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Method for measuring concentration of C60 nanocrystal particles in water medium

A technology of nano crystal particles and concentration measurement, which is applied in the field of nanomaterials and can solve problems such as emulsification, concentration measurement will be affected, and foam will be generated.

Inactive Publication Date: 2013-02-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changes in the physical and chemical properties of C60 nanocrystalline particles will affect its concentration measurement, which will easily cause emulsification during the measurement process and foam during destabilization and agitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Containing the preparation of the C60 nano crystal particle aqueous suspension of sodium dodecyl sulfate (SDS), comprises the following steps:

[0056] 1, SDS is added in the C60 nanocrystal particle aqueous suspension, wherein C60 concentration is 5mg / L, and the concentration of SDS is 20g / L (above its critical micelle concentration).

[0057] II. Stirring on a magnetic stirrer for 24 hours at 25° C. to prepare an aqueous suspension of C60 nanocrystal particles containing SDS.

[0058] Utilize GAA as destabilizing agent, measure in the nC60 water suspension that contains SDS, the recovery rate of C60 in the concentration determination comprises the following steps:

[0059] A. In 4ml of nC60 aqueous suspension containing SDS, add 12ml of pure GAA to destabilize.

[0060] B. Add 4 mL of toluene to the destabilized water suspension, and extract C60 in the destabilized water suspension.

[0061] C, stirred for 6 hours at a rotating speed of 1750 rev / min.

[0062] D. Pu...

Embodiment 2

[0068] The preparation of the C60 nano crystal particle aqueous suspension that contains cetyltrimethylammonium bromide (CTAB) may further comprise the steps:

[0069] 1, CTAB is added in the C60 nanocrystal particle aqueous suspension, wherein C60 concentration is 5mg / L, and the concentration of CTAB is respectively 4g / L (above its critical micelle concentration).

[0070] II. Stirring on a magnetic stirrer for 24 hours under the condition of 25° C., the aqueous suspension of C60 nanocrystal particles containing CTAB was prepared.

[0071] Utilize GAA as destabilizing agent, measure in the nC60 aqueous suspension that contains CTAB, the recovery rate of C60 in the concentration determination comprises the following steps:

[0072] A. In 4ml of nC60 aqueous suspension containing CTAB, add 12ml of pure GAA to destabilize.

[0073] B. Add 4 mL of toluene to the destabilized water suspension, and extract C60 in the destabilized water suspension.

[0074] C, stirred for 6 hours ...

Embodiment 3

[0081] The preparation of the C60 nano crystal particle aqueous suspension containing polyoxyethylene ether type nonionic surfactant (TX100) may further comprise the steps:

[0082] 1. TX100 is added to the C60 nanocrystal particle aqueous suspension, wherein the concentration of C60 is 5mg / L, and the concentration of TX100 is 50g / L (above its critical micelle concentration).

[0083] II. Stirring on a magnetic stirrer for 24 hours under the condition of 25° C., respectively prepared aqueous suspensions of C60 nanocrystal particles containing TX100.

[0084] Utilize GAA as destabilizing agent, measure in the nC60 aqueous suspension that contains TX100, the recovery rate of C60 in the concentration determination comprises the following steps:

[0085] A. Add 12ml of pure GAA to 4ml of nC60 aqueous suspension containing TX100 for destabilization.

[0086] B. Add 4 mL of toluene to the destabilized water suspension, and extract C60 in the destabilized water suspension.

[0087]...

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Abstract

The invention discloses a method for measuring the concentration of C60 nanocrystal particles in water medium. The method comprises the following steps: pure glacial acetic acid is added into nC60 water suspension which contains a surface active agent to destabilize; toluene is used to extract C60 in the destabilized water suspension; the water suspension is stirred; the water suspension is frozen and stirred; then, an ultraviolet-visible spectrophotometer is used to measure the absorbance of the upper layer of toluene solution of the frozen water suspension; the concentration of C60 in a sample is calculated according to a standard curve through the absorbance; and the rate of the C60 concentration which is obtained through calculating to the standard C60 concentration is used as the recovery rate of the C60 concentration measurement. According to the method, the glacial acetic acid is used as a destabilizing agent to eliminate the phenomenon that emulsification and foams are generated during the C60 concentration measurement process under the condition of containing the surface active agent, so that the C60 concentration measurement can be enabled to be normally carried out, and moreover, the higher C60 recovery rate can be obtained.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for improving the destabilization efficiency of nC60 in the process of measuring the concentration of C60 nano crystal particles in water medium. Background technique [0002] C60 is the third allotrope of carbon and is a member of the fullerene family. The unique structure of C60 makes it widely used in the fields of electronics, optics and medicine [1-5]. Due to the wide application of C60, it can be released into the aquatic environment through point or non-point sources, such as production plants, landfills, atmospheric deposition, storm runoff, cosmetics containing nanomaterials and nanopesticides discharged by consumers Wait. The cumulative concentration of C60 in the water body environment will gradually increase with the gradual increase of the market, the gradual reduction of its production costs and the continuous research and development of new products [6]. If...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 张波何义亮于叶
Owner SHANGHAI JIAO TONG UNIV
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