by the rates of nucleation, attrition and breakage, agglomeration, and growth. The intention of this paper is to focus on nucleation,…
We describe the formation of a stable triplet-state oligoaniline di(cation radical) via a proton-triggered redox reaction between N,N ‘-bis[4-(phenylamino)phenyl]-1,3-benzenediamine ( 1 ) and N,N ‘-bis[4-(phenylimino)-cyclohexa-2,5-dienylidene]-1,3-benzenediamine ( 2 ). In this reaction 1 is oxidized, while protonated…
New noncentrosymmetric crystals including the 2-amino-5-nitropyridinium and 2-amino-5-nitropyridine chromophores have been designed following a strategy first applied to the 2-amino-5-nitropyridinium dihydrogen phosphate. If a counteranion able to self-aggregate in chains or layers as (H 2 PO 4 - ) n is associated to…
Cyclopalladation of 4′-functionalized 6′-phenyl-2,2′-bipyridine ligands (HLn, n= 1–3) leads to [PdLnCl] species as demonstrated by the crystal structure of [PdL1Cl]; thermotropic nematic mesomorphism is observed for HL3 and [PdL3Cl]; the latter is also photoluminescent at 77 K.
Poly( l -lactide) (PLLA) prepared by ring-opening melt polymerization using tin−octoate as catalyst undergoes a rapid melt degradation. The melt stability of PLLA was evaluated by using a Haake melt rheometer at various temperatures. The degradation rate constants were calculated from the changes in the melt viscosity…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSoluble, Highly Conjugated Polyenes via the Molybdenum-Catalyzed Copolymerization of Acetylene and Diethyl DipropargylmalonateFlorian J. Schattenmann and Richard R. SchrockView Author Information Department of Chemistry, 6-331, Mass…
Recent experimental and theoretical efforts suggest that ordered diblock copolymer blends can be approximated as single-component systems of average composition or molecular weight (or both) if the constituent copolymers are closely matched with respect to composition and molecular weight. In this work, we explore the…
A bioresorbable composite material composed of a high molecular weight poly(DL-lactic acid) and granules of natural coral (40/60 w/w) was made by blending in acetone with further evaporation of the solvent. The blend and the unfilled polymer matrix were compression moulded and machined to yield 12 x 12 mm plates of di…
The adsorption process of the single polymer chain in a polymer brush of varying surface coverages is studied by means of Monte Carlo simulations of the bond-fluctuation lattice model. Only the end monomers can adsorb at the grafting surface, whereas inner monomers interact repulsively with it. The brush builds up a s…
Aggregation of some low-molecular weight compounds in organic liquids is known to result in the formation of rod-shaped colloidal particles. 1 Beyond the overlap concentration of the aggregates, the systems usually exhibit remarkable viscoelastic features which account for their description as gel-like materials. In p…
This study investigates the contributions of surface wetting and pore structure to liquid retention of fibrous materials using regular and microdenier poly(ethylene te rephthalate) (PET) fabrics as the porous media. Varying surface wetting contact angles and pore structures are produced by hydrolysis of these PET fabr…
Large-amplitude oscillatory shear was applied to a poly(styrene- b -ethylenepropylene) diblock copolymer and also to binary blends of this copolymer with homopolystyrene. The shearing was applied at a temperature above the glass transition and well below the microphase separation transition for long times: 12 h, strai…
Previous temperature-programmed desorption (TPD) and molecular beam studies have concluded that formaldehyde desorption is the only significant pathway in methanol oxidation at Cu(110) surfaces. We present here new TPD data for the adsorption of deuterated methanol (CD 3 OH) at a preoxidized Cu(110) surface and show t…
A high-throughput laser Raman spectrometer is used to detect adsorbed ethoxide species during the catalytic oxidation of ethanol over supported molybdenum oxide at atmospheric pressure. Two different species are observed, a true reaction intermediate and a relatively inert spectator on the surface. Steady-state and dy…
The problem of initiating and controlling the regeneration of diesel particulate filters is the major obstacle in the wide application of trap systems in diesel-powered vehicles. The most promising solution approaches to this problem, in terms of minimization of system cost and of additional fuel consumption, are base…
Single crystals of TMA-CuGS-2, [C 4 H 12 N] 6 [(Cu 0.44 Ge 0.56 S 2.23 ) 4 (Ge 4 S 8 ) 3 ], were synthesized hydrothermally, and the structure was determined using data collected from sealed-tube and synchrotron X-ray sources. This compound consists of Ge 4 S 10 4- adamantine clusters, corner-sharing with MS x units (…
We report resonance Raman and photoluminescence data from ultrathin films of CdS grown on Au substrates using electrochemical atomic layer epitaxy (ECALE). Samples ranged in coverage from 25 to 200 monolayers. Quantitative analysis of resonance Raman intensities leads to several important conclusions. First, ECALE doe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreorganization of Ferric Alcaligin, Fe2L3. The First Structure of a Ferric Dihydroxamate SiderophoreZhiguo Hou, Christopher J. Sunderland, Takayuki Nishio, and Kenneth N. RaymondView Author Information Department of Chemistry University of California, Berkeley Berkele…