Materials Literature
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Abstract Graft copolymers of bacterial polyesters were prepared by direct condensation of poly(3‐hydroxyoctanoate‐ co ‐9‐carboxy‐3‐hydroxydecanoate) (PHOD) and poly(ethylene glycol) (PEG) or poly(lactic acid) (PLA). Nanoparticles from PHO, PHOD, PHOD‐ g ‐PEG, and PHOD‐ g ‐PLA were obtained by solvent displacement with…
We used field-theoretic simulations to study the equilibrium behavior of a polymer solution under good solvent conditions confined to a slit of width L. In particular, we obtained the chemical potential and the density profiles across the slit for different values of the monomer excluded volume over a wide range of co…
Using the inherent structure formalism originally proposed by Stillinger and Weber [Phys. Rev. A 25, 978 (1982)], we generalize the thermodynamics of an energy landscape that has an ideal glass transition and derive the consequences for its equation of state. In doing so, we identify a separation of configurational an…
Realistic molecular simulations agree with previously published surface force experiments that n-dodecane confined between mica surfaces displays shear-thinning starting at shear rate orders of magnitude less than in the bulk fluid. We probe the origin of this behavior by studying rotational and diffusional relaxation…
A series of easy to prepare organic salt based on imidazole derivatives and cyclobutane-1,1-dicarboxylic acid have been studied for their gelation behavior after it was found that imidazolium hydrogen cyclobutane-1,1-dicarboxylate ( 1 ) can harden few organic liquids. 1 forms remarkably stable gel (remains intact for…
Nanowassertropfen: Polyoxometallat-Container/Cluster können Schalen von Wassermolekülen enthalten. An den Oberflächen der Cluster befinden sich Poren, die im offenen Zustand Zutritt zum Clusterinneren gewähren (siehe Bild: Vier der zwanzig Poren sind erkennbar sowie eines der sechs eingeschlossenen Na+-Ionen in Violet…
The unique behavior of a new Ru(II) diimine complex, Ru(bpy)(2)(L)(2+) (where L is 4-methyl-4'-[p-(dimethyl- amino)-alpha-styryl]-2,2'-bipyridine, bpy is 2,2'-bipyridine), was studied in detail. Due to the strong electron donating property of the amino group, an ILCT (intraligand charge transfer) state is involved eit…
Crystal clear! The routine collection of near single-crystal-quality diffraction data from a powdered sample is possible by exploiting the anisotropic thermal expansion of a molecular solid to enhance the extraction of diffracted intensities from a heavily overlapped powder diffraction pattern. The method is validated…
Modeling exercises on the size-induced blue-shift in the photoluminescence (PL) of nanosolid Si ( J. Phys. Chem . B 2002, 106, 11725) have been extended herewith to the size dependence of the Si-2p energy-level-shift measured using X-ray photoelectron spectroscopy (XPS). Results show consistency in both the origin and…
Fischer−Tropsch (FT) synthesis with Co catalysts supported on mesoporous silica (SBA-15) with narrow pore size distribution has been carried out with a fixed bed stainless steel reactor at 503 K and 2.0 MPa. When 20 mass % Co is supported on SBA-15 with an average pore diameter of 8.6 nm by using an ethanol solution o…
A prism grating using polymer stabilized liquid crystal was fabricated and its diffraction characteristics evaluated. Such a prism grating exhibits not only a periodic grating structure but also a prism-like gradient refractive index within each grating period. As a result, the diffraction behavior is asymmetric. The…
Zinc sulphide nanoparticles doped with manganese (ZnS:Mn) have been stabilized using thioglycerol [HSCH2CH(OH)CH2OH] molecules. The nanoparticles (∼1.7 nm) are highly stable and exhibit photoluminescence at ∼600 nm when excited with ultraviolet light. For increasing luminescence and stability the particles are further…
The electronic structure and the nature of optical transitions in oxygen dangling bond in silica glass, the nonbridging oxygen hole center (NBOHC), were calculated. The calculation reproduced well the peak positions and oscillator strengths of the well-known optical absorption bands at 2.0 and 4.8 eV, and of the recen…
Polyelectrolytes with small hydrophobic substituents bind to vesicles composed of cyclodextrin molecules through inclusion of the hydrophobic substituents on the polymers into the cyclodextrin cavities at the vesicle surface (see schematic representation). Molecular recognition results from a subtle balance of multipl…
An empirical potentials molecular dynamics method was used to simulate the $\ensuremath{\alpha}$-recoil effects in the lanthanum zirconate pyrochlore ${\mathrm{La}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7},$ at 350 K, where a tetravalent uranium ion was used as the primary knock-on atom with a kinetic energy of 6 keV. The…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFabrication of Stable Hollow Capsules by Covalent Layer-by-Layer Self-AssemblyYongjun Zhang, Shuguang Yang, Ying Guan, Weixiao Cao, and Jian XuView Author Information State Key Laboratory of Polymer Physics and Chemistry, Center for Molecular Science, Institute of Chemistry, Ch…
A high-temperature shape-memory alloy, Ni54Mn25Ga21, was developed with a shape-memory effect of 6.1% and a martensitic transformation temperature higher than 250 °C for single crystals. The measured compressive strength and strain were 845 MPa and 20.5%, respectively, with a compressive axis along the growth directio…
The kinetics of disorientation of polymer layered silicate nanocomposites following alignment of the silicate layers by prolonged large amplitude oscillatory shear are examined using linear viscoelastic measurements. Nanometer thick disks with diameters of 30 nm, 0.3−0.6 μm, and 5 μm dispersed in polymer matrices exhi…
Ace of diamonds: Cyclohexamantane (C26H30), a large diamond-like molecule containing six peri-fused adamantane cages was identified in petroleum and its structure proven by X-ray crystallography (see picture). Never synthesized because of severe mechanistic difficulties, the structure of cyclohexamantane has appeared…
We present the first observation of a prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V2O3 and report new spectral calculations that combine the local-density approximation with the dynamical mean-field theory (using quantum Monte Carlo simulations) to show the development of such a…