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Sample preparation method for ToF-SIMS test of hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of ToF-SIMS test sample preparation, can solve the problems of ion beam ineffective focus, poor test signal, large enough elevation difference, etc., to achieve low sample preparation cost, simple operation, and smooth process short effect

Inactive Publication Date: 2021-03-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the ToF-SIMS test for ultrafiltration membranes can only be limited to flat-plate membranes. For hollow fiber membranes, due to their cylindrical shape and small diameter, direct ToF-SIMS tests cannot form a small enough elevation difference. And the size of the plane is large enough, the primary ion beam cannot be effectively focused, and the test signal is very poor

Method used

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  • Sample preparation method for ToF-SIMS test of hollow fiber membrane
  • Sample preparation method for ToF-SIMS test of hollow fiber membrane
  • Sample preparation method for ToF-SIMS test of hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this example, the hollow fiber membrane polluted by humic acid (HA) is taken as an example. The material of the hollow fiber membrane is polyvinylidene fluoride (PVDF), the outer diameter is about 1.3 mm, and the membrane surface is covered with a filter cake layer with a thickness of about 20 μm. , the composition of the filter cake layer is HA, and the ToF-SIMS test is performed on the filter cake layer on the surface of the hollow fiber membrane.

[0053] A kind of sample preparation method flow chart of hollow fiber membrane ToF-SIMS test is as follows figure 1 shown, including the following steps:

[0054] After the hollow fiber membrane was air-dried at room temperature, the HA-contaminated hollow fiber membrane with a length of 1 cm was cut, cut from one side along its axial direction, flattened with tweezers, and pasted on a glass slide with the same size as the expanded one.

[0055] The stainless steel mold is pre-cooled to -20° C., and the stainless steel...

Embodiment 2

[0064] In this embodiment, a clean hollow fiber membrane is taken as an example, the material is polyvinylidene fluoride (PVDF), the outer diameter is about 1.3mm, and the ToF-SIMS test is carried out on the membrane material in the direction of the surface of the hollow fiber membrane.

[0065] A kind of sample preparation method flow chart of hollow fiber membrane ToF-SIMS test is as follows figure 1 shown, including the following steps:

[0066] After the hollow fiber membrane is naturally air-dried at room temperature, cut the hollow fiber membrane filament with a length of 1 cm, cut it from one side along its axial direction, flatten it with tweezers, and paste it on a glass sheet with the same unfolded size.

[0067] The stainless steel mold is pre-cooled to -20° C., and the stainless steel mold is 2.4 cm long, 1.8 cm wide, and 0.8 cm thick. Take out the pre-cooled stainless steel mold, press the hollow fiber membrane flattened on the glass sheet to the bottom of the mo...

Embodiment 3

[0071] In this example, the hollow fiber membrane polluted by humic acid (HA) is taken as an example. The material of the hollow fiber membrane is polyvinylidene fluoride (PVDF), the outer diameter is about 1.3 mm, and the membrane surface is covered with a filter cake layer with a thickness of about 20 μm. , the composition of the filter cake layer is HA, and the ToF-SIMS test is performed on the filter cake layer on the surface of the hollow fiber membrane.

[0072] A kind of sample preparation method flow chart of hollow fiber membrane ToF-SIMS test is as follows figure 1 shown, including the following steps:

[0073] After the hollow fiber membrane was air-dried at room temperature, the HA-contaminated hollow fiber membrane with a length of 1 cm was cut, cut from one side along its axial direction, flattened with tweezers, and pasted on a glass slide with the same size as the expanded one.

[0074] Pour the molten paraffin liquid into the stainless steel mold, the stainle...

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Abstract

The invention provides a sample preparation method for ToF-SIMS test of a hollow fiber membrane, and belongs to the technical field of ToF-SIMS test. The method comprises the following steps: cuttinga hollow fiber membrane along the axial direction, flattening and pasting the hollow fiber membrane on a glass sheet, and expanding a to-be-tested surface by adopting a paraffin block. According to the method, the problem that the result is not credible due to the fact that the diameter of the hollow fiber membrane is too small, ToFSIMS cannot be effectively focused and the test signal is too pooris solved, the accurate and credible ToFSIMS test of the hollow fiber membrane is successfully achieved, the good test signal is obtained, operation is easy, and the method can be used for hollow fiber membrane surface filter cake layer composition analysis, membrane material composition analysis and the like.

Description

technical field [0001] The invention belongs to the technical field of ToF-SIMS test sample preparation, and in particular relates to a sample preparation method for hollow fiber membrane ToF-SIMS test. Background technique [0002] Time-of-flight-secondary ion mass spectrometry (ToF-SIMS) is a very sensitive analytical technique for the chemical composition of solid surfaces. ), high sensitivity, high depth resolution (2-3 atomic layers), small analysis area and no damage to samples. At present, ToF-SIMS is widely used in semiconductor material analysis, cytochemical imaging, organic material analysis and other fields. For the field of membrane water treatment, ToF-SIMS can also play a huge role. ToF-SIMS can be used to characterize the chemical composition of the surface of the membrane material, and can also test the filter cake layer on the membrane surface, realize the depth distribution analysis of different pollutants in the filter cake layer, analyze the three-dime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2202G01N23/2258
CPCG01N23/2202G01N23/2258
Inventor 曲久辉吴思琦马百文胡承志
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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