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Janus fabric with one-way droplet permeability and preparation method of Janus fabric

A unidirectional penetration, droplet technology, applied in the direction of repelling fibers, plant fibers, textiles and papermaking, etc., can solve the problem that Janus materials are difficult to achieve directional water droplet transmission, and the thickness of modified hydrophilic or hydrophobic layers is uncontrollable. , difficult operating conditions, etc., to avoid delamination and peeling, good porosity, and high controllability

Active Publication Date: 2021-10-29
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most chemical asymmetric modification methods have problems such as cumbersome and complicated processes, toxic solvents, expensive reagents, and difficult to control operating conditions, and the wicking phenomenon of porous membranes due to capillary action during the wet chemical modification process makes the modified hydrophilic Layer or hydrophobic layer thickness is uncontrollable, making it difficult for Janus materials to achieve directional water droplet transport function

Method used

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  • Janus fabric with one-way droplet permeability and preparation method of Janus fabric
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  • Janus fabric with one-way droplet permeability and preparation method of Janus fabric

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preparation example Construction

[0029] A preparation method of a Janus fabric with droplet unidirectional permeability, comprising the steps of:

[0030] 1) Add TEOS and an appropriate amount of silane coupling agent to ethanol, stir for 10 minutes, then add a mixed solution of ammonia water and ethanol to it, and seal the reaction at room temperature; centrifuge the product, and wash it repeatedly with ethanol to obtain M-SiO 2 , and then disperse it in ethanol with a high-power ultrasonic breaker to prepare a uniform M-SiO 2 Dispersion liquid, ready to use;

[0031] 2) Fix the cotton fabric at the bottom of the container filled with deionized water, and slowly add M-SiO to the water surface 2 Dispersion, M-SiO 2 Diffusion at the water / air interface to form complete M-SiO 2 When the film is thin, stop the dripping; insert one of the hydrophilic porous sponge, paper towel or cotton into the M-SiO 2 The interface between the film and the container wall, M-SiO 2 The film moves rapidly in the direction opp...

Embodiment 1

[0042] Add 3mL TEOS and 0.761g trimethoxy(1H,1H,2H,2H-heptadecafluorodecyl)silane into 100mL ethanol, stir for 10min, then add 7.5mL ammonia water and 100mL ethanol mixed solution, seal the reaction at room temperature 12h; the product was centrifuged and washed several times with ethanol to obtain M-SiO 2 , and then disperse it in ethanol with a high-power ultrasonic breaker, ultrasonic for 20min, and prepare M-SiO with a volume concentration of 5mg / mL 2 Dispersion liquid, ready for use; fix the cotton fabric at the bottom of the container filled with deionized water, and slowly add M-SiO2 to the water surface 2 Dispersion, M-SiO 2 Diffusion at the water / air interface to form complete M-SiO 2 When the film is thin, stop dropping; insert a hydrophilic paper towel into the M-SiO 2 The interface between the film and the container wall, M-SiO 2 The film moves quickly in the direction opposite to the water absorption of the paper towel to realize automatic extrusion, forming a...

Embodiment 2

[0049] Add 3mL of TEOS and 0.684g of tridecafluorooctyltriethoxysilane into 100mL of ethanol, stir for 10min, then add a mixed solution of 7.5mL of ammonia water and 100mL of ethanol, and seal the reaction at room temperature for 12h; centrifuge the product and wash with ethanol Repeated washing several times to obtain M-SiO 2 , and then disperse it in ethanol with a high-power ultrasonic breaker, ultrasonic for 20min, and prepare M-SiO with a volume concentration of 3mg / mL 2 Dispersion liquid, ready for use; fix the cotton fabric at the bottom of the container filled with deionized water, and slowly add M-SiO2 to the water surface 2 Dispersion, M-SiO 2 Diffusion at the water / air interface to form complete M-SiO 2 When the film is thin, stop dropping; insert the porous sponge into the M-SiO 2 The interface between the film and the container wall, M-SiO 2 The film moves rapidly in the direction opposite to the water absorption of the sponge to realize automatic extrusion, f...

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Abstract

The invention relates to the field of functionalized Janus materials, in particular to a preparation method of a Janus fabric with one-way droplet permeability. The method comprises the following steps of synthesizing hydrophobic silicon dioxide nanoparticles (M-SiO2) by sol-gel reaction of tetraethoxysilane (TEOS) and a silane coupling agent; putting a super-hydrophilic cotton fabric into water, dropwise adding a proper amount of an M-SiO2 ethanol solution into the water surface, and forming an M-SiO2 self-assembled film on an air-water interface by combining a Margangoni effect and capillary force driven compression; and volatilizing the water by heating, and depositing the M-SiO2 film on the surface of the cotton fabric fiber to form the Janus fabric. The method is simple and pollution-free, the cost is low, the controllability is high, and the method is suitable for industrial production, popularization and application. The fabric prepared by the method has asymmetric wettability, one side presents high hydrophobicity with a water contact angle of more than 120 degrees, the other side presents super hydrophilicity with a water contact angle of 0 degree, the Janus fabric can realize one-way permeation of water drops in air, transmembrane time is 2.4-10.5 s, and the fabric can be used as a one-way moisture-conducting or moisture-absorbing and sweat-releasing material, and can also be used in the fields of oil-water separation, mist collection, microfluidics and the like.

Description

technical field [0001] The invention relates to the field of functionalized Janus materials, in particular to a Janus fabric with droplet unidirectional permeability and a preparation method thereof. Background technique [0002] Janus material refers to the material with opposite extreme wettability on both sides. Its hydrophilic / phobic heterogeneous interface structure allows water droplets to permeate in a specific direction but not in the opposite direction of the specific direction. / Separation, analytical testing, biomedical and other fields have great value. At present, Janus materials are mainly prepared by two methods: "layer-layer" asymmetric compounding and chemical asymmetric modification. The "layer-layer" asymmetric compounding method refers to the combination of two materials with different wettability to form a film. Sequential electrospinning, filtration, spraying, etc. are realized. The process is simple and the thickness of the hydrophilic / phobic layer i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79D06M23/16D06M101/06
CPCD06M11/79D06M23/16D06M2200/12D06M2101/06
Inventor 苏晓竞吴文剑李坤泉谢华理陈静宜
Owner DONGGUAN UNIV OF TECH