Materials Literature
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To obtain the better ZrB2/Al(OH)3–Y(OH)3 core-shell composite particles, ZrB2 particles must be adequately dispersed during the coating process. In this article, the dispersibility of ZrB2 particles in the ZrB2 suspension is investigated via the sedimentation method. Through test and analysis, the dispersibility is ra…
Abstract A mechanism for the generation of the compositional gradient along the long axis for poly( ε ‐caprolactone) (PCL)/poly(ethylene oxide) (PEO) blend under uniaxial thermal gradient was proposed by observations of the convection of polymer using graphite powder as a visual probe. The convection under the thermal…
The following recent results on growth transitions and crystal morphology of isotactic polypropylene (iPP) are presented: a) observation of a hitherto unsuspected low-temperature growth transition between β and α phases; b) structural characterization and experimental check of the γ phase which is made of chains with…
GaMnN films grown by metal-organic chemical vapor deposition were studied by photoluminescence (PL) spectroscopy and hysteresis measurements. Depending on the growth conditions of these GaMnN films, hysteresis measurements along the easy axis of magnetization show a transformation from magnetic to nonmagnetic behavior…
The biaxial order reconstruction in nematics (BORN) is a dynamical effect which can change the topology of nematic textures. The BORN can be induced in a nematic material submitted to strong external constraints, as in the case of bulk textural distortions due to an electric field in a π cell. In this work, we show ho…
Abstract There are some major advantages to be gained in processing micronic europium doped yttrium oxide Y 2 O 3 particles for phosphor applications using spray pyrolysis. To better understand the influence of the operating conditions and also why hollow particles are formed, a complete one‐dimensional modeling of th…
A survey for the osmotic equilibrium between solution and a pure solvent as well as for the swelling pressure eqilibrium between a gel and pure solvent is given, where phase transitions of the pure component are allowed to occur. The equilibrium temperature/concentration curves are presented for constant osmotic and s…
The substrate specificity of the two polymerases (PhaC1 and PhaC2) involved in the biosynthesis of medium-chain-length poly-hydroxyalkanoates (mcl PHAs) in Pseudomonas putida U has been studied in vivo. For these kind of experiments, two recombinant strains derived from a genetically engineered mutant in which the who…
In this work, we focus on hierarchical relaxation in complex systems. Two means of describing relaxation are considered in detail: first, we use a microscopic model based on continuous-time random walk (CTRW) ideas; this procedure is efficient in describing photoconductive behavior and is used here also in the framewo…
The classical theories for overall crystallization kinetics are first reviewed, then discussed and extended. To model the crystallization phenomena during polymer processing, we have chosen an extension of Ozawa’s theory which allows an easy determination of the kinetic parameters from anisothermal DSC experiments. Th…
The modification of the conformation of proteins adsorbed on different mineral surfaces was followed indirectly using two methods. Firstly, the effect of the pH on enzyme activity of two β -D-glucosidases on different mineral surfaces was studied; a diminished activity would indicate a departure from the active confor…
Nanoporous layered double hydroxide (LDH) materials have wide applications, ranging from being good adsorbents for gases (particularly CO(2)) and liquid ions to membranes and catalysts. They also have applications in medicine, environmental remediation, and electrochemistry. Their general chemical composition is [M(1-…
The adsorption of paraquat (1,1′-dimethyl-4,4′-dipyridinium chloride) on montmorillonite, illite, and kaolinite was investigated. The organic cation was strongly adsorbed up to the cation exchange capacity (CEC) of montmorillonite and illite. On kaolinite, adsorption took place only up to 57% of the CEC. From the low…
Dilution of contact, hard sphere-like, nanoparticle-nanoparticle interactions upon mixing plays a key role in explaining nanoparticle dispersion in athermal all-polymer nanocomposites, as illustrated for polystyrene-nanoparticle/linear-polystyrene blends as a model system.
The relation between main- and normal-mode relaxation is studied on poly(propyleneoxide) of different molecular weights by dielectric measurements in a very large frequency range. The evaluation by a special technique shows a merging of α -relaxation and of normal-mode relaxation at an essential higher temperature tha…
The optical transitions in ensembles of colloidal CdSe-based quantum dots (QDs) have been systematically studied as a function of the net QDs’ polarity/polarization and of the solvent’s polarity. While the general trend observed for all QD systems dispersed in different solvents is similar, the spectral shifts are mor…
We describe a method to selectively position single-walled carbon nanotubes (SWNTs) modified with a [2.2]paracyclophane derivative (PCP) containing conjugated acetylenic triple bonds in the linear side-chain on fluorine doped tin oxide (FTO)/glass substrates. The method exploits the use of metallic grids as masks put…
Investigations of tilt angle, spontaneous polarization and Low frequency (5 Hz - 10 MHz) dielectric relaxations are reported in a chiral hydrogen bonded liquid crystal, HBFLC, viz., 11 bpa. Isotropic to chiral nematic (IN*) and chiral nematic to chiral smectic-C (N*SmC*) phase transition temperatures determined by die…
Most of the properties of the polydimethylsiloxane (PDMS) oils can be deduced from the structure of the linear polymeric chain of the macromolecule, including flexibility and stability of the Si-O-Si backbone, and hydrophobicity of the methyl substituents of the silicon atom.But in fact, the advantages of pure PDMS fo…
The paper demonstrates how a characterization of unfilled, amorphous rubber networks can be evaluated from uniaxial stress-strain measurement data. A network model is proposed that includes finite chain extensibility, topological constraints, and a trapped entanglement constribution to the reduced stress, which does n…