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Preparation method of filter membrane section sample

A filter membrane and cross-section technology, applied in the field of sample preparation, can solve problems such as uneven incision and damage to the pore structure, and achieve the effect of easy operation and smooth cross-section of the filter membrane.

Pending Publication Date: 2021-11-23
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a filter membrane cross-section sample and its preparation method in order to overcome the problems of uneven cut and damaged pore structure in the preparation of existing filter membrane cross-section samples.

Method used

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  • Preparation method of filter membrane section sample
  • Preparation method of filter membrane section sample
  • Preparation method of filter membrane section sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take the filter membrane, the filter membrane is an ultrafiltration membrane, the functional layer is polyethersulfone (PES), the support layer is a non-woven fabric (PE), and the aperture is 2-100nm. After immersing in ultrapure water for 0.5h, wait for frozen section When the temperature of the cooling chamber drops below -20°C, the temperature of the cold head drops below -30°C, the temperature of the cold knife drops below -20°C, and the temperature of the cold table drops below -35°C, the filter membrane is fixed with a mold Put it on the sample stage in the freezing chamber of the cryostat, and the filter membrane extends in a straight line and is perpendicular to the plane of the sample stage. Add water to the mold so that the water does not pass through the filter membrane, and then lower the temperature so that the filter membrane and water freeze and solidify together, then remove the mold, so that the filter membrane is vertically frozen on the sample stage, a...

Embodiment 2

[0051] Get the filter membrane, the filter membrane is a microfiltration membrane, the functional layer is polyvinylidene fluoride (PVDF), the support layer is non-woven fabric (PE), and the aperture is 0.1-1 μm. After soaking in ultrapure water for 0.5h, wait for When the temperature of the cold chamber of the frozen microtome drops below -20°C, the temperature of the cold head drops below -30°C, the temperature of the cold knife drops below -20°C, and the temperature of the cold table drops below -35°C, the filter The membrane is fixedly placed on the sample stage in the freezer chamber of the cryostat, and the filter membrane extends in a straight line and is perpendicular to the plane of the sample stage. Add water to the mold so that the water does not pass through the filter membrane, and then lower the temperature so that the filter membrane and water freeze and solidify together, then remove the mold, so that the filter membrane is vertically frozen on the sample stage,...

Embodiment 3

[0056] Take the filter membrane, the filter membrane is a microfiltration membrane deposited on the surface to filter pollutants, the functional layer is polyvinylidene fluoride (PVDF), the support layer is non-woven fabric (PE), and the pore size is 0.1-1 μm. After soaking for 0.5h, when the temperature of the cold chamber of the frozen microtome drops below -20°C, the temperature of the cold head drops below -30°C, the temperature of the cold knife drops below -20°C, and the temperature of the cold table drops below -35°C, The filter membrane is fixed and placed on the sample stage in the freezer chamber of the cryostat with a mould, and the filter membrane extends in a straight line and is perpendicular to the plane of the sample stage. Add water to the mold so that the water does not pass through the filter membrane, and then lower the temperature so that the filter membrane and water freeze and solidify together, then remove the mold, so that the filter membrane is vertica...

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Abstract

The invention relates to a preparation method of a filter membrane section sample. The preparation method comprises the following steps: obtaining a water-soaked filter membrane, vertically putting the filter membrane into a specific mold, adding water to submerge the filter membrane, then cooling in a freezing chamber of a freezing slicer to freeze and solidify the filter membrane and the water together, cutting the filter membrane by using the slicer, and drying to obtain a filter membrane section sample. The section of the filter membrane section sample obtained by the method is flat, the pore channel structure of the section is kept intact relative to the original filter membrane, and the substance distribution in the filter membrane is kept consistent with that of the original filter membrane.

Description

technical field [0001] The invention relates to the technical field of sample preparation, in particular to a method for preparing a section sample of a filter membrane. Background technique [0002] Filter membranes are used to separate and concentrate solutes in solutions, and are also commonly used for the separation of colloidal suspensions, and their application fields are constantly expanding. The filter membrane has pores, which are classified according to the size of the pores, and are divided into microfiltration membranes, ultrafiltration membranes, nanofiltration membranes and reverse osmosis membranes from coarse to fine. Microfiltration membranes, ultrafiltration membranes, nanofiltration membranes and reverse osmosis membranes generally include two layers in structure: the upper layer is a functional layer, mostly polymer materials, which have the functions of dense micropores and intercepting particles or macromolecules; The supporting layer of the large thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/42
CPCG01N1/286G01N1/42G01N2001/2873
Inventor 任红云张娴张子兴张丹丹黄福义
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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