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A process for synthesising silver nanoparticles

Inactive Publication Date: 2010-09-09
TRINITY COLLEGE DUBLIN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0099]Continuous microfluidic flow synthesis of gold nanoparticles with online optical monitoring has been described however the volume productions are restricted to the order of milliliters per hour. Microfluidic processes of the invention can produce large volumes of high definition silver nanoparticles. The silver nanoparticles pro

Problems solved by technology

However, the quantity of silver nanoparticles produced

Method used

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  • A process for synthesising silver nanoparticles
  • A process for synthesising silver nanoparticles
  • A process for synthesising silver nanoparticles

Examples

Experimental program
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Example

Example 1

Microfluidic Production of Silver Seeds

[0170]We have found that by using microfluidic technologies for the production of silver seeds control over the synthesis of the silver seeds is an important factor in producing discrete high definition silver nanoparticles with predetermined, size, shape and a narrow distribution of size and shape

[0171]FIG. 1 is a schematic illustrating the set up for microfluidic synthesis of silver seeds.

[0172]The constituent chemicals and products may vary from those detailed in FIG. 1 wherein product 1 is a silver nitrate (AgNO3) and Trisodium Citrate (TSC) solution and product 2 is a sodium borohydride (NaBH4) solution. Briefly, referring to FIG. 1, a silver source (in this case silver nitrate) is mixed with trisodium citrate at about 0° C. Following mixing sodium borohydride (NaBH4) is added to the AgNO3-TSC solution and the mixture is incubated at about 0° C.

[0173]In an alternative process, product 1 is a sodium borohydride (NaBH4) and Trisodiu...

Example

Example 2

Protocol for the Production of Silver Seeds Using a Microfluidic Chip System

[0175]Referring to FIGS. 3A and 4, dissolve 37.8 mg of sodium borohydride in 100 ml of water (Solution 1 of FIG. 3A).

[0176]Dissolve 5 mg of silver nitrate and 7.4 mg of trisodium citrate in 100 ml of iced cooled water in an ice bath (solution 2 of FIG. 3A).

[0177]Connect solution 1 and solution 2 to pump 1 and pump 2 respectively (see setup of FIGS. 3A and 4).

[0178]Set pump 1 and pump 2 flow rates for example at 1 ml / min and 8 ml / min respectively;[0179]Run pump 1 for 30 s and collect by-product;

[0180]Run pump 2, while pump 1 is still running and collect by-product for 30 s.

[0181]Collect 5 ml of final seed product, while pump 1 and pump 2 are still running.

[0182]Stop both pump 1 and pump 2.

[0183]A more generic setup for reagent input sequencing for general nanoparticle production is shown in FIG. 5. This setup can be applied to the production method for of a wide range of nanoparticles including high ...

Example

Example 3

Experimental Results for Application of Microfluidics Methods to Silver Seed Production

[0184]The results from experiments using a generic microfluidic chip system for the production of silver seeds (step (a)) are given below. In these cases the second step, (the growth of these seeds to produce discrete high definition silver nanoparticles) was carried out using a conventional batch chemistry method.

[0185]In this example, silver seeds were synthesised using a generic microfluidic chip system according to the following method:

[0186]37.8 mg of sodium borohydride (0.01M) was dissolved in 100 ml of water (solution 1 of FIG. 3A). 5 mg of silver nitrate (2.94×10−4M) and 7.4 mg of trisodium citrate (2.5×10−4M) were dissolved in 100 ml of iced cooled water in an ice bath (solution 2 of FIG. 3A). Solution 1 and solution 2 were connected to pump 1 and pump 2 respectively (as shown in the setup of FIGS. 3A and 4). The flow rate of pump 1 was set at 1 ml / min under a pressure of about 2...

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Abstract

An improved process for synthesising discrete high definition silver nanoparticles in large batch volumes. The method enables the reproducible production of silver nanoparticles having a predetermined size, shape and surface chemistry. The process comprises the steps of forming silver seeds from a reagent comprising, a silver source and a reducing agent; and growing the thus formed silver seeds into silver nanoparticles wherein the step forming silver seeds and/or growing the silver seeds into silver nanoparticles is performed using micro fluidic flow chemistry.

Description

[0001]This invention relates to a process for the production of nanoparticles. In particular the invention relates to a process for the production of large quantities of nanoparticles.[0002]Nanoparticles can be synthesised from a range of materials including dielectric inorganic, organic, polymer and metallic materials. Nanoparticles have been utilised in a number of different fields of technology ranging from paints to biomolecular diagnostics. Over the last few years there has been an increase in the number of uses of nanoparticles, such an increase has resulted in a need to producing nanoparticles in large quantities while maintaining batch reproducibility.[0003]WO 04 / 086044, the entire contents of which is incorporated herein by reference, describes a two-step wet chemistry batch process for synthesising silver seeds and growing the synthesized silver seeds to produce a range of silver nanoparticles. However, the quantity of silver nanoparticles produced by a wet chemistry batch...

Claims

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Application Information

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IPC IPC(8): B22F9/16
CPCB22F9/24B22F2998/00B22F2001/0037B22F2001/0033B22F1/0018B22F1/0553B22F1/0551B22F1/054
Inventor BRENNAN FOURNET, MARGARET ELIZABETHFOURNET, PATRICKAHERNE, DAMIAN JOHNKELLY, JOHN MOFFATLEDWITH, DEIRDRE MARIE
Owner TRINITY COLLEGE DUBLIN
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