Materials Literature
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NaKLaNbO 5 ( 1 ) and Na 2 K 2 Gd 4 Nb 2 O 13 ( 2 ) were synthesized and crystallized by reacting La 2 O 3 or Gd 2 O 3 with Nb 2 O 5 in molten NaOH/KOH hydroxide salts at 400 and 450 °C, respectively. 1 and 2 adopt related two-dimensional structures, containing anionic metal oxide slabs with alkali metal ions located b…
An extracellular medium-chain-length poly(3-hydroxyalkanoate) (MCL-PHA) depolymerase from an isolate, Pseudomonas alcaligenes LB19, was purified to electrophoretic homogeneity by hydrophobic interaction chromatography using Octyl-Sepharose CL-4B and gel permeation chromatography using Sephadex G-150. The molecular mas…
EDTA-linked beta-cyclodextrin dimer 3 was synthesized from EDTA bis(anhydride) 1 and mono(propylamino)-appended beta-cyclodextrin 2. p-tert-butylbenzoate 5, bound by the beta-cyclodextrin cavities of 3 with an association constant of 10(4) M(-1) in water, acts as a sensitizer for the Eu(III) and Tb(III) complexes of 3…
Pd L-edge XANES and Pd K-edge XANES/EXAFS have been studied to investigate the electronic configuration and local structure of Pd in a new perovskite LaPdO3, which was prepared under high pressure. A white line in the Pd L-edge XANES for LaPdO3 is positioned just in the middle of those for divalent (PdIIO) and tetrava…
In atom lithography with optical masks, deposition of an atomic beam on a given substrate is controlled by a standing light-wave field. The lateral intensity distribution of the light field is transferred to the substrate with nanometer scale. We have tailored a complex pattern of this intensity distribution through d…
The influence of pressure on the structure and magnetic properties of the layered hybrid compounds ${\mathrm{Cu}}_{2}(\mathrm{OH}{)}_{3}(n\ensuremath{-}{\mathrm{C}}_{m}{\mathrm{H}}_{2m+1}{\mathrm{CO}}_{2})\ensuremath{\cdot}z{\mathrm{H}}_{2}\mathrm{O}$ is investigated for $m=10$ and 12. It is shown that the distance be…
The hole mobility of a discotic liquid-crystalline triphenylene compound is enhanced by the gelation with hydrogen-bonded fibrous aggregates.
The transport of chloroform in films of semicrystalline syndiotactic polystyrene (s-PS) in its nanoporous form (δ-form) has been investigated by gravimetric analysis and time-resolved FTIR spectroscopy. Experimental tests have been performed at 56 °C and at several vapor pressures ranging from 5 to 100 Torr. Sorption…
Ozonization of the sidewalls of single-wall carbon nanotubes (SWNT) has been investigated by means of 2-layered ONIOM(B3LYP/6-31G*:AM1) calculations. The theoretical calculations reveal that the 1,3-dipolar cycloaddition (1,3-DC) of ozone (O 3 ) onto the sidewalls of a (5,5) carbon nanotube is site-selective and facil…
We report the synthesis of CdS quantum dots inside 3D hexagonal mesoporous silica films using a very simple chemical route that can be generalized to other II−VI semiconductors. X-ray diffraction and electron microscopy characterizations unambiguously demonstrate that the mesoporous structure allows to control the par…
Thermoresponsive ultrathin hydrogels were prepared by the sequential chemical reaction of poly(vinylamine- co - N -vinylisobutyramide) [poly(VAm- co -NVIBA)] and poly(acrylic acid) (polyAAc) on a gold surface. The carboxyl group of polyAAc was activated by 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide hydrochloride…
X-ray crystallography has traditionally been limited to the study of the ground-state structure of molecules and solids. Recent technical advances are removing this limitation as demonstrated here by a time-resolved stroboscopic study of the photo-induced 50 micros lifetime excited triplet state of the [Pt(2)(pop)(4)]…
IN the past approximately 50 years, impressive advances have been made in theproduction of synthetic polymer films designed to protect foods, pharmaceuticals, and other products and to perform other functions such as mulching. With the increasing population and stress on limited resources and the environment, uses of…
We study the appearance and evolution of an array of parallel cracks in a thin slab of material that is directionally dried, and show that the cracks penetrate the material uniformly if the drying front is sufficiently sharp. We also show that cracks have a tendency to become evenly spaced during the penetration. The…
A version of the magnetoimpurity theory of the colossal magnetoresistance materials suitable for the double exchange ferromagnetic nondegenerate semiconductors is presented. It provides an explanation of the nonmonotonic temperature dependence for the charge carrier density in them when it displays first a maximum and…
Three different categories of blend interfaces are examined systematically in order to isolate the role of the interface in the development of cocontinuous morphologies during melt mixing. They are Type I, compatible binary blends based on high-density polyethylene (HDPE)/styrene−ethylene−butylene−styrene (SEBS) and H…
Chiral nanotubes of polyaniline (PANI) were successfully synthesized by a template-free method in the presence of (S)-(−)-2-pyrrolidone-5-carboxylic acid [(S)-PCA)] or (R)-(+)-2-pyrrolidone-5-carboxylic acid [(R)-PCA] as the dopant for the first time. The tubular morphologies of the resulting PANI–(S)-PCA and PANI–(R)…
Novel poly(2,7-carbazole)s (i.e., poly( N -octyl-2,7-carbazolediyl) and poly( N -(4-hexylbenzoyl)-2,7-carbazolediyl)) and their alternating thiophene, bithiophene, and 3,4-ethylenedioxy-2,5-thienylene copolymers have been investigated by cyclic voltammetry, UV−vis spectroelectrochemistry, electrochemical quartz crysta…
Nanocomposite materials were obtained from a colloidal suspension of high aspect ratio β chitin whiskers as the reinforcing phase and poly(caprolactone) as the matrix. The chitin whiskers, prepared by acid hydrolysis of Riftia tubes, consisted of slender parallelepiped rods with an aspect ratio close to 120. A procedu…
A new approach for the modelling of diffraction patterns without using analytical profile functions is described and tested on ball milled f.c.c. Ni powder samples. The proposed whole powder pattern modelling (WPPM) procedure allows a one-step refinement of microstructure parameters by a direct modelling of the experi…