Studies on Polyhalides. Part 42. The Pentaiodide‐Ion I5‐; an Overview: Preparation and Crystal Structure of [Rb(C16H24O6)] (I5)×H2O.
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Temperature-induced surface transition in nematic liquid crystals oriented by evaporatedSiOx
Temperature induced surface transitions observed in nematic liquid crystals oriented by obliquely evaporated SiOx are analyzed. It is shown that the experimental data can be interpreted with a theory for the thermal renormalization of the anisotropic part of the surface energy based on the mean field approximation. By…
Implementation of surface tension with wall adhesion effects in a three‐dimensional finite element model for fluid flow
Abstract This paper addresses the finite element modelling of surface tension. The external stress vectors associated with surface tension are assumed proportional to the average curvature and oriented along the normal vector to the fluid surface. The issue of estimating the average curvature of a discretized surface…
Synthesis, Structure, and Properties of Core-Terminated Hyperbranched Polyesters Based on Dimethyl 5-(2-Hydroxyethoxy)isophthalate
The molecular weight of hyperbranched polyesters, prepared by condensation polymerization of the AB 2 monomer dimethyl 5-(2-hydroxyethoxy)isophthalate in the presence of either a B 3 core (trimethyl 1,3,5-benzenetricarboxylate) or a B 2 core (dimethyl isophthalate), was controlled by varying the core-to-monomer ratio.…
Thermal and infrared spectroscopic studies on hydrogen‐bonding interactions between poly‐(ε‐caprolactone) and some dihydric phenols
Abstract The effects of three dihydric phenols on the thermal properties of poly‐(ε‐caprolactone) (PCL) were investigated by DSC. The thermal properties of PCL were found to be greatly modified by the addition of 4,4′‐dihydroxydiphenyl ether (DHDPE). When the content of DHDPE reached 40%, PCL that was a semicrystallin…
Rapid Synthesis of Al-Containing Mesoporous Silica Hard Spheres of 30−50 μm Diameter
Al-containing mesoporous silica hard spheres of 30−50 μm mean diameter have first been synthesized at room temperature in 80 min using 1-alkylamine as a structure-directing agent. The formation of the spheres occurs only within a definite range of molar synthesis compositions of Si, Al, HCl, H 2 O, and 1-alkylamine, e…
Differential scanning calorimetry analysis of silicon‐containing and phosphorus‐containing segmented polyurethane. I—Thermal behaviors and morphology
Abstract This article investigated thermal transition and morphology utilizing differential scanning calorimetry (DSC), which was performed on silicon‐containing and phosphorus‐containing segmented polyurethane (Si‐PU and P‐PU). The hard segments of those Si‐PU and P‐PU polymers investigated consisted of 4,4′‐diphenyl…
The stability of self-organized 1-nonanethiol-capped gold nanoparticle monolayer
1-Nonanethiol-protected gold nanoparticles with the size of about 2 nm have been prepared by a wet chemical method through choosing a suitable ratio of Au:S (2.5:1). Size selective precipitation of nanoparticles has been used to narrow their size distribution, which facilitates the formation of an ordered nanoparticle…
Time evolution of tetragonal-orthorhombic ferroelastics
We study numerically the time evolution of two-dimensional (2D) domain patterns in proper tetragonal-orthorhombic (T-O) ferroelastics. Our equations of motion are derived from classical elasticity theory, augmented by nonlinear and strain-gradient terms. Our results differ from those found by other dynamical methods.…
Reaction of Hydrogrossular with Hydrogen Chloride Gas at High Temperature
The reaction between hydrogrossular and hydrogen chloride (HCl) gas was performed in a fixed bed reactor above 400 °C. The hydrogrossular was efficiently reacted with HCl gas in the temperature range of 400 to 950 °C and transformed into Ca 12 Al 9.9 Si 4.05 O 32 Cl 5.9 (calcium aluminum chlorosilicate). The crystal s…
Crystallization kinetics and crystallization behavior of syndiotactic polystyrene/clay nanocomposites
Abstract We investigated the effects of montmorillonite (clay) on the crystallization kinetics of syndiotactic polystyrene (sPS) with isothermal differential scanning calorimetry analyses. The clay was dispersed into the sPS matrix via melt blending on a scale of 1–2 nm or up to about 100 nm, depending on the surfacta…
A study of the reaction characteristics and mechanism of Kapton in a plasma-type ground-based atomic oxygen effects simulation facility
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…
Synthesis and Characterization of an Al693- Cluster with 51 Naked Al Atoms: Analogies and Differences to the Previously Characterized Al772- Cluster
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…
Fabrication and characterization of electrochromic nanocrystalline WO3/Si (111) thin films for infrared emittance modulation applications
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)…
The First Structurally Characterized Hypervalent Silicon Hydride: Unexpected Molecular Geometry and Si−H···K Interactions
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…
Argentophilicity and Solvent-Induced Structural Diversity in Double Salts of Silver Acetylide with Silver Perfluoroalkyl Carboxylates
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…
Sol-gel PZT and Mn-doped PZT thin films for pyroelectric applications
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…
Nuclear Spin Driven Quantum Relaxation inLiY0.998Ho0.002F4
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…
Nanorainbows: Graded Semiconductor Films from Quantum Dots
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,…
Exohydrogenated single-wall carbon nanotubes
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…