小型NMRセンサーによる高分子電解質膜中でのメタノールの濃度差拡散係数の計測 : 第1報,計測法の開発と測定値の評価(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
A method for measuring the diffusion coefficient of methanol in a polymer electrolyte membrane (PEM) was developed using the NMR method. A circular coil of 0.6mm inside diameter was used as a small NMR sensor. The PEM was inserted in a penetration cell, where methanol solvent is supplied to one side of the PEM and nitrogen gas is supplied to the other side of the PEM. The small NMR sensor was placed on the nitrogen gas side of the PEM. The small NMR sensor detects the NMR signal from the methanol solvent which permeates the PEM. The CH and OH components of the methanol solvent were obtained from the NMR signal by spectral analysis. The methanol concentration in the PEM was determined by the ratio of CH to OH components. The methanol concentration was acquired at intervals of 30s and was measured for 2000s. After 1500 seconds, the methanol concentration in the PEM reaches a steady state. The final methanol concentration was about 20% of the methanol concentration of the solvent. It assumed that the diffusion phenomenon of methanol in a PEM was a one-dimensional transport phenomenon, and the time-dependent change of methanol concentration was analyzed by parameterizing the diffusion coefficient. The diffusion coefficient of methanol in a PEM was determined by comparison with the measurement result of the time change of methanol concentration and the analysis results. The concentration difference diffusion coefficient of methanol in PEM obtained using this method was 3.5^*10^<-10>m^2/s.
2010-05-25

小型NMRセンサーによる高分子電解質膜中でのメタノールの濃度差拡散係数の計測 : 第1報,計測法の開発と測定値の評価(熱工学,内燃機関,動力など)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク