Reshapeable,rehealable and recyclable sensor fabricated by direct ink writing of conductive composites based on covalent adaptable network polymers

Covalent adaptable network(CAN)polymers doped with conductive nanoparticles are an ideal candidate to create reshapeable,rehealable,and fully recyclable electronics.On the other hand,3D printing as a deterministic manufacturing method has a significant potential to fabricate electronics with low cost and high design freedom.In this paper,we incorporate a conductive composite consisting of polyimine CAN and multi-wall carbon nanotubes into direct-ink-writing 3D printing to create polymeric sensors with outstanding reshaping,repairing,and recycling capabilities.The developed printable ink exhibits good printability,conductivity,and recyclability.The conductivity of printed polyimine composites is investigated at different temperatures and deformation strain levels.Their shape-reforming and Joule heating-induced interfacial welding effects are demonstrated and characterized.Finally,a temperature sensor is 3D printed with defined patterns of conductive pathways,which can be easily mounted onto 3D surfaces,repaired after damage,and recycled using solvents.The sensing capability of printed sensors is maintained after the repairing and recycling.Overall,the 3D printed reshapeable,rehealable,and recyclable sensors possess complex geometry and extend service life,which assist in the development of polymer-based electronics toward broad and sustainable applications.

Implementation and verification of the CEPC baseline tracker using a modern track reconstruction software

Purpose A high-performance tracking system will be crucial for the realization of the full physics potential of the Circular Electron Positron Collider(CEPC)project.Abaseline tracker has been proposed in the Conceptual Design Report and requires detailed studies of the layout geometry and comprehensive understanding of its tracking performance.Methods A Common Tracking Software(ACTS)is an experiment-independent software package and introduced for the track reconstruction for particle and nuclear physics experiments.The CEPC baseline tracker geometry has been implemented in ACTS,and its tracking performance has been evaluated with the provided track finding and fitting algorithms based on the truth tracking method.Results and Conclusion The tracking geometry implemented in ACTS,including the sensitive elements and simplified material distribution,has been validated.The track parameter resolutions obtained with ACTS are consistent with the full simulation results over the momentum range under investigation.ACTS has proven to be an excellent platform for the tracking performance evaluation and the tracker layout optimization.

The 10^th National Congress of Genetic Society of China:Celebrating its 40^th anniversary in Nanjing

The 10National Congress of Genetic Society of China(GSC)was held on November 26th?29th,2018 in Nanjing,where GSC was established and the First National Congress of GSC was held in 1978.This congress was sponsored by GSC,co-sponsored by Genetics Society of Jiangsu Province,Nanjing Agricultural University,State Key Laboratory of Crop Genetics and Germplasm