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Temperature controllable switching type nano-filtration membrane and preparation method thereof

A nanofiltration membrane and switch-type technology, which is applied in the field of temperature-controllable switch-type nanofiltration membrane and its preparation, can solve the problems of poor permeability and low functionality of carbon nanotube filter membranes

Active Publication Date: 2017-10-24
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention lies in the poor permeability and low functionality of the carbon nanotube filter membrane prepared by the prior art, and then provides a temperature controllable switch type nanofiltration membrane, which is based on the carbon nanotube array It is prepared by chemical vapor deposition and surface-initiated atomic radical polymerization combined with temperature-sensitive polymer poly N-isopropylacrylamide

Method used

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  • Temperature controllable switching type nano-filtration membrane and preparation method thereof
  • Temperature controllable switching type nano-filtration membrane and preparation method thereof
  • Temperature controllable switching type nano-filtration membrane and preparation method thereof

Examples

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preparation example Construction

[0060] A method for preparing a temperature-controllable switchable nanofiltration membrane, comprising the steps of:

[0061] S1. Depositing a carbon nanotube array on a single crystal silicon wafer, the center line of the carbon nanotube channel is perpendicular to the plane where the single crystal silicon wafer is located;

[0062] S2. Place the monocrystalline silicon wafer with the carbon nanotube array prepared in step S1 in an airtight material so that the airtight material fills the gaps between the carbon nanotubes, and then place it in a vacuum drying oven solidify to form a composite film, and peel the composite film from the single crystal silicon wafer. Since the channel of the carbon nanotube may be sealed by an airtight material, it is necessary to remove the airtight material inside the carbon nanotube, specifically Use ultra-thin microtome to cut off the two ends of the composite film, so that the airtight material or impurities blocked at the end of the carb...

Embodiment 1

[0089] The temperature-controllable switchable nanofiltration membrane provided in this embodiment includes a filter membrane body and a carbon nanotube array that runs through the filter membrane body, the carbon nanotube array includes several carbon nanotubes arranged in parallel, and the carbon nanotubes The tube is grafted with a temperature-sensitive polymer poly-N-isopropylacrylamide material layer, and the temperature-sensitive polymer material layer is in a shrinking or stretching state as the temperature changes, so that the temperature-controllable switch nanofiltration The pore size of the membrane channel changes with temperature. The thickness of the nanofiltration membrane is 10 μm, and the pore diameter of the carbon nanotube is 14-16 nm. When the temperature is 20-40°C, the pore size of the nanofiltration membrane channel changes from small to large as the temperature rises.

[0090] The preparation method of the above-mentioned temperature-controllable switc...

Embodiment 2

[0131] The temperature-controllable switchable nanofiltration membrane provided in this embodiment includes a filter membrane body and a carbon nanotube array that runs through the filter membrane body, the carbon nanotube array includes several carbon nanotubes arranged in parallel, and the carbon nanotubes The tube is grafted with a temperature-sensitive polymer poly-N-isopropylacrylamide material layer, and the temperature-sensitive polymer material layer is in a shrinking or stretching state as the temperature changes, so that the temperature-controllable switch nanofiltration The pore size of the membrane channel changes with temperature. The thickness of the carbon nanotube nanofiltration membrane is 8 μm, and the pore diameter of the carbon nanotube is 14-16 nm. When the temperature is 20-40°C, the pore size of the nanofiltration membrane channel changes from small to large as the temperature rises.

[0132] The preparation method of the above-mentioned temperature con...

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Abstract

The invention relates to a temperature controllable switching type nano-filtration membrane. The temperature controllable switching type nano-filtration membrane comprises a filtration membrane body and a carbon nanotube array which penetrates through the filtration membrane body, wherein the carbon nanotube array comprises a plurality of carbon nanotubes which are arrayed in parallel; the carbon nanotubes are grafted with temperature-sensitive macromolecular polymer material layers; the temperature-sensitive macromolecular polymer material layers are at a contracted or extending state along temperature changes, so that a pore diameter size of a channel of the temperature controllable switching type nano-filtration membrane is changed along the temperature changes; a preparation method comprises the following steps: taking the carbon nanotubes and poly(N-isopropyl acrylamide) as raw materials and preparing the nano-filtration membrane with temperature controllable ions and protein transferring by adopting a chemical vapor deposition method and a surface-initiated atom transfer radical polymerization method; the nano-filtration membrane has good hole permeability and sensitive environment response and can realize controllable transferring and filtering of inorganic ions and proteins under different temperature.

Description

technical field [0001] The invention relates to an intelligent switchable nanofiltration membrane, in particular to a temperature controllable switchable nanofiltration membrane and a preparation method thereof. Background technique [0002] Commonly used filter membranes are mostly polymer composite membranes such as polyvinyl alcohol and cellulose acetate. These polymer filter membranes not only have poorer chemical and mechanical stability than carbon nanotube membranes, but also have defects such as low permeability and poor selectivity. With the application prospects of nanomaterials becoming more and more extensive, the preparation of carbon nanotube films has also attracted the attention of scientists from all over the world. Because carbon nanotubes have good properties such as mechanics, electrical conductivity, heat transfer, optics and hydrogen storage, people are currently mainly studying the application of carbon nanotube films in fields such as field emission, ...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00B01D61/02
CPCB01D61/027B01D67/0079B01D71/78
Inventor 于冰丛海林徐晓丹
Owner QINGDAO UNIV
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