WO2016052807A1 - Method and device for manufacturing nanodiamonds - Google Patents

Abstract

The present invention relates to a method and device for manufacturing nanodiamonds, the method comprising the steps of: providing a first member, which is made of a carbon material, electrically connected between electrodes within a chamber having a liquid contained therein, and a second member, which is made of a carbon material or a conductive material, spaced apart from the first member and electrically connected between the electrodes; and applying electrical energy to the electrodes so as to produce nanodiamonds through a collision between the first and second members, which is caused by a shock wave due to electrical explosion in the liquid and attraction due to electromagnetic force. Therefore, the present invention can produce nanodiamonds by causing a plurality of carbon materials or a carbon material and a conductive material to collide with each other by an accelerated collision due to electromagnetic force therebetween and by a shock wave due to electrical explosion, and the so-produced nanodiamonds can be easily purified and dispersed. Further, the present invention can easily separate pure nanodiamonds from carbon residues and obtain nanodiamonds which are dispersed without agglomeration.

Description

Nano diamond manufacturing method and apparatus

The present invention relates to a method and apparatus for manufacturing nanodiamonds, and more particularly, to nanoparticles by colliding an impact wave caused by an electrical explosion with an acceleration force caused by electromagnetic force between a plurality of carbon materials or between a carbon material and a conductive material. It is possible to produce, and the resulting nanodiamonds relates to a nanodiamond manufacturing method and apparatus characterized in that the purification and dispersion is easy.

Diamond has the highest hardness among the existing materials, so it is excellent in abrasion resistance, and is an optimal material for machining high-hard surfaces. At present, natural diamond or nano diamond which is artificially synthesized under high temperature and high pressure is used.

Nano diamond is theoretically colorless and transparent, so that even if it is used as a coating agent or dispersed in a polymer or the like, its appearance cannot be detected. In addition, the diamond has a high hardness, electrical insulation, excellent heat transfer properties and excellent chemical stability, so that various industrial applications, such as abrasives, heat-dissipating materials and drug-transfer materials are possible, and the research of these nanodiamonds is increasing.

The nanodiamond has a crystal structure in which the center is composed of sp ³ hybrid orbitals, and the surface has an sp ² orbital structure. Therefore, the core retains the properties of the diamond, but the surface is highly reactive, allowing many atoms or molecules to bond to dangling bonds by chemical reactions. Their composition depends on how the nanodiamond is synthesized. . Chemical bonds present on the surface of the particles contribute to stabilizing the surface of the nanodiamond particles and may also attach various functional groups to the surface of the nanodiamonds through new chemical reactions.

Representative techniques for producing such a nanodiamond include high temperature and high pressure method, synthetic method using shock wave, chemical vapor deposition method, chemical explosion method, ultrasonic method, laser method and the like. Among them, the chemical vapor deposition method uses a gas such as methane or hydrogen as a raw material, as in the prior art, 'Method for preparing nano-mechanical synthetic diamond material for manufacturing diamond tools for mirror processing', Korean Patent Laid-Open Publication No. 10-2006-0134515. And energy input for decomposition and synthesis under a high temperature and low pressure atmosphere. In addition, the chemical explosion method detonates and purifies a carbon-containing explosive mixture having a negative oxygen balance in a gas medium inert to condensed carbon, such as 'Korean Patent Registration No. 10-1203835 Nano Diamond and a manufacturing method thereof'. To produce nanodiamonds.

As such, the most commonly used method for producing nanodiamonds is a chemical explosion method using high temperature and high pressure. In a general laboratory, a high temperature atmosphere can be easily formed, but there are many difficulties in forming a high pressure atmosphere. In particular, when the chamber is sealed for a high pressure atmosphere there is a problem that the chamber is broken by the pressure. In addition, when manufacturing nanodiamonds using such chemical explosion method, since carbon materials other than nanodiamonds are tightly bonded to each other, purification through heat treatment and acid treatment is essential, and nanodiamond particles are solidly aggregated to prevent dispersion. It is very difficult and is an obstacle to industrial applications.

Accordingly, an object of the present invention is to generate nanodiamonds by colliding a shock wave due to an electrical explosion and an acceleration force caused by electromagnetic force between a plurality of carbon materials or between carbon materials and a conductive material, and the resulting nanodiamonds are purified and dispersed. It is to provide a method and apparatus for producing a nanodiamond, characterized in that easy.

Another object of the present invention is to provide a method and apparatus for producing nanodiamonds which are easy to separate pure nanodiamonds from carbonaceous residues and are dispersed without agglomeration.

The above object is, the first member of the carbon material (Carbon material) is electrically connected between the electrode portion (Electrodes) in the chamber containing the liquid, and the electrical connection between the electrode portion (Electrodes) spaced apart from the first member Providing a second member of a carbon material or conductive material; And applying nano energy to the electrode unit to generate nanodiamonds through collision between the first member and the second member by an attractive force due to shock waves and electromagnetic forces caused by submerged electric explosion. It is achieved by a diamond manufacturing method.

The first member and the second member is preferably installed parallel to each other along the length.

Here, it is preferable that the liquid is water (H ₂ O) such that the graphite layer present on the surface of the nanodiamonds is converted into carbon dioxide (CO ₂ ) in combination with oxygen in the plasma generated during the electrical explosion.

The carbon material may be graphite, graphene, activated carbon, soft carbon, hard carbon, carbon black, carbon nanotube, CNT), carbon nano fiber (CNF), modified carbon (Modified carbon), carbon composite material (Carbon composite) and a mixture thereof is preferably selected from the group consisting of, after the step of producing the nanodiamond, The nanodiamond is preferably obtained through any one of classification, washing, filtration and precipitation using a magnet.

Here, the electrode portion to which the first member is electrically connected, the electrode portion to which the second member is electrically connected is the same electrode portion, or the electrode portion to which the first member is electrically connected, and the second member is electrically connected. The electrode parts connected to each other are preferably different electrode parts.

A plurality of second members may be installed on the first member, and the first member may be installed between the second members.

The object is to provide a first member of carbon material electrically connected between electrode parts in a chamber containing liquid, and a third member of carbon material spaced apart from the first member. Steps; Shock wave due to the submerged electric explosion generated by applying electricity to the first member is also achieved by the method of producing nanodiamonds comprising the step of generating nanodiamonds by colliding with the third carbon material.

Here, the third member is preferably bulk graphite.

The above object also includes a chamber for storing a solvent; An electrode part disposed in the chamber and having a first connection part for electrically connecting the first member of the carbon material, and a second connection part spaced apart from the first connection part to electrically connect the second member of the carbon material or the conductive material Wow; A power supply unit applying electricity to the electrode unit; It is also achieved by the nano-diamond manufacturing apparatus comprising a control unit for controlling the power applied from the power supply unit to the electrode unit.

Herein, the control unit changes a current direction of the power applied from the power supply unit to the electrode unit, and the electrode unit includes a first electrode unit to which the first member is electrically connected, and a second unit to which the second member is electrically connected. Preferably, the electrode unit is the same one electrode unit, or the electrode unit is separated from each other by a first electrode unit to which the first member is electrically connected, and a second electrode unit to which the second member is electrically connected.

In addition, a plurality of second connection parts to which the second member is connected may be installed to be spaced apart from a plurality of first connection parts to which the first member is connected, and a first connection part to which the first member is connected may be connected to the second member. It is preferable to be installed between the two connecting portions.

According to the configuration of the present invention described above, it is possible to generate nanodiamonds by colliding the impact wave due to the electrical explosion and the acceleration collision caused by the electromagnetic force between the plurality of carbon materials or between the carbon material and the conductive material, the nanodiamonds produced The effect of easy purification and dispersion can be obtained.

In addition, it is easy to separate the pure nanodiamond from the carbonaceous residue, it is possible to obtain a nanodiamond dispersed without agglomeration with each other.

1 and 2 are views of the nanodiamond manufacturing apparatus according to the first embodiment,

3 is a view of the nano-diamond manufacturing apparatus according to the second embodiment,

4 is a view of the nano-diamond manufacturing apparatus according to the third embodiment,

5 is a flowchart of a nanodiamond manufacturing method according to an embodiment,

6 is a view showing a plasma state of the graphite rod,

7 is a view showing a state in which nanodiamonds are dispersed,

8a to 8e is a flow chart showing a collision process of the graphite rod,

FIG. 8F is a graph showing a process of producing nanodiamonds according to a time variation of FIGS. 8A to 8E.

9 is a graph showing the speed of each graphite rod according to the time change of the current,

Figure 10a is a photograph showing the dispersion state of the nano diamond and graphite residues,

Figure 10b is a photograph showing a nano diamond colloid after filtering on the filter paper,

10c is a photograph showing nanodiamonds filtered on filter paper;

11 and 12 are graphs showing Raman analysis of graphite and nanodiamonds,

13A and 13B are electron microscope (TEM) images of nanodiamonds.

Hereinafter, a method and apparatus for manufacturing nanodiamonds according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 1, the nanodiamond manufacturing apparatus 100 includes a chamber 110, an electrode unit 130 positioned in the chamber 110, and a power supply unit 150 for applying electricity to the electrode unit 130. And a control unit 170 for controlling the power applied from the power supply unit 150 to the electrode unit 130.

The chamber 110 is a liquid for collision of the first member 10 made of a carbon material, the second member 20 made of a carbon material or a conductive material which is installed to face the first member. (Liquid, 30) to store, the nano-diamond manufacturing is made in the chamber (110).

The electrode unit 130 includes a pair of electrodes 131 and is immersed in the liquid 30 stored in the chamber 110. Each electrode 131 has a first connector 133 for electrically connecting the first member 10 and a second connector for electrically connecting the second member 20 spaced apart from the first connector 133. (135). The first connection portion 133 and the second connection portion 135 may be any structure that can connect the electrode 131 and the first member 10 and the second member 20, the preferred structure is the insertion hole in the first And the second member (10, 20) may be inserted or made in various forms such as bolt-nut, thread, pin. Among them, the most preferred method is in the form of an insertion hole, as shown in FIG.

The electrode material of the electrode unit 130 is tungsten, stainless steel, titanium, copper, aluminum, iron, nickel, chromium, and chromium. Molybdenum (Molybdenum), Silver (Silver), Gold (Pold) It is preferably selected from the group consisting of platinum (Platinum) and mixtures thereof.

As shown in FIG. 1, the electrode member 130 of the nanodiamond manufacturing apparatus 100 according to the first embodiment is inserted into each electrode 131 such that the first member 10 and the second member 20 are inserted. Ball-shaped first and second connectors 133 and 135 are formed. The first and second connectors 133 and 135 are formed at positions spaced apart from each other so that the attraction force by the electromagnetic force can be applied between the first member 10 and the second member 20. In some cases, as shown in FIG. 2, the second member 20 has a plurality of second connectors 135 spaced apart from the first connector 133, and the plurality of second members 20 are spaced apart from the first member 10. In detail, the first connector 133 may be formed between the second connector 135 so that the first member 10 may be installed between the plurality of second members 20. In addition, power may be applied through contact between the electrode unit 130, the first member 10, and the second member 20 without separately providing the first and second connectors 133 and 135.

The power supply unit 150 for applying electricity to the electrode unit 130 is connected to the end of the electrode unit 130. In addition, the control unit 170 is connected to the power supply unit 150, and the control unit 170 controls the capacity of electricity emitted from the power supply unit 150 and the switch 190 for performing and blocking the transfer of electricity. In addition, it is possible to adjust the direction in which electricity is supplied through the control unit 170.

The first member 10 and the second member 20 supported by one electrode unit 130 receive current in the same direction by the power supply unit 150. When the current in the same direction is applied to the first member 10 and the second member 20, the shock wave due to the electrical explosion in the liquid between the first member 10 and the second member 20, and the attraction force due to electromagnetic force This will cause a crash.

3 is a nanodiamond manufacturing apparatus 200 according to the second embodiment, the chamber 210 and the power supply unit 250 are the same as the first embodiment, but there is a difference in the electrode unit 230. The electrode unit 230 according to the second embodiment of the present invention is provided with a first electrode unit 231 including a pair of electrodes to which the first member 10 is electrically connected, and a second member 20 electrically connected thereto. The second electrode part 232 is formed of a pair of electrodes, and the first electrode part 231 and the second electrode part 232 are separated from each other and disposed in the chamber 210. The first electrode part 231 and the second electrode part 232 spaced apart from each other, the first member 10 and the second member 20 are disposed separately, and the first member ( 10) and the second member 20 are spaced apart in parallel to each other. In this case, the power supply unit 250 is connected to the electrode unit 230 such that current flows in the same direction to the first electrode unit 231 and the second electrode unit 232.

FIG. 4 is a nanodiamond manufacturing apparatus 300 according to a third embodiment, in which a third member 40 made of a bulk carbon material is disposed below the chamber 310, and an electrode is formed on the third member 40. The unit 330 is disposed. When electricity is applied to the electrode unit 330 through the power supply unit 350, the second member 20 generates an electric explosion, and a shock wave is generated to generate nanodiamonds through collision with the lower third member 40.

The nanodiamond manufactured through the nanodiamond manufacturing apparatus 100 is made of the following steps. Nanodiamond manufacturing step will be described using the nanodiamond manufacturing apparatus 100 according to the first embodiment.

The first member 10 is graphite, graphene, activated carbon, soft carbon, hard carbon, carbon black, carbon nanotubes. Nano tube, CNT), carbon nano fibers (CNF), modified carbon (Modified carbon) and carbon composite material (Carbon composite) and is preferably selected from the group consisting of. In an embodiment of the manufacturing method, the first member is described as a graphite rod.

The second member is a carbon material or a conductive material. Preferably, the carbon material is a graphite rod, and the conductive material is a metal rod made of a conductive metal such as copper (Cu), aluminum (Al), nickel (Ni), or the like. In the following examples it will be described that the second member is also a graphite rod. That is, in the embodiment of the manufacturing method will be described a step of producing nanodiamond through a pair of graphite rods.

First, as shown in FIG. 5, a pair of graphite rods are immersed in the liquid 30 (S1).

The pair of graphite rods are supported by the electrode unit 130 and immersed to be completely submerged into the liquid 30 present in the chamber 110. The chamber 110 fills the liquid leaving a sufficient space to absorb the volume expansion therein. For example, in the case of the 20L chamber 110, 10L of the lower part is filled with a liquid, and 10L of the upper part is left in an empty space so that the chamber 110 is not damaged by the expansion of the liquid 30 by the explosion.

The pair of graphite rods are installed in parallel to the same electrode unit 130 so as to receive current in the same direction, or are disposed to face different electrode units 230. Graphite rods have a diameter and a length in a wire shape, and can be variously applied according to a scale for producing nanodiamonds.

The liquid 30 is composed of water (H ₂ , H ₂ O), distilled water (Distilled water), methanol (Methanol), ethanol (Ethanol), propanol (Propanol), isopropanol (Isopropanol), butanol (Butanol) and its It is preferable that it is 1 type selected from the mixture group, In addition, various organic solvents can be used. In addition, an acidic liquid for promoting the oxidation reaction may be further added. Among them, water (H ₂ O) that is easily supplied with plasma oxygen is most preferable when the graphite layer is combined with oxygen in the plasma to be changed into carbon dioxide.

Before applying electricity to the electrode unit 130, the power supply unit 150 is charged with a voltage of 20 kV while the high voltage high current switch is opened.

The nano-diamond is generated by applying electricity to the graphite rod supported by the electrode unit 130 (S2).

A high voltage of 1 to 100 kV is applied to the electrode unit 130 by using a high voltage high current switch connected to the power supply unit 150 in a state where charging is completed. When the switch is closed, current begins to flow through the electrode portion and the graphite rod. At this time, the power supply unit 150 is a pulsed power (Pulsed power) technology by applying a high voltage instantaneously to flow a large current, and preferably has a capacity of 10 to 1000 kW. This current flows into the pair of graphite rods in half, and the attraction force by the currents in the same direction acts.

When a high voltage is momentarily applied to the electrode unit 130, a pulsed large current flows through the electrode 131, and the graphite rod disposed on the electrode 131 is heated to a temperature at or above the boiling point. As a result, the plurality of graphite rods generate rapid volume expansion in the liquid 30 and generate shock waves.

A plurality of graphite rods are attracted to each other by the attraction force by the electromagnetic force in addition to the generation of shock waves in the liquid (30). The plurality of graphite rods, which are heated in the liquid 30, are accelerated and collided in the pulling direction by the Lorentz's force, and then the particle surface oxidation reaction by plasma occurs. At the time when the generated shock wave and the graphite rod collide with each other, the graphite rod is generated with a pressure of 100,000 atmospheres or more, which allows phase change to nanodiamonds.

The force exerted by each graphite rod by the pulse current can be calculated by the following equation.

<Equation 1>

In Equation 1, F ₁ represents the force of the upper graphite rod, F ₂ represents the force of the lower graphite rod. The Lorentz force due to the rail-type structure mainly acts on the graphite rod at the top, and the graphite rod at the top is accelerated to the bottom by the attraction of the current and Lorentz's force, and the graphite rod at the bottom is attracted to the graphite rod on the top. Is accelerated upwards.

Where μ ₀ is the vacuum permeability, l is the length of the graphite rod between the electrodes 131, i is the current flowing through the graphite rod, d is the distance between the centers of the first member 10 and the second member 20, L ' Inductance per unit length of the electrode 131 is shown. Where L 'is expressed as Equation 2 below.

<Equation 2>

In Equation 2, L represents the inductance of the electrode 131.

Equations 1 and 2 as described above can maximize the yield of the nano-diamond by adjusting the capacity of the pulse power, the diameter of the graphite rod, the length of the graphite rod and the shape of the electrode 131 to the optimum conditions.

As shown in FIG. 6, the graphite rod heated to a high temperature generates an explosion in which atoms change into a plasma state, and the shock wave caused by the explosion collides with the other graphite rod to form nanodiamonds 50. At the same time, two plasma columns collide with each other by the electromagnetic attraction between the two graphite rods, thereby creating a higher temperature and pressure, thereby promoting the production of the nanodiamond 50. In addition, the effect of the collision makes the material present in the molten state at high temperature, high pressure to nanosize. When the two current flows are combined by the collision, the attraction force disappears, but the Lorentz force becomes larger, and as shown in FIG. 7, the material is strongly dispersed in the liquid.

When the nanodiamond 50 particles are generated, a graphite layer which is not reacted is surrounded on the surface of the nanodiamond, and the graphite layer on the surface of the particle is combined with oxygen in the plasma to change into carbon dioxide gas by the plasma state. Through this process, pure nanodiamonds 50 having no graphite layer on the surface are produced.

Nano diamond is obtained from the graphite residue (S3).

The nanodiamond 50 particles produced in an extreme ultra high pressure state of instantaneously 100,000 or more pressures are rapidly cooled by the liquid 30 and do not return to the graphite state, but are dispersed with the graphite residue in the liquid in the nanodiamond shape. Exists as.

After discharge, all of the energy stored in the power supply unit 150 is consumed and the current becomes zero. Even when discharged, dispersion is maintained by the electromagnetic force acting on the graphite rod. The material in the hot droplet state may be rapidly cooled to minimize the reaction of the nanodiamond 50 to change back to graphite. Also at this stage the volume expansion of the liquid will affect the external mechanism.

When the nanodiamond 50 is produced in the liquid 30, not only the nanodiamond 50 but also graphite residues are present in the liquid 30. Thus, pure nanodiamonds 50 are obtained from the graphite residues in the liquid 30 using any one of Classification, Wash, Filtration and Precipitation or by any method.

Since the nanodiamond 50 is attached to the magnet, the pure nanodiamond 50 may be obtained from the liquid and the graphite residue through a classification method using a permanent magnet or an electromagnet.

In addition, the produced pure nanodiamond 50 particles are in a highly dispersed state in which the individual particles are independently present, so that the dispersed or precipitated nanodiamond 50 can be purely separated from the graphite residue by simple filtration. Can be.

As described above, the manufacturing of the nanodiamond 50 may be represented by a graph over time as shown in FIG. 8. 8A shows that the graphite rod is heated to a high temperature by a current, and the temperature of the graphite is considered to be heated to a temperature of 4000K or more. At this time, the electromagnetic attraction due to the electric current in the same direction acts to accelerate the graphite rods closer to each other.

FIG. 8B shows a plasma generated by expansion of a graphite rod heated to a high temperature and a gas generated by a chemical reaction (C + 2O → CO ₂ ) on the surface of the graphite rod and insulation breakdown generated through the gas layer. Sudden volume expansion occurs in the generated plasma, creating a strong shock wave of 100,000 atmospheres or more. The generated shock wave propagates to the surroundings and collides with the facing high temperature graphite bars, thereby converting the high temperature graphite to diamond.

8C shows that the attraction due to the co-directional current causes two graphite rods to collide with each other. This collision causes a stronger pressure to greatly increase the possibility of diamond formation. In addition, due to the collision, the diamond state disintegrates into nano-size particles and scatters. At this time, the current flows into one, so the attraction force disappears and the acceleration force acting downward greatly increases.

FIG. 8D shows that the acceleration force is maintained by the current flowing continuously even after the explosion collision, and the plasma state is also maintained to maintain dispersion and surface oxidation reaction of the generated nanoparticles. This oxidation reaction serves to remove the graphite layer on the particle surface reduced from diamond to graphite due to the pressure drop. This process produces a highly dispersed nano diamond 50 that does not require heat treatment.

8E shows that the electromagnetic acceleration force disperses the nanodiamonds 50 generated in the liquid with a strong force, thereby enabling rapid cooling. In addition, the reduction of the nanodiamond 50 to graphite is minimized to increase the production yield of the nanodiamond 50. In this process, liquid fluctuations in the chamber are generated, resulting in large impact sounds and vibrations.

Such a nano diamond 50 manufacturing method is manufactured through the following embodiments.

<Example>

7L of distilled water is added to the chamber, and the electrode part, which is made of stainless steel (SUS) and has a pair of electrodes, is immersed. A pair of graphite rods having a diameter of 2 mm and a length of 50 mm is disposed in the electrode portion. The pair of graphite rods are spaced at intervals of 7 mm. After immersing the electrode portion in distilled water, a high voltage of 20 kV is instantaneously applied using a power supply portion having a capacitance of 200 kV to the electrode portion.

FIG. 8F shows a graph with time intervals and currents during the reaction of FIGS. 8A-8E. When a high voltage is applied, a current of 100 kA is instantaneously flowing as shown in FIG. 8F, thereby heating the graphite rod above the melting point. The heated graphite rods decrease in distance between the rods at a distance of 7 mm and finally collide by the attraction force due to electromagnetic force to generate nanodiamonds. The time taken for the graphite rods to collide is 30 ms with a 0 mm spacing. At this time, the speed of each graphite rod can be confirmed through FIG. v1 represents the speed at which the upper graphite rod moves in the lower graphite rod direction, and v2 represents the speed at which the lower graphite rod moves in the upper graphite rod direction.

In order to obtain the resulting nanodiamond purely, it is allowed to stand at room temperature for 2 days to precipitate, and then the supernatant is filtered using 1.0 μm filter paper. FIG. 10A is a liquid containing nanodiamond and graphite residues, FIG. 10B is a nanodiamond colloid after filtering with a 1.0 μm filter paper, and FIG. 10C is again collecting a liquid passing through the 1.0 μm filter paper into a 0.2 μm filter paper. One nano diamond particle. The nanodiamond is thus filtered and dried to obtain pure nanodiamonds from which graphite residues are finally removed.

The nanodiamonds manufactured through the above example are Raman analysis data of FIG. 11, and are filtered using a raw material graphite rod (L1), particles precipitated in a liquid after the reaction (L2), and a filter paper having a thickness of 1.0 μm. (L3) and particle | grains (L4) which filtered the solution which passed 1.0 micrometer again using 0.2 micrometer filter paper are shown. The peak appearing around 1330 cm ⁻¹ here is due to sp ³ , and the peaks appearing around 1580 and 2700 cm ⁻¹ are peaks due to sp ² . As is known, graphite has a structure of sp ² bonding in a two-dimensional shape, and diamond has a structure of sp ³ bonding in a three-dimensional shape. Since the precipitated particles also show the same peak as the raw graphite rod, it can be confirmed that the precipitate is a graphite residue. In the case of particles collected on a 1.0 μm filter paper, a peak similar to that of precipitated particles was confirmed, indicating that most of graphite was present. On the other hand, the particles collected on the 0.2 ㎛ filter paper can hardly see the peak in the 2700cm ^-1 region, it can be seen that only pure nanodiamonds were obtained.

The peak of the raw material graphite rod (L1) confirmed in Figure 11 and the prepared sample (L4) filtered on 0.2 ㎛ filter paper can be confirmed more accurately through FIG. The prepared sample was confirmed that the 2700cm ^-1 peak due to the graphite structure is almost disappeared, and also the ratio of sp ³ (D-band) / sp ² (G-band) is about 1/4 of the raw graphite rod. However, it can be seen that the sample filtered on the 0.2 μm filter paper increased the ratio to 1/1.

Through such a method and apparatus, the graphite is collided by the attraction force of the electromagnetic force between the plurality of graphite, and the scanning electron microscope picture of FIG. 13A, the transmission electron microscope picture of FIG. 13B, Likewise, it is possible to produce nanodiamonds, and it is possible to simply manufacture nanodiamonds in a laboratory without using a conventional chemical explosion method. In addition, since the produced nanodiamonds are produced in a dispersed state without agglomeration, pure nanodiamonds can be obtained through purification by a simple method. As a result, the post-treatment process is not complicated, and nanodiamonds can be pasted immediately, which greatly shortens and accelerates industrial applications. The present invention can be applied not only to the production of nanodiamonds, but also to the fields of conventional nanopowder production and synthesis, and the like, and can be utilized to develop nanodiamond production methods using similar pulse power technology.

The present invention relates to a method and apparatus for manufacturing nanodiamonds, and more particularly, to nanoparticles by colliding an impact wave caused by an electrical explosion with an acceleration force caused by electromagnetic force between a plurality of carbon materials or between a carbon material and a conductive material. It is possible to produce, and the resulting nanodiamonds can be used in the field of nanodiamond manufacturing method and apparatus characterized in that the purification and dispersion is easy.

Claims (17)

1. In the nanodiamond manufacturing method,

   A first member of carbon material electrically connected between the electrode parts in the chamber containing the liquid and a carbon material or conductive electrically spaced apart from the first member and electrically connected to the electrode parts. Providing a second member of a conductive material;

   And applying nano energy to the electrode unit to generate nanodiamonds through collision between the first member and the second member by an attractive force due to shock waves and electromagnetic forces caused by submerged electric explosion. Diamond manufacturing method.
2. The method of claim 1,

   The first member and the second member is a nanodiamond manufacturing method, characterized in that installed parallel to each other along the length.
3. The method of claim 1,

   The nano-diamond manufacturing method, characterized in that the liquid is water (H ₂ O) so that the graphite layer present on the surface of the nano-diamond is combined with oxygen in the plasma generated during the electrical explosion to change to carbon dioxide (CO ₂ ).
4. The method of claim 1,

   The carbon material,

   Graphite, Graphene, Activated Carbon, Soft Carbon, Hard Carbon, Carbon Black, Carbon Nanotube (CNT), Carbon Nano-diamond manufacturing method, characterized in that selected from the group consisting of carbon nanofibers (CNF), modified carbon (Modified carbon), carbon composite material (Carbon composite) and mixtures thereof.
5. The method of claim 1,

   After the step of producing the nanodiamonds,

   The nanodiamond is a nanodiamond manufacturing method, characterized in that obtained through any one of the classification (Classification), washing (Wash), filtration (Filter) and precipitation (Precipitation) using a magnet.
6. The method of claim 1,

   And an electrode portion electrically connected to the first member and an electrode portion electrically connected to the second member.
7. The method of claim 1,

   And an electrode portion electrically connected to the first member and an electrode portion electrically connected to the second member are different electrode portions.
8. The method of claim 1,

   The second member is a nanodiamond manufacturing method, characterized in that a plurality of spaced apart is installed on the first member.
9. The method of claim 8,

   The first member is a nanodiamond manufacturing method, characterized in that installed between the second member.
10. In the nanodiamond manufacturing method,

    Providing a first member of carbon material electrically connected between the electrode portions in the chamber containing the liquid, and a third member of carbon material spaced apart from the first member;

    And impacting the third carbon material with a shock wave caused by the electric explosion in the liquid generated by applying electricity to the first member, to produce nanodiamonds.
11. The method of claim 10,

    The third member is a nano-diamond manufacturing method, characterized in that the bulk graphite (Bulk graphite).
12. In the nano diamond manufacturing apparatus,

    A chamber for storing the solvent;

    An electrode part disposed in the chamber and having a first connection part for electrically connecting the first member of the carbon material, and a second connection part spaced apart from the first connection part to electrically connect the second member of the carbon material or the conductive material Wow;

    A power supply unit applying electricity to the electrode unit;

    Nano-diamond manufacturing apparatus comprising a control unit for controlling the power applied from the power supply to the electrode.
13. The method of claim 12,

    The control unit is a nanodiamond manufacturing apparatus, characterized in that for changing the current direction of the power applied from the power supply to the electrode.
14. The method of claim 12,

    The electrode unit is a nano-diamond manufacturing apparatus, characterized in that the first electrode portion is electrically connected to the first member and the second electrode portion is the same as the second electrode portion electrically connected to the second member.
15. The method of claim 12,

    The electrode unit is a nano-diamond manufacturing apparatus, characterized in that separated from each other by a first electrode portion electrically connected to the first member and a second electrode portion electrically connected to the second member.
16. The method of claim 12,

    The second connection portion to which the second member is connected nano-diamond manufacturing apparatus, characterized in that a plurality of spaced apart is installed in the first connection portion to which the first member is connected.
17. The method of claim 16,

    The first connection portion to which the first member is connected nano diamond manufacturing apparatus, characterized in that installed between the second connection portion is connected to the second member.

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