Studies On Laser Induced Breakdown Spectroscopy For Molten Salts And Self-assembly Of Rigid BTA Molecules

Molten salts have so much difference with room temperature liquids, especially they have strong corrosion on metal surface. The high temperature and strong corrosion of molten salts are huge challenges for future advanced reactor energy source. In-situ measurement and quantitative analysis on molten salts is the key to meet the above mentioned problems.Laser induced breakdown spectroscopy (LIBS) needs no special sample preparation, and has in time and remote detection abilities, which make it the most suitable method for studies on high temperature molten salts. Quantitative in situ analysis of contents of certain metals in molten salts by LIBS system can monitor the corrosion behavior and mechanism on metal surfaces in high temperature molten salts. Thus one can offer the new possibility for protection for metal surface from molten salts.Main works of this thesis are as following:1) Detailed reviews on study about high temperature molten salts and LIBS were given, and the idea of studies on molten salts by LIBS was suggested.2) A modified LIBS system was established for in situ study on molten salts, which can offer the environment free of water and oxygen. The calibration of metal contents such as Mn at the peak positions of 482.41 nm,476.32 nm and 403.21 nm were carried out.3) Coefficient of determination R2 were measured at different temperature. In room temperature, R2 is 0.98409. While it is 0.7709 when the salts is molted.4) Influence of key parameters on LIBS spectra of molten salts were studied, including the laser energy and power, the gas pressure in glove box, temperature of molten salts, etc.5) self-assembly of rigid BTA molecules were also studied.