Facilitated Ion Transfer Across the Micro-liquid/Liquid Interface Supported at the Tip of a Silanized Micropipette

Chemical Research in Chinese Universities ›› 2003, Vol. 19 ›› Issue (1): 59-62.

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Facilitated Ion Transfer Across the Micro-liquid/Liquid Interface Supported at the Tip of a Silanized Micropipette

SU Bin, SHAO Yuan-Hua

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

Received:2001-12-17 Online:2003-01-24 Published:2011-08-06
Supported by:
Supported by Chinese Academy of Sciences(CAS), National Natural Science Foundation of China(No.29825111) and the Third World Academy of Science(TWAS) and the State Key Laboratory of Electroanalytical Chemistry of the CAS.

Abstract

Abstract: Glass micropipettes with silanized inner walls can be filled with an organic solvent for voltammetric measurements in an aqueous solution. This arrangement was employed to investigate systematically the mechanism of facilitated potassium ion transfer by an ionophore dibenzo-18-crown-6(DB18C6) across a micro-water/1,2-dichloroethane(W/DCE) interface supported at the tip of a silanized micropipette. Our experimental results verify that this facilitated ion transfer across the liquid/liquid interface did occur by an interfacial complexation-dissociation process(TIC-TID mechanism). The ratio of the diffusion coefficient of DB18C6 to that of its complexed ion in the DCE phase was calculated to be 1.74±0.07.

Key words: Silanization, Micropipette, Facilitated K⁺ transfer, Mechanism

SU Bin, SHAO Yuan-Hua. Facilitated Ion Transfer Across the Micro-liquid/Liquid Interface Supported at the Tip of a Silanized Micropipette[J]. Chemical Research in Chinese Universities, 2003, 19(1): 59-62.

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Facilitated Ion Transfer Across the Micro-liquid/Liquid Interface Supported at the Tip of a Silanized Micropipette

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