Smart coating textiles for visible and infrared camouflage with photochromism and tunable emissivity

The development of sophisticated multispectral detectors leads to the failure of camouflage technology limited to a specific spectrum, which pushes the exploration of multispectral camouflage materials. However, one of the great challenges in multispectral camouflage is to attain compatibility. This work reports the smart coating textile with tunable infrared radiation characteristics and the capability of stimuli-responsive isomerization, for visible and infrared camouflage. The molecular interactions and synergistic effects of designed polyurethane and chromogen within the composite coating, pave the way for the compatibility of infrared and visible dual camouflage. We demonstrate that the smart coating textile has a controllable infrared emissivity ranging from 0.77 to 0.94. Moreover, the coating textile exhibits adaptively color-changing behavior in response to environmental changes. These coating textiles are characterized by low cost, good durability, stable performance, as well as infrared and visible compatible camouflage. We expect this work may inspire and promote the development of multispectral compatible camouflage materials.</p

Thermoelectric Energy Conversion Using Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Fibers Based on Low-Temperature In Situ Polymerization and the Freeze–Thaw Method

Wearable devices based on organic thermoelectric (TE) fibers or textiles are attracting widespread attention because of their impressive structural features and high heat-to-electricity conversion capability. However, the production of low-cost, high-TE, and high-mechanical-performance TE fibers is still a challenge. Herein, a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) spinning solution were synthesized by low-temperature in situ polymerization and freeze–thaw (FT) treatment. Also PEDOT:PSS TE fibers were prepared by wet spinning. PEDOT:PSS fibers with excellent properties were obviously improved by regulating the polymerization reaction temperature and number of FT cycles. The optimized PEDOT:PSS fibers obtained at a pretty low in situ polymerization temperature (−18 °C) and FT2 cycles excited a considerably high Seebeck coefficient of 40.8 μV·K–1, a high electrical conductivity of 980 S·cm–1, and a tensile breaking strength of 57.42 cN. The method is cost-effective and could be realized in mass production, demonstrating its potential application in wearable electronic devices

Graphene Oxide Nanopowder-Based Hydrophobic Fluid Diode Fabric with Passive Radiative Warming for Simultaneous Thermal and Moisture Management during Cold Weather

Fabrics with simultaneous thermal and moisture management are of great importance for improving human comfort and saving energy during cold weather. In this study, fabric capable of simultaneous thermal and moisture management was fabricated by using a one-stop solution. This fabric, consisting of polyester fabric and a hydrophobic paste with graphene oxide (GO) nanopowder, was fabricated by a single-side coating. Because of its collaborative influence in regulating thermal moisture, the fabric featured a warming effect, regardless of whether skin perspiration was present. Based on the passive radiative warming ability of GO nanopowder, the fabric exhibited effective warming (producing a skin temperature approximately 2.9 °C higher than that of polyester) in the absence of perspiration. Meanwhile, it achieved efficient directional sweat transportation (with an accumulative one-way transport capability of 1062%) and heat loss reduction during evaporation to maintain an adequate body temperature (approximately 3.0 °C higher than that for polyester and approximately 1.8 °C higher than that for Janus fabric with a hydrophilic layer) in the presence of perspiration to avoid an after-chill effect. Because of simultaneous thermal and moisture management effects, this bilayer hydrophobic fluid diode fabric shows potential for practical applications in static settings (indoor environments with no perspiration) and dynamic settings (indoor exercise scenarios in which sweat is produced) to maintain warmth during cold weather

Graphene Oxide Nanopowder-Based Hydrophobic Fluid Diode Fabric with Passive Radiative Warming for Simultaneous Thermal and Moisture Management during Cold Weather

Fabrics with simultaneous thermal and moisture management are of great importance for improving human comfort and saving energy during cold weather. In this study, fabric capable of simultaneous thermal and moisture management was fabricated by using a one-stop solution. This fabric, consisting of polyester fabric and a hydrophobic paste with graphene oxide (GO) nanopowder, was fabricated by a single-side coating. Because of its collaborative influence in regulating thermal moisture, the fabric featured a warming effect, regardless of whether skin perspiration was present. Based on the passive radiative warming ability of GO nanopowder, the fabric exhibited effective warming (producing a skin temperature approximately 2.9 °C higher than that of polyester) in the absence of perspiration. Meanwhile, it achieved efficient directional sweat transportation (with an accumulative one-way transport capability of 1062%) and heat loss reduction during evaporation to maintain an adequate body temperature (approximately 3.0 °C higher than that for polyester and approximately 1.8 °C higher than that for Janus fabric with a hydrophilic layer) in the presence of perspiration to avoid an after-chill effect. Because of simultaneous thermal and moisture management effects, this bilayer hydrophobic fluid diode fabric shows potential for practical applications in static settings (indoor environments with no perspiration) and dynamic settings (indoor exercise scenarios in which sweat is produced) to maintain warmth during cold weather

Graphene Oxide Nanopowder-Based Hydrophobic Fluid Diode Fabric with Passive Radiative Warming for Simultaneous Thermal and Moisture Management during Cold Weather

Fabrics with simultaneous thermal and moisture management are of great importance for improving human comfort and saving energy during cold weather. In this study, fabric capable of simultaneous thermal and moisture management was fabricated by using a one-stop solution. This fabric, consisting of polyester fabric and a hydrophobic paste with graphene oxide (GO) nanopowder, was fabricated by a single-side coating. Because of its collaborative influence in regulating thermal moisture, the fabric featured a warming effect, regardless of whether skin perspiration was present. Based on the passive radiative warming ability of GO nanopowder, the fabric exhibited effective warming (producing a skin temperature approximately 2.9 °C higher than that of polyester) in the absence of perspiration. Meanwhile, it achieved efficient directional sweat transportation (with an accumulative one-way transport capability of 1062%) and heat loss reduction during evaporation to maintain an adequate body temperature (approximately 3.0 °C higher than that for polyester and approximately 1.8 °C higher than that for Janus fabric with a hydrophilic layer) in the presence of perspiration to avoid an after-chill effect. Because of simultaneous thermal and moisture management effects, this bilayer hydrophobic fluid diode fabric shows potential for practical applications in static settings (indoor environments with no perspiration) and dynamic settings (indoor exercise scenarios in which sweat is produced) to maintain warmth during cold weather

Graphene Oxide Nanopowder-Based Hydrophobic Fluid Diode Fabric with Passive Radiative Warming for Simultaneous Thermal and Moisture Management during Cold Weather

Fabrics with simultaneous thermal and moisture management are of great importance for improving human comfort and saving energy during cold weather. In this study, fabric capable of simultaneous thermal and moisture management was fabricated by using a one-stop solution. This fabric, consisting of polyester fabric and a hydrophobic paste with graphene oxide (GO) nanopowder, was fabricated by a single-side coating. Because of its collaborative influence in regulating thermal moisture, the fabric featured a warming effect, regardless of whether skin perspiration was present. Based on the passive radiative warming ability of GO nanopowder, the fabric exhibited effective warming (producing a skin temperature approximately 2.9 °C higher than that of polyester) in the absence of perspiration. Meanwhile, it achieved efficient directional sweat transportation (with an accumulative one-way transport capability of 1062%) and heat loss reduction during evaporation to maintain an adequate body temperature (approximately 3.0 °C higher than that for polyester and approximately 1.8 °C higher than that for Janus fabric with a hydrophilic layer) in the presence of perspiration to avoid an after-chill effect. Because of simultaneous thermal and moisture management effects, this bilayer hydrophobic fluid diode fabric shows potential for practical applications in static settings (indoor environments with no perspiration) and dynamic settings (indoor exercise scenarios in which sweat is produced) to maintain warmth during cold weather

Graphene Oxide Nanopowder-Based Hydrophobic Fluid Diode Fabric with Passive Radiative Warming for Simultaneous Thermal and Moisture Management during Cold Weather

Fabrics with simultaneous thermal and moisture management are of great importance for improving human comfort and saving energy during cold weather. In this study, fabric capable of simultaneous thermal and moisture management was fabricated by using a one-stop solution. This fabric, consisting of polyester fabric and a hydrophobic paste with graphene oxide (GO) nanopowder, was fabricated by a single-side coating. Because of its collaborative influence in regulating thermal moisture, the fabric featured a warming effect, regardless of whether skin perspiration was present. Based on the passive radiative warming ability of GO nanopowder, the fabric exhibited effective warming (producing a skin temperature approximately 2.9 °C higher than that of polyester) in the absence of perspiration. Meanwhile, it achieved efficient directional sweat transportation (with an accumulative one-way transport capability of 1062%) and heat loss reduction during evaporation to maintain an adequate body temperature (approximately 3.0 °C higher than that for polyester and approximately 1.8 °C higher than that for Janus fabric with a hydrophilic layer) in the presence of perspiration to avoid an after-chill effect. Because of simultaneous thermal and moisture management effects, this bilayer hydrophobic fluid diode fabric shows potential for practical applications in static settings (indoor environments with no perspiration) and dynamic settings (indoor exercise scenarios in which sweat is produced) to maintain warmth during cold weather