The optimised morphology of electrospun magnesium oxide (MgO)
nanofibers (NFs) can be achieved according to the parameters set during the
fabrication process. However, not all materials can be synthesized together
as it depends on the application needs. This research aims to study the factors
that influence the morphology of the MgO NFs due to material preparations
and electrospinning parameters. The research is based on data obtained
from previous research papers that were analysed using MATLAB R2019a
software to evaluate the effect on MgO nanofibers synthesized with different
materials. The study was focused on textural properties of nanofibers such
as pore-volume and fiber diameter. Based on the analysis obtained,
researchers need to consider using polymer material during the
electrospinning fabrication. Each type of the polymer used will produce
different values of the MgO NFs diameter after calcination process. Polypropylene glycol polymer showed a very significant difference in the fiber
diameter size in the range of 60 to 76 nm as compared to polylactic acid
produced big size of fiber diameter in between 3300 to 6900 nm.The analysis
showed that the use of nitrogen as a carrier gas in the fabrication of
electrospun MgO NFs may produce a good quality of the nanofibers.
This study aims to identify the expression of emotions and how emotions are controlled by adolescents. The sample comprised three male and two female students who were from a secondary school located in Penang. Semi-structured interviews were conducted in this study. Transcribed contents of the interviews were analyzed. The main findings showed generally, adolescents like to have fun, seek to try something new, like to relax with friends, and they also follow their feelings. Female adolescents were found to be sensitive. Generally, adolescents indicated that they were more comforlable sharing problems with friends than with parents. Implications of findings area also discussed.
Tin Oxide (SnO2) is an n-type semiconductor with a direct bandgap of 3.6eV.
It is highly conductive, transparent, and gas sensitive. The SnO2 can be
unstable depending on certain parameters and methods to prepare it. In this
work, the thin film of SnO2 doped with Al2O3 was deposited by
electrospinning on glass substrates. The thin films were then annealed at
100°C, 200°C, 300°C, 400°C, 500°C, and then the optical and physical films
were examined. Measurements of X-Ray Diffraction (XRD) and Microscope
were performed for structural and morphological analysis. The optical
characteristics were analyzed using the UV-Vis spectrophotometer. As the
annealing temperature increases, the optical transmittance also increases
due to the increase in film homogeneity and the degree of crystallinity of the
film. The rise in temperature leads to a decrease in absorption values.