Polymer showing temperature-dependent phase transition: Laser trapping and its application to analytical chemistry

• Main Authors: Chen, Po-Jen, 陳伯任
• Other Authors: Li, Yaw Kuen
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/20492081758018009836

碩士 === 國立交通大學 === 應用化學系碩博士班 === 103 === We studied laser-induced phase separation (LIPS) behavior of thermoresponsive polymer, PIPOZ, in PIPOZ/H2O binary and PIPOZ/BuOH/H2O ternary solutions. Locally-induced single microparticle formation in PIPOZ/H2O binary and PIPOZ/BuOH/H2O ternary solutions by laser revealed single microparticle can be formed and stably trapped at the focal spot of trapping laser. As reflecting cononsolvency of PIPOZ in ternary solution, microparticle formation can be achieved with much lower laser power in ternary solution than that required in binary solution. The particle formed in ternary solution is different from that formed in binary solution which did not disappear quickly even trapping-laser was turned-off. We demonstrated microphase extraction of ultratrace dye molecule, RhB, by using single microparticle formed by LIPS. Extraction to the microparticle showed better extraction efficiency of RhB than that observed in bulk solution. Improved extraction efficiency can be attributed to the cooperative effect of hydrophobicity increase in the particle and concentration of the solute molecules to the particle by exerted photon pressure of the trapping laser beam.