For example, the interface conduction remains unaffected when the capping alumina film is etched away by a 4-M aqueous NaOH solution. This strongly suggests that the effective charge carriers are mainly located on the STO side. Discussion As each layer of the (001)-oriented g-Al2O3/STO ...
Effect of surface acid properties of HNO3 and NaOH modified VO_x/Al2O3 catalysts on methanol selective oxidation was studied by solid-state nuclear magnetic resonance and X-ray powder diffraction (XRD) spectroscopy. The surface acidity including type and strength of the acid sites in the ...
A wide range of Na2SiO3 (2–36 g·L−1) and KOH or NaOH (2–8 g·L−1) concentrations were used in the electrolytic solution for PEO of Al alloy [7,11,12,13,14,15,16]. Cheng et al. [7] prepared PEO coating in dilute (8 g L−1 Na2SiO3. 9H2O) and concentrated (36 ...
Ceramic cutting inserts coated with ten-fold alternating micro- and nanocrystalline diamond (MCD/NCD) layers grown by hot filament chemical vapor deposition (CVD) were tested in the machining of an Al based metallic matrix composite (MMC) containing 15 v
Prior to this, it was appropriately salted in NaOH solution to eliminate residue and oil. A known amount of AA6061 alloy billets was dissolved in a crucible in an electrical resistance heater to a required temperature range of 660–670 °C and subsequently superheated. In order to acquire ...
For asymmetric etching, one compartment is filled with a 60:40 mixture of 9 mol/L NaOH and CH3OH as etchant, while the other cell compartment contains deionized H2O (Millipore Direct-QTMS, Merck, Darmstadt, Germany) as a stopping solution. The cell is thermostated at a temperature of 30...
DCH can be avoided by blocking the most active sites with NaOH [40] or deposited coke from the reaction [41], and the Schiff base formation is inhibited by the presence of ammonia or group IA hydroxides [42,43]. Of course, the addition of alkali metal may play a negative effect on ...
For the adsorption kinetic studies, four spheres were used in 100 mL of 200 mg/L Cd+2 solution, keeping the pH constant at 5 by adding 0.1 M NaOH or HNO3 at room temperature. The equilibrium data obtained from the adsorption experiments were fitted on Pseudo first order (1), Pseudo ...
First, aluminum isopropoxide (≥98%, Merck) was dissolved in tetrapropylammonium hydroxide (TPAOH, 1 M in water, Merck) under continuous stirring to obtain a clear solution, and this was followed by addition of H2O, then NaOH (≥98%, Merck), and finally tetraethyl orthosilicate (TEOS, ≥...
On the other hand, the basic catalysts usually used in the biodiesel industry (KOH, NaOH, and potassium and sodium methoxides) have important drawbacks [4]. Although they could be replaced by heterogeneous solid catalysts to make their re-utilization possible, some issues concerning those ...