Methylphenidate drug test (MPD) (strip)

Chin-brick tea polysaccharide conjugates (TPC-C) were prepared to study their emulsion capabilities. Interfacial tension and the effects of some factors, such as storage time, metal ion concentrations (Na+, Ca2+), pH (2.0-8.0), and heat treatment (70-100 degrees C) on the emulsions stabilized by TPC-C were studied. The interfacial tension of TPC-C (10.88 mN/m) was lower than that of gum arabic (15.18 mN/m) at a concentration of 0.08%. As the TPC-C concentration increased from 0.1 to 3.0 wt %, the mean particle diameter (MPD) (d(32)) of emulsions stabilized by TPC-C decreased from 1.88 to 0.16 mu m. Furthermore, at a concentration of 0.5 wt % or higher, the MPD (d(32)) of emulsions stabilized by TPC-C at 25 and 60 degrees C for 10 days was between 0.20 and 0.50 mu m. In the tested pH conditions from 2.0 to 8.0, the MPD (d(32)) of emulsions stabilized by 2.0 wt % TPC-C was less than 0.20 mu m. At Na+ concentration conditions between 0.10 and 0.50 mol/L, the MPD (d(32)) of emulsions was between 0.19 and 0.20 mu m, and the zeta potential values varied from -34.10 to -32.60 mV. However, with an increasing Ca2+ concentration from 0.01 to 0.05 mol/L, the MPD (d(32)) of emulsions was between 0.20 and 21.65 mu m, and the zeta potential raised sharply from -34.10 to -28.46 mV. The emulsions stabilized by TPC-C have a decent storage stability after a high-temperature heat treatment. Overall, tea polysaccharide conjugates strongly stabilized the emulsions, which support their new application as natural emulsifiers.

In order to optimize the performance of La2NiO4+delta materials as H-SOFC cathodes, different Ca doping amounts (x = 0, 0.25, 0.5, 0.75) is adopted to find the best solution. Doping with Ca in La2NiO4+delta can effectively improve the electrical conductivity and the ORR activity of the cathode surface, which have good chemical stability and compatible TEC with the electrolyte. Electrochemical studies reveal that La1.5Ca0.5NiO4+delta cathode shows the best electrochemical performance in single cell tests outputing the maximum power density (MPD) of 923 mW cm(-2) and the polarization resistance (R-p) of 0.053 Omega cm(2) at 700 degrees C. This work indicates that the single-phase R-P layered material La1.5Ca0.5NiO4+delta could be a promising cathode for H-SOFC. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.