A sensitive
electro-thermochromic Janus fabric driven by voltage
is demonstrated via a facial double side coating. The graphene forms
a conductive layer that allows Joule heating to supply the thermal
resource for the electro-thermochromic behavior of polyester fabric.
The thermochromic dye with reversible color-changing property is coated
on the opposite side of the graphene layer. The color of electro-thermochromic
Janus fabric changes from blue to white with a gradual heating that
exceeded 45 °C at the applied voltage of 10 V. The switching
rate of color is rapid with the increase of temperature from the room
temperature to above 45 °C in 8 s, resulting from the superior
resistive heating of the graphene. The electrical conductivity of
the electro-thermochromic Janus fabric is not disturbed once undergoing
a bending angle range from 30° to 150° and the temperature
remains stable after 1000 bending cycles which clearly indicates the
excellent flexibility of the fabric. The steady signal in the heating/cooling
curve is observed after 500 cycles, pointing out the outstanding durability
of the electro-thermochromic Janus fabric under the supplied voltage.
It is realizable that the color of electro-thermochromic Janus fabric
is triggered accurately by varying the supplied voltage. The simplicity
of this design makes it attractive for the application of flexible
electro-thermochromic textile, such as active visual camouflage, personal
thermal management, and information displays.
Photoresponsive foams can be generated from single-component solutions of a nonionic azobenzene surfactant, as well as from multiple-component industrial systems.
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