Conventional nanoparticles incorporated into epoxy coatings suffer from poor compatibility and insufficient corrosion improvement,hindering their practical applications.A dual-strategy approach integrating in-situ hos...Conventional nanoparticles incorporated into epoxy coatings suffer from poor compatibility and insufficient corrosion improvement,hindering their practical applications.A dual-strategy approach integrating in-situ host–vip nanoconfinement and surface self-assembly was devised to fabricate 8HQ@ZIF-8/PDA smart nanocontainers.The vip 8-hydroxyquinoline(8HQ)was encapsulated within the zeolitic imidazolate framework-8(ZIF-8)host,leveraging nanoconfinement effects.A bioinspired polydopamine(PDA)layer was then self-assembled on the 8HQ@ZIF-8 surface through dopamine oxidative self-polymerization,resulting in a robust nanocontainer architecture.Density functional theory(DFT)calculations verify that the molecular interactions between the PDA and the ZIF-8 surface was the chemical adsorption.The resultant 8HQ@ZIF-8/PDA retained the rhombic dodecahedral morphology and crystallinity of ZIF-8,demonstrating controlled pH-responsive release behavior.When incorporated into an epoxy(EP)resin matrix on magnesium alloy,the 8HQ@ZIF-8/PDA/EP smart composite coatings exhibited outstanding interfacial compatibility and long-term stability,achieving a low-frequency impedance(|Z|_(n.n1Hz))of 2.49×10^(7)Ωcm^(2),a maximum phase angle of 82.8°,and a breakpoint frequency(f_(b))of 63.34 Hz after 50 days of immersion in a 3.5 wt%NaCl solution.These findings highlight the exceptional self-healing and corrosion-resistant properties of the 8HQ@ZIF-8/PDA/EP smart composite coatings,underscoring its potential for protecting magnesium alloys in aggressive environments.展开更多
Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network....Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network. However, Simultaneous Wireless Information and Power Transfer (SWIPT) in the same RF bands is challenging. The majority of previous studies compared SWIPT performance to Gaussian signaling with an infinite alphabet, which is impossible to implement in any realistic communication system. In contrast, we study the SWIPT system in a well-known Nakagami-m wireless fading channel using practical modulation techniques with finite alphabet. The attainable rate-energy-reliability tradeoff and the corresponding rationale are revealed for fixed modulation schemes. Furthermore, an adaptive modulation-based transceiver is provided for further expanding the attainable rate-energy-reliability region based on various SWIPT performances of different modulation schemes. The modulation switching thresholds and transmit power allocation at the SWIPT transmitter and the power splitting ratios at the SWIPT receiver are jointly optimized to maximize the attainable spectrum efficiency of wireless information transfer while satisfying the WPT requirement and the instantaneous and average BER constraints. Numerical results demonstrate the SWIPT performance of various fixed modulation schemes in different fading conditions. The advantage of the adaptive modulation-based SWIPT transceiver is validated.展开更多
基金the Natural Science Foundation of Hunan Province(2024JJ6364)the National Natural Science Foundation of China(52271073)+1 种基金the Sichuan Science and Technology Program(2024NSFJQ0034)the Innovation Team Funds of China West Normal University(KCXTD2024-1).
文摘Conventional nanoparticles incorporated into epoxy coatings suffer from poor compatibility and insufficient corrosion improvement,hindering their practical applications.A dual-strategy approach integrating in-situ host–vip nanoconfinement and surface self-assembly was devised to fabricate 8HQ@ZIF-8/PDA smart nanocontainers.The vip 8-hydroxyquinoline(8HQ)was encapsulated within the zeolitic imidazolate framework-8(ZIF-8)host,leveraging nanoconfinement effects.A bioinspired polydopamine(PDA)layer was then self-assembled on the 8HQ@ZIF-8 surface through dopamine oxidative self-polymerization,resulting in a robust nanocontainer architecture.Density functional theory(DFT)calculations verify that the molecular interactions between the PDA and the ZIF-8 surface was the chemical adsorption.The resultant 8HQ@ZIF-8/PDA retained the rhombic dodecahedral morphology and crystallinity of ZIF-8,demonstrating controlled pH-responsive release behavior.When incorporated into an epoxy(EP)resin matrix on magnesium alloy,the 8HQ@ZIF-8/PDA/EP smart composite coatings exhibited outstanding interfacial compatibility and long-term stability,achieving a low-frequency impedance(|Z|_(n.n1Hz))of 2.49×10^(7)Ωcm^(2),a maximum phase angle of 82.8°,and a breakpoint frequency(f_(b))of 63.34 Hz after 50 days of immersion in a 3.5 wt%NaCl solution.These findings highlight the exceptional self-healing and corrosion-resistant properties of the 8HQ@ZIF-8/PDA/EP smart composite coatings,underscoring its potential for protecting magnesium alloys in aggressive environments.
基金the financial support of National Natural Science Foundation of China(NSFC),Grant No.61971102,61871076the Key Research and Development Program of Zhejiang Province under Grant No.2022C01093.
文摘Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network. However, Simultaneous Wireless Information and Power Transfer (SWIPT) in the same RF bands is challenging. The majority of previous studies compared SWIPT performance to Gaussian signaling with an infinite alphabet, which is impossible to implement in any realistic communication system. In contrast, we study the SWIPT system in a well-known Nakagami-m wireless fading channel using practical modulation techniques with finite alphabet. The attainable rate-energy-reliability tradeoff and the corresponding rationale are revealed for fixed modulation schemes. Furthermore, an adaptive modulation-based transceiver is provided for further expanding the attainable rate-energy-reliability region based on various SWIPT performances of different modulation schemes. The modulation switching thresholds and transmit power allocation at the SWIPT transmitter and the power splitting ratios at the SWIPT receiver are jointly optimized to maximize the attainable spectrum efficiency of wireless information transfer while satisfying the WPT requirement and the instantaneous and average BER constraints. Numerical results demonstrate the SWIPT performance of various fixed modulation schemes in different fading conditions. The advantage of the adaptive modulation-based SWIPT transceiver is validated.
