Development of two-dimensional inverse Laplace transform NMR and application

2014 Fiscal Year Final Research Report

• Project/Area Number: 24750008
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry
• Research Institution: Chiba University
• Principal Investigator: TAKAHIRO Ohkubo 千葉大学, 工学(系)研究科(研究院), 助教 (50534541)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 二次元逆ラプラス変換 / 核磁気共鳴 / 緩和時間 / 拡散係数 / 水和反応 / 空隙構造 / 高分子膜 / 多孔質材料

Outline of Final Research Achievements

The basic principles and experimental techniques of two-dimensional analysis by NMR relaxation and diffusion are develped. A compulational program for Laplace-Laplace inversion using singular value decomposition was newly released, and verified stability on various NMR experimental parameters such as signal-to-noise ratio and sampling points. We applied relaxation-diffusion methodology to charcterize water in polymer exchange membranes with different relative humidity. At 30% RH, the diffusion coefficient of water in small-sized channels is greater than that in large-sized channels. On the other hand, the diffusion coefficients of protons with smaller and larger water channels are almost the same at 50, 70, and 90% RH.

Free Research Field

物理化学