A self-healable conductive composite is developed by combining the small molecules and nanotubes through host-guest interactions. This material shows uniform conductivity, microwave absorption and humidity sensing properties, and can be rapidly healed to over 90% electrical and mechanical properties with the aid of water multiple times. In addition, the produced material is also remouldable and recyclable.Driven by the motivation of developing advanced reliable and durable materials, there has been intense research into selfhealing materials. 1 But up to now, most self-healing materials are structural materials. 2 The research on functional materials with self-healing properties is relatively rare. 3 Electrically conductive materials are a class of functional materials and are indispensable for the development of various modern electronics. 4 Restoration of the conductivity of an electronic component could be of great significance for building advanced electronics. 5 A few healable conductive materials have been developed. 6 For example, Bielawski etc. firstly fabricated a self-healing conductor by introducing reversible bonds into conductive polymers which consist of N-heterocyclic carbenes and transition metals, 7 but the healing process requires high temperatures and solvent vapor. Polymeric microcapsules incorporated with conductive species as the healing agent were also explored to create self-healing conductive materials. 8 When mechanical damage was exerted to the capsules, these capsules were ruptured and the conductive species were released to the damaged region. Hence, the conductivity was restored. This capsule-based method is fast, efficient, and the healing process is autonomous. 9 But healing is not repeatable at a given place and does not allow simultaneous structural healing. Another alternative method is to impart the selfhealing ability of polymers to inorganic conductive materials (such as Ag, mNi, and nanotubes). 10 These materials heal themselves either by manually bring the broken conductors into contact or with the aid of stimuli. 11 However, among these materials, hydrogenbonded materials suffer from the slow healing speed and poor tolerance to moisture, and multilayer films deposited silver nanowires show nonuniform electrical properties from the interior to the surface. Developing conductive materials that possess parameters including uniform conductivity, fast self-healing speed, both electrical and mechanical healing capability, and repeatable healing capability is still a challenge.In this communication, we design a composite material by combining the small molecules and nanotubes through hostguest interactions. The resultant composite shows uniform conductivity, and can be rapidly healed to over 90% electrical and mechanical properties with the aid of water multiple times. In addition, the produced material is also remouldable and recyclable. b-Cyclodextrin-decorated single-walled carbon nanotubes (b-CD-SWNT) acted as macro-crosslinkers, and endowed the composite with mechanical s...

A novel approach has been developed to prepare the magnetic micelles. Polyethylene glycol (PEG) and poly(N-isopropylacrylamide) (PNIPAM) are firstly attached on the surface of the magnetic nanoparticle via the host-guest inclusion between ferrocene groups (Fc) and b-cyclodextrin (b-CD). Then the resulting MNPs became amphiphilic in water above the LCST of PNIPAM and self-assembled into magnetomicelles with a size of 250 nm. These hybrid micelles show high loading capacity for anticancer drug (DOX) and high saturation magnetization simultaneously. Furthermore, these micelles could disassemble under the effects of oxidant or temperature, providing an opportunity to fine-tune the release properties of the encapsulated drug in response to temperature, H 2 O 2 or pH independently, or a combined effect of multiple stimuli.Taking other advantages of magnetic carriers, such as high sensitivity to the external magnetic field, contrast effect to magnetic resonance, and magnetic hyperthermia, the micelles developed by this study show great potential application in cancer treatment.

No abstract