Carbon nanotube dry adhesives with temperature-enhanced adhesion over a large temperature range

Abstract

Conventional adhesives show a decrease in the adhesion force with increasing temperature due to thermally induced viscoelastic thinning and/or structural decomposition. Here, we report the counter-intuitive behaviour of carbon nanotube (CNT) dry adhesives that show a temperature-enhanced adhesion strength by over six-fold up to 143 N cm À 2 (4 mm  4 mm), among the strongest pure CNT dry adhesives, over a temperature range from À 196 to 1,000°C. This unusual adhesion behaviour leads to temperature-enhanced electrical and thermal transports, enabling the CNT dry adhesive for efficient electrical and thermal management when being used as a conductive double-sided sticky tape. With its intrinsic thermal stability, our CNT adhesive sustains many temperature transition cycles over a wide operation temperature range. We discover that a 'nano-interlock' adhesion mechanism is responsible for the adhesion behaviour, which could be applied to the development of various dry CNT adhesives with novel features.

Graphene Oxide Epoxy (GO‐xy): GO as Epoxy Adhesive by Interfacial Reaction of Functionalities

“…The samples were examined after the failure and while ECA allows sliding of the glass slides with minimal force, the GO flakes in GO‐xy shows a locking mechanism that protects the surfaces from sliding away easily (Figure d). Although not entirely the same mechanism, improvement in adhesion strength by interlocking mechanism has been observed in carbon nanotubes . It is easier for nanomaterials to fill the voids on rough surfaces that leads to increased bonding.…”

Multi-Walled Carbon Nanotubes Composites for Microwave Absorbing Applications

“…Specifically, composites based on the epoxy resin are used as high-performance materials because of their excellent mechanical properties, chemical resistance, thermal stability, and low production cost. Some examples of their applications are glues, adhesives, protective surface coatings, and electrical insulators [6][7][8]. Possible applications of these composites are also in microwave absorbers and EMI (electromagnetic interference) shielding applications [9][10][11][12][13][14][15][16].…”

Effect of Hydrogen Concentration on the Growth of Carbon Nanotube Arrays for Gecko-Inspired Adhesive Applications

“…Such dry adhesives generally have micro-nano array structures, and are expected to be suitable for robotic end-effectors [4][5][6][7]. At present, there are generally two main types of materials being researched as materials for gecko-inspired dry adhesives [8]: Synthetic polymers [5,9,10] and vertically-aligned carbon nanotubes (VACNTs) [11][12][13][14]. Among them, the nano-scale diameters of carbon nanotubes are far less than the micro-scale diameters of the generally polymeric fibers.…”