Materials Literature
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The adsorption and desorption behavior of protein human serum albumin (HSA) on magnetic polymer particles covered by thermosensitive polymers was investigated. The results showed that adsorption was dependent mainly on the properties of the particle surface. By increasing the temperature, particles deswelled and were…
A surface silyl modification and surfactant removal of acid-synthesized mesoporous silica process in a single step is investigated; the surfactant–silyl exchange process allows a large amount of surface attachments of silane.
The crystal chemistry of the Sm3+ to Sm2+ reduction in tetraborate lattices was investigated. In crystalline SrB4O7 in air it is mainly Sm2+ that is incorporated from a melt or glass containing predominantly Sm3+. For the process in air, a reduction and pick-up mechanism is assumed to take place at the crystal/nutrien…
SrAl2O4 phosphor excited with fluorescent light or sunlight, has been recently reported to be a long-lasting afterglow (AG) phenomenon. However, the AG mechanism has not been clarified yet. In this study, the long-lasting AG mechanism of SrAl2O4 phosphors doped with Eu and/or Dy, was investigated on the basis of AG, p…
Changes in the elemental composition of the diatom Asterionella formosa within mixed phytoplankton samples were determined over the spring bloom period using energy dispersive X-ray microanalysis. Using a 10 kV electron microprobe, X-ray information from the top 1-2 µm of the cell revealed overall mean concentrations…
Various molar ratios of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and para-substituted meso-tetraphenylporphyrins (H2T(4-X)PP, X = H, Cl, CH3, CH(CH3)2, OCH3) in dichloromethane at room temperature in several days always afforded (DDQ)2H2T(4-X)PP molecular complexes as the sole products. The very close correspondence…
Poly(ethylene terephthalate)/copoly(succinic anhydride/ethylene oxide) copolymers, (PET/PES copolymers) were synthesized by the transreaction between PET and PES and characterized with GPC, 1H NMR, and DSC. Most of the copolymers obtained were random copolymers. The films cast of these copolymers were transparent. The…
Poly(ester urethane) (PU) with functional groups (amide, hydroxyl, carboxyl) on surfaces were prepared by grafting monomers such as acrylamide (AAm), hydroxyethyl acrylate (HEA), and methacrylic acid (MAA) onto the PU membranes. Grafting copolymerization was carried out by the combined use of photooxidization and UV i…
Cytocompatible polyurethane (PU) surface was prepared by photo-grafting 2-hydroxyethyl acrylate (HEA) onto the membrane surface. Graft polymerization was conducted by combining the use of the photo-oxidation and irradiation grafting. PU membrane was photo-oxidized to introduce the hydroperoxide groups onto the surface…
The adsorption of methane on Zn-exchanged zeolites was studied theoretically by density functional theory (DFT). Diverse types of active sites were employed, such as: a Zn(II) cation, which was placed on different rings (4T and 5T), a ZnO (in a tetramer configuration) cluster and a [Zn–O–Zn]2+ dimer complex. The Zn(II…
A series of copper containing mesoporous silicas has been prepared at room temperature using tetramethylorthosilicate as the source of silicon, a quaternary ammonium chloride salt as organic template surfactant and copper complexes obtained from organofunctional silicon molecules as ligands. Using this synthetic route…
Tetra- and octa(13, 17-dioxa nonacosane-15-sulfanyl) substituted metal free- and Ni(II) phthalocyanines have been synthesized from the corresponding phthalonitrile derivatives in the presence the anhydrous metal salt(NiCl2) or a strong organic base. The new compounds have been characterised by elemental analyses, IR,…
Nitrogen plasma treatments that modify polymer surfaces are often accompanied by uncontrollable oxidation phenomena. Air exposure of the treated samples after the plasma process may be the origin of the oxidation, but other oxygen contamination sources during the plasma treatment procedure cannot be eliminated. To cla…
The process of photoanodic etching of deep pores in lightly doped wafers was investigated. On a 6 in. wafer, more than 1 billion pores, regularly distributed over the wafer in a hexagonal array with a pitch of 3.5 μm, were obtained using an electrolytic back contact. The diameter of the pores was about 2 μm and depths…
We developed the ab initio linear combination of Gaussian type orbital program with a generalized Hartree–Fock–Slater (GHFS) functional and calculated the four hydrogen clusters as models of the noncollinear magnetic clusters. We found that the GHFS solutions with the three-dimensional noncollinear spin structure is t…
The photophysical characterisation of bis-porphyrins consisting of two porphyrins bridged by either a quinoxaline Tröger's base (1 and 2) or a biquinoxalinyl (3) spacer are reported. Efficient intramolecular electronic energy transfer (EET) between the rigidly linked free-base porphyrins in 1 and from the zinc(II) por…
Self-assembly of CdTe-nanoparticles and alkylammonium surfactants gives stable, hydrophobic surfactant-encapsulated CdTe-clusters that can be isolated as solid materials which dissolve in common organic solvents, spread at the air–water interface, and show enhanced photochemical stability.
Radiation crosslinking of polymer blends containing the ethylene–propylene terpolymer (EPDM) and polypropylene (PP) was studied. Four binary systems with mixing ratios of 80/20, 60/40, 40/60, and 20/80 w/w and the individual components were γ-processed. The development of the gel content formed in irradiated blends pr…
Poly(o-phenylenediamine) films were electrochemically prepared on gold electrodes from the corresponding monomer in an aqueous solution at a constant potential. The polymeric films prepared in this one-step procedure were found to be thin and insoluble in the aqueous solution. Cyclic and differential pulse voltammetri…
The doubly doped (Bi3+ and Eu3+) GdVO4 powder is synthesized by the combustion of aqueous solutions containing metal nitrate (GdNO3), ammonium nitrate (NH4NO3), ammonium metavanadate (NH4VO3) and 3-methyl-5-pyrazole-5-one (3MP5O). The powders are mixed thoroughly by mechanical crushing for 1 h. The aqueous solution co…