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Size and charge selective filtering membrane material and preparation method and application thereof

A filter membrane and negative charge technology, applied in the field of separation, can solve the problems of difficult size classification and difficult to obtain filter membranes, and achieve the effects of stable pore size, elimination of pore unevenness, and convenient use.

Inactive Publication Date: 2021-04-30
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Size fractionation is often difficult to achieve efficiently with centrifugation
The use of filtration technology requires that the pores of the filter membrane can be controlled more accurately and have good stability, and such a filter membrane is currently difficult to obtain

Method used

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  • Size and charge selective filtering membrane material and preparation method and application thereof
  • Size and charge selective filtering membrane material and preparation method and application thereof
  • Size and charge selective filtering membrane material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Particle filtration membranes use the gap size between particles as a size screening tool. Size selection principle such as figure 1 shown.

[0028] (1) Preparation of emulsion-based particles. The emulsifier is sodium dodecylbenzenesulfonate / OP-10 (1:2), the dosage is 5% of the mass of the monomer, dissolved in water (water is 4 times the mass of the monomer), and the pH is adjusted to be neutral. Ammonium persulfate (0.6% on monomer level) was added. The oil phase is a dispersed phase, composed of monomer styrene, divinylbenzene, methacrylic acid and glyceryl methacrylate (4% methacrylic acid, 10% glyceryl methacrylate). With vigorous stirring, drop the oil phase into the water phase to form an emulsion. The emulsion was heated at 75-80°C for 8 hours. Collect by centrifugation, add water to shake to disperse, collect by centrifugation, repeat 5 times.

[0029] (2) Amino functionalization of particle surface. Take emulsion particles (1 g), put into branched poly...

Embodiment 2

[0033] comparison test

[0034] In embodiment 1 step (4), when with citric acid replace PEI@PEG When synthesizing gold nanoparticles, although the gold nanoparticles are also below 35 nanometers, there is no red color characteristic of gold nanoparticles in the filter membrane filtrate, indicating that the particles cannot pass through the filter membrane. The reason is that the gold nano-acid passivated by citric acid is acidic, while the surface of the filter membrane is alkaline, and the electrostatic adsorption of acid and alkali makes it impossible to pass through the filter membrane.

Embodiment 3

[0036] In step (2) of Example 1, when the size of the emulsion-based particles is increased to 1 micron, that is, when the particle size obtained by centrifugation is increased from 230 nanometers to 1 micron, a filter membrane is also prepared. The membrane is used to filter the silver nanoparticles (tens of nanometer discrete particles to five hundred nanometer aggregates) regulated and synthesized by PEI@PEG, and the diameter of the obtained silver particles is less than 150 nanometers. In this way, the present invention controls the porosity of the filter membrane by selecting the size of the emulsion-based particles, and realizes on-demand design.

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Abstract

The invention discloses a size and charge selective filtering membrane material and a preparation method and application thereof, and belongs to the technical field of separation. According to the typical preparation method, amino functionalization is carried out on outer surfaces polymer spherical particles with uniform sizes obtained in any mode, and then particle tiling stacking and cross-linking are carried out. The multilayer particles are stacked and crosslinked to form a filter membrane, the permeation size of the membrane is determined by gaps among the spheres, and the smaller the spheres are, the smaller the permeation size is. Meanwhile, the charge of the filter membrane also determines the charge penetrability of the filtered material, and the electrically neutral particles or the particles with the same charge as the filter membrane can pass through the filter membrane. Particles forming the membrane show flexibility due to a swelling state, so that the membrane has relatively strong adaptability.

Description

technical field [0001] The invention belongs to the technical field of separation, and in particular relates to a particle size / charge selective filter material, a preparation method thereof and an application in nano particle size classification. Background technique [0002] Granular materials with sizes ranging from a few nanometers to tens of nanometers have a wide range of application backgrounds. These applications are often closely related to size and dimensional uniformity. For example, cadmium selenide nanomaterials as marking materials must have a highly uniform size in order to obtain monochromaticity; the fluorescence color is closely related to the size. Size fractionation is often difficult to effectively achieve using centrifugation. The use of filtration technology requires that the pores of the filter membrane can be controlled more accurately and have good stability, and such a filter membrane is currently difficult to obtain. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D61/00
CPCB01D69/02B01D67/0006B01D61/00B01D2325/02
Inventor 万德成金明
Owner TONGJI UNIV