Materials Literature
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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…
The electronic structure of the (001) and (110) surfaces for $B2$ Ti-based transition metal alloys were investigated using the full-potential linearized augmented plane-wave method in the local-density approximation. The evolution of the electronic structure of alloys at the different surfaces in comparison with the b…
Abstract The effect of compatibilizing polycarbonate (PC) and LC5000, a thermotropic liquid crystalline polymer consisting of 80/20% of hydroxybenzoic acid and poly(terephthalate) with a laboratory synthesized compatibilizer was studied. The compatibilizer was synthesized by transesterification of PC and LC5000 with t…
The evaluation of skin surface contours can be carried out by various techniques, including the use of a stylus profilometer, a laserprofilometer and a conventional optical profilometer (COP). But these methods have some drawbacks because their data are basically obtained from two-dimensional algorithms. So a new tech…
We present an experimental and theoretical investigation of the optical absorption and Raman spectra of electropolymerized poly(para-phenylene) (PPP) and related oligomers. Experimental data include also the photoluminescence spectra of all these polymeric compounds. Theoretical calculations of the band shapes of both…
Abstract A quadrupole mass spectrometer coupled to a thermobalance has been used to develop a controlled rate thermal analysis (CRTA) equipment. This instrument maintains constant the partial pressure of the gas generated in a solid–gas reaction during the entire process while recording the weight loss along the proce…
[structure: see text] A new approach to polyacetal systems using sequential transacetalation and protection-deprotection techniques was developed for the preparation of macromolecular polyacetals and applied to secure new dendrimers with 2,4,8,10-tetraoxaspiro[5,5]undecane dendrons from pentaerythritol and polyaldehyd…