Materials Literature
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Kapton, a commonly used spacecraft material, is studied to investigate the atomic oxygen (AO) erosion effects in a plasma-type ground-based AO effects simulation facility. The samples before and after the experiments are compared in aspect, mass and surface morphology. The reaction characteristics of the material in t…
A disproportionation process of a metastable AlCl solution with a simultaneous ligand exchange-Cl is substituted by N(SiMe(3))(2)-leads to a [Al(69)[N(SiMe(3))(2)](18)](3-) cluster compound that can be regarded as an intermediate on the way to bulk metal formation. The cluster was characterized by an X-ray crystal str…
Tungsten oxide thin films with different stoichiometry have been deposited on Si (111) wafers by pulsed laser deposition (PLD) technique under different conditions. The structural properties and infrared emissivity of WO 3 thin films were analysed using a scanning accessory of a transmission electron microscope (STEM)…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe First Structurally Characterized Hypervalent Silicon Hydride: Unexpected Molecular Geometry and Si−H···K InteractionsMichael J. Bearpark, G. Sean McGrady, Paul D. Prince, and Jonathan W. SteedView Author Information Department of Chemistry, King's College London St…
A series of novel double salts of silver(I) were isolated by dissolving Ag(2)C(2) in a concentrated aqueous solution of R(F)CO(2)Ag (R(F) = CF(3), C(2)F(5)) and AgBF(4). Different ancillary solvento ligands such as H(2)O, CH(3)CN, and C(2)H(5)CN were found to affect the crystallization process that led to the assembly…
Thin films of ferroelectric lead zirconate titanate (PbZr 0.3 Ti 0.7 O 3 PZT30/70) and manganese-doped lead zirconate titanate ((Pb(Zr 0.3 Ti 0.7 ) 1- x Mn x )O 3 , where x = 0.01, PM01ZT30/70; and x = 0.03, PM03ZT30/70) have been prepared using sol-gel processing techniques. These materials can be used as the pyroele…
Staircaselike hysteresis loops of the magnetization of a LiY0.998Ho0.002F4 single crystal are observed at subkelvin temperatures and low field sweep rates. This behavior results from quantum dynamics at avoided level crossings of the energy spectrum of single Ho3+ ions in the presence of hyperfine interactions. Enhanc…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanorainbows: Graded Semiconductor Films from Quantum DotsArif A. Mamedov, Artem Belov, Michael Giersig, Nataliya N. Mamedova, and Nicholas A. KotovView Author Information ChemistryDepartment, Oklahoma State University Stillwater, Oklahoma, 74078 Hahn-Meitner-Institut,…
An extensive first-principles study of fully exohydrogenated zigzag $(n,0)$ and armchair $(n,n)$ single-wall carbon nanotubes $({\mathrm{C}}_{n}{\mathrm{H}}_{n}),$ polyhedral molecules including cubane, dodecahedrane, and ${\mathrm{C}}_{60}{\mathrm{H}}_{60}$ points to crucial differences in the electronic and atomic s…
We investigate the order - disorder transition line from a Bragg glass to an amorphous vortex glass in the H-T phase diagram of three-dimensional type-II superconductors with account of both pinning-caused and thermal fluctuations of the vortex lattice. Our approach is based on the Lindemann criterion and on results o…
Soluble samples of single-wall and multiple-wall carbon nanotubes that are functionalized by lipophilic and hydrophilic dendra can be defunctionalized in homogeneous solutions under base- and acid-catalyzed hydrolysis reaction conditions. The results provide strong evidence for the ester linkages in the functionalizat…
The atomic structure of amorphous materials is believed to be well described by the continuous random network model. We present an algorithm for the generation of large, high-quality continuous random networks. The algorithm is a variation of the "sillium" approach introduced by Wooten, Winer, and Weaire. By employing…
A series of macrocyclic Eu, Gd, and Tb complexes has been prepared in which the intramolecular ligation of a beta-arylsulfonamide nitrogen is rendered pH-dependent, giving rise to changes in the hydration state, q, at the lanthanide center. In complexes based on DO3A, variation of the p-substituent in the arylsulfonam…
A diverse array of semiconductor-based composite materials have been prepared, characterized, and utilized in many applications ranging from photocatalysis, photovoltaic cells, photoelectrochromic displays, and light-emitting devices to sensors. The composite architectures (nanoarchitectures in many cases) are equally…
The electrochemically stimulated conformational relaxation model (ESCR) allows a good description of the chronoamperometric responses of polyaniline in acetonitrile solutions under relaxation control. Compaction, relaxation and diffusion controlled oxidation with penetration of counterions and increase of volume can b…
Kein Tempolimit: PAMAM-Dendrimere der sechsten Generation wurden mit bis zu 198 TEMPO-Gruppen (TEMPO=2,2,6,6-Tetramethylpiperidin-1-oxyl) funktionalisiert (siehe Bild); sie können EPR-inaktive Hydroxylamine zu EPR-aktiven Nitroxiden reoxidieren, was sie interessant für Anwendungen in der EPR-Bildgebung macht.
Polyaniline, (PANI) in the form of emeraldine base, was synthesized by polymerizing aniline in acid solutions at different sub-zero temperatures to give a range of molecular weights between 100,000 and 300,000 gmol<SUP>-1</SUP>. Molecular weights were measured using gel permeation chromatography (GPC). The polymers we…
The mesoscopic morphology of wet-spun polyaniline fibers determines their mechanical strength. Macrovoid formation in the coagulation bath is responsible for poor mechanical properties of these fibers. The effects of polymer concentration, coagulation bath temperature, polymer molecular weight and coagulant on the mor…
The electromechanical actuation performance of carbon nanotube mats, polypyrrole films and hybrid nanotube-polypryrrole materials has been compared. The hybrid materials were formed by coating nanotube mats with polypyrrole using vapour deposition and electropolymerisation techniques. When the coating time was short,…
Hyperbolic Periodic Nodal Surfaces (PNSs) have been investigated with respect to surface modulations. The resulting patterns and tilings are beautiful examples of texture information on hyperbolic objects. The construction principle, based on short Fourier series, allows for a strict symmetry control of the generated…