CN104164697A - Preparation method for microelectrode needle dust - Google Patents

Abstract

The invention relates to a method for preparing microelectrode needle dust by using electrochemical corrosion, which belongs to preparation technology for microelectrode needle dust. The method comprises the following steps: a) immersing a nickel-chromium alloy wire with a diameter of 0.1 mm into NaOH with a mass concentration of 30% and maintaining the nickel-chromium alloy wire at a constant temperature of 100 DEG C for 1 h so as to remove an insulating layer on the surface of the nickel-chromium alloy wire; b) winding a circular ring with a diameter of 23 mm by using a stainless steel wire with a diameter of 1 mm, using the circular ring as a negative electrode ring, placing the negative electrode ring on a negative electrode rack, putting the negative electrode rack in an electrolyte, placing a circular cover plate at the upper side of the negative electrode rack, allowing the cover plate to be concentric to the negative electrode ring, perforating a hole with a diameter of 1 mm in the center of the cover plate, vertically arranging the nickel-chromium alloy wire treated in the step a), allowing the nickel-chromium alloy wire to pass through the center of the hole and to be fixed by a support and enabling the wire to extend into the electrolyte to a depth of more than 1 mm; and c) respectively connecting the negative electrode ring and the nickel-chromium alloy wire with a double-pole power supply through leads and carrying out energization for 20 to 40 s to allow the wire to be corroded into uniform needle dust.

Description

A kind of microelectrode pin dirt preparation method

Technical field

The present invention relates to a kind of preparation method of microelectrode pin dirt, particularly a kind of method of preparing microelectrode pin dirt with electrochemical etching method.

Background technology

Biometric mechanisms people refers to motion function, the power generating system that utilizes animal body, from the impression of animal movement, enters or innervation staff, realizes the artificial control to the motion of animal and some behavior.Biorobot's technology is one of field of the means of subsistence of current development in science and technology.The motion control of animal is be unable to do without to high performance metal microelectrode or microelectrode arrays all, and probe microelectrode has the unique advantage that density is high, arrange in order and can realize cubical array structure.Therefore in electric physiology, be widely used.In general, diameter can record electrical activity of neurons at wire and the conductor of to tens micron, but less dirt end size is difficult for making Brain shift, and is conducive to enter cerebral tissue, microelectrode is directly contacted with the neuraxis, thereby performance stimulate and writing function better.The also easier excited dirt end high neurone of threshold value around simultaneously, so pin dirt technique is to manufacture the gordian technique of probe microelectrode.

In prior art, the preparation method of pin dirt has mechanical forming method, ion beam milling method, means of electron beam deposition, field evaporation method and electrochemical erosion method etc.Wherein electrochemical erosion method is removed material with the form of ion, and convenience and high-efficiency, is conventional pin dirt preparation method.But this method is high to the response time requirement of Controlling System, and equipment cost is high, is not suitable for electric Physiological Experiment chamber and uses.

Summary of the invention

The present invention is directed to the problem that prior art exists, a kind of microelectrode pin dirt preparation method is provided, to simplify the preparation system of pin dirt, reduce preparation cost, and preparation method controls convenience, simple.

The object of the present invention is achieved like this, and a kind of microelectrode pin dirt preparation method, comprises the steps:

A) by diameter, be that 0.1mm nichrome wire immerses in the NaOH that mass concentration is 30%, 1 hour insulation layer by nichrome wire surface of 100 ℃ of insulations of constant temperature is removed;

B) annulus that is coiled into φ 23mm with the Stainless Steel Wire of φ 1mm is as cathode loop, described cathode loop is placed in a cathode carrier, in cathode carrier, be placed in electrolytic solution and upside is placed a circular cover, and cover plate is concentric with cathode loop, in the middle of cover plate, offer a φ 1mm hole, nichrome wire by step in a) vertically arrange Bing Congkong center through and by support, wire electrode is fixed to the degree of depth being submerged below electrolytic solution 1mm in wire electrode lower end;

C) cathode loop is connected with bipolar power supply by wire respectively with wire electrode, energising 20～40s, makes wire electrode be etched into uniform pin dirt type.

For ease of realizing method of the present invention, the NaCl that described electrolytic solution is 2.5g～6.0g/L, temperature is 20 ℃.

Adopt method of the present invention, after anode and cathodal closing, at wire electrode, form electric field around, wire electrode is positioned at electric field central authorities, and the pin dirt therefore corroding is mellow and full evenly.The central position strength of electric field of cathode loop is maximum, along the wire electrode strength of electric field that makes progress, weakens gradually.The local galvanic corrosion speed that strength of electric field is large is fast, and the local galvanic corrosion speed that strength of electric field is little is slow.Through corrosion after a while, just can obtain required pin dirt.Due in the electric field of wire electrode in a gradual change with the passing of upper time, the disappearance that is corroded of old pin dirt, new pin dirt forms again.Method of the present invention compared with prior art, is tested the corresponding time short, and experimental installation is simple, and the pin dirt quality of preparation is good, to requiring not strict, workable conduction time.

Accompanying drawing explanation

Fig. 1 is the device sketch that microelectrode pin dirt preparation method of the present invention adopts.

Fig. 2 is the strong distribution plan of electricity in wire electrode ambient water plane.

Embodiment

Below in conjunction with accompanying drawing, method of the present invention is described in detail.

The device that is illustrated in figure 1 microelectrode pin dirt preparation method of the present invention, method of the present invention comprises the steps:

A) by diameter, be that 0.1mm nichrome wire immerses in the NaOH that mass concentration is 30%, 1 hour insulation layer by nichrome wire surface of 100 ℃ of insulations of constant temperature is removed;

B) annulus that is coiled into φ 23mm with the Stainless Steel Wire of φ 1mm is as cathode loop 1 and be placed in a cathode carrier, in cathode carrier, be placed in electrolytic solution and upside is placed a circular cover, and cover plate is concentric with cathode loop 1, in the middle of cover plate, offer a φ 1mm hole, nichrome wire by step in a) vertically arranges that Bing Congkong center is passed and to pass through support 4 fixing by wire electrode 3, the degree of depth being submerged below electrolytic solution 1mm in wire electrode 3 lower ends;

C) cathode loop 1 is connected with bipolar power supply 2 by wire respectively with wire electrode 3, energising 20～40s, makes wire electrode 2 be etched into uniform pin dirt type.

For ease of realizing method of the present invention, the NaCl that described electrolytic solution is 2.5g～6.0g/L, temperature is 20 ℃.

Adopt method of the present invention, after anode and cathodal closing, at wire electrode 3, form electric field as shown in Figure 2 around, wire electrode 3 is positioned at electric field central authorities, and the pin dirt therefore corroding is mellow and full evenly.The central position strength of electric field of cathode loop 1 is maximum, along wire electrode 3 upwards strength of electric field weaken gradually.The local galvanic corrosion speed that strength of electric field is large is fast, and the local galvanic corrosion speed that strength of electric field is little is slow.Through corrosion after a while, just can obtain required pin dirt.Due in the electric field of wire electrode 3 in a gradual change with the passing of upper time, the disappearance that is corroded of old pin dirt, new pin dirt forms again.Method of the present invention compared with prior art, is tested the corresponding time short, and experimental installation is simple, and the pin dirt quality of preparation is good, to requiring not strict, workable conduction time.

The present invention is not limited to above-described embodiment; every on the basis of technical scheme disclosed by the invention; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some replacements and distortion to some technical characterictics wherein, these replacements and distortion are all in the scope of protection of the invention.

Claims (2)

1. a microelectrode pin dirt preparation method, comprises the steps:

A) by diameter, be that 0.1mm nichrome wire immerses in the NaOH that mass concentration is 30%, 1 hour insulation layer by nichrome wire surface of 100 ℃ of insulations of constant temperature is removed;

B) annulus that is coiled into φ 23mm with the Stainless Steel Wire of φ 1mm is as cathode loop, described cathode loop is placed in a cathode carrier, in cathode carrier, be placed in electrolytic solution and upside is placed a circular cover, and cover plate is concentric with cathode loop, in the middle of cover plate, offer a φ 1mm hole, nichrome wire by step in a) vertically arrange Bing Congkong center through and by support, wire electrode is fixed to the degree of depth being submerged below electrolytic solution 1mm in wire electrode lower end;

C) cathode loop is connected with bipolar power supply by wire respectively with wire electrode, energising 20～40s, makes wire electrode be etched into uniform pin dirt type.

2. microelectrode pin dirt preparation method according to claim 1, is characterized in that, the NaCl that described electrolytic solution is 2.5g～6.0g/L, and temperature is 20 ℃.