Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cr...Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.展开更多
The capturing process for carbon dioxide over porous solid adsorbents such as lithium silicate,lithium aluminate,and magnesium aluminate at pre-combustion temperatures was studied.Lithium silicate was prepared by the ...The capturing process for carbon dioxide over porous solid adsorbents such as lithium silicate,lithium aluminate,and magnesium aluminate at pre-combustion temperatures was studied.Lithium silicate was prepared by the sol gel and solid fusion methods.The lithium silicate adsorbent was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning elec-tron microscopy(SEM),nuclear magnetic resonance(NMR),and surface area.The capturing of carbon dioxide over lithium silicate,lithium aluminate,and magnesium aluminate was explored at different experimental condi-tions such as exposure time,temperature variation,and exposure carbon dioxide pressure.The capturing process for carbon dioxide was investigated over these adsorbents with variation of their metal mole ratios.The effect of the addition of(promoter)sodium,potassium,and cesium in the lithium silicate adsorbent was explored to investigate the variation of the capture of carbon dioxide over these adsorbents.展开更多
The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was investigated.The Li leaching efficiency is increase...The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was investigated.The Li leaching efficiency is increased with increasing concentration of NaOH, specific surface area, and reaction temperature.When leached under optimum conditions, 2 mol/L NaOH, 53 μm particle undersize, 1:10 solid/liquid ratio, 250 r/min stirring speed, 100℃ reaction temperature, 12 hr, the Li leaching efficiency was approximately 70%.However, when the leaching experiment was performed for 48 hr, the concentration of Li+ ions contained in the leach liquor decreased from 1160 to 236 mg/L.To investigate the origin of this phenomenon, the obtained leach residue was analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy.These analyses show that zeolite was formed around the lithium aluminum silicate glass-ceramics, which affected the leaching of by adsorbing Li+ ions.In addition, using the shrinking-core model and the Arrhenius equation, the leaching reaction with NaOH was found to depends on the chemical reaction of the two reactants, with a higher than 41.84 kJ/mol of the activation energy.展开更多
Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety advantages.However,their development is hindered by the limitations of polymer electr...Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety advantages.However,their development is hindered by the limitations of polymer electrolytes,such as low ionic conductivity,poor mechanical strength and inadequate fire resistance.This study presents a thin polyvinylidene fluoride-based composite solid electrolyte film(25μm incorporating twodimensional modified lipophilic lithium magnesium silicate(LLS)as additives with good dispersibility.The incorporation of LLS promotes grain refinement in polyvinylidene fluoride(PVDF),enhances the densification of electrolyte films,increases the tensile strength to10.42 MPa and the elongation to 251.58%,improves ion transport interfac e,and facilitates uniform deposition of lithium ions.Furthermore,LLS demonstrates strong adsorption ability,promoting the formation of solvated molecules,resulting in high ionic conductivity(2.07×10^(-4)S·cm^(-1)at 30℃)and a stable lithium/electrolyte interface.Symmetric Li//Li cells assembled with the thin composite electrolytes exhibit stable cycling for2000 h at 0.1 mA·cm^(-2)and 0.05 mAh·cm^(-2).Additionally,the LiFePO_(4)//Li battery shows a capacity retention rate of99.9%after 200 cycles at 0.5C and room temperature.展开更多
The significance of collagen and vascular in skin augmentation have been recognized in recent years.However,current skin tissue fillers,e.g.hyaluronic acid(HA)or HA-based hydrogel,fail to meet the perfect augmentation...The significance of collagen and vascular in skin augmentation have been recognized in recent years.However,current skin tissue fillers,e.g.hyaluronic acid(HA)or HA-based hydrogel,fail to meet the perfect augmentation requirements due to their inadequate long-term support effect and the lack of tissue-inducing activity.Herein,an injectable skin filler containing hyaluronic acid(HA)hydrogel and lithium calcium silicate(LCS,Li_(2)Ca_(4)Si_(4)O_(13))bioceramic microspheres was developed for skin tissue fillers,owing to the excellent biological function of sil-icate bioceramics.The HA-LCS fillers could be easily injected through a tiny standard medical needle(27 G)with force of less than 36 N,and showed good biocompatibility both in vitro and in vivo.Furthermore,the bioactive ions released from HA-LCS fillers significantly enhanced the expression of vascularization-related genes and collagen-related genes.Importantly,the HA-LCS fillers not only stimulated the regeneration of mature blood vessels,but also promoted collagen secretion in dermal skin and filling area.This study not only presented an injectable filler with enhanced regeneration of blood vessels and collagen,but also provided a new strategy for developing tissue-induced fillers based on bioactive components of silicate bioceramics.展开更多
In order to obtain a single-host-white-light phosphor, a series of Bal.8 -x-y-zSrwLi0.4xCexEuyMnzSi04 （BSLS：Ce3＋,Eu2＋, Mn2＋） powder samples were synthesized via high temperature solid-state reaction. The structu...In order to obtain a single-host-white-light phosphor, a series of Bal.8 -x-y-zSrwLi0.4xCexEuyMnzSi04 （BSLS：Ce3＋,Eu2＋, Mn2＋） powder samples were synthesized via high temperature solid-state reaction. The structure and photoluminescence properties were investigated. Under ultraviolet excitation, the emission spectra contained three bands： the 370-470 nm blue band, the 470-570 nm green band and the 570-700 nm red band, which arose from the 5d---4f transitions of Ce3＋ and Eu2＋, and the 4TI---6A1 transition of Mn2＋, respectively. The excitation spectra of the emissions of Ce3＋ and Mn2＋ ions showed the energy transfer from Ce3＋ to Mn2＋. White light emission was obtained from the tri-doped samples of appropriate doping concentration under 31 0-360 nm excitation.展开更多
Artificial synapse is one of the potential electronics for constructing neural network hardware.In this work,Pt/LiSiO_(x)/TiN analog artificial synapse memristor is designed and investigated.With the increase of compl...Artificial synapse is one of the potential electronics for constructing neural network hardware.In this work,Pt/LiSiO_(x)/TiN analog artificial synapse memristor is designed and investigated.With the increase of compliance current(C.C.)under 0.6 mA,1 mA,and 3 mA,the current in the high resistance state(HRS)presents an increasing variation,which indicates lithium ions participates in the operation process for Pt/LiSiO_(x)/TiN memristor.Moreover,depending on the movement of lithium ions in the functional layer,the memristor illustrates excellent conduction modulation property,so the long-term potentiation(LTP)or depression(LTD)and paired-pulse facilitation(PPF)synaptic functions are successfully achieved.The neural network simulation for pattern recognition is proposed with the recognition accuracy of 91.4%.These findings suggest the potential application of the LiSiO_(x)memristor in the neuromorphic computing.展开更多
Lithium iron silicate （Li2FeSiO4） is capable of affording a much higher capacity than conventional cathodes, and thus, it shows great promise for high-energy battery applications. However, its capacity has often bee...Lithium iron silicate （Li2FeSiO4） is capable of affording a much higher capacity than conventional cathodes, and thus, it shows great promise for high-energy battery applications. However, its capacity has often been adversely affected by poor reaction activity due to the extremely low electronic and ionic conductivity of silicates. Here, we for the first time report on a rational engineering strategy towards a highly active Li2FeSiO4 by designing a carbon nanotube （CNT） directed three-dimensional （3D） porous Li2FeSiO4 composite. As the CNT framework enables rapid electron transport, and the rich pores allow efficient electrolyte penetration, this unique 3D Li2FeSiO4-CNT composite exhibits a high capacity of 214 mAh·g^-1 and retains 96% of this value over 40 cycles, thus, outstripping many previously reported Li2FeSiO4-based materials. Kinetic analysis reveals a high Li＋ diffusivity due to coupling of the migration of electrons and ions. This research highlights the potential for engineering 3D porous structure to construct highly efficient electrodes for battery applications.展开更多
文摘Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.
基金grateful to the Department of Science and Technology,Government of India for awarding Research Grant GAP271526.
文摘The capturing process for carbon dioxide over porous solid adsorbents such as lithium silicate,lithium aluminate,and magnesium aluminate at pre-combustion temperatures was studied.Lithium silicate was prepared by the sol gel and solid fusion methods.The lithium silicate adsorbent was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning elec-tron microscopy(SEM),nuclear magnetic resonance(NMR),and surface area.The capturing of carbon dioxide over lithium silicate,lithium aluminate,and magnesium aluminate was explored at different experimental condi-tions such as exposure time,temperature variation,and exposure carbon dioxide pressure.The capturing process for carbon dioxide was investigated over these adsorbents with variation of their metal mole ratios.The effect of the addition of(promoter)sodium,potassium,and cesium in the lithium silicate adsorbent was explored to investigate the variation of the capture of carbon dioxide over these adsorbents.
基金supported by the Technology Innovation Program(No.20003877,Development of eco-friendly electrochemical recycling system for production of high purity(>99.5)lithium and lithium compounds)funded By the Ministry of Trade,Industry&Energy(MOTIE,Korea)。
文摘The behavior and mechanism of Li leaching from lithium aluminum silicate glass-ceramics which can be used as a secondary source of Li using aqueous NaOH solution was investigated.The Li leaching efficiency is increased with increasing concentration of NaOH, specific surface area, and reaction temperature.When leached under optimum conditions, 2 mol/L NaOH, 53 μm particle undersize, 1:10 solid/liquid ratio, 250 r/min stirring speed, 100℃ reaction temperature, 12 hr, the Li leaching efficiency was approximately 70%.However, when the leaching experiment was performed for 48 hr, the concentration of Li+ ions contained in the leach liquor decreased from 1160 to 236 mg/L.To investigate the origin of this phenomenon, the obtained leach residue was analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy.These analyses show that zeolite was formed around the lithium aluminum silicate glass-ceramics, which affected the leaching of by adsorbing Li+ ions.In addition, using the shrinking-core model and the Arrhenius equation, the leaching reaction with NaOH was found to depends on the chemical reaction of the two reactants, with a higher than 41.84 kJ/mol of the activation energy.
基金financially supported by the National Key R&D Program of China(No.2023YFB2503801)the Key Program of the National Natural Science Foundation of China(No.52231009)+1 种基金the National Science Foundation of China(No.52302253)the Key R&D Program of Hubei Province(No.2023BAB028)。
文摘Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety advantages.However,their development is hindered by the limitations of polymer electrolytes,such as low ionic conductivity,poor mechanical strength and inadequate fire resistance.This study presents a thin polyvinylidene fluoride-based composite solid electrolyte film(25μm incorporating twodimensional modified lipophilic lithium magnesium silicate(LLS)as additives with good dispersibility.The incorporation of LLS promotes grain refinement in polyvinylidene fluoride(PVDF),enhances the densification of electrolyte films,increases the tensile strength to10.42 MPa and the elongation to 251.58%,improves ion transport interfac e,and facilitates uniform deposition of lithium ions.Furthermore,LLS demonstrates strong adsorption ability,promoting the formation of solvated molecules,resulting in high ionic conductivity(2.07×10^(-4)S·cm^(-1)at 30℃)and a stable lithium/electrolyte interface.Symmetric Li//Li cells assembled with the thin composite electrolytes exhibit stable cycling for2000 h at 0.1 mA·cm^(-2)and 0.05 mAh·cm^(-2).Additionally,the LiFePO_(4)//Li battery shows a capacity retention rate of99.9%after 200 cycles at 0.5C and room temperature.
基金supported by the National Natural Science Foundation of China(32225028 and 32130062)Shanghai Pilot Program for Basic Research-Chinese Academy of Science,Shanghai Branch(JCYJ-SHFY-2022-003)Hengdian Group。
文摘The significance of collagen and vascular in skin augmentation have been recognized in recent years.However,current skin tissue fillers,e.g.hyaluronic acid(HA)or HA-based hydrogel,fail to meet the perfect augmentation requirements due to their inadequate long-term support effect and the lack of tissue-inducing activity.Herein,an injectable skin filler containing hyaluronic acid(HA)hydrogel and lithium calcium silicate(LCS,Li_(2)Ca_(4)Si_(4)O_(13))bioceramic microspheres was developed for skin tissue fillers,owing to the excellent biological function of sil-icate bioceramics.The HA-LCS fillers could be easily injected through a tiny standard medical needle(27 G)with force of less than 36 N,and showed good biocompatibility both in vitro and in vivo.Furthermore,the bioactive ions released from HA-LCS fillers significantly enhanced the expression of vascularization-related genes and collagen-related genes.Importantly,the HA-LCS fillers not only stimulated the regeneration of mature blood vessels,but also promoted collagen secretion in dermal skin and filling area.This study not only presented an injectable filler with enhanced regeneration of blood vessels and collagen,but also provided a new strategy for developing tissue-induced fillers based on bioactive components of silicate bioceramics.
基金Project supported by National Natural Science Foundation of China (11074245,10904139,11204292)
文摘In order to obtain a single-host-white-light phosphor, a series of Bal.8 -x-y-zSrwLi0.4xCexEuyMnzSi04 （BSLS：Ce3＋,Eu2＋, Mn2＋） powder samples were synthesized via high temperature solid-state reaction. The structure and photoluminescence properties were investigated. Under ultraviolet excitation, the emission spectra contained three bands： the 370-470 nm blue band, the 470-570 nm green band and the 570-700 nm red band, which arose from the 5d---4f transitions of Ce3＋ and Eu2＋, and the 4TI---6A1 transition of Mn2＋, respectively. The excitation spectra of the emissions of Ce3＋ and Mn2＋ ions showed the energy transfer from Ce3＋ to Mn2＋. White light emission was obtained from the tri-doped samples of appropriate doping concentration under 31 0-360 nm excitation.
基金This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No.XDB44000000the National Natural Science Foundation of China(No.61774057)。
文摘Artificial synapse is one of the potential electronics for constructing neural network hardware.In this work,Pt/LiSiO_(x)/TiN analog artificial synapse memristor is designed and investigated.With the increase of compliance current(C.C.)under 0.6 mA,1 mA,and 3 mA,the current in the high resistance state(HRS)presents an increasing variation,which indicates lithium ions participates in the operation process for Pt/LiSiO_(x)/TiN memristor.Moreover,depending on the movement of lithium ions in the functional layer,the memristor illustrates excellent conduction modulation property,so the long-term potentiation(LTP)or depression(LTD)and paired-pulse facilitation(PPF)synaptic functions are successfully achieved.The neural network simulation for pattern recognition is proposed with the recognition accuracy of 91.4%.These findings suggest the potential application of the LiSiO_(x)memristor in the neuromorphic computing.
基金Acknowledgements We acknowledge the financial support of the National Natural Science Foundation of China （Nos. 51302181, 51372159, 51422206, and 51672182）, the Thousand Youth Talents Plan, the Jiangsu Shuangchuang Plan, the Natural Science Foundation of Jiangsu Province （Nos. BK20151219 and BK20140009）, the Jiangsu Undergraduate Student Innovation and Entrepreneurship Project, the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）, and Russian Scientific Fund （No. 14-43-00072）.
文摘Lithium iron silicate （Li2FeSiO4） is capable of affording a much higher capacity than conventional cathodes, and thus, it shows great promise for high-energy battery applications. However, its capacity has often been adversely affected by poor reaction activity due to the extremely low electronic and ionic conductivity of silicates. Here, we for the first time report on a rational engineering strategy towards a highly active Li2FeSiO4 by designing a carbon nanotube （CNT） directed three-dimensional （3D） porous Li2FeSiO4 composite. As the CNT framework enables rapid electron transport, and the rich pores allow efficient electrolyte penetration, this unique 3D Li2FeSiO4-CNT composite exhibits a high capacity of 214 mAh·g^-1 and retains 96% of this value over 40 cycles, thus, outstripping many previously reported Li2FeSiO4-based materials. Kinetic analysis reveals a high Li＋ diffusivity due to coupling of the migration of electrons and ions. This research highlights the potential for engineering 3D porous structure to construct highly efficient electrodes for battery applications.
