Nano particle separation and detection method

A nanoparticle and detection method technology, applied in the direction of particle suspension analysis, measurement device, test sample preparation, etc., can solve the problem of unclear particle size distribution range, etc., and achieve rapid separation, wide separation range and high resolution Effect

Active Publication Date: 2015-07-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although extraction, electrophoresis and chromatographic techniques can separate nanoparticles, they are usually separated for specific nanoparticles, and the size distribution range of particles in the environment cannot be clarified after separation, which has limitations for the separation of different types of nanoparticles in actual water bodies sex

Method used

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  • Nano particle separation and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1: Separation and detection of nano-silver particles

[0058] a. Pretreatment of the aqueous solution containing nano-silver particles

[0059] The pretreatment of the aqueous solution containing nano-silver particles includes two steps of suction filtration and concentration. The water sample was filtered through a 0.45 μm cellulose acetate membrane, and the filtrate was concentrated using a stirring ultrafiltration cup. The ultrafiltration membrane was selected from Millipore 10KD cellulose acetate membrane, and the concentration factor was set to 10 times.

[0060] b, using asymmetric flow field flow separation technology to separate the product obtained in step a

[0061] Obtain the retention time and response signal spectrum of a, b, c three parallel experiments by online UV-vis (such as figure 1 shown), use the ISIS software to set the abscissa t R Convert to R h , get the abscissa as R h , the ordinate is the spectrum of the UV-vis response signal...

Embodiment 2

[0067] Example 2: Nano C 60 separation detection

[0068] a. For nano-C 60 aqueous solution for pretreatment

[0069] Containing nano-C 60 The pretreatment of the aqueous solution includes two steps of suction filtration and concentration. The water sample was filtered through a 0.45 μm cellulose acetate membrane, and the filtrate was concentrated using a stirring ultrafiltration cup. The ultrafiltration membrane was selected from Millipore 10KD cellulose acetate membrane, and the concentration factor was set to 10 times.

[0070] b, using asymmetric flow field flow separation technology to separate the product obtained in step a

[0071] Nano C obtained by online UV-vis 60 Retention time and response signal spectrum of three parallel experiments a, b, c, such as Figure 5 shown.

[0072] Using the ISIS software, the abscissa t R Convert to R h , get the abscissa as R h , the ordinate is the spectrum of the UV-vis response signal, such as Figure 6 shown. The resul...

Embodiment 3

[0079] Embodiment 3: Nano α-Fe 2 o 3 separation detection

[0080] a. For nano α-Fe 2 o 3 aqueous solution for pretreatment

[0081] Containing nano-α-Fe 2 o 3 The pretreatment of the aqueous solution includes two steps of suction filtration and concentration. The water sample was filtered through a 0.45 μm cellulose acetate membrane, and the filtrate was concentrated using a stirring ultrafiltration cup. The ultrafiltration membrane was selected from Millipore 10KD cellulose acetate membrane, and the concentration factor was set to 10 times.

[0082] b, using asymmetric flow field flow separation technology to separate the product obtained in step a

[0083] Nano-sized α-Fe obtained by on-line UV-vis connected with an asymmetric flow long-flow separation system 2 o 3 Retention time and response signal spectrum of three parallel experiments a, b, c (such as Figure 10 shown), use the ISIS software to set the abscissa t R Convert to R h , get the abscissa as R h , ...

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Abstract

The invention discloses a nano particle separation and detection method. The nano particle separation and detection method comprises the following steps: a, pretreating an aqueous solution containing nano particles; b, separating a product obtained from the step a by adopting an asymmetric flow field flow separation technology; and c, determining the concentration of nano particles within different particle diameter ranges, obtained in the step b by separating. According to the invention, the asymmetric flow field flow separation technology is adopted, and is a novel nano particle separation technique. Compared with the traditional separation technique, the asymmetric flow field flow separation technology is mild in separation condition, and a solid phase does not exist in a separation flow channel; the asymmetric flow field flow separation technology is rapid in separation, is high in resolution, and is wide in separation range (1nm-10 microns); the flow phase can be selected from any solvent, and special pretreatment of a sample is not required; a sample is concentrated automatically; detectors, such as UV, MALS and ICP-MS can be connected online.

Description

technical field [0001] The invention relates to a method for separating and detecting particles in water bodies, in particular to a method for separating and detecting nanoparticles in water bodies. Background technique [0002] Nanoparticles refer to crystalline and amorphous solid substances with at least one dimension in the scale of 1-100nm. There are many kinds of nanoparticles in the environment, and the main sources include natural, synthetic and accidental events. With the development of the economy, artificially synthesized nanoparticles account for an increasing proportion of the total nanoparticles in the environment. Emissions from the production and use of artificial nanomaterials, including carbon-based nanoparticles (such as carbon nanotubes, fullerenes, etc.), metal elemental nanoparticles (such as nano-gold, nano-silver (AgNPs), nano-iron, etc.), metal Oxide nanoparticles (such as nano-silver oxide, nano-iron oxide, nano-zinc oxide, nano-titanium dioxide, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06G01N1/28
Inventor 张波何义亮刘雨芳
Owner SHANGHAI JIAO TONG UNIV
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