Materials Literature
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New types of monodisperse, micrometer-sized, hollow particles (see Figure) are obtained by encapsulation of emulsion droplets in solid shells and dissolution of the cores. A facile fabrication method is used in which, by simply tuning the thickness of the shells, different types of particles with tunable properties ar…
Mechanical strain gradient generated electric polarization or flexoelectric effect was investigated in unpoled lead zirconate titanate (PZT) ceramics in the ferroelectric state by using a cantilevered beam based approach. Flexoelectric coefficient μ12 at room temperature was measured to be 1.4μC∕m in the PZT ceramic a…
The formation of MgAl layered double hydroxide (LDH) from physically mixed MgO and Al 2 O 3 oxides upon hydrothermal treatment has been extensively investigated, and a formation mechanism has been proposed. We observed that the formation of LDH from the oxide mixture occurs upon heating at 110 °C. In general, LDH is t…
The cyano-bridged trinuclear compound, (NEt(4))[Mn(2)(salmen)(2)(MeOH)(2)Fe(CN)(6)] (1) (salmen(2)(-) = rac-N,N'-(1-methylethylene)bis(salicylideneiminate)), reported previously by Miyasaka et al. (ref 19d) has been reinvestigated using combined ac and dc susceptibility measurements. The strong frequency dependence of…
We report an accurate determination of the hydrodynamic boundary condition of simple liquids flowing on smooth hydrophobic surfaces using a dynamic surface force apparatus equipped with two independent subnanometer resolution sensors. The boundary slip observed is well defined and does not depend on the scale of inves…
Copolyamides, based on 1,12-dodecanedicarboxylic acid and different ratios of 1,2-ethylenediamine and piperazine, i.e., PA-(2.14- co -pip.14), as well as the corresponding homopolymers PA-2.14 and PA-pip.14, were studied by SAXS and WAXS. Up to a pip mole ratio of 0.62, the 2.14 and pip.14 units cocrystallize in a com…
Synthesis of copper and zinc phthalocyanines (Pcs) bearing phenoxy-substituents is described. Precursors required for the preparation of Pcs 9-16 are prepared by a nucleophilic aromatic substitution reaction between a sterically hindered phenol derivative and 4-nitrophthalonitrile (1) or 3-nitrophthalonitrile (2). Cyc…
We report the direct supramolecular assembly of organofunctional compositions of the type (SiO2)1-x-(LSiO1.5)x (L = mercaptopropyl) with a mesocellular foam structure (x = 0.20), along with a new hybrid structure in which the windows of a foam structure are filled with a wormhole framework (x = 0.30−0.50).
The synthesis of core−shell nanoparticles consisting of a shape-persistent polyphenylene dendrimer ( TdG 2 ) as the core and of different polymers (poly(ethylene oxide), polystyrene and polyisoprene) as mono- or double -shells is presented. Mono-shell systems are obtained either by a “ grafting-onto” (arm first) proce…
Abstract Platinum and gold microelectrode arrays (MEAs), fabricated on silicon substrates with different geometric characteristics, were surface‐modified by the potentiostatic electropolymerization of the pyrrole‐ferrocene derivative Py(CH 2 ) 3 NHCOFc, in the case of the platinum MEAs, and chemisorption of the th…
The phase behavior of the newly found miscible polymer blends poly(4-trimethylsilylstyrene) and polyisoprene was investigated with optical microscopy (OM) and also with differential scanning calorimetry (DSC), while the degree of polymer−polymer interaction was evaluated with small-angle neutron scattering (SANS). The…
Modern materials science requires efficient processing and characterization techniques for low dimensional systems. Raman and photoluminescence spectroscopy are important nondestructive tools which provide much information about such systems. Commercial Raman spectrometers are expensive. We discuss a less expensive ap…
Select ferrous spin-transition complexes with the pentadentate ligand 2,6-bis(bis(2-pyridyl)methoxymethane)pyridine (PY5) were examined using variable-temperature solution solid-state magnetic susceptibility, crystallography, X-ray absorption spectroscopy (XAS), and UV/vis absorption spectroscopy. Altering the single…
A fully plasma-based technique of generating ultrafine (sub-10-nm) nanocrystalline silver particulates on wide band gap and chemically inert hexagonal aluminum nitride nanorod templates has been demonstrated. These specially prepared substrates are ready to use for molecular sensing by room-temperature surface-enhance…
In a certain parameter region, a single sonoluminescencing bubble is unstable against diffusion of gases and their chemical dissociation. Experiments show that a surface unstable bubble emits a microbubble and recoils. After this it exhibits specific dynamical features whereby the ambient radius changes in a nonmonoto…
Purpose This paper aims at developing a computational technique to take account of the laminated nature of iron cores when computing their eddy current losses. Design/methodology/approach A method is presented to compute three-dimensional eddy current distributions in laminated media by means of the finite element met…
The polymerization of divinyl adipate (DVA) as an effective cross-linker with dimethyl 2,2‘-azobis(iosbutyrate) (MAIB) was performed at 70 and 80 °C in benzene. When the MAIB concentrations as high as 0.05−0.50 mol/L were used, the polymerization of DVA (0.30 mol/L) proceeded homogeneously at 80 °C without any gelatio…
Poly[(2-methoxy-5-propyloxysulfonate)phenylene vinylene] (MPS-PPV) was synthesized directly from its bischloromethylated monomer, considerably reducing the total number of steps involved in the polymer preparation. For the first time, a simple technique of ultracentrifugation was employed for final purification of the…
Two spin-crossover (SCO) complexes [Fe(II)(3-MeO,5-NO2-sal-N(1,4,7,10)] (1) and [Fe(II)(3-EtO,5-NO2-sal-N(1,4,7,10)] (2) have been prepared and studied (3-MeO,5-NO2-sal-N(1,4,7,10) and 3-EtO,5-NO2-sal-N(1,4,7,10) are deprotonated 2-[12-(hydroxy-3-methoxy-5-nitrophenyl)-2,5,8,11-tetraazadodeca-1,11-dien-1-yl]-2-methoxy…
Abstract Many polymer films are produced by extruding the polymer in a cast‐ or blown‐film process. Often an additive is preblended into the polymer and, once the film is formed, the additive migrates to the film surface(s). Erucamide is a migratory additive that is commonly placed in polyolefin films to reduce their…