用离子液体(IL)氯化-1-烯丙基-3-甲基咪唑改性氧化石墨烯(IL-GO)/IL改性白炭黑(IL-白炭黑)填充天然橡胶(NR),研究了IL-GO在硫化胶中的分散状况,考察了IL-GO用量对NR混炼胶的结合胶、硫化特性及硫化胶的物理机械性能、导热性能的影响。...用离子液体(IL)氯化-1-烯丙基-3-甲基咪唑改性氧化石墨烯(IL-GO)/IL改性白炭黑(IL-白炭黑)填充天然橡胶(NR),研究了IL-GO在硫化胶中的分散状况,考察了IL-GO用量对NR混炼胶的结合胶、硫化特性及硫化胶的物理机械性能、导热性能的影响。结果表明,IL可以明显改善GO在NR中的分散性,同时可促进NR混炼胶的硫化;当IL-GO用量为1份时,NR硫化胶的物理机械性能和导热性能达到最佳,拉伸强度、撕裂强度和导热系数均达到最大值,分别为27.26 MPa、74.30 k N/m和0.213 W/(m·K);随着IL-GO用量的增加,NR硫化胶的储能模量上升,玻璃化转变温度下降。展开更多
采用离子液体氯化1-烯丙基-3-甲基咪唑(AMI)改性白炭黑,用傅里叶变换红外光谱和固体核磁共振研究了AMI与白炭黑的相互作用,研究了离子液体用量对改性白炭黑填充天然橡胶(NR)的硫化特性、力学性能和动态力学性能的影响。结果表明,AMI与...采用离子液体氯化1-烯丙基-3-甲基咪唑(AMI)改性白炭黑,用傅里叶变换红外光谱和固体核磁共振研究了AMI与白炭黑的相互作用,研究了离子液体用量对改性白炭黑填充天然橡胶(NR)的硫化特性、力学性能和动态力学性能的影响。结果表明,AMI与白炭黑表面之间具有氢键作用,能够明显提高白炭黑在NR中的分散性。AMI能改变白炭黑填充胶料的硫化速率,AMI用量越多,NR胶料的硫化速率越大。随着AMI用量的增加,改性白炭黑填充NR硫化胶的拉伸性能和撕裂性能提高,当AMI用量为1.0份时,NR硫化胶的拉伸强度达到最大值23.95 MPa;当AMI为2.0份时,NR硫化胶的撕裂强度达到最大值71.47 k N/m,与填充未改性白炭黑的NR硫化胶相比,分别提高了102.28%和41.83%。随着AMI用量的增加,NR硫化胶的玻璃化转变温度下降。展开更多
The plausibility of human exposure to particulate matter(PM)has witnessed an increase within the last several years.PM of different sizes has been discovered in the atmosphere given the role of dust transport in weath...The plausibility of human exposure to particulate matter(PM)has witnessed an increase within the last several years.PM of different sizes has been discovered in the atmosphere given the role of dust transport in weather and climate composition.As a regulator,the lung epithelium orchestrates the innate response to local damage.Herein,we developed a lung epithelium-ona-chip platform consisting of easily moldable polydimethylsiloxane layers along with a thin,flexible,and transparent ionic liquid-based poly(hydroxyethyl)methacrylate gel membrane.The epithelium was formed through the culture of human lung epithelial cells(Calu-3)on this membrane.The mechanical stress at the air–liquid interface during inhalation/exhalation was recapitulated using an Arduino-based servo motor system,which applied a uniaxial tensile strength from the two sides of the chip with 10%strain and a frequency of 0.2 Hz.Subsequently,the administration of silica nanoparticles(PM0.5)with an average size of 463 nm to the on-chip platform under static,dynamic,and dynamic+mechanical stress(DMS)conditions demonstrated the effect of environmental pollutants on lung epithelium.The viability and release of lactate dehydrogenase were determined along with proinflammatory response through the quantification of tumor necrosis factor-α,which indicated alterations in the epithelium.展开更多
Diphenyl carbonate(DPC)is one of the versatile carbonates,and is often used for the production of polycarbonates.In recent years,the catalytic synthesis of DPC has become an important topic but the development of a hi...Diphenyl carbonate(DPC)is one of the versatile carbonates,and is often used for the production of polycarbonates.In recent years,the catalytic synthesis of DPC has become an important topic but the development of a highly active metal-free catalyst is a great challenge.Herein,a series of ionic liquids-SBA-15 hybrid catalysts with different functional groups have been developed for the synthesis of DPC under solventfree condition,which are effective and clean instead of the metal-containing catalysts.It is found that in the presence of[SBA-15-IL-OH]Br catalyst,methyl phenyl carbonate(MPC)conversion of 80.5%along with 99.6%DPC selectivity is achieved,the TOF value is thrice higher than the best value reported by using transition metal-based catalysts.Moreover,the catalyst displays remarkable stability and recyclability.This work provides a new idea to design and prepare eco-friendly catalysts in a broad range of applications for the green synthesis of carbonates.展开更多
In the present work,dispersive liquid-liquid microextraction(DLLME)was used to extract six synthetic cannabinoids(JWH-018,JWH-019,JWH-073,JWH-200,or WIN 55,225,JWH-250,and AM-694)from oral fluids.A rapid baseline sepa...In the present work,dispersive liquid-liquid microextraction(DLLME)was used to extract six synthetic cannabinoids(JWH-018,JWH-019,JWH-073,JWH-200,or WIN 55,225,JWH-250,and AM-694)from oral fluids.A rapid baseline separation of the analytes was achieved on a bidentate octadecyl silica hydride phase(Cogent Bidentate C18;4.6 mm×250 mm,4μm)maintained at 37℃,by eluting in isocratic conditions(water:acetonitrile(25:75,V/V)).Detection was performed using positive electrospray ionization-tandem mass spectrometry.The parameters affecting DLLME(pH and ionic strength of the aqueous phase,type and volume of the extractant and dispersive solvent,vortex and centrifugation time)were optimized for maximizing yields.In particular,using 0.5 mL of oral fluid,acetonitrile(1 mL),was identified as the best option,both as a solvent to precipitate proteins and as a dispersing solvent in the DLLME procedure.To select an extraction solvent,a low transition temperature mixture(LTTM;composed of sesamol and chlorine chloride with a molar ratio of 1:3)and dichloromethane were compared;the latter(100μL)was proved to be a better extractant,with recoveries ranging from 73%to 101%by vortexing for 2 min.The method was validated according to the guidelines of Food and Drug Administration bioanalytical methods:intra-day and inter-day precisions ranged between 4%and 18%depending on the spike level and analyte;limits of detection spanned from 2 to 18 ng/mL;matrixmatched calibration curves were characterized by determination coefficients greater than 0.9914.Finally,the extraction procedure was compared with previous methods and with innovative techniques,presenting superior reliability,rapidity,simplicity,inexpensiveness,and efficiency.展开更多
文摘用离子液体(IL)氯化-1-烯丙基-3-甲基咪唑改性氧化石墨烯(IL-GO)/IL改性白炭黑(IL-白炭黑)填充天然橡胶(NR),研究了IL-GO在硫化胶中的分散状况,考察了IL-GO用量对NR混炼胶的结合胶、硫化特性及硫化胶的物理机械性能、导热性能的影响。结果表明,IL可以明显改善GO在NR中的分散性,同时可促进NR混炼胶的硫化;当IL-GO用量为1份时,NR硫化胶的物理机械性能和导热性能达到最佳,拉伸强度、撕裂强度和导热系数均达到最大值,分别为27.26 MPa、74.30 k N/m和0.213 W/(m·K);随着IL-GO用量的增加,NR硫化胶的储能模量上升,玻璃化转变温度下降。
文摘采用离子液体氯化1-烯丙基-3-甲基咪唑(AMI)改性白炭黑,用傅里叶变换红外光谱和固体核磁共振研究了AMI与白炭黑的相互作用,研究了离子液体用量对改性白炭黑填充天然橡胶(NR)的硫化特性、力学性能和动态力学性能的影响。结果表明,AMI与白炭黑表面之间具有氢键作用,能够明显提高白炭黑在NR中的分散性。AMI能改变白炭黑填充胶料的硫化速率,AMI用量越多,NR胶料的硫化速率越大。随着AMI用量的增加,改性白炭黑填充NR硫化胶的拉伸性能和撕裂性能提高,当AMI用量为1.0份时,NR硫化胶的拉伸强度达到最大值23.95 MPa;当AMI为2.0份时,NR硫化胶的撕裂强度达到最大值71.47 k N/m,与填充未改性白炭黑的NR硫化胶相比,分别提高了102.28%和41.83%。随着AMI用量的增加,NR硫化胶的玻璃化转变温度下降。
基金BK acknowledges the TUBITAK 2210-C National Graduate Scholarship Program and access to the laboratory of Prof.Dr.Sinan Akgol at Biochemistry Department of Ege UniversityThis work was supported by the Presidency of the Republic of Türkiye Strategy Budget Department(2019K12-149080).
文摘The plausibility of human exposure to particulate matter(PM)has witnessed an increase within the last several years.PM of different sizes has been discovered in the atmosphere given the role of dust transport in weather and climate composition.As a regulator,the lung epithelium orchestrates the innate response to local damage.Herein,we developed a lung epithelium-ona-chip platform consisting of easily moldable polydimethylsiloxane layers along with a thin,flexible,and transparent ionic liquid-based poly(hydroxyethyl)methacrylate gel membrane.The epithelium was formed through the culture of human lung epithelial cells(Calu-3)on this membrane.The mechanical stress at the air–liquid interface during inhalation/exhalation was recapitulated using an Arduino-based servo motor system,which applied a uniaxial tensile strength from the two sides of the chip with 10%strain and a frequency of 0.2 Hz.Subsequently,the administration of silica nanoparticles(PM0.5)with an average size of 463 nm to the on-chip platform under static,dynamic,and dynamic+mechanical stress(DMS)conditions demonstrated the effect of environmental pollutants on lung epithelium.The viability and release of lactate dehydrogenase were determined along with proinflammatory response through the quantification of tumor necrosis factor-α,which indicated alterations in the epithelium.
基金support from the National Natural Science Foundation of China(No.21808048 and U1704251)Training Plan for University's Young Backbone Teachers of Henan Province(2021GGJS121)+5 种基金Program for Science&Technology Innovation Talents in Universities of Henan Province(23HASTIT014)Postgraduate Education Reform and Quality Improvement Project of Henan Province(YJS2022KC22)Project funded by China Postdoctoral Science Foundation(No.2018M632782)Project funded by Postdoctoral Research Grant in Henan Province(No.001802030)Key Project of Science and Technology Program of Henan Province(No.222102230109,212102310330 and 182102210050)the Science Research Start-up Fund of Henan Institute of Science and Technology(No.2015031).
文摘Diphenyl carbonate(DPC)is one of the versatile carbonates,and is often used for the production of polycarbonates.In recent years,the catalytic synthesis of DPC has become an important topic but the development of a highly active metal-free catalyst is a great challenge.Herein,a series of ionic liquids-SBA-15 hybrid catalysts with different functional groups have been developed for the synthesis of DPC under solventfree condition,which are effective and clean instead of the metal-containing catalysts.It is found that in the presence of[SBA-15-IL-OH]Br catalyst,methyl phenyl carbonate(MPC)conversion of 80.5%along with 99.6%DPC selectivity is achieved,the TOF value is thrice higher than the best value reported by using transition metal-based catalysts.Moreover,the catalyst displays remarkable stability and recyclability.This work provides a new idea to design and prepare eco-friendly catalysts in a broad range of applications for the green synthesis of carbonates.
基金supported by the Sapienza University of Rome through the project RICERCA 2019(protocol number:RG11916B6451D44A)。
文摘In the present work,dispersive liquid-liquid microextraction(DLLME)was used to extract six synthetic cannabinoids(JWH-018,JWH-019,JWH-073,JWH-200,or WIN 55,225,JWH-250,and AM-694)from oral fluids.A rapid baseline separation of the analytes was achieved on a bidentate octadecyl silica hydride phase(Cogent Bidentate C18;4.6 mm×250 mm,4μm)maintained at 37℃,by eluting in isocratic conditions(water:acetonitrile(25:75,V/V)).Detection was performed using positive electrospray ionization-tandem mass spectrometry.The parameters affecting DLLME(pH and ionic strength of the aqueous phase,type and volume of the extractant and dispersive solvent,vortex and centrifugation time)were optimized for maximizing yields.In particular,using 0.5 mL of oral fluid,acetonitrile(1 mL),was identified as the best option,both as a solvent to precipitate proteins and as a dispersing solvent in the DLLME procedure.To select an extraction solvent,a low transition temperature mixture(LTTM;composed of sesamol and chlorine chloride with a molar ratio of 1:3)and dichloromethane were compared;the latter(100μL)was proved to be a better extractant,with recoveries ranging from 73%to 101%by vortexing for 2 min.The method was validated according to the guidelines of Food and Drug Administration bioanalytical methods:intra-day and inter-day precisions ranged between 4%and 18%depending on the spike level and analyte;limits of detection spanned from 2 to 18 ng/mL;matrixmatched calibration curves were characterized by determination coefficients greater than 0.9914.Finally,the extraction procedure was compared with previous methods and with innovative techniques,presenting superior reliability,rapidity,simplicity,inexpensiveness,and efficiency.
