Characterization of tin selenides synthesized by high-energy milling
Tin selenides SnSeX (x=1,2) were synthesized from tin and selenium powder precursors by high-energy milling in the planetary ball mill Pulverisette 6 (Fritsch, Germany). The orthorhombic tin selenide SnSe and the hexagonal tin diselenide SnSe2 phases were formed after 4 min and 5 min of milling, respectively. Specific surface area of both selenides increased with increasing time of mechanochemical synthesis. The particle size distribution analysis demonstrated that the synthesized products contain agglomerated selenide particles consisting of numerous idiomorphic tin selenide crystals, measuring from 2 to more than 100 nm in diameter, which were also documented by TEM. UV-Vis spectrophotometry confirmed that tin selenide particles do not behave as quantum dots.
Dual-buffered SnSe@CNFs as negative electrode with outstanding lithium storage performance
Abstract Alloying with Se has been recently found to be an effective way to improve the cycling performance because the reduced-Se formations can act as a buffer matrix against the volume change of electrode for IVA materials or anchors S in Li-S batteries during cycling. In this paper, SnSe nanoparticles were dispersed within a carbon fiber matrix with ball milling and electrospinning methods. The uniform nano-architecture with SnSe nanoparticles homogeneously confined in the carbon matrix, which is revealed by X-ray powder diffraction and scanning electron microscope, provides a stable buffer and good electrical conductor for the lithiation/delithiation process. Moreover, Se-based phase acts as an additional stabilizer to alleviate Sn agglomeration during cycling. Such dual-buffered SnSe/C composites thus deliver large reversible capacity of 840 mAh/g with ultrastable cycling performance over 100 cycles and demonstrate good rate capacity.
Efficacy of life skills training on general health in students
BACKGROUND
With regard to the importance of life skills, the present study deals with the effect of life skills training on general health of the students.


MATERIALS AND METHODS
This was a one-group, pre-test, post-test, quasi-experimental research. Forty students were selected through purposive sampling method. The data collection tool was Goldberg General Health Questionnaire.


RESULTS
Paired t-test showed a 22 score significant decrease in general health after education compared to before education (P < 0.01).


CONCLUSION
This study showed that life skills education increases general health level of the students.