Nuclear pore filter membrane with compound pore passage and preparation method of nuclear pore filter membrane

Abstract

The invention relates to a preparation method of a nuclear pore filter membrane and particularly relates to a nuclear pore filter membrane with a pore passage structure combined by a cone-shaped pore passage and a columnar pore passage. A preparation method of the nuclear pore filter membrane with tthe compound pore passage structure mainly comprises the following steps: radiating a polymer film by virtue of high-energy heavy ions, so as to form a latent trace; respectively etching the same surface of the radiated polymer film by virtue of two etching solutions with different track etching speeds, so as to form the novel cone / column compound pore passage structure. The cone / column compound pore passage structure has the obvious structural characteristics that the pore passage is formed by the linkage of an upper part and a lower part, and specifically comprises the cone-shaped pore passage and the columnar pore passage; the columnar pore passage is etched and machined by virtue of liquid with high track etching speed; the cone-shaped pore passage is etched and machined by virtue of liquid with the lower track etching speed. By utilizing the novel pore passage design, the technical problem of low filtration flux of the small-aperture nuclear pore filter membrane can be beneficially solved, and the technical problems of single-layer filtration and repeated cleaning are further beneficially solved.

Description

technical field [0001] The invention relates to a method for preparing a nuclear pore filter, in particular to a nuclear pore filter whose pore structure is composed of conical and cylindrical pore channels. The cone / column composite pore nuclear pore filter membrane prepared by this method can be applied to filter membrane industries such as medical filtration, food packaging, electronic product protection, and battery diaphragms. Background technique [0002] Nuclear pore filter is a new type of filter membrane. It is formed by using heavy ions to drill holes on the insulating material film and then expanding the holes by chemical etching. The size of the holes is controlled by changing the concentration of the etching solution, temperature and etching time. Compared with conventional filter membranes, nuclear pore membrane products have the advantages of regular pore shape, controllable pore size and uniform pore size. [0003] In the international market, nuclear pore ...

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Problems solved by technology

However, the general tapered hole cannot make a large taper

Because the taper is too large, for a nuclear pore filter membrane of a certain thickness, the conduction may not be possible when the pore size is small.

Second, the inner hole diameter cannot be controlled

The one-time etching process of tapered holes needs to solve the two goals of surface hole expansion and inner hole formation at the same time, but the two processes affect each other, and the formation of inner holes requires the conduction of the outer holes before starting

However, the conduction of the outer hole is greatly affected by the unevenness of the film thickness, so that the control of the inner hole cannot be realized.

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