Materials Literature
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In this study, the bio-reduction of Au(III) to Au(0) by wheat biomass and the subsequent production of gold nanoparticles of various shapes and sizes is presented. The dry biomass was ground and sieved in order to assure a uniform particle size and having more area of biomass exposed to the gold. Wheat biomass was exp…
Abstract A microtexture analysis by TEM and AFM of palygorskite deposits from the Hawthorne Formation, southern Georgia is given. Palygorskite is the dominant mineral comprising an average of 65–70% of the sample volume with smaller volumes of smectite, illite and kaolinite. Morphologic observations indicate that the…
The thermoelectric properties of layer-structured homologous compounds of (ZnO) m In 2 O 3 ( m is an integer) were investigated in terms of the detailed dependence of the molar ratio of ZnO to In 2 O 3 , n (=ZnO/In 2 O 3 ), and of doping, such as with Ba 2+ , Ca 2+ , Sr 2+ , and Sn 4+ , for an In site. Except for the…
Methyl methacrylate (MMA) emulsion polymerization in the presence of nanometer calcium carbonate(nano-CaCO3) surface modified with γ-methacryloxypropyltrimethoxysilane (MPTMS) was carried out to prepare poly (methyl methacrylate) (PMMA)/nano-CaCO3 composite. The reaction between nano-CaCO3 and MPTMS, and the grafting…
Abstract The structure and dynamics of the surfactant layer in organoclays prepared from synthetic clays (Laponites, expandable fluoromica) and in their composites with polystyrene are studied in order to understand the influence of the interface layer on composite properties and composite formation from melt or solut…
Earlier works showed that the use of electron beam melting is a viable process to produce NiTi shape memory alloy. In those works a static and a semi-dynamic processes were used producing small shell-shaped and cylindrical ingots respectively. The main characteristics of those samples were low carbon concentration and…
This paper is devoted to the evaluation of the corrosion behavior of Alloy 800 (UNS N08800) when exposed to 80 mol% Na2SO4-20V2O5 (80 mol% sodium sulfate-20vanadium pentoxide; high sulfate) and 80 mol% V2O5-20Na2SO4 (high vanadate) at 700°C and 900°C. Applying electrochemical techniques, namely potentiodynamic polariz…
We cloned and expressed in Escherichia coli the Archaeglobus fulgidus gene that encodes pyruvate formate lyase 2 (PFL2). PFL2, despite its homology to the other glycyl radical enzymes, differs from them by exhibiting a completely different oligomerization. The most abundant form of PFL2 when expressed in E.coli is a t…
Abstract Ultrafine ferrite grains in a plain C–Mn steel (0.3 mass% C) were produced by large-strain warm compression and subsequent annealing treatment in a temperature range between 773 K and 1003 K. The samples were investigated by means of high-resolution electron back-scatter diffraction. The resulting microstruct…
We report experiments on the aging of monodisperse wet microfoams. We use the flow focusing technique to produce perfectly monodisperse microbubbles from 50 to 80 μm in diameter. This results in a foam of spherical bubbles of the same size ordered in random ordered lattices like “crystal grains” above the foam/liquid…
The functional properties of foods can be preserved when they are coated with edible films, since both the loss of moisture and the transport of O2 and CO2 are reduced. The objectives of this work were: to compare weight loss, Haugh units, and albumen pH between fresh eggs and eggs coated with whey protein concentrate…
This work studied the influence of calcination conditions on basic properties and catalytic performance of Mg,Al-mixed oxides derived from a hydrotalcite sample (Al/(Al+Mg)=0.20). Various heating rates, calcination atmospheres and lengths of calcination at 723K were evaluated. TPD of CO2 and retroaldolization of diace…
Photoluminescence and photoreflectance measurements have been used to determine excitonic transitions in the ternary Al xGa1-xAs alloy in the temperature range from 2 to 300 K. The effect of the thermal expansion contribution on the temperature dependence of excitonic transitions for different aluminum concentrations…
Control of the cell surface allows modulation of the cell's biological response, producing practical applications and satisfying scientific interests. Consequently, to meet such goals and interests, diverse approaches were developed in cell surface engineering techniques. Poly(ethylene glycol) (PEG) intermediates were…
Large changes in hysteresis are reported as a function of applied stress under thermal cycling experiments in NiTi single crystals. In the low Ni alloy the thermal hysteresis expanded with increasing stress while in the high Ni alloy the thermal hysteresis contracted with increasing stress. The results in both cases m…
Abstract Summary: This work reviews the use of the imaging of radicals interacting with surfaces (IRIS) technique to elucidate chemical mechanisms during plasma modification of polymers. Four systems are examined, NH and NH 2 in NH 3 plasmas, OH radicals in H 2 O and O 2 /NH 3 plasmas, OH in SiO 2 film deposition syst…
Two electrostatic models have been developed that allow calculation of the critical concentration of hydrogen-like impurities in three-dimensional crystalline semiconductors corresponding to the insulator-metal and metal-insulator transition in the zero temperature limit. The insulator-metal transition manifests itsel…
Resonant subwavelength gratings (RSGs) offer narrowband high reflectivity with low-reflectivity sidebands. Analysis with the commonly used rigorous coupled-wave analysis assumes an RSG with infinite lateral extent and illumination by plane waves. This analysis is performed with a finite-difference semivectorial high-o…
The variation in physical, optical and electrical properties has been investigated as a function of Bi2O3 content in 20CaO · xBi2O3 · (80 − x)B2O3 (0 ≤ x ≤ 60, in mol%) glasses. The samples were prepared by normal melt-quenching process, and the optical absorption and reflection spectra were recorded in the wavelength…
The optical properties of two-dimensional photonic crystals (PhCs) in anodic aluminum oxide (AAO) films obtained using a simple and low-cost pre-patterning procedure are described. The prepatterning of the initial Al film surface was carried out by imprinting with an optical diffraction grating; the anodization of the…