Materials Literature
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The synthesis and characterisation of a homologous series of liquid crystal trimers, the 4,4′-bis[ω-(4-cyanobiphenyl-4′-yloxy)alkoxy]biphenyls, is reported in which the length of the flexible spacers is varied from 3 to 12 methylene units. All the members of the series exhibit enantiotropic nematic behaviour and, in a…
PTFE (polytetrafluoroethylene) membrane filters were tested for preparing corn oil emulsions by the membrane emulsification method using a pre-emulsified emulsion. A hydrophilic PTFE membrane was used to prepare an O/W emulsion without any disturbance of the continuous phase. A W/O emulsion was prepared with a hydroph…
I. STRUCTURES AND PROPERTIES. 1. Atomic Structure and Bonding in Solids. 2. Crystalline Structures - Ideal and Actual. 3. Electrical Properties of Materials. 4. Materials Properties for Design of Structures and Components. II. PROCESSING. 5. Equilibrium Phase Diagrams. 6. Diffusion in Solids. 7. Melting, Solidificatio…
The structure, dynamics, and strength of aqueous boehmite gels were studied by yield stress measurements and light scattering as a function of the particle aspect ratio and ionic strength. The yield stress was found to be a strongly varying function of the salt concentration. At low ionic strength, yield stress result…
The crystal structure of the non-stoichiometric Na x Si 136 silicon clathrate has been refined using the Rietveld method, in order to determine accurately the distribution of the sodium atoms within the two available sites. In agreement with the previous data, it was found that for x≤8, the alkali atoms occupy exclusi…
A dioxoruthenium(VI) complex with a D4-chiral porphyrin ligand has been prepared and characterized by spectroscopic methods and X-ray crystal analysis; the complex exhibits catalytic activity towards aerobic enantioselective epoxidation of prochiral alkenes with enantioselectivity up to 73% ee at an oxygen pressure of…
This paper analyzes the strengxth and failure behavior of plain weave composites. First, the geometrical characteristics of yarn shape, laminate stacking configuration, fiber volume fraction, and yarn packing fraction are investigated using three-dimensional geometrical models. Based on the geometrical characteristics…
Several possibilities are presented to deal with nonlinearity in ferromagnetic media in the case of time harmonic excitation in steady state, without losing simplicity in describing the potentials by means of complex peak values. The main idea is to introduce a fictitious time independent and inhomogeneous material to…
The efficiency of the H2O2 oxidation of 2,4,6-trichlorophenol (TCP) catalyzed by iron tetrasulfophthalocyanine (FePcS) is highly dependent on the pH value of the reaction mixture, the local hydrogen peroxide concentration and the organization of FePcS molecules in solution. Among the several forms of FePcS in aqueous…
The properties of complexes of five spiropyran-derived merocyanines with MgII, PbII, transition and rare-earth metal ions (Mn+, n = 2, 3) have been studied in acetone by steady-state and time-resolved techniques. Within nanoseconds, excitation of the spiropyran (Sp) form of 1′,3′,3′-trimethyl-6-nitro-8-methoxy-spiro[2…
The heat capacity of poly-p-dioxanone (PPDX), (CH2‒CH2‒O‒CH2‒COO‒)x, was determined using both differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC) from 200 K to 430 K. Based on the new data and literature data, the heat capacity of the solid state was analyzed using an approximate group vibra…
We discuss the method for measuring surface charge density accumulated on the surface of a solid dielectric (insulating specimen) such as a supporting spacer in gas and vacuum insulated equipment. For such thick specimens, the probe response does not correspond to the charge density directly below the probe, so the me…
This paper presents a review of the theories based on wetting measurements/interfacial thermodynamics most frequently used to explain bacterial adhesion to solid surfaces. The physical meaning of data stemming from the application of the different theories is discussed and compared with current knowledge on interactio…
Local spin-density calculations are used to investigate the relationship between lattice distortions, magnetic ordering, and electronic properties in manganite perovskites. Lattice distortions are found to open pseudogaps at the middle of the majority spin ${e}_{g}$ manifold, which are more directly related to rotatio…
Calmodulin (CaM) is a primary Ca2+-binding protein found in all eukaryotic cells. It couples the intracellular Ca2+ signal to many essential cellular events by binding and regulating the activities of more than 40 different proteins and enzymes in a Ca2+-dependent manner. CaM contains two structurally similar domains…
Mesoporous aluminosilicate molecular sieves with the MCM-48 structure and atomic Si/Al ratios of 15−40 have been synthesized using aluminum chloride hexahydrate and aluminum sulfate as the sources of aluminum. The products were characterized by powder X-ray diffraction (XRD), thermal analysis (TG/DTA), diffuse reflect…
Transmission Fourier transform infrared spectroscopy has been used to identify gas-phase and surface-bound products and intermediates formed during the gas-phase photooxidation of trichloroethylene (TCE) on TiO 2 and ZnO. Several factors are found to influence the gas-phase product distribution for this reaction. On c…
Charge-transfer salts between BDNT and M(mnt)2 (M=Ni, Pd, Pt, and Au) have been prepared by mixing BDNT–(SbCl6)2 and (TBA)2 –[M(mnt)2 ] and by electrochemical oxidation of BDNT in TBA–[M(mnt)2 ] solution. Almost all powdery samples of (1:1) salts show high electrical conductivity. The valence of M(mnt)2 was determined…
A comparative study of Cu/Al 2 O 3 (CuA) and Cu/CeO 2 /Al 2 O 3 (CuCA) catalysts, examining the redox processes induced by thermal treatments in CO on preoxidized samples, has been performed by means of temperature-programmed techniques (TPR, TPO, and TPD) and FTIR and EPR spectroscopies. The results evidence differen…
Two kinds of twinning morphologies of ZnO crystallites prepared under hydrothermal conditions were obtained. The twin relations of the crystallites could be influenced by additives. The twinned crystallites in the pure H2O or weak basic solutions (1 N KOH) are bipyramidal and take (0001-) as the twin and composition p…