Materials Literature
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The electrochemical properties of porphyrin-appended dendrimers containing 2-, 4-, 8-, 16-, 32- and 64-porphyrin macrocycles in their free-base and zinc(II) forms have been investigated. Both series gave diffusional based voltammetric responses in dichloromethane. There was minimal effect of dendrimer generation on th…
A new type of coating involving a layer-by-layer technique has been recently reported. This coating is composed of a polyelectrolyte multilayer film that confers specific properties on surfaces to which it is applied. Here, we studied the applicability of such a technique to the coating of oral prostheses, by first te…
A series of biodegradable poly (ester amide)s composed of sebacic acid, dodecanediol and different ratios of the stereoisomers of L- and D-alanine were synthesized for applications in drug delivery systems. Microspheres loaded with diclofenac sodium salt, triclosan and clofazimine were prepared with the solvent evapor…
Abstract For certain commercial applications of polypyrrole (PPy), an enhancement of the electrical conductivity of the material is the key to industrial success. In this paper it will be shown that raw PPy with high conductivity (>150 S/cm) can be obtained in very good yield (>90%) by appropriate selection of b…
The synthesis of three-dimensional (Pm3n) cubic phenylene-bridged hybrid mesoporous silica material using a novel allylorganosilane precursor 1,4-bis(triallylsilyl)phenylene and cetyltrimethylammoniumchloride (C16TMACl) as a structure-directing agent in acidic medium is presented. Sulfonic acid functionalized derivati…
This paper describes a new energy model of yarn bending. The fibre bending and torsion energy terms are considered. The fibre helices could be naturally curved. Fibre helices in a bent yarn are generated by a rotating vector. The singularity of torsion along a bent fibre helix is discussed. By allowing the rotation sp…
Gallium zinc oxynitride (Ga0.93Zn0.07)(N0.90O0.10) is a new type of photocatalyst that is capable of overall water splitting under visible light. The crystal structure of the (Ga0.93Zn0.07)(N0.90O0.10) was refined by Rietveld analyses of neutron powder diffraction data. The (Ga0.93Zn0.07)(N0.90O0.10) was confirmed to…
Reconstructive surgery using autologous vessels is the conventional approach for substitution of diseased vessels or for generation of bypass to improve blood supply downstream of stenosed vessels. In some circumstances the use of autologous material is not possible due to concomitant diseases or previous use, and art…
The reactions of methyl(2-pyridyl)ketone oxime, (py)C(Me)NOH, with zinc chloride have been investigated. An excess of the ligand in EtOH/MeCN affords the mononuclear complex [ZnCl 2 {(py)C(Me)NOH} 2 ] (1) in moderate yield. The metal ion is coordinated by two chloro ligands and two N,N′- chelating (py)C(Me)NOH molecul…
Dense SiC ceramics fabricated by NITE process (NITE-SiC), using SiC nano-powder, were subjected to exposure tests from 1000 to 1800°C in an argon-oxygen gas mixture with an oxygen partial pressure of 0.1 Pa. The thermal stability of NITE-SiC was examined through mass change, 3-point bending test, XRD analysis and TEM/…
The perovskite-related intergrowth oxides, Sr 3 − x La x Fe 2 − y Co y O 7 − δ ( 0.3 ⩽ x ⩽ 0.6 and 0 ⩽ y ⩽ 0.6 ), have been investigated as cathode materials for intermediate temperature solid oxide fuel cells. With a given La content x , the electrical conductivity, oxide-ion vacancy concentration, and thermal expans…
Hierarchically porous inorganic nanocomposites have been synthesized combining interconnected macropores and mesopores with a high loading of site-isolated gold nanoparticles.
We established a method to clean the Si surface that exists at the bottom of anodic aluminum oxide (AAO) nanoholes after removal of the amorphous barrier layer, and we succeeded in the preparation of epitaxial Cu dot arrays on the Si surface in the nanoholes. The Si surfaces at the AAO nanohole bottoms were cleaned wi…
Using a [Ru(II)([9]aneS3)] templating moiety, kinetically-locked, metallomacrocycles incorporating adenine based ligands have been synthesised through self-assembly. The kinetically robust nature of these structures is confirmed by electrochemical studies: each can be reversibly oxidised in a four-member redox series,…
Two new C(21) steroidal glycosides, tenacissoside L (1), tenacissoside M (2), were isolated from the stems of Marsdenia tenacissima (ROXB.) WIGHT et ARN. Their structures were elucidated, respectively, by means of chemical and spectral data, including ESI-MS, HR-ESI-MS, 1D-NMR and 2D-NMR.
In a recent X–ray absorption study in boron doped diamond, Nakamura et al. have seen a wellisolated narrow boron impurity band in non-superconducting samples and an additional narrow band at the chemical potential in a superconducting sample. We interpret the beautiful spectra as evidence forupper Hubbard band of a Mo…
Nanotechnology, building on its ability to control or manipulate structures at the atomic level, promises to develop effective drug-delivery systems. This is to be achieved through creating structures that have novel properties because of their small size. This is not an entirely new concept in site-targeted drug deli…
The research on electromagnetic (EM) shielding has been advanced for various applications. Recently, researchers have been interested in nano-sized particles to modify electromagnetic properties of a base material. In this research, glass fiber–epoxy–nanoparticle composites (GFR nanocomposites) are fabricated using fo…
Surface plasmon-like (SPL) modes are the electromagnetic surface eigenmodes supported by the structured perfectly conducting surfaces. The standard eigenvalue-solving method is adopted to solve these SPL modes. The field patterns of the SPL modes in the square holes for in-plane wavevectors k(x) = 2pi / 2d and k(x) =…
A three-dimensional structure formation simulator of colloidal nanoparticles during drying is developed. Motion of the nanoparticles is modeled by Langevin equation, in which forces exerted on each nanoparticle consist of contact force, capillary force, Brownian force, van der Waals force, electrostatic force and flui…