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Asymmetric nanopore composite film and preparation method and application thereof

A technology of nano-channels and composite membranes, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low synthesis yield of block copolymer membranes, poor control ability of etching technology, complicated preparation process, etc. Achieving the effects of abundant raw materials, low prices and overcoming complex processes

Active Publication Date: 2019-06-07
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing membrane materials face problems such as expensive raw materials and complex preparation processes. For example, the synthesis yield of block copolymer membranes is low, and the related organic reactions need to be controlled under strict preparation conditions; the channel etching of inorganic membranes such as molybdenum disulfide The technical requirements are high, and processes such as ion bombardment and focused ion beam are required; polymer films such as PET films have poor etching technology control capabilities and high costs, and a large amount of strong acid and strong alkali will be generated during the etching process Waste liquid, etc.

Method used

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  • Asymmetric nanopore composite film and preparation method and application thereof
  • Asymmetric nanopore composite film and preparation method and application thereof
  • Asymmetric nanopore composite film and preparation method and application thereof

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preparation example Construction

[0045] The silk shells used in the preparation process of the composite membrane provided by the present invention are purchased commercially, which is not limited in the present invention. Here, the present invention provides a preparation method of the above-mentioned silk nanofibers, comprising the following steps:

[0046] (1) silk degumming treatment: 1 part of silk is added to 400 parts of sodium bicarbonate solution with a mass fraction of 0.5%, boiled for 1h, washed with cold water to neutrality, and dried to obtain degummed silk fibers;

[0047] (2) Preparation of silk microfibers: infiltrate 1 part of degummed silk fiber into 30 parts of hexafluoroisopropanol solution, keep it in a constant temperature and airtight manner at 60°C for 24 hours, and let the hexafluoroisopropanol evaporate naturally for 5 hours at normal temperature and pressure to obtain silk microfibers;

[0048] (3) prepare silk nanofiber solution: dissolve 1 part of silk microfiber in 400 parts of wa...

Embodiment 1

[0062] Preparation of Asymmetric Nanoporous Composite Membranes

[0063] like figure 1 As shown, the preparation of the asymmetric nanoporous composite membrane includes the following steps:

[0064] (1) Cut the cocoon into nail-sized pieces, add 1 part of silk into 400 parts of sodium bicarbonate solution with a mass fraction of 0.5%, boil for 1 hour, then wash with cold distilled water until it is neutral, then squeeze the silk to dry, then spread On a piece of clean aluminum foil, let the silk dry overnight at room temperature to obtain degummed silk fibers.

[0065] (2) Then 1 part of degummed silk fiber was soaked into 30 parts of hexafluoroisopropanol solution, fully stirred, and then kept in a constant temperature and airtight at 60 ° C for 24 hours, then moved into a fume hood, and let it be kept under normal temperature and pressure. Hexafluoroisopropanol was naturally evaporated for 5h to obtain silk microfibrils. (3) Dissolve 1 part of silk microfibers in 400 par...

Embodiment 2-5

[0067] Preparation of composite membranes with different silk membrane thicknesses

[0068] Compared with Example 1, by changing the consumption of the silk fiber solution in step (4), it can be obtained that the pore size of the anodic aluminum oxide film is 80-100 nm, the pore size of the silk film is 15-25 nm, and the thickness of the silk film is 5 μm and 15 μm respectively. , 40 μm and 80 μm asymmetric nanoporous composite membranes.

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Abstract

The invention discloses an asymmetric nanopore composite film based on mesoporous-macroporous materials and a preparation method and application thereof. The composite film comprises a silk film layerof a mesoporous structure and a film material of a macroporous structure, wherein the asymmetric nanopore is formed through communication of a part of mesopores in the silk film of a mesoporous structure with a part of macropores in the film material of a macroporous structure. The silk film is adopted as a mesoporous material for the first time, and is used for preparing the asymmetric nanoporecomposite film, and the silk film has stable performance, abundant raw materials, low price, mild preparation conditions and simple operation; in addition, the prepared asymmetric nanopore composite film can be used as a salt difference battery diaphragm in a salt difference power generation system, and has the advantages of long-time current output, application of a wide pH range, stable performance, high conversion efficiency and a wide application range.

Description

technical field [0001] The invention relates to the field of nano-pore composite membranes, in particular to an asymmetric nano-pore composite membrane and a preparation method and application thereof. Background technique [0002] With the continuous consumption of traditional energy sources such as oil, coal mines and natural gas and the rapid growth of energy demand for social development, the exploitation of new renewable and sustainable energy from nature has become the primary means for human beings to solve energy needs. In this context, the salinity difference energy that exists in the waters at the junction of river water and sea water, because of its large reserves, easy access, and wide distribution, is beneficial to a certain extent to alleviate the crisis of energy depletion. To capture this clean energy, researchers have designed numerous energy conversion devices to convert this salt difference energy into electricity. [0003] As one of the most important co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/12B82Y30/00H01M2/14H01M2/16
CPCY02E60/10
Inventor 闻利平辛伟闻孔祥玉江雷
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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