Materials Literature
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Ba deposition on a theta-Al(2)O(3)/NiAl(100) substrate and its oxidation with gas-phase O(2) at various surface temperatures are investigated using X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and temperature programmed desorption (TPD) techniques. Oxidation of metallic Ba by gas-phase O(…
A simple method is described for the electrostatic assembly of CdS nanoparticles onto oxidized aligned multiwalled carbon nanotubes (MWCNTs) in aqueous solution. The method is convenient to control and allows the formation of a stable, water-soluble suspension of CdS/aligned-MWCNT heterostructures. The prepared CdS/al…
Abstract Mass spectrometry has played a significant role in dendrimer chemistry, because it serves as an excellent analytical means to determine the purity and analyze the nature of defects even for higher generations. However, a mass spectrometer can also be used as a laboratory to study isolated dendrimer molecules…
The phase transformations occurring in amorphous europium molybdate Eu 2 (MoO 4 ) 3 during annealing at atmospheric pressure are studied using optical spectroscopy and x-ray diffractometry. It is established that the metastable β phase is formed at a temperature of ∼550°C, whereas the transition to the stable equilibr…
Abstract Boiling glauconite from the El-Gideda area of Egypt in different concentrations of HCl and H 2 SO 4 for different periods led to a modified structure. Treatment resulted in progressive destruction of the structure, leaving X-ray amorphous silica and only relics of the original mineral. The glauconitic materia…
The automotive coating processes contribute significantly to the environmental burden compared to other stages of vehicle manufacturing. Efforts are being made to reduce this impact through legislation, resulting in the introduction of new coating formulations and application technologies. Water‐borne, powder and UV‐c…
Schiff base oligomer of 2-[(4-morpholin-4-yl-phenyl)imino]methylphenol (2-MPIMP) was synthesized via oxidative polycondensation reaction by using air O2 and NaOCl oxidants in an alkaline medium between 40 and 90 °C. The structure of oligo-2-[(4-morpholin-4-yl-phenyl)imino]methylphenol (O-2-MPIMP) was characterized by…
The aim of the present study was to investigate the detailed evolution of the SAz-1 smectite in 1 M KOH at 80 °C at a solid/liquid ratio of 1/80. AFM observations indicated no change in crystal size or shape. XRD measurements at 40% relative humidity revealed changes in expandability of the smectite. The (001) reflect…
Rutherford Scattering Nuclear Phenomenology Nuclear Models Nuclear Radiation Applications of Nuclear Physics Energy Deposition in Media Particle Detection Accelerators Properties and Interactions of Elementary Particles Symmetries Discrete Transformations Neutral Kaons and CP Violation The Standard Model Beyond the St…
A systematic chemical and structural investigation of arrojadite-group minerals has provided new data allowing us to design a consistent nomenclature scheme, approved by the IMA CNMMN (vote 05-D). The cornerstones of this scheme are: (1) the fundamental structural formula for the arrojadite group is A 2 B 2 Ca Na 2+x…
The relationship between the processes of the nanostructure evolution and the strain-induced dissolution of phases upon severe plastic deformation is studied. The known mechanisms of these phenomena are analyzed, and new ones are proposed. The extended metastable and equilibrium phase diagram used for the analysis of…
Investigation of scandium incorporation in garnets along the synthetic Ca 3 Fe 2 3+ Si 3 O 12 -Ca 3 Sc 2 Si 3 O 12 (adr.CaSc) join, based on the same multi-technique approach used in the companion paper (Oberti et al. 2006a), shows that (1) Sc is incorporated exclusively at the Y octahedron; (2) the local coordination…
The design and performance of an x-ray photoelectron spectroscopy (XPS)–scanning tunneling microscopy (STM) surface analysis system for studying nanostructured materials are described. The analysis system features electron spectroscopy methods (XPS and Auger electron spectroscopy) in addition to a variable temperature…
An emerging group of hybrid materials is the so-called bio-nanocomposites, which are bio-hybrid nanostructured materials based on the combination of natural polymers (polysaccharides, proteins, enzymes, nucleic acids) and inorganic solids (clays, double layered hydroxides, phosphates, metal oxides, etc.). Bio-nanocomp…
Stacking structure in disordered talc, Mg 3 Si 4 O 10 (OH) 2 , has been investigated by using highresolution transmission electron microscopy (HRTEM) and by comparison between experimental and simulated powder X-ray diffraction (XRD) patterns. The talc specimen investigated was massive aggregates of fine platy crystal…
Dielectric flashover along insulators in vacuum has been comprehensively researched in the past. Less studied, but of similar importance, is surface flashover at atmospheric pressures and the impact of an atypical electrode geometry, humidity, and ultraviolet (UV) illumination. Previous research has shown distinct dis…
A study of the reforming rates, heat transfer and flow through a methanol reforming catalytic microreactor fabricated on a silicon wafer are presented. Packed bed microchannel reactors were fabricated using silicon DRIE, followed by wafer bonding. The reactor bed was subsequently filled with catalyst particles. Therma…
This paper shows the effect of electrode area on dielectric strength for different polymeric materials. In the investigation, four electrodes of different diameters are selected in the range of 12.5-50 mm. To develop a base of understanding, several commercially available dielectric materials of different thickness th…
Naïve mode coupling theory is applied to particles interacting with short-range Yukawa attractions. Model results for the location of the gel line and the modulus of the resulting gels are reduced to algebraic equations capturing the effects of the range and strength of attraction. This model is then applied to thermo…
We report the observation of reversible electroresistance in a metallic film La0.67Sr0.33MnO3 (LSMO). The transport behavior of the Ag/LSMO system is found to be sensitive to external electric field, and a switching of the resistance between two definite resistive states can be induced by electric pulses of different…