Composite scanning chlorion sensitive micro-probe and preparing process thereof

A micro-probe, chloride ion technology, applied in the field of probes, can solve the problems of slow response speed, short service life of liquid membrane electrodes, and difficult fabrication of micro-electrodes, etc., and achieves small tip size, simple preparation process, and improved spatial resolution. effect of ability

Inactive Publication Date: 2005-08-10
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned composite microelectrode still has technical problems such as short service life of the liquid film electrode, slow response speed, and difficulty in making the microelectrode.

Method used

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  • Composite scanning chlorion sensitive micro-probe and preparing process thereof
  • Composite scanning chlorion sensitive micro-probe and preparing process thereof
  • Composite scanning chlorion sensitive micro-probe and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The drugs used are all analytically pure, and the preparation solution uses three times of deionized water. The measurement of Ag / AgCl electrode potential-concentration curve and potential-time curve is completed by the Autolab electrochemical workstation of Eco Chemi Company. The 18-8 stainless steel is polished with 400 to 1000 water abrasive paper in turn, polished with 1 μm alumina polishing powder to a mirror surface, ultrasonically cleaned with anhydrous ethanol and water three times, and dried. The micro-area scanning measurement of the chloride ion concentration on the metal surface was completed by the scanning electrochemistry / scanning tunneling microscope system developed by Xiamen University.

[0026] First, take a pure silver wire with a length of 20mm and a diameter of 0.2mm, mechanically cut out a tip of 50μm at one end with sharp scissors, and then perform a constant current anodizing treatment in a HCl solution with a concentration of 0.01mol / L for 3h, ...

Embodiment 2

[0031] Similar to Example 1, the difference is that when preparing the Ag / AgCl electrode, a pure silver wire with a length of 50 mm and a diameter of 0.3 mm was used to mechanically cut out a tip of 70 μm at one end with sharp scissors, and then in a concentration of 0.001mol / L Constant current anodizing treatment in HCl solution for 5h, the control current is 0.001mA / cm2. After the anodization is completed, a layer of tan and dense AgCl film is uniformly formed on the surface of the silver wire. After the Ag / AgCl electrode was rinsed with distilled water and dried, the surface was evenly coated with a layer of nail polish with a thickness of 1 μm. When preparing the reference probe, a 50 μm tip was processed at one end of a Pt-Ir alloy (Pt70%-Ir30%) wire with a length of 50 mm and a diameter of 0.3 mm.

Embodiment 3

[0033] Similar to Example 1, the difference is that when preparing the Ag / AgCl electrode, a pure silver wire with a length of 70 mm and a diameter of 0.1 mm was used to mechanically cut out a 20 μm tip at one end with sharp scissors, and then in a concentration of 0.05 mol / L Constant current anodizing treatment in HCl solution for 10h, the control current is 0.01mA / cm2. After the anodization is completed, a layer of tan and dense AgCl film is uniformly formed on the surface of the silver wire. After the Ag / AgCl electrode was rinsed with distilled water and dried, the surface was uniformly coated with a layer of nail polish with a thickness of 7 μm. When preparing the reference probe, a 20 μm tip was processed at one end of a Pt-Ir alloy (Pt70%-Ir30%) wire with a length of 70 mm and a diameter of 0.5 mm.

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Abstract

The present invention relates to a new composite scanning chlorine ion sensing microprobe and its preparation method. A metal potential sensing microprobe and a chlorine ion selectivity microprobe are fixedly connected, their exterior is covered withan encapsulation layer, and the point portions of two microprobes are bared, and the point diameter of every microprobe is respectively 10-100 micrometers. Said invention also provides the concrete steps for preparing said composite scanning chlorine in sensing microprobe by utilizing siler wire and Pt-Ir alloy.

Description

technical field [0001] The invention relates to a probe, in particular to a composite scanning chlorine ion sensitive microprobe. Background technique [0002] In the natural environment, chloride ions are a species that exists widely and has a strong depassivation effect. The inhomogeneous distribution of chloride ions at the metal / solution interface becomes the main reason for the occurrence and development of localized corrosion of metals. In 2000, Lin et al. (LinCJ, Du RG, Nguyen T. In-situ imaging of chloride ions at the metal / solution interface by scanning combination microelectrodes, Corrosion 56(1): 41-47 2000) successfully developed the Ag / AgCl electrode and liquid A composite electrode composed of a chloride ion selective membrane electrode, in which the Ag / AgCl electrode is used as a reference electrode through a microcapillary salt bridge, and the chloride ion selective liquid membrane electrode is used as a chloride ion probe. The migration and enrichment of ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 林昌健胡融刚李彦卓向东杜荣归
Owner XIAMEN UNIV
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