Materials Literature
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The electrical transport properties of epitaxial ZnO films grown on different orientations of sapphire substrates have been measured as a function of partial pressure of oxygen. After equilibration, the carrier concentration is found to change from a p ‐1/4 O2 to a p ‐3/8 O2 dependence with increasing oxygen partial p…
Abstract The design, synthesis, and properties of supermolecules consisting of well defined assemblies of linear and globular macromolecules is studied. Therefore, several families of hybrid block polymers based on polyether dendrimers linked to well‐defined blocks of polyethylene oxide, polyethylene glycol, polyester…
In the framework of microscopic theory of structural phase transitions on the basis of the cooperative Jahn-Teller effect, the phase diagrams of the ${\mathrm{Tm}}_{\mathit{x}}$${\mathrm{Lu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{PO}}_{4}$ and ${\mathrm{Tb}}_{\mathit{x}}$${\mathrm{Y}}_{1\mathrm{\ensuremath{-}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRemote Hydrogen Plasma Chemical Vapor Deposition of Amorphous Hydrogenated Silicon-Carbon Films from an Organosilane Molecular Cluster as a Novel Single-Source Precursor: Structure, Growth Mechanism, and Properties of the DepositA. M. Wrobel, S. Wickramanayaka, Y. Nakanishi,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic-Inorganic Polymeric Hybrids Involving Novel Poly(hydroxymethylsiloxane)Shaoxiang Lu, Miryam M. Melo, Jianqun Zhao, Eli M. Pearce, and T. K. KweiCite this: Macromolecules 1995, 28, 14, 4908–4913Publication Date (Print):July 1, 1995Publication History Published online1…
We have studied the mesophase behaviour and structure of certain dimeric compounds, the α,ω-bis(4-n-alkoxyazobenzene-4′-carbonyloxy)alkanes, in which two azobenzene moieties with alkoxy tails are linked by a polymethylene spacer. The effect of the length of the (CH2)n spacer was examined by preparing four series of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreactive Supramolecular Assemblies: Aggregation and Photoisomerization of Azobenzene Phospholipids in Aqueous BilayersXuedong Song, Jerry Perlstein, and David G. WhittenCite this: J. Am. Chem. Soc. 1995, 117, 29, 7816–7817Publication Date (Print):July 1, 1995Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, Thermochemistry, and Magnetic Properties of Binary Copper Carbonyls by a Density-Functional ApproachVincenzo BaroneCite this: J. Phys. Chem. 1995, 99, 30, 11659–11666Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published iniss…
The effect of ascending additions of fine TiO2 powder on the porosity of a hand mixed polyurethane foam system was studied. Voidage was sustained in the 95% region up to 20 vol% powder addition based on the polymer. Loss of powder from the windows occurred below this level and a reticulate structure was obtained on si…
Genuine incommensurate smectic A phases were recently discovered, among the rich polymorphism of a new dimesogenic liquid crystal compound (KI5). In the present paper, we examine the role played by molecular parameters in the existence of such incommensurate state. In a series of several homologues of KI5, we find tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Thermal Properties of New Comblike Polyamides: Helical Poly(.beta.-L-aspartate)s Containing Linear Alkyl Side ChainsF. Lopez-Carrasquero, S. Montserrat, A. Martinez de Ilarduya, and S. Munoz-GuerraCite this: Macromolecules 1995, 28, 16, 5535–5546Publication Dat…
We describe an experimental technique that allows for the direct determination of the motion (i.e., the momentum) of electrons in atoms, molecules, and solids. This ($e$, $2e$) technique centers on a fast electron's ejecting a second electron from a target. Precise spectroscopy of both electrons' final energies and mo…
Remote argon plasma (RP) and ozone in the presence of ultraviolet light (UV–O3) were used to render polystyrene (PS) surfaces hydrophilic in a controlled manner for eventual application in cell-surface interaction studies. X-ray photoelectron spectroscopy (XPS) was used to characterize both methods of modification. Th…
Liquid crystal (LC) mixtures of a reactive diacrylate and a commercial ferroelectric liquid crystal (FLC) mixture were produced. The mixtures were brought into cells provided with orientation layers in which various orientations such as uniaxial and twisted orientations, could be induced. When the desired orientation…
info:eu-repo/semantics/published
Unlike Pb(Mg 1/3 Nb 2/3 )O 3 and similar ferroelectric relaxors which never truly become ferroelectric at zero‐field, disordered Pb(Sc 1/2 Ta 1/2 )O 3 (PST) is a relaxor that spontaneously transforms into a ferroelectric phase. The control of the degree of order of the B‐site cations in PST by appropriate heat treatme…
On the basis of a generalization of the Rapini-Papoular expression [J. Phys. (Paris) Colloq. 30, C4-54 (1969)] for the anchoring energy, the rigorous expressions for the threshold and saturation fields are derived analytically, in detail, for a field-controlled twisted chiral nematic slab with weak boundary coupling.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrafast Photoinduced Electron Transfer in Rigid Porphyrin-Quinone DyadsAlisdair N. Macpherson, Paul A. Liddell, Su Lin, Lori Noss, Gilbert R. Seely, Janice M. DeGraziano, Ana L. Moore, Thomas A. Moore, and Devens GustCite this: J. Am. Chem. Soc. 1995, 117, 27, 7202–7212Pub…
Analytic expressions for a multiple-cascade model were derived to study the filling of L and K vacancies of hollow Ne atoms moving in shallow layers of an Al surface. The model requires cross sections for charge transfer into the L shell of the projectile that were determined from molecular-orbital calculations includ…
Nanoscale tubular biomaterials (e.g. see Fig.) produced by the self‐assembly of peptide nanotube structures have a potentially wide range of applications in chemistry, biology, and materials science. The methods of producing such structures are reviewed and a number of potential applications discussed magnified image .