Non-Metallic Nano/Micro Particles Coated with Metal, Process and Applications Thereof

a technology of nano-micro particles and metal, applied in the field of non-metallic nano-micro particles coated with metal, can solve the problems of reducing the economic value of discarded foods, consuming large amounts of food, and consuming large amounts of food, and achieves excellent algaecide and bacteriostatic properties, similar or higher efficiency, and long-term storage

Inactive Publication Date: 2010-02-25
NANOMECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]The particles coated with silver of a preferred embodiment of the present invention have numerous industrial applications such as an anti-ripening agent in the agricultural industry. The silver particles of the preferred embodiment exhibit excellent algaecide and bacteriostatic properties with sustained release activity. It has been found that if silver-coated nano/micro particles are placed in an environment where fruits are ripening, the silver effectively enables the conversion of ethylene to ethylene oxide by a unique mechanism. Thus in a con

Problems solved by technology

Worldwide there is a very significant economic loss in discarded foods due to spoilage.
All of the processes discussed in the above application for preparing silver-coated nanoparticles are tedious and lengthy.
They are also li

Method used

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  • Non-Metallic Nano/Micro Particles Coated with Metal, Process and Applications Thereof
  • Non-Metallic Nano/Micro Particles Coated with Metal, Process and Applications Thereof
  • Non-Metallic Nano/Micro Particles Coated with Metal, Process and Applications Thereof

Examples

Experimental program
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Effect test

example 1

[0030]Step 1: Silver nitrate loading: 100 grams (0.591 gram moles) of silver nitrate is dissolved in demineralized water (1-2 liters) and the silver nitrate solution is subsequently diluted by the addition of 10-12 liters of demineralized water. Nonsurface treated precipitated calcium carbonate (10 kg) is added to the solution with constant stirring to ensure uniform mixing. The mixture is dried in an oven at a temperature below 120° C.

[0031]Step 2: Reduction of silver nitrate coated nano / micro particles using hydrazine hydrate: 50 g of 85% Hydrazine hydrate (1.325 gram mole) is dissolved in demineralized water (1 liter). This was added to the dried silver nitrate loaded calcium carbonate with constant stirring in a sigma mixer and allowed to react for four hours. The mixture was dried at 100-125° C. in an oven to obtain coated silver nano / micro particles with a calcium carbonate core. The particles were slurried in demineralized water, filtered and washed till free of any residual ...

example 2

[0032]Step 1: Silver nitrate loading: 158.8 grams (0.934 gram moles) of silver nitrate is dissolved in demineralized water (1-2 liters) and subsequently diluted by the addition of 100-120 liters of demineralized water. Fumed silica (10 kg) is added to the solution with constant stirring to ensure uniform mixing.

[0033]Step 2: Reduction of silver nitrate nano particles using hydrazine hydrate: 50 g of 85% Hydrazine hydrate (1.325 gram mole) is dissolved in demineralized water (1 liter). Hydrazine hydrate solution is added with constant stirring to the dispersion of example 1 and kept for four hours. The mixture is dried at 50-65° C. in an oven to obtain coated silver nano / micro particles with fumed silica core. The particles are slurried in demineralized water, filtered and washed till free of any residual reducing agent and are used either as wet or as a flush in the required medium. The nano silica particles tend to flocculate if completely dried.

example 3

[0034]15 g Palladium chloride is dissolved in 150 cc 2 N hydrochloric acid and diluted to 100 liters with demineralized water. 10 kg of fumed silica is thoroughly mixed with this solution to allow a very fine layer of palladium chloride to be deposited on the surface of the particles. These are reduced by the addition of 100 g of hydrazine hydrate diluted to 1 liter. The reduced particles appear slightly black in color.

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Abstract

The present invention provides a simple and economical process for preparation of metal-coated non-metallic nano/micro particles. The nano/micro particles are composed of a core and metallic coat over the core using silver or other transition/noble metals. The core of the non-metallic nano/micro particles are selected from inorganic material such as silica, calcium carbonate, barium sulfate, or emulsion grade polyvinyl chloride and other polymers prepared by emulsion process including porous polymers. The metal coating is selected from the transition/noble metals such as copper, nickel, silver, palladium, platinum, osmium, ruthenium, rhodium, and such other metals and their combinations that are easily reducible to elemental metal.

Description

REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims the benefit of the earlier filing date of an Indian provisional patent entitled “Non-metallic nano / micro particles coated with metal and process thereof,” application number 772 / MUM / 2006, filed May 22, 2006, the disclosure of which is incorporated herein by reference.TECHNICAL FIELD OF THE INVENTION[0002]This invention generally relates to non-metallic nano / micro particles coated with metal, particularly to nano / micro particles of silica, barium sulfate, calcium carbonate, solid polymer particles or high-area porous polymeric nano / micro particles coated with silver or other transition / noble metals. The invention also relates to a simple and economical process for preparation and application of the same. This invention also relates to a unique process mechanism enabling applications for a sustainable environment.BACKGROUND[0003]Micro- and nanotechnologies are at the centre of numerous investigations and huge invest...

Claims

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Application Information

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IPC IPC(8): B32B15/04B32B27/04B32B5/02B01J13/02B05D7/00B29C70/00B22F1/00C09K3/00C09C3/06B22F1/18
CPCB22F1/025Y10T428/2993C23C18/1658C23C18/1676C23C18/31C23C18/44B22F2999/00Y10T428/2998Y10T428/2991C08K2201/011C23C18/1662C23C18/1635C08K9/02B22F9/24C08L23/04C08L23/10C08L25/04C08L27/06Y10T428/249921B22F1/18C23C18/1639C23C18/34C23C18/40
Inventor MALSHE, VINOD CHINTAMANIMALSHE, AJAY PRABHAKAR
Owner NANOMECH INC
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