Materials Literature
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Computer simulations reveal how photoinduced chemical reactions can be exploited to create long-range order in binary and ternary polymeric materials. The process is initiated by shining a spatially uniform light over a photosensitive AB binary blend, which thereby undergoes both a reversible chemical reaction and pha…
Recent simulations of polymer crystallization have stimulated questions about thermodynamic vs kinetic control of thickness in folded chain crystals. Free energy landscapes and equilibrium crystal thickness L* and width W* are analyzed for a polyethylene-like material with classical nucleation and growth and with a si…
The sonoelectrochemistry of Cu 2+ ions which yields metallic copper with surfactants such as poly( N -vinyl-2-pyrrolidone) and poly(vinyl alcohol) or without any surfactant produced nanocrystalline CuBr (95 wt %) and 5% of metallic copper in the presence of cetyltrimethylammonium bromide. A sonoelectrochemical mechani…
This paper focuses on the effects of the addition of fluorine-containing graft or block copolymer additives composed of 1 H,1 H,2 H,2 H -heptadecafluorodecyl acylate (perfluoroalkyl acylate, PFA) and poly(dimethylsiloxane) macromonomer (PDMS) or PDMS macro-azo-initiator to a microphase-separated membrane consisting of…
In a recent paper, Srinivasan and Sherwood reported that α-resorcinol crystals grow unidirectionally at the {01̄1̄} faces in the vapor phase and suggested that this phenomenon of unidirectional growth is intrinsic to polar crystals. Here, we present a molecular modeling study suggesting a plausible “self-poisoning” me…
The crystalline structure of polyester 6 6 was studied by means of X-ray and electron diffraction and real-space electron microscopy. An orthorhombic unit cell containing eight chain segments with a quasi planar zigzag conformation was derived. The chain axis projection could be defined by a small rectangular cell con…
The reaction of manganese(II) acetate, 1,1,1-tris(hydroxymethyl)methane (H3thme), and triethylamine in methanol leads to the formation of [Mn12O2(OMe)2(thme)4(OAc)10(H2O)4].2MeOH. The [Mn(III)4Mn(II)8] core consists of a central [Mn(III)4O6] rhombus sandwiched by two [Mn(II)4O7] fragments. Frequency-dependent ac susce…
Using in situ polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) and conventional IRAS techniques, the adsorption of NO on Pd(111) was studied from ultra-high-vacuum (UHV) conditions to 400 mbar. New monomeric and non-monomeric high-coverage NO adsorption states were observed at 400 mbar. In…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLiquid Crystal Abrikosov Flux Phase: The Exclusive Wide Thermal Range Enantiotropic OccurrenceChannabasaveshwar V. Yelamaggad, Ammathnadu S. Achalkumar, Nilesh L. Bonde, and Ashish K. PrajapatiView Author Information Centre for Liquid Crystal Research, Jalahalli, Banga…
One-dimensional ZnO nanostructures with different morphologies have been successfully synthesized through a simple round-to-round metal vapor deposition route at 550 degrees C with a zinc powder covered indium film as the source material. The structures and morphologies of the products were characterized in detail by…
The first dendrimers containing P-stereogenic monophosphines as peripheral groups were obtained by reacting the protected BH 3 -LiCH 2 PPhR (R = 2-biphenylyl, 9-phenanthryl) with zeroth- and first-generation chlorocarbosilane dendrimers, followed by treatment with morpholine and subsequent chromatographic purification…
Adsorption and diffusion of pure components and binary mixtures containing methane, ethane, propane, n -butane, isobutane, and hydrogen at 300 K in a variety of configurations of carbon nanotubes (CNTs) have been investigated using configurational-bias Monte Carlo (CBMC) simulations and molecular dynamics (MD) simulat…
The epoxidation of cyclooctene catalyzed by iron(III) [tetrakis(pentafluorophenyl)] porphyrin chloride [(F20TPP)FeCl] was investigated in alcohol/acetonitrile solutions in order to determine the effects of the alcohol composition on the reaction kinetics. It was observed that alcohol composition affects both the obser…
The effect of nitrilotrimethylenephosphonic acid (NTMP) on calcium sulfate dihydrate nucleation has been studied at 25 °C in a batch crystallizer with a related optical device. This paper reports the measurement of the induction period done under different supersaturation ratios ranging from 2.60 to 4.99, while varyin…
The effect of solvent on the growth of hemihedral faces of polar crystals is reviewed. Ample evidence is provided that differences in solvent binding at opposite hemihedral faces is a primary factor leading to differences in their growth rates; in general, the stronger the solvent−surface interaction, the more pronoun…
Two calix[4]azacrowns, capped with two aminopolyamide bridges, were used as ligands for the complexation of lanthanide ions [Eu(III), Tb(III), Nd(III), Er(III), La(III)]. The formation of 1:2 and 1:1 complexes was observed, and stability constants, determined by UV absorption and fluorescence spectroscopy, were found…
Two-dimensional-hexagonal mesoporous silica thin films with aligned mesochannels in one direction at large scales will be favorably applied in optics, electronics, separation technologies, and so forth. We propose herein a new photo-aligning and micropatterning technique for mesochannels of a silica thin film using a…
Hyperbranched polyethoxysiloxanes were prepared via a one-pot synthetic route based on a condensation reaction of tetraethoxysilane with acetic anhydride in the presence of an organotitanium catalyst. Volatile compounds can be fully removed using a thin-film evaporator. According to size-exclusion chromatography and v…
High-performance stationary phases, which provide high resolutions and are stable at high temperatures, are of significant importance in gas chromatographic analysis. Carbon nanotubes are nanosized carbon-based sorbents that have a high surface area and a large aspect ratio and are known to be stable at high temperatu…
A series of hyperbranched poly( l -lactide) (PLLA) copolymers were prepared by copolymerization of dilactide with 2,2-bis(hydroxymethyl)butyric acid (BHB) as an AB 2 comonomer via a combined ring-opening polymerization/AB 2 polycondensation. Stannous 2-ethylhexanoate was used as a catalyst. Apparent molecular weights…