Materials Literature
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We compare different methods for particle size determination in nanocrystalline anatase (TiO 2 ) powders: transmission electron microscopy (TEM), nitrogen adsorption measurements, mercury porosimetry, and X-ray diffraction (XRD). The main source of errors in TEM is the sampling of the powder population, whereas in XRD…
The synthesis and optical properties of single crystalline gold nanoprisms have been investigated. A three-step mediated seed growth process in an aqueous solution generated gold nanoprisms with a relatively homogeneous size distribution. The purity of these nanostructures has allowed us to observe a weak quadrupole r…
A caesium thorium(IV) silicate has been synthesized serendipitously under high-temperature solid-state conditions by the reaction of ThIV with a fused silica/alumina reaction crucible. The compound crystallizes in the orthorhombic space group Pca21. The crystal structure consists of ThO6 distorted octahedra corner-sh…
We study phonon dispersion in layered prismatic nanowires that can have an arbitrary cross-sectional geometry. We calculate phonon dispersion using a hybrid analytical/numerical approach that models propagation along the wire analytically, but deformation in the plane of the cross section using the finite element meth…
Abstract Successfully we prepared crystalline compounds of [Mo36O112(H2O)16]8− ({Mo36}) anion with various α,ω-alkanediamines (Cn-DA, n = 3–11) aiming at crystal engineering with nanosized building blocks. 2-, 1-, and 0-D frameworks of {Mo36} were obtained depending on length of alkane moiety of Cn-DA. These framework…
We compare the interface properties of various 1,4,8,11,15,18,22,25 octa-alkyl-substituted zinc phthalocyanines [(But)8PcZn,(Hep)8PcZn,(Dec)8PcZn] with those of unsubstituted zinc phthalocyanine (PcZn) on gold using x-ray photoemission spectroscopy and valence band ultraviolet photoemission spectroscopy. Although the…
The influence of guest size on the guest exchange behavior of the δ form of syndiotactic polystyrene was investigated using a series of n -alkanes from n -hexane to n -decane as a guest. The bands due to sorbate and desorbate molecules and the conformational sensitive bands of sPS were followed by ATR-FTIR spectroscop…
The origin of the colossal magnetoresistance (CMR) observed in La 1− x Ca x MnO 3 , at x ≈ 0.3, is still largely debated. Actually, the precursor phase of the ferromagnetic (F) metallic state, defined as the concentration ranges 0.125 ≤ x Ca < 0.22 and 0.1 ≤ x Sr < 0.17 in La 1− x Ca x MnO 3 and La 1− x Sr x MnO 3 sys…
We have synthesized and characterized the type-II germanium clathrate ${\mathrm{Cs}}_{8}{\mathrm{Ge}}_{136}$. The cesium atoms are ordered in structure, occupying the larger hexakaidecahedra while the smaller dodecahedra are basically empty. Band structure and electrical resistivity data indicate that ${\mathrm{Cs}}_{…
A systematic scheme for the experimental determination of isobaric solid−liquid equilibrium (SLE) phase diagrams at atmospheric pressure is presented. Driven by process objectives and aided by techniques for representing/visualizing phase diagrams, the scheme helps to generate such diagrams exhibiting features (for ex…
Using time-dependent density-functional theory, we show that the first singlet excitations of a series of icosahedral, dodecahedral, and tetrahedral clusters are optically forbidden and that their optical absorption gaps and spectral properties are size, shape, and composition dependent and can be tuned broadly in the…
M\"ossbauer spectroscopy of ${\mathrm{La}}_{0.7\ensuremath{-}x}{\mathrm{Dy}}_{x}{\mathrm{Ca}}_{0.3}\mathrm{Mn}(\mathrm{Fe}){\mathrm{O}}_{3}$ shows phase separation, both above and below ${T}_{C}$. The behavior in the two regions are independent and related to different phenomena. Above ${T}_{C}$, the phase splitting i…
The significant increase in the Young's modulus of nanotube-polymer composites is often correlated with the formation of a crystalline layer of polymers surrounding the nanotubes. Although the improved stress transfer between the stiffer nanotube and the softer polymer matrix has been attributed to the presence of thi…
Mononuclear gold complexes bonded to TiO(2) were synthesized from Au(CH(3))(2)(C(5)H(7)O(2)), and their decomposition and conversion into gold nanoclusters on the TiO(2) surface were characterized by time-resolved X-ray absorption and infrared spectroscopies as the temperature of the sample in flowing helium was rampe…
In this work, conditions of Suzuki condensation and polymer modification of polymers of benzene and fluorene units have been studied. A new polymer was prepared with statistical equimolecular amounts of two 2,7-dibromo-9,9-bis(6‘-susbtituted-hexyl)fluorene as starting monomers. The C9 position of the poly[9,9-bis(6‘-b…
Abstract The phase structure and clay dispersion in polyamide‐6(PA6)/polypropylene(PP)/organoclay (70/30/4) systems with and without an additional 5 parts of maleated polypropylene (MAH‐g‐PP) as a compatibilizer were studied with atomic force microscopy (AFM). AFM scans were taken from the polished surface of specimen…
In this study, we report the application of synchrotron radiation microprobe to the analysis of Mn-rich clusters in GaN. From the Mn and Ga fluorescence line intensity ratio, an average Mn concentration of 11% was deduced. A combination of fluorescence mapping with spectroscopic techniques enabled us to examine not on…
Syndiotactic polystyrene (s-PS) films including a fluorescent guest (naphthalene, NP) in their nanoporous δ crystalline phase have been prepared and characterized by X-ray diffraction, infrared linear dichroism, molecular modeling, and fluorescence depolarization techniques. A nearly perpendicular orientation of the f…
The synthesis and characterization of a series of liquid crystal tetramers is reported. These consist of molecules containing four liquid crystal units connected via three flexible alkyl spacers. The length of the central spacer is held at six methylene units, while that of the outer spacers is varied from three to tw…
Abstract Blends of polyamide‐1010 (PA1010) and a thermoplastic poly(ester urethane) elastomer (TPU) were prepared by melt extrusion. The impact properties, phase structure, compatibility, and fracture morphology under impact were investigated for PA1010/TPU blends. The results indicated that TPU enhanced the impact st…