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CN-121988185-A - Composite heterogeneous membrane, preparation method thereof and pressure sensing device

CN121988185ACN 121988185 ACN121988185 ACN 121988185ACN-121988185-A

Abstract

The invention provides a preparation method of a composite heterogeneous membrane, which comprises the steps of firstly dissolving zinc salt, 2-methylimidazole and crown ether in methanol in sequence, stirring to enable the zinc salt and the 2-methylimidazole to carry out coordination reaction to form a zeolite imidazole skeleton, adsorbing the crown ether on the zeolite imidazole skeleton in situ to obtain crown ether modified zeolite imidazole skeleton particles, then adding graphene oxide dispersion liquid into a vacuum filtration system, intercepting the graphene oxide particles in the graphene oxide dispersion liquid by a filtration membrane in the vacuum filtration system under negative pressure to obtain the graphene oxide membrane, adding alcohol solution containing the crown ether modified zeolite imidazole skeleton particles into the vacuum filtration system to enable the crown ether modified zeolite imidazole skeleton particles to be intercepted on the surface of the graphene oxide membrane, and then pouring phenolic resin to fix the crown ether modified zeolite imidazole skeleton particles to obtain the composite heterogeneous membrane. The disclosure also provides a composite heterogeneous membrane obtained according to the aforementioned preparation method and applications thereof.

Inventors

  • ZHANG ZHEN
  • GE JIA
  • WU ZHENHUA
  • Cao xinyue

Assignees

  • 中国科学技术大学苏州高等研究院
  • 中国科学技术大学

Dates

Publication Date
20260508
Application Date
20260109

Claims (10)

  1. 1. A method of preparing a composite heterogeneous membrane comprising: Sequentially dissolving zinc salt, 2-methylimidazole and crown ether in methanol, stirring to enable the zinc salt and the 2-methylimidazole to carry out coordination reaction to form a zeolite imidazole skeleton, and adsorbing the crown ether on the zeolite imidazole skeleton in situ to obtain crown ether modified zeolite imidazole skeleton particles; adding graphene oxide dispersion liquid into a vacuum filtration system, and intercepting graphene oxide particles in the graphene oxide dispersion liquid by a filter membrane in the vacuum filtration system under negative pressure to obtain a graphene oxide membrane; adding an alcohol solution containing the crown ether modified zeolite imidazole skeleton particles into the vacuum filtration system so that the crown ether modified zeolite imidazole skeleton particles are trapped on the surface of the graphene oxide membrane, and then pouring phenolic resin to fix the crown ether modified zeolite imidazole skeleton particles to obtain the composite heterogeneous membrane.
  2. 2. The preparation method according to claim 1, wherein the molar mass ratio of the zinc salt to the 2-methylimidazole is (1:4) - (1:16); The mass of the crown ether is 15% -30% of the total mass of the zinc salt and the 2-methylimidazole.
  3. 3. The preparation method according to claim 1, wherein, The crown ether comprises at least one of benzo 15-crown-5 ether and benzo 18-crown-6 ether; the zeolite imidazole skeleton is zeolite imidazole skeleton-8.
  4. 4. The preparation method according to claim 1, wherein, The stirring speed is 400-500 rpm.
  5. 5. The preparation method according to claim 1, wherein, The pressure in the vacuum filtration system is from-0.08 MPa to-0.09 MPa.
  6. 6. The preparation method according to claim 1, wherein, The phenolic resin was used in an amount of 100mg/ml.
  7. 7. A composite heterogeneous membrane obtained by the preparation method of any one of claims 1 to 6, comprising a graphene oxide membrane and zeolite imidazole framework particles supported on the graphene oxide membrane, wherein the zeolite imidazole framework particles are fixed on the graphene oxide membrane through phenolic resin; wherein, crown ether is modified on the zeolite imidazole skeleton particles.
  8. 8. The composite heterogeneous membrane of claim 6, wherein the mass ratio of the zeolitic imidazolate framework particles to the graphene oxide membrane is 1:2.
  9. 9. The pressure sensing device comprises a pressure sensing unit, an electric signal receiving unit and a signal processing and displaying unit which are electrically connected in sequence, wherein the pressure sensing unit comprises: A pressure sensing membrane which is a composite heterogeneous membrane obtained by the preparation method according to any one of claims 1 to 6; the first electrolyte cavity and the second electrolyte cavity are respectively arranged at two opposite sides of the pressure sensing membrane; the first electrode and the second electrode are respectively arranged in the first electrolyte cavity and the second electrolyte cavity.
  10. 10. The pressure sensing device of claim 9, wherein, The electrolyte comprises an aqueous solution of at least one of sodium salt, potassium salt and lithium salt; the first electrode and the second electrode are silver/silver chloride electrodes.

Description

Composite heterogeneous membrane, preparation method thereof and pressure sensing device Technical Field The disclosure belongs to the field of functional materials, nanofluidic devices and flexible sensing intersection, and particularly relates to a composite heterogeneous membrane, a preparation method thereof and a pressure sensing device. Background The pressure sensing technology is used as a key link of information sensing and plays an increasingly important role in the fields of man-machine interaction, soft robots and the like. Conventional pressure sensors based on piezoresistive or capacitive principles often face serious challenges for long-term stability and reliability due to material degradation or interface interference in complex operating conditions, especially in humid or electrolyte environments. Inspired by the mechanical sensitive ion channel in the organism, the piezoionic sensing technology based on the ion transmission mechanism is generated. The technology directly converts mechanical signals into electric signals by monitoring the transmission behavior of ions regulated and controlled by pressure in the nano-confined space, and provides a brand new paradigm for developing new-generation high-performance pressure sensors. Despite advances in this area, there are still shortcomings in the related art in integrating higher ion selectivity with higher pressure response sensitivity. For example, although the existing compound sensor realizes higher sensitivity (about 5.6 kPa -1), the porous membrane of the existing compound sensor lacks ion selectivity, and is easy to be interfered in a complex ion environment to reduce signal-to-noise ratio and distort signals. Or the frame structure of the composite sensor is fragile, the mechanical property is insufficient, and the composite sensor is difficult to be directly applied to a pressure sensing scene needing to bear mechanical deformation. In addition, the MXene and cellulose nanofiber are compounded to regulate the interlayer distance of the two-dimensional material, so that good linear relation between pressure and current and certain cation selectivity are realized, but the MXene material is easy to swell in a solution environment, has poor structural stability and limits the practical application potential. It can be seen that in the related art, the pressure sensing technology generally presents a situation of unbalanced performance, or focuses on the trade-off of selectivity by pursuing higher sensitivity through a complex microstructure, or focuses on building a precise ion channel, but has difficulty in achieving higher pressure response simultaneously. Therefore, the development of a novel functional material or composite structure which can cooperatively give consideration to higher ion selectivity and higher pressure response sensitivity has profound significance. Disclosure of Invention In view of the above, in order to solve at least one technical problem of the related art and other aspects, the present disclosure provides a method for preparing a composite heterogeneous membrane, including: Sequentially dissolving zinc salt, 2-methylimidazole and crown ether in methanol, stirring to enable the zinc salt and the 2-methylimidazole to carry out coordination reaction to form a zeolite imidazole skeleton, and adsorbing the crown ether on the zeolite imidazole skeleton in situ to obtain crown ether modified zeolite imidazole skeleton particles; Adding graphene oxide dispersion liquid into a vacuum filtration system, and intercepting graphene oxide particles in the graphene oxide dispersion liquid by a filter membrane in the vacuum filtration system under negative pressure to obtain a graphene oxide membrane; adding an alcohol solution containing crown ether modified zeolite imidazole skeleton particles into a vacuum filtration system so that the crown ether modified zeolite imidazole skeleton particles are trapped on the surface of the graphene oxide membrane, and then pouring phenolic resin to fix the crown ether modified zeolite imidazole skeleton particles to obtain the composite heterogeneous membrane. According to the embodiment of the disclosure, the molar mass ratio of the zinc salt to the 2-methylimidazole is (1:4) - (1:16); the mass of the crown ether is 15% -30% of the total mass of the zinc salt and the 2-methylimidazole. According to embodiments of the present disclosure, the crown ethers include at least one of benzo 15-crown-5 ether, benzo 18-crown-6 ether; The zeolite imidazole skeleton is zeolite imidazole skeleton-8. According to the embodiment of the disclosure, the stirring speed is 400-500 rpm. According to embodiments of the present disclosure, the pressure in the vacuum filtration system is from-0.08 MPa to-0.09 MPa. According to embodiments of the present disclosure, the phenolic resin is used in an amount of 100mg/ml. In another aspect of the present disclosure, there is also provided a composite heterogene