Bioinspired Janus Textile with Conical Micropores for Human Body Moisture and Thermal Management

Excessive sweat secreted from the skin often causes undesired adhesion from wetted textiles and cold sensations. Traditional hydrophilic textiles such as cotton can absorb sweat but retain it. A hydrophobic/superhydrophilic Janus polyester/nitrocellulose textile embedded with a conical micropore arr...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2019-10, Vol.31 (41), p.e1904113-n/a
Main Authors: Dai, Bing, Li, Kan, Shi, Lianxin, Wan, Xizi, Liu, Xi, Zhang, Feilong, Jiang, Lei, Wang, Shutao
Format: Article
Language:English
Subjects:
Adhesive strength
bioinspired materials
Biomimetics - instrumentation
Body temperature
Cellulose esters
Cellulose nitrate
Collodion - chemistry
Conical bodies
conical micropores
Cotton
Heat loss
Human body
Humans
Hydrophilicity
Hydrophobic and Hydrophilic Interactions
Hydrophobicity
Polyesters
Polyesters - chemistry
Porosity
Sweat
Temperature
Textiles
Thermal management
Transport properties
wettability
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Summary:Excessive sweat secreted from the skin often causes undesired adhesion from wetted textiles and cold sensations. Traditional hydrophilic textiles such as cotton can absorb sweat but retain it. A hydrophobic/superhydrophilic Janus polyester/nitrocellulose textile embedded with a conical micropore array with a hydrophilic inner surface that can achieve directional liquid transport (with an ultrahigh directional water transport capability of 1246%) and maintain human body temperature (2–3 °C higher than with cotton textiles) is demonstrated. When the hydrophobic polyester layer with large opening of hydrophilic conical micropores contacts the liquid, the Janus polyester/nitrocellulose textile can pump it to the superhydrophilic nitrocellulose layer through the hydrophilic conical micropores driven by capillary force. The Janus polyester/nitrocellulose textile can weaken undesired wet adhesion and heat loss due to the removal of liquid. The water wicking and air permeability of the Janus polyester/nitrocellulose textile is comparable to those of traditional cloths. This study is valuable for designing of functional textiles with directional water transport properties for personal drying and warming applications. A hydrophobic/superhydrophilic Janus polyester/nitrocellulose (PE/NC) textile with asymmetric hydrophilic conical micropores can be constructed by combining a simple laser perforating method and plasma modification. This textile can unidirectionally pump excessive sweat from the hydrophobic layer to the superhydrophilic layer through asymmetric hydrophilic conical micropores from large to small openings, thereby avoiding undesirable sticky and excessive cold sensations from sweat.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201904113