Materials Literature
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The lanthanide stannates, Ln2Sn2O7, Ln=La-Lu and Y, have the isometric pyrochlore structure, A2B2O7, and their structural properties have been refined by Rietveld analysis of powder neutron and synchrotron X-ray diffraction data. In this study, the enthalpies of formation of selected stannate pyrochlores, Ln=La, Nd, S…
Highly dispersed and debundled carbon nanotubes were prepared in an aqueous solution of lysozyme using a combination of ultrasonication and ultracentrifugation. The product is a pH-sensitive dispersion, which remains in a highly dispersed state at pH<8 and pH>11, but in an aggregated state at pH 8-11. Photoluminescenc…
A wet and dry paper! Tungsten oxide films prepared by a facile electrochemical deposition process provide the first example of a dual surface functionality. The reversible switch of wettability between superhydrophobicity and superhydrophilicity is realized by alternating irradiation with UV light and storage in the d…
Structural, electrical, and thermal transport properties of CoSb 3 partially filled with indium are reported. Polycrystalline samples of In x Co 4 Sb 12 (0 ≤ x ≤ 0.3) were prepared by solid-state reaction under a gas mixture of 5% H 2 and 95% Ar. The solubility limit of the indium filling voids in CoSb 3 was found to…
Changes in the work function $\ensuremath{\Phi}$ of metal surfaces upon deposition of ultrathin oxide films have been studied by means of band structure density functional theory calculations. Four systems have been considered: $\mathrm{MgO}∕\mathrm{Ag}(100)$, $\mathrm{MgO}∕\mathrm{Mo}(100)$, ${\mathrm{TiO}}_{2}∕\math…
Partially coating perpendicularly aligned carbon nanotube arrays with an appropriate polymer thin film along their tube length provides a novel concept for developing new sensors of high sensitivity, good selectivity, and excellent environmental stability for the detection of a broad class of chemical vapors with low…
Highly porous fibers of various polymers were created by electrospinning with a modified collector. A bath of liquid nitrogen was used to freeze the fibers, inducing a phase separation between the polymer and the solvent. When the solvent was removed in vacuo, highly porous fibers were obtained. Poly(styrene), poly(ac…
When polyelectrolyte-neutral block copolymers are mixed in aqueous solutions with oppositely charged species, stable complexes are found to form spontaneously. The mechanism is based on electrostatics and on the compensation between the opposite charges. Electrostatic complexes exhibit a core-shell microstructure. In…
Anisotropic II-VI semiconductor nanocrystals and nanoparticles have become important building blocks for (potential) nanotechnological applications. Even though a wide variety of differently shaped nanoparticles of this class can be prepared, the underlying mechanisms are mostly not fully understood. This Review artic…
This work reports on structural and magnetic investigations of the Heusler compound Co2FeSi. X-ray diffraction and Mößbauer spectrometry indicate an ordered L21 structure. Magnetic measurements by means of x-ray magnetic circular dichroism and magnetometry revealed that this compound is, currently, the material with t…
During the last years, several groups across the world have concentrated on the adaptation and further development of electrospinning (e‐spinning) to enable ceramic fiber synthesis. Thus far, more than 20 ceramic systems have been synthesized as micro‐ and nanofibers. These fibers can be amorphous, polycrystalline, de…
Poly(amidoamine) (PAMAM) dendrimer-based multifunctional cancer therapeutic conjugates have been designed and synthesized. The primary amino groups on the surface of the generation 5 (G5) PAMAM dendrimer were neutralized through partial acetylation, providing enhanced solubility of the dendrimer (in conjugation of FIT…
Abstract Poly( N‐ isopropylacrylamide ‐co‐ sodium acrylate) copolymer brushes grafted on SiO 2 ‐coated quartz crystal surface were prepared with a surface‐immobilized initiator. The collapse and swelling of the thermally sensitive copolymer brushes in water were studied with quartz crystal microbalance in situ . The f…
Superactivated carbon and carbon nanotubes are both considered potential hydrogen carriers. Adsorption isotherms of H2 on activated carbon AX-21 and multi-wall carbon nanotubes were collected with a volumetric method for the temperature range of 77, 233–298 K and pressures up to 7 or 10 MPa. Based on the experimental…
A method of rapid capillary sample loading of either dry powder or polycrystalline slurry has been developed. By embedding a Millipore filter in a Kapton capillary tube, one can then draw either loose dry powder or polycrystalline slurry into the tube and pack the solid against the filter, creating a dense column of p…
A sharp maximum in the temperature dependence of the relaxation time obtained from low-frequency permittivity measurements is found in the quasi-one-dimensional conductor (TMTTF) 2 AsF 6 at a temperature of 101 K. This maximum is associated with the second-order phase transition into a charge-ordered state of Wigner t…
Orientation maps similar to electron backscatter diffraction maps can be obtained in a transmission electron microscope. A method of such mapping by automatic indexing of electron diffraction patterns has been proposed recently. The procedure is relatively simple and fast but it does not avoid the 180° ambiguity. Usin…
Abstract Summary: Due to its unique combination of properties, PTT is a promising material for textile fibre and engineering thermoplastic applications, both as neat polymer and in formulated products. To bring down the cost yet keeping some of its advantageous properties it seems interesting to apply PTT in blends an…
Abstract The Keggin dodecatungstoarsenato anion of HNa 2 [AsW 12 O 40 ] is inherently unstable in aqueous hydrogen peroxide and is mainly degraded to [AsO 4 {W 2 O 2 (μ‐O 2 ) 2 (O 2 ) 2 } 2 ] 3– , [HAsO 4 {W 2 O 2 (μ‐O 2 ) 2 (O 2 ) 2 }] 2– and [{WO(O 2 ) 2 (H 2 O)} 2 (μ‐O)] 2– . These anions were isolated as salts and…
Abstract The ordered honeycomb structures of poly( L ‐lactic‐ co ‐glycolic acid) and poly( D , L ‐lactic‐ co ‐glycolic acid) fabricated in a humid atmosphere were reported in this paper. It was found that surfactants were important in the formation of honeycomb films of hydrophobic polymer. The affecting factors, such…