Materials Literature
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Organized ceramic/polymer nanocomposites were designed from montmorillonite clay (Mont), cationic poly(ethylenimine) (PEI) or poly(dimethyldiallylammonium chloride) (PDDA) and proteins. Ordered multilayers with a controllable number of layers were prepared by alternate adsorption of delaminated montmorillonite (0.03 w…
The synthesis and characterization of Ta-TMS1, a new member of a growing family of hexagonally packed transition-metal oxide mesoporous molecular sieves (termed TMS1) is described. Ta-TMS1 exhibits a hexagonal array of pores which can be varied in size from 20 to 40 Å and surface areas of over 500 m 2 /g. The thermal…
A systematic study of the factors governing the formation of Nb-TMS1, a niobium-based mesoporous hexagonally-packed transition metal oxide molecular sieve, is reported. The synthesis of this material was achieved through a novel ligand-assisted liquid crystal templating mechanism in which a discrete covalent bond is u…
Dendritic aliphatic polyesters of one, two, three, and four generations ( M w: 906, 1856, 3754, and 7549 g/mol) were synthesized in the convergent fashion, using 2,2-bis(hydroxymethyl)propionic acid as building block and 1,1,1-tris(hydroxyphenyl)ethane as core molecule. Dendrons of one to four generations were synthes…
The development of the dynamic glass transition in poly( n -alkyl methacrylate)s is investigated with broad-band dielectric spectroscopy in the frequency range from 10 -4 to 10 9 Hz. The experimental data were analyzed by adjustment with one or a sum of two Havriliak Negami functions. Upon decreasing the temperature,…
The structure and dynamical behavior of short and long chain alkanethiols, CH 3 (CH 2 ) 7 SH and CH 3 (CH) 17 SH, and of a hydroxyalkanethiol, HO(CH 2 ) 16 SH, adsorbed onto gold nanoparticles were studied by variable temperature solid-state 13 C NMR spectroscopy. In both the solution and solid state, the resonances o…
A. Harriman and J. Sauvage, Chem. Soc. Rev., 1996, 25, 41 DOI: 10.1039/CS9962500041
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssemblage and Alignment of the Spins of the Organic Trinitroxide Radical with a Quartet Ground State by Means of Complexation with Magnetic Metal Ions. A Molecule-Based Magnet with Three-Dimensional Structure and High TC of 46 KKatsuya Inoue, Takashi Hayamizu, Hiizu I…
Masses, Sizes, and Shapes of Macromolecules from Multifunctional Monomers From Theory to Practice: Historical Perspectives Nomenclature Synthetic Methodologies: Divergent Procedures Synthetic Methodologies: Convergent Procedures Synthetic Methodologies: One-step (Hyperbranched) Procedures Chiral Dendritic Macromolecul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMimicking Aspects of Heterogeneous Catalysis: Generating, Isolating, and Reacting Proposed Surface Intermediates on Single Crystals in VacuumBrian E. BentView Author Information Department of Chemistry and Columbia Radiation Laboratory, Columbia University, New York, New Yor…
Giant magnetoresistance (GMR), which was until recently confined to magnetic layered and granular materials, as well as doped magnetic semiconductors, occurs in manganate perovskites of the general formula Ln 1- x A x MnO 3 (Ln = rare earth; A = divalent ion). These manganates are ferromagnetic at or above a certain v…
Lanthanide complexation chemistry in solution is an active research theme because of the importance of gadolinium complexes as contrast agents in magnetic resonance imaging, and of luminescent europium and terbium complexes as probes in biochemistry. The physicochemical principles and theory underpinning this work are…
A new class of sterically hindered dendrimer-metalloporphyrins was synthesized for use as shape-selective oxidation catalysts. A series of oxidatively robust poly(phenylesters) dendrimers were prepared through a convergent synthesis. Monodendrons were appended to the meta -positions of the 5,10,15,20-tetrakis(3‘,5‘-hy…
Hexagonal mesoporous titanosilicates with distinguishable framework charges and textural mesoporosity, namely, Ti-MCM-41 and Ti-HMS, were prepared at ambient temperature by electrostatic and neutral assembly processes, respectively. Titanium incorporation at the 2 mol % level for both materials was accompanied by incr…
Fatigue damage accumulation and failure modes of several unidirectional and angle-ply SCS-6 fiber-reinforced titanium matrix composites are reviewed. The fatigue damage characteristics of the notched and unnotched composites were classified using several schematic diagrams based upon the constituent's properties and l…
Gallium oxide thin films have been deposited by atomic layer epitaxy (ALE) using Ga(acac)3(acac = pentane-2,4-dionate) and either water or ozone as precursors. Films were grown on silicon (100), soda lime and Corning glass substrates. The influence of the deposition parameters (e.g. pulse duration, growth and source t…
The Application of Computational Chemistry to the Study of Molecular Materials On the Crystallographic and Statistical Mechanical Foundations of the Hartman-Perdok Theory An Ab Initio Approach to Crystal Structure Determination Using High Resolution Powder Diffraction and Computational Chemistry Techniques An Automate…
In Team Toyota Besser presents the results of an in-depth study of Toyota's assembly plant in Georgetown, Kentucky. Based on employee interviews, analyses of company publications, newspaper accounts, interaction with company employees and attendance at company events over a five-year period, this book documents how To…
The platinum tip of a scanning tunneling microscope is employed to direct the electropolymerization of aniline on nanometer-scale regions of a graphite surface which is immersed in an aqueous, aniline-containing electrolyte. The electropolymerization of aniline is initiated by two bias voltage pulses which are applied…
A new type of ring-opening monomer has been investigated and found to undergo facile and efficient free-radical polymerization. The monomers are cyclic allylic sulfides with 6-methylene-1,4-dithiepane ( 3 ) and 3-methylene-1,5-dithiacyclooctane ( 4 ) synthesized and investigated as two examples. 6-Methylene-1,4-dithie…