Materials Literature
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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…
We found that Sm3+ substitution in SrO(SrTiO3)2 is effective in improving the Seebeck coefficient (S). The ∣S∣ value increases notably with temperature, benefiting from an enhancement of the density of states (DOS) effective mass md* from ∼3m0 (300K)to∼7.5m0 (1000K), due to an improvement of the local symmetry of TiO6…
The synthesis, electrochemical and spectroscopic properties of the new thiophene-substituted metal dithiolene complexes [Ni(b-3ted)2] (3) and [NBu4][Ni(b-3ted)2] ([NBu4][3]) are described [b-3ted = bis(3-thienyl)-1,2-ethylenedithiolene] and compared with new studies of the known compounds [Ni(b-2ted)2] (2) and [NBu4][…
The aim of this article is to present some results of investigations on machined surface quality produced by high-speed cutting technologies and conventional turning. Machined surface quality demands significantly affect cost of production and increase the price of a product. Hence, obtaining a good quality of surface…
The effects of the physical and chemical networks on the relaxation processes and on the morphology of polyester-based polyurethane elastomers were studied by thermal, thermomechanical, and dielectric methods. Two series of polyester-based polyurethane elastomers were prepared by varying the NCO/OH ratio during the se…
Abstract A PV was synthesized by polymerization of N , N ′‐bis( δ ‐aminopropyl)‐4,4′‐bipyridinium bromide hydrobromide (APD) and isophthaloyl chloride (ISP). The PV was completely soluble in water as well as in organic solvents. The spectroelectrochemical and EC properties of the resulting ionic self‐assembled multila…
For the first time, by the application of interference microscopy, direct monitoring of three-dimensional guest diffusion in nanoporous host-guest systems has become possible. The primary experimental evidence accessible using this technique is the integral over the concentration in the direction of observation. In th…
Abstract In the present work, the formation of ester linkages in cellulosic materials during drying and heating was addressed. The results indicated that direct ester formation, without anhydride intermediate, occurs between carboxylic acids of suitable structure and cellulosic hydroxyls at 180°C, even after reaction…
The heterobitopic ligands L(AB4) and L(AB5) have been designed and synthesised with the ultimate aim of self-assembling dual-function lanthanide complexes containing either a magnetic and a luminescent probe or two luminescent probes emitting at different wavelengths. They react with lanthanide ions to form complexes…
Novel phosphorescent conjugated oligo(phenylene-ethynylene)s featuring a central tunable platinum(II) Schiff base signalling unit with promising photophysical properties have been investigated to pave their development towards polymeric congeners for sensing applications.