Combination of electrostatic spinning and electrostatic spraying for preparing nanofibre base composite separation membrane

A technology of electrostatic spraying and nanofibers, which is applied in electrostatic spraying devices, chemical instruments and methods, fiber treatment, etc., can solve the problems of difficulty in controlling the thickness of the selected layer, difficult promotion and application, etc., and achieves simple and easy preparation methods, Precisely Controlled Effects

Inactive Publication Date: 2011-01-19
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for precise adjustment over the size or shape of an ionic material that separates from other materials like water by controlling how well it forms on its surfaces during manufacturing processes such as filtrations. It also makes possible use across various industries including biomedical applications where specific molecules are separated based upon their properties (such as charge) without affecting them chemistry.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the manufacturing processes of separatory elements like microelectronics devices called MEMS sensors, particularly those involving hydrogen storage batteries. Current methods require expensive equipment and cannot achieve uniform film properties throughout their entirety without sacrificially removing certain layers during chemical vapor deposition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 24 g of polyethersulfone (PES) was dissolved in 76 g of N,N-dimethylformacetamide (DMAC) solvent to obtain a transparent and uniform electrospinning solution;

[0025] (2) Dissolve 4.0 g of polyvinylidene fluoride (PVDF) in 92 g of a mixed solvent of N,N-dimethylformamide (DMF) / acetone, N-dimethylformamide (DMF) / acetone=2 / 8. Obtain a transparent and uniform electrostatic spray solution;

[0026](3) Add the electrospinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump, the nozzle is connected to a high-voltage positive electrode, the electrospinning parameters are controlled at a voltage of 16kv, the nozzle aperture is 0.5mm, and the solution flow rate is 30μl / min. The ambient temperature is 25°C, the relative air humidity is 75%, and electrospinning is performed. The average diameter of the obtained PES electrospun nanofibers is 1.2 μm, the deposition thickness is 500 μm, and the porosity is 72%;

[0027] (4) Add...

Embodiment 2

[0033] (1) 19.0 g of polysulfone (PSU) was dissolved in 81 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrospinning solution;

[0034] (2) 7.0 g of polyvinyl alcohol (PVA) was dissolved in 93 g of deionized water to obtain a transparent and uniform electrostatic spray solution;

[0035] (3) Add the electrospinning stock solution in (1) into the container, and extrude it under the control of a micro-injection pump. Electrospinning was carried out at 55°C, and the obtained PSU electrospun nanofibers had an average diameter of 2 μm, a deposition thickness of 250 μm, and a porosity of 86%;

[0036] (4) Add the electrostatic spray stock solution in (2) into the container, and extrude under the control of a micro-injection pump. The nozzle is connected to a high-voltage positive electrode. The electrospinning parameters are controlled at a voltage of 45kv, the nozzle aperture is 0.05mm, the solution flow rate is 8μl / mln, and the ambient temperatur...

Embodiment 3

[0040] (1) 13.0 g of polyacrylonitrile (PAN) was dissolved in 87 g of N,N-dimethylacetamide (DMAC) solvent to obtain a transparent and uniform electrospinning solution;

[0041] (2) Dissolving 12.0 g of polyamic acid in 88 g of N,N-dimethylformamide (DMF) solvent to obtain a transparent and uniform electrostatic spray solution;

[0042] (3) Add the spinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. 25°C, electrospinning, the average diameter of the obtained PAN electrospun nanofibers is 500nm, the deposition thickness is 70μm, and the porosity is 92%;

[0043] (4) Add the electrostatic spray stock solution in (2) into the container, and extrude under the control of a micro-injection pump. The nozzle is connected to a high-voltage positive electrode. The electrostatic spray parameters are controlled at a voltage of 12kv, the nozzle aperture is 0.8mm, the solution flow rate is 5μl / min, and the ambient temperature 15°C, 25...

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Abstract

The invention relates to a combination of electrostatic spinning and electrostatic spraying for preparing a nanofibre base composite separation membrane, comprising: dissolving functional polymer film material in solvent; preparing into polymer spinning solution A for electrostatic spinning, and obtaining non-woven fabrics to serve as the support layer of a composite membrane; dissolving another functional polymer film material in the solvent; preparing into polymer spinning solution B, and spraying the polymer spinning solution B on the surface of the non-woven fabrics by electrostatic spraying to serve as the selecting layer of the composite membrane; carrying out heat treatment or chemical treatment on the above product; and preparing the nanofibre base composite separation membrane. The preparation method provided by the invention is simple and easy to realize, can conveniently and accurately control the thickness and the evenness of the surface selecting layer, and is easy to realize the operation of large-scale production; the prepared nanofibre base composite separation membrane can be widely applied in the fields of microfiltration, ultrafiltration, reverse osmosis and the like.

Description

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Claims

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Application Information

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Owner DONGHUA UNIV
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