Process and apparatus for producing metal nanoparticles

Inactive Publication Date: 2007-05-10
JAWAHARLAL NEHRU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024] The nanomaterials that have been realized are independent particles, comparable in size to other nanomaterials reported in the prior art literature. The process is

Problems solved by technology

However, industrial applications for such particles are limited due to the low production rates and high cost.
However, except for precious metals, chemical methods are generally not applied to the production of metallic nanoparticles.
The main drawback of this process is that it is time consuming.
The main drawbacks of this process are that it has to be operated in a vacuum environment and the product is a mixture of

Method used

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  • Process and apparatus for producing metal nanoparticles
  • Process and apparatus for producing metal nanoparticles
  • Process and apparatus for producing metal nanoparticles

Examples

Experimental program
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Effect test

example — 1

EXAMPLE—1

[0073] A reaction vessel for preparation of nanomaterials employing the exploding wire technique was constructed out of glass with an arrangement for mounting a copper metal plate (electrode 1) perpendicular to the base of the reactor. A wire guide arrangement is placed so that a copper wire (electrode 2), while passing through the guide, approaches the plate along its normal. The metal plate and the wire form the two electrodes which is connected to a battery bank allowing for supply of voltages starting at 12 V and going up to 48V in incremental steps of 12 V. The reactor vessel is filled up with a suitable dense medium so as to completely immerse electrode 2 and 66% of electrode 1.

[0074] The batteries were connected so as to have electrode 2 connected to the positive terminal of the battery and electrode 2′ to the negative terminal. Electrode 2′ is brought into contact with electrode 2 to achieve an explosion, following which the current naturally falls to zero. This si...

example — 2

EXAMPLE—2

[0076] A reaction vessel for preparation of nanomaterials employing the exploding wire technique was constructed out of glass with an arrangement for mounting a silver metal plate (electrode 2) perpendicular to the base of the reactor. A wire guide arrangement is placed so that a silver wire (electrode 2′), while passing through the guide, approaches the plate along its normal. The metal plate and the wire form the two electrodes which is connected to a battery bank allowing for supply of voltages starting at 12 V and going up to 48 V in incremental steps of 12 V. The reactor vessel is filled up with a suitable dense medium so as to completely immerse electrode 2 and 66% of electrode 1.

[0077] The batteries were connected so as to have electrode 1 connected to the positive terminal of the battery and electrode 2 to the negative terminal. Electrode 2′ is brought into contact with electrode 2 to achieve an explosion, following which the current naturally falls to zero. This s...

example — 3

EXAMPLE—3

[0080] A reaction vessel for preparation of nanomaterials employing the exploding wire technique was constructed out of glass with an arrangement for mounting an iron metal plate (electrode 2) perpendicular to the base of the reactor. A wire guide arrangement is placed so that an iron wire (electrode 2′), while passing through the guide, approaches the plate along its normal. The metal plate and the wire form the two electrodes which is connected to a battery bank allowing for supply of voltages starting at 12 V and going upto 48 V in incremental steps of 12 V. The reactor vessel is filled up with a suitable dense medium so as to completely immerse electrode 2 and 66% of electrode 1.

[0081] The batteries were connected so as to have electrode 1 connected to the positive terminal of the battery and electrode 2 to the negative terminal. Electrode 2 is brought into contact with electrode 1 to achieve an explosion, following which the current naturally falls to zero. This signa...

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Abstract

A novel process and apparatus for producing metal nanoparticles by electro-explosion of wires is disclosed. The invention comprises placing a wire and a plate of the same material as two electrodes in a dense medium, preferably water, in such a manner so as to guide the wire in a straight line and applying a voltage of greater than 12V to said electrodes to cause the wire explode into nanoparticles.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a novel process for producing metal nanoparticles by electro-explosion of wires. More particularly, the present invention provides a process for the production of nanoparticles comprising exploding wires into small fragments by application of suitable voltages, at low voltages in order to supply energy to the wires such that the nanoparticle size depends upon various controlling parameters such as applied voltages and current densities. The present invention provides a simple, repeatable process to achieve large production volumes for nanoparticles. BACKGROUND OF THE INVENTION [0002] Nanoparticles have been a source of great interest due to their novel electrical, optical, physical, chemical, magnetic etc. properties. They have significant potential for a wide range of applications including catalysis, magnetic recording media, optoelectronic materials, magnetic fluids, composite materials, fuel cells, pigments and senso...

Claims

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Application Information

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IPC IPC(8): B22F9/00B22F1/054B22F9/14
CPCB22F1/0018B22F9/14B82Y30/00B22F1/054B22F1/056
Inventor SEN, PRASENJITGHOSH, JOYEEKUMAR, PRASHANTALQUADAMI, ABDULLAHVANDANA,
Owner JAWAHARLAL NEHRU UNIVERSITY
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