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Materials that change color in response to external stimuli can cater to diverse applications from sensing to art. If made flexible, stretchable and weavable, they may even be directly integrated with advanced technologies such as smart textiles. A new class of engineered composite based on polydiacetylene (PDA) functionalized carbon nanotubes (CNT) shows tremendous potential in this regard. While...
Weavable color-change materials are useful in smart textiles. Here we demonstrate static and programmable color change on flexible polydiacetylene (PDA) coated carbon nanotube (CNT) yarns through 3D hopping-conduction-induced electrochromism. The color change could be achieved using pre-patterning and further specified through defining the current paths. Mild heating before polymerization was used...
Rate-dependent mechanical properties of individual carbon nanotube (CNT) fibers are essential for developing advanced anti-collision composites. In this work, a free-falling Hopkinson tension bar was designed to measure the dynamic tensile strength of CNT fiber. The strength of pure CNT fiber is found to be more sensitive to strain rate than that of composite CNT fiber. The dynamic failure morphologies...
Multiwalled carbon nanotubes (MWCNTs) have been shown to induce electrochromism in polydiacetylene (PDA) formed from the diacetylene monomer 10,12-petacosadiynoic acid (PCDA). This study investigates changes in the backbone of both partially and highly polymerized 10,12-PCDA monomers brought about by the unique electrical transport of underlying MWCNT sheets. The real time variation in absorbance...
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