Materials Literature
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We report a new method of low temperature removal of template from SBA-15 by KMnO4 chemical oxidation. Using this silica as template, mesoporous carbon with thick pore walls and relatively small mesopores can be cast. The results from XRD and nitrogen sorption show that the silica obtained after surfactant removal has…
Quantum chemistry and molecular dynamics were used to evaluate the performance of solid oxide fuel cell anode materials in the presence of and . The most common anode material Ni-yttria-stabilized zirconia (Ni-YSZ) was used for the study. It was found that the presence of has an important effect on the oxidation of .…
The reactivity of diatomic titanium with molecular nitrogen has been investigated in rare gas matrices. The formation of Ti2N2 from the condensation of effusive beams of Ti and N2 in neon and argon matrices is observed after sample deposition. Our results also show that the in situ formation results from the spontaneo…
The structure and properties of two aqueous polyurethane dispersions prepared by two different methods (acetone method and prepolymer mixing method) were compared. The aqueous polyurethane dispersion obtained by the acetone method (PU-AP) showed a narrower particle size distribution than that of the sample obtained by…
For practical consideration in applying mesoporous films for sensors, it is ideal to fabricate thinner films to achieve fast transport and therefore rapid response. Here we report a new, facile method to deposit mesoporous silica films with thickness less than 100 nm through combining convective self-assembly and surf…
A new material, Ga2Mo3O12, was prepared for the first time using non-hydrolytic sol–gel chemistry. Rietveld analysis of variable temperature X-ray diffraction data showed that this compound crystallizes in the monoclinic Sc2W3O12 structure, and that it displays positive thermal expansion up to its decomposition temper…
The directed assembly of binary blends of diblock copolymers on chemically nanopatterned substrates was investigated as a means to pattern features of controlled dimensions at the nanoscale. The lamella-forming blends assembled without defects and in registration with underlying chemical surface patterns that had peri…
In the present work, we have studied the possibility of using heterogeneous base catalysts, of various basic strengths, for performing the transesterification between oleic acid methyl ester (MeO) and various polyethyleneglycols of different molecular weights (PEG-600, -400 and -200) to obtain polyoxyethyleneglycol mo…
This paper studies the potential of 3 newly synthesized low molecular weight gelling agents (2 of them with azo groups) with the semicarbazide group as a H-bonding motif to gel the smectic phase of a commercial chiral smectic C material. To detect gelation two methods were used: the stabilization of the director patte…
In this paper, the synthesis of TiO2 films and simultaneous P ion-doping for them were attempted by the anodic oxidation of titanium in phosphoric acid solution under various conditions (several concentrations of phosphoric acid solution and applied voltages on the anodic oxidation etc). Products obtained by this anod…
A series of sandwich-shaped complexes based on two square tetranuclear Ag(I) metallomacrocycles, [[Ag4(pprd)4]2(XF6)]-(BF4)6.8MeNO2 (pprd = 4-(2-pyridyl)pyrimidine; X = Si, Ge and Sn), in which a XF6(2-) anion is encapsulated, were prepared and their structures were characterized both in the solid state and solution.
The electric double-layer capacitances at carbon electrodes with different surface morphologies have been determined in organic solution and polymeric gel electrolytes by an ac impedance method. The capacitance depended not only on the surface structure but also on the electrolyte composition. Activated carbon fiber w…
Surface-modified gold nanoparticles have pronounced benefits in the biomedical field due to their significant interaction with delivery materials. In the present study we used hydrophobically-modified polycations (i.e., N-acylated chitosan) to stabilize gold nanoparticles. Aliphatic hydrophobic groups, having carbon c…
The reaction kinetics of the chemical polymerization of aniline in aqueous acid solutions with FeCl3 as the oxidant (initiator) was investigated at 25?C. The polymerization was performed in a special reactor which enabled the initial concentration of oxidant to be kept constant during the polymerization reaction. The…
The anodic behavior of highly doped in aqueous was investigated. Electrodes anodized in the absence of light in 2– at a constant potential of 0.5– (SCE), or subjected to linear potential sweeps to potentials in this range, were shown to exhibit the formation of a nanoporous subsurface region. Both linear sweep voltamm…
Using the Bloch modes of a periodic, semi-infinite array of slits in a metallic host, we study the transmission of obliquely incident plane-waves through sub-wavelength slits. Matching the tangential E- and H-fields at the entrance facet of the periodic structure yields the complex amplitudes of the various Bloch mode…
This paper studied the thermal-induced phase separation (TIPS) phenomenon via spinodal decomposition (SD) in a polymer solution under a linear concentration gradient. The one-dimensional model consists of the Cahn–Hilliard theory for SD and incorporates the Flory–Huggins free energy equation, the slow mode mobility th…
Hybrid catalytic membrane systems have been produced by modifying porous ceramic membranes with metal oxide films. A two-layer cermet membrane consisting of a flexible stainless steel layer and an overlying porous TiO 2 ceramic layer and a ceramic titanium carbide membrane are examined. The membrane surfaces have been…
Scatterometry takes advantage of the sensitivity exhibited by optical diffraction from periodic structures, and hence is an efficient technique for lithographic process monitoring. A feature region measurement algorithm has been developed to extract accurately and quickly the relevant constitutive parameters from diff…
Two novel co-polymers based on omega-pentadecalactone were enzymatically synthesized by a combination of ring-opening polymerization and polycondensation. Modified literature procedures enabled the production of the semi-crystalline materials with suitable molecular weights and melting characteristics. Microspheres we…