High-quality graphene flakes have long been desirable for numerous applications including energy stor- age, printable electronics, and catalysis. In this contribution, we report a green, efficient, facile gas-driven e...High-quality graphene flakes have long been desirable for numerous applications including energy stor- age, printable electronics, and catalysis. In this contribution, we report a green, efficient, facile gas-driven exfoliation process for the preparation of high-quality graphene in large scale. The gas exfoliation process was realized by the interplay between the expansion of interlayer at high temperature and the gasifi- cation of liquid nitrogen within the interlayer. Detailed experiments demonstrated that the higher tem- perature was critical to the formation of fewer layers. The exfoliated graphene was proved to be of high quality. We further investigated the electrochemical behavior of this exfoliated graphene. As a result, this few-layered graphene demonstrated an enhanced capability as a supercapacitor, much higher than its counterpart parent material.展开更多
Micro/nanomotors(MNMs)have recently emerged as highly promising drug delivery vehicles,showing great potential for biomedical applications.MNMs are typically classified based on their driving mechanisms,and one notabl...Micro/nanomotors(MNMs)have recently emerged as highly promising drug delivery vehicles,showing great potential for biomedical applications.MNMs are typically classified based on their driving mechanisms,and one notable category is gas-driven MNMs,which are self-propelled at the micro/nano scale by gases generated through chemical reactions.These motors can effectively overcome various physiological barriers by utilizing unique physiological actions and driving forces in vivo,gas-driven MNMs offer significant advantages in treating diseases such as tumors and thrombosis.This review first explores the underlying mechanisms of gas-driven MNMs,then discusses their recent applications in overcoming physiological barriers.Finally,it analyses their future prospects and advantages,aiming to inspire further research and accelerate clinical translation in the biomedical field.展开更多
The hydrodynamic characteristics of a rectangular gas-driven inverse liquid-solid fluidized bed(GDFB)using particles of different diameters and densities were investigated in detail.Rising gas bubbles cause a liquid u...The hydrodynamic characteristics of a rectangular gas-driven inverse liquid-solid fluidized bed(GDFB)using particles of different diameters and densities were investigated in detail.Rising gas bubbles cause a liquid upflow in the riser portion,enabling a liquid downflow that causes an inverse fluidization in the downer portion.Four flow regimes(fixed bed regime,initial fluidization regime,complete fluidization regime,and circulating fluidization regime)and three transition gas velocities(initial fluidization gas velocity,minimum fluidization gas velocity,and circulating fluidization gas velocity)were identified via visual observation and by monitoring the variations in the pressure drop.The axial local bed voidage(e)of the downer first decreases and then increases with the increase of the gas velocity.Both the liquid circulation velocity and the average particle velocity inside the downer increase with the increase of the gas velocity in the riser,but decrease with the particle loading.An empirical formula was proposed to successfully predict the Richardson-Zaki index“n”,and the predicted e obtained from this formula has a±5%relative error when compared with the experimental e.展开更多
Gas-driven permeation(GDP)and plasma-driven permeation(PDP)of hydrogen gas through Ga In Sn/Fe are systematically investigated in this work.The permeation parameters of hydrogen through Ga In Sn/Fe,including diffusivi...Gas-driven permeation(GDP)and plasma-driven permeation(PDP)of hydrogen gas through Ga In Sn/Fe are systematically investigated in this work.The permeation parameters of hydrogen through Ga In Sn/Fe,including diffusivity,Sieverts'constant,permeability,and surface recombination coefficient are obtained.The permeation flux of hydrogen through Ga In Sn/Fe shows great dependence on external conditions such as temperature,hydrogen pressure,and thickness of liquid Ga In Sn.Furthermore,the hydrogen permeation behavior through Ga In Sn/Fe is well consistent with the multilayer permeation theory.In PDP and GDP experiments,hydrogen through Ga In Sn/Fe satisfies the diffusion-limited regime.In addition,the permeation flux of PDP is greater than that of GDP.The increase of hydrogen plasma density hardly causes the hydrogen PDP flux to change within the test scope of this work,which is due to the dissolution saturation.These findings provide guidance for a comprehensive and systematic understanding of hydrogen isotope recycling,permeation,and retention in plasma-facing components under actual conditions.展开更多
基金the China National Natural Science Foundation of China (Nos. 21722604, 21576122, 21376111)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)+1 种基金a scholarship from the China Scholarship Council (CSC)the Postgraduate Innovation Project of Jiangsu Province (NO. KYLX15_1067)
文摘High-quality graphene flakes have long been desirable for numerous applications including energy stor- age, printable electronics, and catalysis. In this contribution, we report a green, efficient, facile gas-driven exfoliation process for the preparation of high-quality graphene in large scale. The gas exfoliation process was realized by the interplay between the expansion of interlayer at high temperature and the gasifi- cation of liquid nitrogen within the interlayer. Detailed experiments demonstrated that the higher tem- perature was critical to the formation of fewer layers. The exfoliated graphene was proved to be of high quality. We further investigated the electrochemical behavior of this exfoliated graphene. As a result, this few-layered graphene demonstrated an enhanced capability as a supercapacitor, much higher than its counterpart parent material.
基金supported by the National Natural Science Foundation of China(Nos.82222067,and 82102936)Outstanding Youth Foundation of Henan Province Henan(No.222300420020)+3 种基金China Postdoctoral Science Foundation(No.2023M743232)the Postdoctoral Fellowship Program of CPSF under Grant Number(No.GZB20230676)Scientific and Technological Innovation Talent in Central Plains,Key Projects of Advantageous disciplines in Henan Province(No.222301420011)Scientific and Technological Project of Henan Province(No.242102310450).
文摘Micro/nanomotors(MNMs)have recently emerged as highly promising drug delivery vehicles,showing great potential for biomedical applications.MNMs are typically classified based on their driving mechanisms,and one notable category is gas-driven MNMs,which are self-propelled at the micro/nano scale by gases generated through chemical reactions.These motors can effectively overcome various physiological barriers by utilizing unique physiological actions and driving forces in vivo,gas-driven MNMs offer significant advantages in treating diseases such as tumors and thrombosis.This review first explores the underlying mechanisms of gas-driven MNMs,then discusses their recent applications in overcoming physiological barriers.Finally,it analyses their future prospects and advantages,aiming to inspire further research and accelerate clinical translation in the biomedical field.
文摘The hydrodynamic characteristics of a rectangular gas-driven inverse liquid-solid fluidized bed(GDFB)using particles of different diameters and densities were investigated in detail.Rising gas bubbles cause a liquid upflow in the riser portion,enabling a liquid downflow that causes an inverse fluidization in the downer portion.Four flow regimes(fixed bed regime,initial fluidization regime,complete fluidization regime,and circulating fluidization regime)and three transition gas velocities(initial fluidization gas velocity,minimum fluidization gas velocity,and circulating fluidization gas velocity)were identified via visual observation and by monitoring the variations in the pressure drop.The axial local bed voidage(e)of the downer first decreases and then increases with the increase of the gas velocity.Both the liquid circulation velocity and the average particle velocity inside the downer increase with the increase of the gas velocity in the riser,but decrease with the particle loading.An empirical formula was proposed to successfully predict the Richardson-Zaki index“n”,and the predicted e obtained from this formula has a±5%relative error when compared with the experimental e.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11905151 and 11875198)the National Key Research and Development Program of China(Grant No.2022YFE03130000)。
文摘Gas-driven permeation(GDP)and plasma-driven permeation(PDP)of hydrogen gas through Ga In Sn/Fe are systematically investigated in this work.The permeation parameters of hydrogen through Ga In Sn/Fe,including diffusivity,Sieverts'constant,permeability,and surface recombination coefficient are obtained.The permeation flux of hydrogen through Ga In Sn/Fe shows great dependence on external conditions such as temperature,hydrogen pressure,and thickness of liquid Ga In Sn.Furthermore,the hydrogen permeation behavior through Ga In Sn/Fe is well consistent with the multilayer permeation theory.In PDP and GDP experiments,hydrogen through Ga In Sn/Fe satisfies the diffusion-limited regime.In addition,the permeation flux of PDP is greater than that of GDP.The increase of hydrogen plasma density hardly causes the hydrogen PDP flux to change within the test scope of this work,which is due to the dissolution saturation.These findings provide guidance for a comprehensive and systematic understanding of hydrogen isotope recycling,permeation,and retention in plasma-facing components under actual conditions.
