Materials Literature
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Silk fabrics were treated with O2, N2, and H2 plasmas for deep dyeing and good color fastness to rubbing. C.I. (Color Index) Reactive Black 5 was used as a dye, and color deepness was evaluated by total K/S. All plasma-treated silk fabrics showed weight loss, especially by O2 plasma. Total K/S of dyed silk fabrics tre…
Protein adsorption on polymer particles has significant importance in biomedical applications, both in vitro and in vivo. It has, therefore, been studied from all viewpoints for the last two decades, but the results were inconsistent
The corrosion behavior of Al 2024-T3 and C26000 brass exposed to artificial seawater and Luria Bertani medium has been studied using electrochemical impedance spectroscopy. Tests were performed in sterile media and in the presence of three strains of bacteria. A Bacillus subtilis biofilm was genetically engineered to…
Injecting aqueous solutions of hydrogen peroxide (H2O2) into hot flue gases can convert nitric oxide (NO) to higher oxidation states (NO2,HNO2, and HNO3), which can then be removed in a wet scrubber. The optimum temperature for such conversion is 500°C (930°F), at which H2O2 is thermally “activated” (split into free r…
The dynamic pattern formation and the beam-steering characteristics of cholesteric gratings were studied. Films with a planar cholesteric texture and various thickness to pitch length ratios ( d / p ) were fabricated. An optical microscope was used to observe the stripe patterns of the cholesteric gratings formed by a…
Reaction of the mononuclear ‘complex ligands’ [Re(CO)3Cl(L)] [L = 2,2′-bipyrimidine (bpym) or 2,3-bis(2-pyridyl)pyrazine (bppz)] with a Ln(β-diketonate)3 unit affords the heterodinuclear complexes [Re(CO)3Cl(μ-bpym)Ln(fod)3] and [Re(CO)3Cl(μ-bppz)Ln(tta)3]; one member of each series has been structurally characterised.
The experimental determination by means of DSC together with a thermodynamic analysis of the two-component phase diagram of octylcyanobiphenyl (8CB)+ octyloxycyanobiphenyl (8OCB) has been performed. The thermodynamic consistency of the two-component system has been proved and similar excess Gibbs energies for mixtures…
Experimental investigations of the transport phenomena (electric conduction; Seebeck, Hall, and Nernst-Ettingshausen effects) in PbTe and Pb 1− x Sn x Te solid solutions with high content of In impurity (up to 20 at. %) at temperatures of up to 400 K are reviewed. Many properties of these substances are similar to tho…
In the last decade the sol‐gel process became a promising method to synthesize materials in form of coatings, nanoscale powders and porous systems. Several products or devices made with such a process already exist on the market. This paper briefly reviews the state of the art in the development of electrochromic coat…
The steady-state and impedance response of a solid metal point electrode in contact with a solid, oxygen-ion conducting electrolyte in atmospheres was derived for three reaction mechanisms, involving gaseous species or species adsorbed on the surface of the electrode and/or the electrolyte. The overall electrochemical…
A new potassium titanate, KTiO 2 (OH), synthesized by hydrothermal oxidation of Ti metal powder in KOH solution was characterized. The X-ray photospectroscopy revealed that titanium contained in this compound consists of only Ti 4+, and FT-IR spectrum supported the existence of hydroxyl group in the structure. It was…
The radical ClCNSSN (1) exhibits a rigid geometry which limits structural variation in the solid state to differences in packing motifs. Sublimation of 1 (75 °C, 10−2 Torr) leads to the isolation of three distinct polymorphs; 1α (monoclinic, P21/n) crystallises as cisoid dimers with two molecules in the asymmetric uni…
A two‐step sintering process is described in which the first step suppresses densification while allowing the α‐to‐β phase transformation to proceed, and the second step, at higher temperatures, promotes densification and grain growth. This process allows one to obtain a bimodal microstructure in Si 3 N 4 without usin…
Intramolecular energy transfer from platinum–acetylide moieties to the porphyrin core was observed in novel organometallic dendrimers that were prepared from a tetra(4-ethynylphenyl)porphyrin-bridged tetranuclear platinum–acetylide core and platinum–acetylide dendrons by a convergent method.
Reaction of 3-(propyltrimethoxysilyl)acetylacetone with Ti(OiPr)4 results in new single-source precursors for dispersed silica–titania mixed-metal oxides with low titania crystallization tendencies.
Gelatin microspheres and gelatin sponges were prepared by coacervation and freeze drying techniques, respectively. Both systems were crosslinked with glutaraldehyde. The mean diameter of the microspheres were in the range of 40-80 microm and the mean pore size of the sponges was 130-220 microm depending on the prepara…
The strategy of producing crystals of uni-modal size distribution was investigated for dilution (or anti-solvent) crystallization. Sodium chloride was crystallized as a model compound from aqueous solution by adding pure ethanol (99 vol.% ethanol) or an ethanol-water (75 vol.% ethanol) mixture as diluent. The effects…
The relaxor ferroelectric, Sodium Bismuth Titanate, (Na 0.5 Bi 0.5 TiO 3 ), NBT is an A-site substituted distorted perovskite. An extensive temperature-, pressure- and substitution-dependent study of the crystal structure and phase transitions in this compound has been carried out using neutron/x-ray diffraction techn…
High‐strength porous alumina has been fabricated with a microstructure control using the pulse electric current sintering (PECS) technique. During sintering the discharge, which is assumed to take place in the voids between the particles, is thought to promote the bridging of particles by neck growth in the initial st…
Potential-dependent Fourier transform infrared emission spectroscopy (pd-FTIRES) has been used for the first time to study, in situ , oxygen reduction under practical operating conditions of intermediate-temperature solid oxide fuel cells. Surface emission difference spectra of functioning cathodes at 550°C under a va…