The solubility of sodium chromate tetrahydrate has been investigated in the temperature range from 290.15 K to 325.15 K using the conventional polythermal method by means of the laser technique. The metastable zone width (MZW) and the apparent nucleation order of sodium chromate tetrahydrate were calculated. The effects of cooling rate, initial composition, stirring rate, and seed particles on the MZW were also studied. The results show that the MZW of sodium chromate tetrahydrate first increases and then narrows with increasing initial composition. The MZW becomes wider by reducing the cooling rate and the mass of seed particles, whereas the MZW will be reduced by enhancing the rotation frequency of stirring and the diameter of seed particles.
Single phase CuO films have been successfully synthesized by thermal oxidation of cupper foil in air with water vapor. The structural and optical properties of CuO films were investigated. It is observed that the grain size increases with increasing the oxidation temperature. The optical band gap of CuO film is determined by the transmittance and reflectance spectra.
This experiment selected Taiwan lily as experimental material to study the different ages of lily to produce different explants to induce differentiation, through subculture and the optimal conditions for tissue culture outdoor refining, and then the experimental staff established Systematic Taiwan lily flower tissue culture and rapid propagation technology. Studies have shown that the optimal medium for differentiation of Taiwan lily flower scales (winter sampling) is MS+0.2 ug/L GA3+0.1 mg/L NAA+1 mg/L 6-BA; optimal Taiwan lily leaves (winter sampling) The medium for differentiation was MS + 0.1 ug / L GA3 + 0.1 mg / L NAA + 1 mg / L KT. The best scale-induced differentiation medium for Taiwan lily (spring sampling) that was not in dormancy was MS+0.1 mg/L NAA+1.0 mg/L 6-BA, and the leaf differentiation medium was MS+0.1 mg/L NAA+ 1 mg/L IBA. MS+0.2 mg/L NAA+1.0 mg/L KT was the best callus differentiation bulb culture medium, MS+0.5 mg/L NAA+0.5 mg/L 6-BA was the best induction rooting medium.
V2O5·nH2O nanosheets are fabricated hydrothermally with the acidified peroxovanadate solution at 200 °C for 12 h. The X-ray diffraction suggests that V2O5·nH2O nanosheets display lamellar ordering along c-axis direction. Transmission electron microscopy, field-emission scanning electron microscopy, and selected area electron diffraction indicate that V2O5·nH2O nanosheets are very thin in thickness and micron-sized in lateral dimension, and they are two-dimensional crystallites. X-ray photoelectron spectroscopy and thermogravimetric analysis are utilized to confirm the elemental composition of nanosheets. The formation process of nanosheets is also discussed in terms of time- and temperature-controlled experiments.
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