A graphene oxide/nano-silica(GOS)hybrid was rapidly and easily synthesized using graphene oxide(GO)and nano-silica(nano-SiO_(2))as raw materials,and the synthesized GOS was used to improve the mechanical properties of...A graphene oxide/nano-silica(GOS)hybrid was rapidly and easily synthesized using graphene oxide(GO)and nano-silica(nano-SiO_(2))as raw materials,and the synthesized GOS was used to improve the mechanical properties of epoxy resin(EP).The modified EP with different mass fractions of GOS(0,0.1%,0.2%,0.3%and 0.4%)were prepared and studied.The structure,thermal stability,mechanical properties,fracture toughness and failure morphology of the modified EP were analyzed.The results showed that the tensile strength of GOS modified EP increased from 40.6 MPa to 80.2 MPa compared with EP,the critical stress intensity factor of GOS modified EP increased by 65.9%from 0.82 MPa·m^(1/2)to 1.36 MPa·m^(1/2),indicating a significant enhancement in fracture toughness.In addition,failure morphology was observed by scanning electron microscopy(SEM)observation.The toughness mechanism of the modified EP was also discussed.Finally,the thermal stability of the modified EP was improved by the addition of GOS.Compared with neat EP,the initial thermal degradation temperature and glass transition temperature of GOS modified EP increased by 4.5℃and 10.3℃,respectively.展开更多
A series of nanocomposites based on poly（ε-caprolactone） （PCL） and graphene oxide （GO） were prepared by in situ polymerization. Scanning electron microscopy observation revealed not only a well dispersion of GO...A series of nanocomposites based on poly（ε-caprolactone） （PCL） and graphene oxide （GO） were prepared by in situ polymerization. Scanning electron microscopy observation revealed not only a well dispersion of GO but also a strong interfacial interaction between GO and the PCL matrix, as evidenced by the presence of some GO nanosheets embedded in the matrix. Effects of GO nanofillers on the crystal structure, crystallization behavior and spherulitic morphology of the PCL matrix were investigated in detail. The results showed that the crystallization temperature of PCL enhanced significantly due to the presence of GO in the nanocomposites, however, the addition of GO did not affect the crystal structure greatly. Thermal stability of PCL remarkably increased with the addition of GO nanosheets, compared with that of pure PCL. Incorporation of GO greatly improved the tensile strength and Young＇s modulus of PCL without a significant loss of the elongation at break.展开更多
Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical prop...Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical properties,and easy composition with other materials via surface functional groups.Usually,GO is used as an important raw material for mass production of graphene via reduction.However,under different conditions,the coverage,types,and arrangements of oxygen-containing groups in GO can be varied,which give rise to excellent and controllable physical properties,such as tunable electronic and mechanical properties depending closely on oxidation degree,suppressed thermal conductivity,optical transparency and fluorescence,and nonlinear optical properties.Based on these outstanding properties,many electronic,optical,optoelectronic,and thermoelectric devices with high performance can be achieved on the basis of GO.Here we present a comprehensive review on recent progress of GO,focusing on the atomic structures,fundamental physical properties,and related device applications,including transparent and flexible conductors,field-effect transistors,electrical and optical sensors,fluorescence quenchers,optical limiters and absorbers,surface enhanced Raman scattering detectors,solar cells,light-emitting diodes,and thermal rectifiers.展开更多
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
基金Natural Science Foundation of Jiangsu Province,China(No.BK 20180244)Foundation of Qing Lan Project,ChinaOpening Project of Key Laboratory of Jiangsu Province for Silk Engineering,Soochow University,China(No.KJS2278)。
文摘A graphene oxide/nano-silica(GOS)hybrid was rapidly and easily synthesized using graphene oxide(GO)and nano-silica(nano-SiO_(2))as raw materials,and the synthesized GOS was used to improve the mechanical properties of epoxy resin(EP).The modified EP with different mass fractions of GOS(0,0.1%,0.2%,0.3%and 0.4%)were prepared and studied.The structure,thermal stability,mechanical properties,fracture toughness and failure morphology of the modified EP were analyzed.The results showed that the tensile strength of GOS modified EP increased from 40.6 MPa to 80.2 MPa compared with EP,the critical stress intensity factor of GOS modified EP increased by 65.9%from 0.82 MPa·m^(1/2)to 1.36 MPa·m^(1/2),indicating a significant enhancement in fracture toughness.In addition,failure morphology was observed by scanning electron microscopy(SEM)observation.The toughness mechanism of the modified EP was also discussed.Finally,the thermal stability of the modified EP was improved by the addition of GOS.Compared with neat EP,the initial thermal degradation temperature and glass transition temperature of GOS modified EP increased by 4.5℃and 10.3℃,respectively.
基金financially supported by the National Natural Science Foundation of China(No.31000427)the Fundamental Research Funds for the Central Universities(DUT12JB09)
文摘A series of nanocomposites based on poly（ε-caprolactone） （PCL） and graphene oxide （GO） were prepared by in situ polymerization. Scanning electron microscopy observation revealed not only a well dispersion of GO but also a strong interfacial interaction between GO and the PCL matrix, as evidenced by the presence of some GO nanosheets embedded in the matrix. Effects of GO nanofillers on the crystal structure, crystallization behavior and spherulitic morphology of the PCL matrix were investigated in detail. The results showed that the crystallization temperature of PCL enhanced significantly due to the presence of GO in the nanocomposites, however, the addition of GO did not affect the crystal structure greatly. Thermal stability of PCL remarkably increased with the addition of GO nanosheets, compared with that of pure PCL. Incorporation of GO greatly improved the tensile strength and Young＇s modulus of PCL without a significant loss of the elongation at break.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.11604039,11974068,and 11504040)the Fundamental Research Funds for the Central Universities of China(Grant Nos.DUT18LK07,DUT16RC(4)66,and DUT17RC(4)52)the Supercomputing Center of Dalian University of Technology。
文摘Graphene oxide(GO),the functionalized graphene with oxygenated groups(mainly epoxy and hydroxyl),has attracted resurgent interests in the past decade owing to its large surface area,superior physical and chemical properties,and easy composition with other materials via surface functional groups.Usually,GO is used as an important raw material for mass production of graphene via reduction.However,under different conditions,the coverage,types,and arrangements of oxygen-containing groups in GO can be varied,which give rise to excellent and controllable physical properties,such as tunable electronic and mechanical properties depending closely on oxidation degree,suppressed thermal conductivity,optical transparency and fluorescence,and nonlinear optical properties.Based on these outstanding properties,many electronic,optical,optoelectronic,and thermoelectric devices with high performance can be achieved on the basis of GO.Here we present a comprehensive review on recent progress of GO,focusing on the atomic structures,fundamental physical properties,and related device applications,including transparent and flexible conductors,field-effect transistors,electrical and optical sensors,fluorescence quenchers,optical limiters and absorbers,surface enhanced Raman scattering detectors,solar cells,light-emitting diodes,and thermal rectifiers.
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。
