雷射捕陷應用於溫敏聚合物之相轉變及分析化學之研究

Abstract

此研究主要意在了解溫敏聚合物-PIPOZ 於 PIPOZ/H2O 以及 PIPOZ/BuOH/H2O 之二元,三元溶劑系統中於雷射誘導下產生相分離(LIPS)之行為,並進一步應 用於分析化學之微量萃取技術。 在此研究中,我們示範了利用雷射捕陷技術於 PIPOZ/H2O 和 PIPOZ/BuOH/H2O 之二元,三元溶液系統內之特定空間中誘發單一微粒子的形成,並且穩定地將微 粒子捕捉在雷射之焦點上。於研究中我們亦發現,雷射誘發微粒所需的能量,三 元系統相較於二元系統其能量需求降低了非常多,此一結果充分的反映了 PIPOZ 的 cononsolvency 效應。除此之外,在三元溶液系統中所形成的微粒子與在二元 溶液系統形成的微粒子非常不同,三元溶液系統之微粒子在雷射照射停止後並沒 有如二元系統般迅速的消失。 另外,在微量萃取的部份,我們利用上述之 LIPS 技術進行了將染料分子羅丹 明 B 以 PIPOZ 之微相分離之微量萃取。所得的結果顯示,利用雷射 LIPS 技術所 萃取的萃取效率相比於普通萃取有相當程度的提升。此效率之提升可以被歸因為 形成之萃取微顆粒成分之疏水程度提高以及雷射染料分子的雷射光壓收集現象 之協同現象。

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.