Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and ...Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and corrosion.The coating comprises a hard bionic superhydrophobic top coating and a hydrogel layer underneath for buffering and self-repair.To improve the impact resistance of the top coating,layered structures with different viscoelasticities were constructed by controlling the content of lauric acid(LA)@TiO_(2) particles and carbon nanotubes(CNTs).The amylose hydrogel underlayer not only acts as a shock absorber but also restores potential damage in the top layer,bringing an additional benefit to the corrosion resistance of the coating.Thanks to these three cooperative approaches,the coating exhibits excellent mechanical durability(800 cycles with 600-mesh sandpaper under a 49 kPa load)and corrosion resistance(with a corrosion potential of-0.21 V).Moreover,it maintains its superhydrophobicity after sanding,bending,soaking,and scratching,demonstrating its potential for application to protect transmission pipelines from erosion and corrosion.展开更多
The volume of securely encrypted data transmission increases continuously in modern society with all things connected.Towards this end,true random numbers generated from physical sources are highly required for guaran...The volume of securely encrypted data transmission increases continuously in modern society with all things connected.Towards this end,true random numbers generated from physical sources are highly required for guaranteeing security of encryption and decryption schemes for exchanging sensitive information.However,majority of true random number generators(TRNGs)are mechanically rigid,and thus cannot be compatibly integrated with some specific flexible platforms.Herein,we present a flexible and stretchable bionic TRNG inspired by the uniqueness and randomness of biological architectures.The flexible TRNG film is molded from the surface microstructures of natural plants(e.g.,ginkgo leaf)via a simple,low-cost,and environmentally friendly manufacturing process.In our proof-of-principle experiment,the TRNG exhibits a fast generation speed of up to 1.04 Gbit/s,in which random numbers are fully extracted from laser speckle patterns with a high extraction rate of 72%.Significantly,the resulting random bit streams successfully pass all randomness test suites including NIST,TestU01,and DIEHARDER.Even after 10,000 times cyclic stretching or bending tests,or during temperature shock(-25-80℃),the bionic TRNG still reveals robust mechanical reliability and thermal stability.Such a flexible TRNG shows a promising potential in information security of emerging flexible networked electronics.展开更多
基金supported by the National Natural Science Foundation of China(22375047,51972063,and 22075046)the National Key Research and Development Program of China(2022YFB3804905,2022YFB3804900,and 2019YFE0111200)+3 种基金the Natural Science Foundation for Distinguished Young Scholar of Fujian Province(2020J06038)the Natural Science Foundation of Fujian Province(2020J05098 and 2019J01256)111 Project(D17005)China Postdoctoral Science Foundation(2022M723497)。
文摘Inspired by the layered structure of dental enamel in the human body,a superhydrophobic coating with an elastic gradient was developed and placed on the inner wall of a gas transmission pipeline to reduce erosion and corrosion.The coating comprises a hard bionic superhydrophobic top coating and a hydrogel layer underneath for buffering and self-repair.To improve the impact resistance of the top coating,layered structures with different viscoelasticities were constructed by controlling the content of lauric acid(LA)@TiO_(2) particles and carbon nanotubes(CNTs).The amylose hydrogel underlayer not only acts as a shock absorber but also restores potential damage in the top layer,bringing an additional benefit to the corrosion resistance of the coating.Thanks to these three cooperative approaches,the coating exhibits excellent mechanical durability(800 cycles with 600-mesh sandpaper under a 49 kPa load)and corrosion resistance(with a corrosion potential of-0.21 V).Moreover,it maintains its superhydrophobicity after sanding,bending,soaking,and scratching,demonstrating its potential for application to protect transmission pipelines from erosion and corrosion.
基金This study was financially supported by the funds of the Science Challenging Project(No.TZ2018003)the National Natural Science Foundation of China(Nos.12175204,61875178,61805218,and 12104423).
文摘The volume of securely encrypted data transmission increases continuously in modern society with all things connected.Towards this end,true random numbers generated from physical sources are highly required for guaranteeing security of encryption and decryption schemes for exchanging sensitive information.However,majority of true random number generators(TRNGs)are mechanically rigid,and thus cannot be compatibly integrated with some specific flexible platforms.Herein,we present a flexible and stretchable bionic TRNG inspired by the uniqueness and randomness of biological architectures.The flexible TRNG film is molded from the surface microstructures of natural plants(e.g.,ginkgo leaf)via a simple,low-cost,and environmentally friendly manufacturing process.In our proof-of-principle experiment,the TRNG exhibits a fast generation speed of up to 1.04 Gbit/s,in which random numbers are fully extracted from laser speckle patterns with a high extraction rate of 72%.Significantly,the resulting random bit streams successfully pass all randomness test suites including NIST,TestU01,and DIEHARDER.Even after 10,000 times cyclic stretching or bending tests,or during temperature shock(-25-80℃),the bionic TRNG still reveals robust mechanical reliability and thermal stability.Such a flexible TRNG shows a promising potential in information security of emerging flexible networked electronics.
