CHAPTER 2
LITERATURE REVIEW
2.1 Effect of Binder and Plasticizers on the Gel Viscosity, Membrane Morphology and Pore Size
According to M.R. Othman [7] the result of addition of PVA in Boehmite sol during peptization on the viscosity, coating time, pore size and BET surface area is presented in Table I,II,III, and IV. PVA was prepared by dissolving 2, 4, 6 and 8g of PVA powder into 100mL de-ionized distilled water. PVA with different concentration in the sol give a of characteristics viscosity range. It was noted that the viscosity of the sol increased as the PVA addition was increased. On the contrary, the coating time and BET surface area decrease as PVA content in the sol was increased. From table I and Table II, the abrupt change in coating time as viscosity increased when PVA in sol was increase from 2% to 3% was observed. However, more continuous change in coating time was observed from Table III and Table IV. This is because of significant change of viscosity at the region as viscosity is related to the coating.
The mean pore size of the membrane was determined directly from autosurb analysis. The pore size of membrane increased with the increase in PVA addition as indicated in …show more content…
The TG-DTA curves showed that the main chemical reactions for LiNiMn were completed before 400°C and that further increase increase in temperature did not bring about any changes in TG curve. In the region of < 140 C, a smaller endothermic peak in the DTA curve could be attributed to loss of water from the precursor. Corresponding to the 140-250 C region, two weak endothermic peaks indicated partial decomposition of nitrates. Alarger endothermic peak could be observed at ca.300C in the 250-400 C region, which could be considered as the molting of LiNO and the formation of Li NImN accompanied by the complete decomposition of nitrates. Beyond 400C no other thermal phenomenon could be
LITERATURE REVIEW
2.1 Effect of Binder and Plasticizers on the Gel Viscosity, Membrane Morphology and Pore Size
According to M.R. Othman [7] the result of addition of PVA in Boehmite sol during peptization on the viscosity, coating time, pore size and BET surface area is presented in Table I,II,III, and IV. PVA was prepared by dissolving 2, 4, 6 and 8g of PVA powder into 100mL de-ionized distilled water. PVA with different concentration in the sol give a of characteristics viscosity range. It was noted that the viscosity of the sol increased as the PVA addition was increased. On the contrary, the coating time and BET surface area decrease as PVA content in the sol was increased. From table I and Table II, the abrupt change in coating time as viscosity increased when PVA in sol was increase from 2% to 3% was observed. However, more continuous change in coating time was observed from Table III and Table IV. This is because of significant change of viscosity at the region as viscosity is related to the coating.
The mean pore size of the membrane was determined directly from autosurb analysis. The pore size of membrane increased with the increase in PVA addition as indicated in …show more content…
The TG-DTA curves showed that the main chemical reactions for LiNiMn were completed before 400°C and that further increase increase in temperature did not bring about any changes in TG curve. In the region of < 140 C, a smaller endothermic peak in the DTA curve could be attributed to loss of water from the precursor. Corresponding to the 140-250 C region, two weak endothermic peaks indicated partial decomposition of nitrates. Alarger endothermic peak could be observed at ca.300C in the 250-400 C region, which could be considered as the molting of LiNO and the formation of Li NImN accompanied by the complete decomposition of nitrates. Beyond 400C no other thermal phenomenon could be