| The development of smart textiles has increasingly higher requirements on their comfort.Among them,moisture management plays a vital role in improving the comfort of smart textiles and has attracted widespread attention.At present,the design principles of unidirectional wet fabrics at home and abroad mostly use the differential capillary effect to make sweat be absorbed from the inside to the outside of the fabric,so as to achieve the effect of moisture absorption and perspiration.However,its moisture conduction process is passive,and it is impossible to perform clear and controllable operations on the moisture conduction process and flux,so its application in smart clothing has certain limitations.Therefore,cross-disciplinary application has become a requirement for the further development of smart textiles.This topic introduces a novel theory of moisture conductivity:electroosmosis,using a textile-based electrode layer to self-assemble an electroosmotic pump.Based on the principle of a microfluidic two-electron layer in a nanoporous membrane microchannel,under the drive of low voltage?1 V?12 V?,the transmission of water is driven and controlled by electroosmotic flow.The main research contents are as follows:1.In order to solve the problem of fabric conductivity and it can be used as an electrode for electroosmotic pumps,using PEDOT:PSS as the functional finishing agent and water-soluble polyurethane?WPU?as the binding material,the two solutions are mixed according to 4:1,and then a uniform conductive layer is formed on the surface of each fiber of the cotton non-woven fabric by high-pressure spraying technology.?The surface conductivity of the fabric after 10 high-pressure sprays was 50?60?/cm2?,and a PEDOT:PSS modified cotton non-woven fabric was obtained.Subsequently,the prepared textile-based PEDOT:PSS electrode and the track-etched polycarbonate film?PC film?were prepared by thermocompression bonding technology through a layer-by-layer assembly method.The material has a good water-conducting effect.Mass flux is 2.76mg?min-1?cm-2?V-1?drive voltage 9 V?12 V?.2.In order to further improve the conductivity of the fabric and the prepared electroosmotic pump has a higher moisture flux,using graphene?0.1 g/mL?as a functional finishing agent,a uniform conductive layer is formed on the surface of each fiber of pure cotton non-woven fabric by high-pressure spraying?the electrical conductivity of the fabric surface after 10 high-pressure spraying is 10?15?/cm2?to obtain graphene-modified cotton non-woven fabric,which was then assembled into an electroosmotic composite material and its water conductivity was further studied.Studies have shown that the water conductivity of graphene-modified non-woven fabrics has been improved,and the average mass flux can reach 4.64 mg?min-1?cm-2?V-1?driving voltage 7 V?10 V?.3.Due to the textile-based electrode prepared by the method of high-pressure spraying and dipping coating has the problem of the conductive layer falling off,so we use carbon fiber and nickel-plated copper metal non-woven fabric as textile-based electrodes to assemble electroosmotic composite materials with asymmetric electrodes.This combination not only has a good water-conducting effect,its average mass flux is up to 23.49mg?min-1?cm-2?V-1?driving voltage 1 V?6 V?,and its durability is particularly outstanding.It can be immersed in water for a long time??48 h?to maintain its performance.It does not change,and can be repeatedly bent at least 500 times within a certain bending angle?0?150°?,and the material is not damaged.As a proof of concept,we applied wearable electroosmotic composites to sports insoles and sportswear to achieve durable,sufficient directional water transport.Such moisture transporting wearable device has great application potential in areas such as smart clothing and medical protection.In short,the introduction of the principle of electroosmosis allows the fabric to achieve a directional,high-throughput,long-lasting moisture transportion.And the conductive treatment of cotton fabrics through PEDOT:PSS and graphene and the selection of carbon fiber and nickel-plated nonwoven prepared textile-based flexible electrodes.That makes the electroosmotic pump applicable to the field of smart wearables,and realizes the purpose of interdisciplinary research on smart textiles. |
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