Materials Literature
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Abstract A novel ruthenium-containing silicotungstate of [(CH3)2NH2]8K2H2[(γ-SiW10O36)2Ru4Cl4O2(OH)4]·23H2O (1) was obtained as a single crystal suitable for X-ray crystallographic analysis by the reaction of a divacant lacunary γ-Keggin silicotungstate K8[γ-SiW10O36] with K2[RuCl5(OH2)]. The unprecedented dimeric sil…
We investigate surface morphology and crystalline structure of biodegradable polymers poly(3-hydroxybutyrate) (PHB) and its random copolymer poly(3-hydroxybutyrate- co -3-hydroxyhexanoate) (P(HB- co -HHx), HHx = 12 mol %) using surface-sensitive techniques. Surface region typically to a depth of about 10 nm of polymer…
Ferroelectric domains induced in pressureless‐sintered BaTiO 3 ceramics by the cubic to tetragonal phase transformation at Curie point T C ≈130°C have been analyzed using electron‐backscatter diffraction (EBSD) equipped with the scanning electron microscope. The EBSD technique with built‐in automatic indexing algorith…
Abstract Using X-ray diffraction (XRD) analysis, the porous structure of isotactic (it-) poly(methyl methacrylate) (PMMA) thin films fabricated with layer-by-layer (LbL) assembly of it-PMMA and syndiotactic (st-) poly(methacrylic acid) (PMAA) was observed for the first time. The XRD patterns of crystalline it-PMMA on…
Nucleation of diamonds on Si substrates was pronouncedly improved by pre-coating a thin tungsten film on the substrates, which is attributed to the enhancement on the formation of the W−C phase in the tungsten silicon interface. The fact that the W coating can enhance the generation of the W−C phase for the W/Si subst…
The structure relaxation mechanism of the fluorapatite (100) surface under completely hydrated ambient conditions has been investigated with the grazing incidence X-ray diffraction (GIXRD) technique. Detailed information on lateral as well as perpendicular ordering corresponding to the water molecules and atomic relax…
A new type of heteropolyanion containing mixed-valence antimony, [Sb4(V)Sb2(III)Mo18O73(H2O)2](12-) (1a), and its four derivatives, {M(H2O)2[Sb4(V)Sb2(III)Mo18O73(H2O)2]2}(22-) (M = Mn(II), Fe(II), Cu(II), or Co(II)) (2a-5a), have been isolated as ammonium salt, and their structures were determined by single-crystal X…
The amphiphilic block copolymer polystyrene- block -poly(acrylic acid) (PS- b -PAA) forms micelles in toluene that can be cast onto a planar substrate to create quasi-hexagonal arrays of spherical PAA domains in a PS matrix. Treatment of these ultrathin films with an appropriate selective solvent swells the PAA domain…
Effects of changing the interparticle separation on the surface plasmon bands of ultrathin films of gold nanoparticles have been investigated by examining the interaction of alkanethiols of varying chain length on nanocrystalline gold films generated at the organic-aqueous interface. Adsorption of alkanethiols causes…
In this study, varieties of lipid bilayer-protected gold nanoparticles (AuNPs) were synthesized through a simple wet chemical method, and then the effect of freeze-thawing on the as-prepared AuNPs was investigated. The freeze-thawing process induced fusion or fission of lipid bilayers tethered on the AuNPs. The UV-vis…
Modifications of the optical properties of poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] induced by fluorination of the vinylene units are investigated by means of time dependent density functional theory (TD-DFT) calculations and spectroscopic measurements in solution. The energy of the main absorption…
A series of well-defined functional gelable diblock copolymers, poly(3-(triethoxysilyl)propyl methacrylate)- block -poly(2-vinylpyridine) (PTEPM- b -P2VP), were synthesized by a two-step reversible addition−fragmentation chain transfer (RAFT) mediated radical polymerization procedure. The self-assembly of PTEPM- b -P2…
The structure and mechanical properties of clay nanoparticles is a subject of growing interest because of their numerous applications in engineering. We present the results of molecular dynamics simulation for a single nanoplate of pyrophyllite - a 2:1 clay mineral consisting of two tetrahedral sheets of SiO4 and an i…
The properties of thermally reversible organogels that are formed spontaneously upon mixing a phosphonic acid monoester, monophosphonic acid, or bisphosphonate ester, each containing a long alkyl chain substituent, with one of several compounds of aluminum(III) and boron(III) in an organic liquid were studied by IR, N…
Wedge-shaped molecules with a sulfonic group at the tip have been incorporated into a poly(2-vinylpyridine)- b -poly(ethylene oxide) (P2VP- b -PEO) diblock copolymer via proton transfer at different degrees of neutralization. The protonation of P2VP was monitored by means of Fourier transform infrared spectroscopy and…
The fluorescence signal of single organic fluorophores is characterized by random blinking and irreversible photobleaching. Photoinduced blinking of Cy5 has posed various limitations of this popular near-infrared (NIR) probe in biological applications. Here we show that fluorophore-metal nanoparticle (NP) complexes gr…
This paper describes a general method to change the surface property of the oleic acid stabilized silver nanoparticles and successful tranferring of the silver nanoparticles from the organic phase into the aqueous phase. By vigorous shaking of a biphasic mixture of the silver organosol protected with oleic acid and p-…
Nanosized barium titanate powders were synthesized by a hydrothermal method. The effect of titania precursors on the phase transition of BaTiO 3 with respect to Ba/Ti ratio, reaction temperature, reaction time, and calcination temperature was investigated. The synthesized materials were characterized by X-ray diffract…
The reactions of BF 3 ·OEt 2 with four triaryl corroles (H 3 Cor) give the complexes [(B 2 OF 2 )(Cor)] - in which the corrole acts as a binucleating ligand. The new complexes were fully characterized, including an X-ray crystal structure of the triphenylcorrole complex. Density functional theory calculations support…
Highly selective enrichment of (6,5) and (8,3) SWCNTs (above 85% of the semiconducting tubes) was achieved through multistep extraction by sodium dodecyl sulfate (SDS) and sodium cholate (SC) cosurfactant solution from narrowly (n,m) distributed SWCNTs produced by the catalyst Co-MCM-41. A systematic change in the chi…