Novel evaluation of plasticized potentiometric membranes for ion-selective electrodes by analyses of the proton spin-spin relaxation times T2 with pulsed NMR

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410155
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Analytical chemistry
• Research Institution: Osaka Institute of Technology
• Principal Investigator: MORIUCHI TAKAYO (川上隆代) 大阪工業大学, 工学部, 准教授 (60288751)
• Research Collaborator: URAHAMA Yoshiaki 兵庫県立大学, 大学院工学研究科, 連携客員教授
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: イオン選択性電極膜 / パルス法NMR / 核磁気緩和時間 / パルスシークエンス / 可塑化 / 柔剛性 / 緩和スペクトル

Outline of Final Research Achievements

A typical potentiometric polymeric membrane for ion-selective electrodes (ISEs) is composed of 1-7 wt% ionophore, 30 wt% poly(vinyl chloride) as the polymer, 66-67 wt% membrane solvent, and 1-2 wt% salt additive. Although ionophores mainly discriminate ions in a potentiometric polymeric membrane, all the components of the potentiometric polymeric membrane influence their ion-sensing behavior. Among the various physical properties of ISEs, plasticization of the potentiometric polymeric membranes will influence their ion-sensing behavior. Nevertheless, a suitable and valid analysis method to evaluate the plasticization of potentiometric polymeric membranes has yet to be developed. In this study, we proposed a novel method for the evaluation of the potentiometric polymeric membranes by analyses of the proton spin-spin relaxation times T2 with pulsed NMR.

Free Research Field

分析化学