Two-dimensional materials have been proved to be effective in improving the performance of anticorrosive coatings.However,most of the reported two-dimensional materials only have the ability to passively block corrosi...Two-dimensional materials have been proved to be effective in improving the performance of anticorrosive coatings.However,most of the reported two-dimensional materials only have the ability to passively block corrosive media and cannot effectively inhibit localized corrosion reactions at the metal/coating interface.Herein,we first synthesized a novel polyaniline(PANI)nanosheet with both barrier and passivation functions for metals.In addition,polydopamine(PDA)wrapped PANI nanosheets(PANI@PDA)were obtained by in situ self-polymerization reaction of dopamine on the PANI surface,which enhance its interfacial interaction with polymeric resin.The chemical structure,morphology and corrosion inhibition properties of the nanosheets were systematically analyzed.The incorporated PANI@PDA nanosheets in composite coating provide a longer penetration path for corrosive mediums.Secondly,the uniformly dispersed two-dimensional nanosheets induce the formation of passivation film on the metal substrate.The protective effect of PANI@PDA nanosheets on coatings was verified by electrochemical impedance spectroscopy(EIS).Results indicated that the prepared composite coating exhibited excellent corrosion resistance throughout the test cycle.This simple and effective modification strategy based on conductive polymers provides a new insight into the development of environmentally adaptive composite coatings with active and passive protection.展开更多
The quasi-phase-matching(QPM)technique has drawn increasing attention due to its promising applications in areas such as nonlinear frequency conversion for generating new laser light sources.In this paper,we will brie...The quasi-phase-matching(QPM)technique has drawn increasing attention due to its promising applications in areas such as nonlinear frequency conversion for generating new laser light sources.In this paper,we will briefly review the main achievements in this field.We give a brief introduction of the invention of QPM theory,followed by the QPM-material fabrication techniques.When combing QPM with the solid-state laser techniques,various laser light sources,such as single-wavelength visible lasers and ultraviolet lasers,red–green–blue three-fundamentalcolor lasers,optical parametric oscillators in different temporal scales,and passive mode-locking lasers based on cascaded second-order nonlinearity,have been presented.The QPM technique has been extended to quantum optics recently,and prospects for the studies are bright.展开更多
基金fundings from the National Natural Science Foundation of China(nos.51971121 and 52002228)the National Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers(CN)(No.U2106216)the Qingdao Marine Science and Technology Innovation Project(No.22-3-3-hygg-27-hy).
文摘Two-dimensional materials have been proved to be effective in improving the performance of anticorrosive coatings.However,most of the reported two-dimensional materials only have the ability to passively block corrosive media and cannot effectively inhibit localized corrosion reactions at the metal/coating interface.Herein,we first synthesized a novel polyaniline(PANI)nanosheet with both barrier and passivation functions for metals.In addition,polydopamine(PDA)wrapped PANI nanosheets(PANI@PDA)were obtained by in situ self-polymerization reaction of dopamine on the PANI surface,which enhance its interfacial interaction with polymeric resin.The chemical structure,morphology and corrosion inhibition properties of the nanosheets were systematically analyzed.The incorporated PANI@PDA nanosheets in composite coating provide a longer penetration path for corrosive mediums.Secondly,the uniformly dispersed two-dimensional nanosheets induce the formation of passivation film on the metal substrate.The protective effect of PANI@PDA nanosheets on coatings was verified by electrochemical impedance spectroscopy(EIS).Results indicated that the prepared composite coating exhibited excellent corrosion resistance throughout the test cycle.This simple and effective modification strategy based on conductive polymers provides a new insight into the development of environmentally adaptive composite coatings with active and passive protection.
基金the National Natural Science Foundation of China(Nos.61205140,11274165,and 11021403)the Jiangsu Science Foundation(BK2011545)the State Key Program for Basic Research of China(Nos.2010CB630703 and 2011CBA00205),and the PAPD.
文摘The quasi-phase-matching(QPM)technique has drawn increasing attention due to its promising applications in areas such as nonlinear frequency conversion for generating new laser light sources.In this paper,we will briefly review the main achievements in this field.We give a brief introduction of the invention of QPM theory,followed by the QPM-material fabrication techniques.When combing QPM with the solid-state laser techniques,various laser light sources,such as single-wavelength visible lasers and ultraviolet lasers,red–green–blue three-fundamentalcolor lasers,optical parametric oscillators in different temporal scales,and passive mode-locking lasers based on cascaded second-order nonlinearity,have been presented.The QPM technique has been extended to quantum optics recently,and prospects for the studies are bright.
