The nickel-dimethylglyoxime microtubes were synthesized by a facile coprecipitation method. The as-prepared superhydrophobic and superoleophilic films showed excellent oil–water separation efficiency and effective photocatalytic degradation.

Abstract. The formation of ice particle density irregularities with a meter scale in the mesopause region is explored in this paper by developing a growth and motion model of ice particles based on the motion equation of a variable mass object. The growth of particles by water vapor adsorption and the action of gravity and the neutral drag force on particles are considered in the model. The evolution of the radius, velocity, and number density of ice particles is then investigated by solving the growth and motion model numerically. For certain nucleus radii, it is found that the velocity of particles can be reversed at a particular height, leading to a local gathering of particles near the boundary layer, which then forms small-scale ice particle density structures. The spatial scale of the density structures can be affected by vertical wind speed, water vapor density, and altitude, and it remains stable as long as these environmental parameters do not change. The influence of the stable small-scale structures on electron and ion density is further calculated by a charging model, which considers the production, loss, and transport of electrons and ions, along with dynamic particle charging processes. Results show that the electron density is anti-correlated to the charged ice particle density and ion density for particles with radii of 11 nm or less due to plasma attachment by particles and plasma diffusion. This finding is in accordance with most rocket observations. The small-scale electron density structures created by small-scale ice particle density irregularities can produce the polar mesosphere summer echo (PMSE) phenomenon.

Nearly monodisperse Dy2Sn2O7 material have been prepared via one-step hydrothermal method by changing the pH of the reaction solution. The nanoparticles were used for sonocatalytic degradation of Acid blue (AB)...

MnWO4 nanorods with different contents of F-doping were synthesized by a facile approach. The morphological studies further confirmed formation of MnWO4 nanorod structure with dimensional size and length of 50 nm and 100 nm, respectively. The differences of Li-storage performance that caused by F-doping contents in MnWO4 nanomaterials were systematically investigated. The results show by tuning the F-doping contents in the MnWO4 nanorods, both the reversible capacity and the cycling stability of nano-MnWO4 electrode attain remarkable improvement. Furthermore when the content of F-doping is 0.05mol%, the reversible capacity for lithium storage in nano-MnWO4 is at its maximum. What makes that all the more remarkable is that the 0.05mol% F-doped nano-MnWO4 shows a long cycle life. Even cycled under a low current density (200mAh g -1 ), the capacity retention still can keep more than 85% after 150 cycles, which are much superior to the report ones. These results provide insight into the effective method which can easily be applied to improve the electrochemical performances of the advanced electrode materials for Li ion batteries.

Controllable BaF2 microcrystals with super-hydrophobic property have been successfully synthesized via a facile hydrothermal process. XRD, SEM and CA are used to study the structure, morphology and the hydrophobic properties of the BaF2 materials. The effects of reaction time, surfactants and pH are also detailed investigated in order to get a series of accurate reaction conditions for the preparation of BaF2 material. The results show that uniform BaF2 tetragonal phase structure was fabricated when the reaction temperature was controlled at 180 oC for 24 h. In addition, the BaF2 materials showed excellent super-hydrophobic properties. The results about the influence of time and substrates exhibit that the sample can maintain the stable super-hydrophobic property for over 10 days. As a promising super hydrophobic materials, the studies of BaF2 reported in this paper is quite practical and it has a certain guiding meaning for the future study about super hydrophobic materials.