Materials Literature
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The hydrothermal reaction of 3-aminopropyltriethoxysilane (APTES) and nickel acetate tetrahydrate at 170 °C results in a layered nickel silicate, Ni 3 Si(C 3 H 6 NH 3 )F 0.65 O 1.9 (OH) 4.45 (CH 3 COO) 1.1 · x H 2 O, x = 0.38, with an interlayer spacing of 21 Å. The molecular structure is deduced from powder X-ray dif…
Adherent and uniform films of zinc sulfide have been deposited reproducibly by chemical bath deposition (CBD), onto low iron content microscope slides, under acidic conditions from solutions containing zinc(II) chloride, urea and thioacetamide. In situ measurements using a quartz crystal microbalance suggest that film…
High loading, three-dimensionally ordered macroporous (3DOM) hybrid silica materials based on monovacant Keggin-type polyoxometalates (POMs) [Xn+W11O39](12 − n)− (XW11; Xn+ = P5+, Si4+, Ge4+, B3+) were prepared via sol–gel as well as templating techniques. XW11 clusters were incorporated into the wall structures of ma…
Well-aligned ZnO nanorods have been grown on Si (100) substrates using a simple, catalyst-free CVD method at low temperatures. Structural analyses show that the nanorods grown on Si (100) are preferentially oriented in the c-axis direction. An amorphous SiOx layer in the interface of ZnO nanorods and Si (100) is obser…
A facile and selective route based on a precipitate slow-release controlled process was developed to produce both high-quality MnSe 2 and α-MnSe uniform microcrystals in aqueous solution at low temperatures (100−180 °C). The magnetic properties of the two samples were investigated in detail. This synthetic method will…
The nature of magnetic orbitals is analyzed on a series of five Cu(d 9 )···Cu(d 9 ) complexes, comparing various theoretical approaches. The magnetic orbitals are usually defined from ab initio mean-field calculations. It is shown that they are practically identical for the lower and upper multiplets. Diagonalization…
Herein we report the synthesis and electrochemical characterization of poly(thieno[3,4- b ]thiophene), a new low band gap conducting polymer with a high redox switching stability that exhibits high optical transparency in the semiconductive state. The monomer, thieno[3,4- b ]thiophene (T34bT), has a low oxidation pote…
We propose that the shape of the equilibrium $T\ensuremath{-}P$ phase diagram of a liquid is strongly correlated with the thermodynamic anomalies and the ease of vitrification. The $T\ensuremath{-}P$ phase diagram of water is characterized by its V shape. By using this specific shape of the phase diagram as a fingerpr…
We report a numerical study of crystal nucleation in a system of weakly charged colloids. The interaction between the colloids is approximated by a repulsive hard-core Yukawa potential. We studied the dependence of the nucleation barrier and the nucleation rate on supersaturation as a function of both contact value an…
The effects of the synthesis parameters on the properties of the cubic Im 3 m SBA-16 have been investigated systematically for the first time. We show that the total pore volume, pore diameter, and ratio micro-/mesopores can be controlled very efficiently by changing the synthesis time, temperature, and the TEOS/surfa…
A new kind of luminescent organic−inorganic hybrid material (denoted Hybrid I) consisting of europium 1,10-phenanthroline complexes covalently attached to a silica-based network was prepared by a sol−gel process. 1,10-Phenanthroline grafted to 3-(triethoxysilyl)propyl isocyanate was used as one of the precursors for t…
In the first decade of the 20th century, nearly a hundred years of work on the phenomenon of Brownian motion culminated in theory and experiments that demonstrated irrefutably the discontinuous or molecular nature of matter. Colloidal suspensions and the phenomenon of Brownian motion thus became the key to confirmatio…
We have studied magnetic and transport properties on different manganese oxide based compounds exhibiting phase separation: polycrystalline La5/8-yPryCa3/8MnO3 (y=0.3) and La1/2Ca1/2Mn1-zFezO3 (z = 0.05), and single crystals of La5/8-yPryCa3/8MnO3 (y=0.35). Time dependent effects indicate that the fractions of the coe…
The dielectric permittivity \ensuremath{\varepsilon} at frequencies from ${(10}^{\ensuremath{-}1}--{10}^{\ensuremath{-}5})\mathrm{Hz}$ to ${10}^{5}\mathrm{Hz}$ is studied in perovskite $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}x{\mathrm{PbTiO}}_{3}$ relaxor fer…
Using molecular-dynamics simulations we study the thermodynamic behavior of a single-component covalent material described by the recently proposed environment-dependent interatomic potential (EDIP). The parametrization of EDIP for silicon exhibits a range of unusual properties typically found in more complex material…
We extend a tight-binding total energy method to include f-electrons, and apply it to the study of the structural and elastic properties of a range of elements from Be to U. We find that the tight-binding parameters are as accurate and transferable for f-electron systems as they are for d-electron systems. In both cas…
Gold nanoparticles coated with stabilizing thiolate monolayers of N-(2-mercaptopropionyl)glycine (tiopronin) and N, N-trimethyl(undecylmercapto)ammonium quench the fluorescence of [Ru(bpy) 3 ] 2+ in aqueous solution. The tiopronin monolayer protected clusters (MPCs) exert energy-transfer quenching by both collisional…
We discuss recent developments and present new findings in the colloidal description of soft polymeric macromolecular aggregates. For various macromolecular architectures, such as linear chains, star polymers, dendrimers, and polyelectrolyte stars, the effective interactions between suitably chosen coordinates are sho…
Polymer−clay nanocomposites of styrene and methyl methacrylate have been prepared by bulk, solution, suspension, and emulsion polymerization as well as by melt blending. Two different organic modifications of montmorillonite have been used: one contains a styryl monomer on the ammonium ion while the other has no doubl…
This paper presents the use of nanoscale chemistry to synthesize a multilevel, hierarchically built nanoparticle, which we define as a nanoclinic, for targeted diagnostics and therapy. This nanoclinic, produced by multistep chemistry in a nanosize micelle, consists of a thin silica shell encapsulating magnetic (Fe 2 O…