关键词： 道路工程   石墨烯   橡胶沥青   路用性能  

摘要： 为研究石墨烯对橡胶沥青及混合料性能的影响,选取橡胶沥青和SBS改性沥青作为对照组,首先采用离析、动态剪切流变和弯曲梁流变等试验,针对石墨烯/橡胶复合改性沥青的储存稳定性和高低温流变性能进行研究,然后基于一系列室内试验系统评价了石墨烯对橡胶沥青混合料路用性能的影响规律。结果表明,掺入石墨烯可提高橡胶沥青的储存稳定性和高温抗车辙及抗永久变形性能,但也降低了橡胶沥青的低温应力松弛能力;石墨烯能够显著增强橡胶沥青混合料的高温稳定性和抗水损害性,但同时也削弱了混合料在低温条件下的抗裂性能;石墨烯用量过多易形成聚团致使沥青性能下降,建议石墨烯用量控制在0.06%左右。

关键词： 阿奇霉素   聚二烯丙基二甲基氯化铵   功能化石墨烯   纳米铂   传感器   伏安法  

摘要： 采用一步水热法合成了负载纳米铂粒子的聚二烯丙基二甲基氯化铵功能化石墨烯(PtNPs/PDDA/GR),用红外光谱(IR)、X射线衍射(XRD)、电化学交流阻抗(EIS)等手段对复合纳米材料进行了表征.采用循环伏安法研究了阿奇霉素在(PtNPs/PDDA/GR/GCE)传感器上的电化学行为,并优化了电化学测量条件.结果表明,该传感器具有较好的电化学响应,在阿奇霉素浓度为8.0×10^(-7)~1×1.0^(-5) mol·L^(-1)时,其氧化峰电流(I p)与浓度呈良好的线性关系,检出限为3.7×10^(-8) mol·L^(-1).该传感器成功用于市售药品中阿奇霉素含量的测定,回收率为99.4%~101.6%.该方法测定阿奇霉素具有灵敏度高、准确性好等优点,具有一定的实际应用价值.

关键词： 超级电容器   电化学   柔性纤维   石墨烯   碳纤维   碳纳米管  

摘要： 简单介绍了碳基纤维状柔性超级电容器的工作原理及纤维状电极的制备方法;详细综述了石墨烯纤维、碳纤维、碳纳米管纤维三种碳基纤维状柔性超级电容器的研究现状,其中重点讨论了三种碳基纤维的各自的特性和改良方案,简单总结了碳基纤维状柔性超级电容器的实际应用;最后展望了碳基纤维状材料在柔性超级电容器领域存在的问题及未来的研究方向。

关键词： MnO_(2)/石墨烯薄膜   新型电极材料   协同组装  

摘要： 通过电化学剥离制备石墨烯,同时协同组装制备了3D MnO_(2)/石墨烯电极薄膜材料,电化学性能测试表明,它具有较高的电容量、倍率性能和较好的循环稳定性,在1 A/g的电流密度下具有607 F/g的较高电容量,在循环10 000圈后仍保持94.1%的容量值,未来可以应用到新型电极材料等领域。

关键词： graphene oxide   cellulose nanocrystal   Pickering emulsion   phase change material microcapsule   photothermal  

摘要： Phase change materials(PCMs)have attracted significant attention in thermal management due to their ability to store and release large amounts of heat during phase ***,their widespread application is restricted by leakage *** PCMs within polymeric microcapsules is a promising strategy to prevent leakage and increase heat transfer area with ***,photothermal PCM microcapsules are particularly desirable for solar energy ***,we fabricated photothermal PCM microcapsules with melamine-formaldehyde resin(MF)as shell using cellulose nanocrystal(CNC)and graphene oxide(GO)co-stabilized Pickering emulsion droplets as *** displays outstanding Pickering emulsifying ability and can facilitate the fixation of GO at the oil-water interface,resulting in a stable CNC/GO co-stabilized PCM Pickering emulsion.A polydopamine(PDA)layer was coated in-situ on the emulsion droplets via oxidization self-polymerization of ***,GO was reduced to reduced GO(rGO)due to the reducing ability of *** outmost MF shell of the PCM microcapsules was formed in-situ through the polymerization and crosslinking of MF *** resulted PCM@CNC/rGO/PDA/MF microcapsules exhibit uniform sizes in the micrometer range,excellent leakage-proof performance,high phase change enthalpy(175.4 J g^(−1))and PCM encapsulation content(84.2%).Moreover,the presence of rGO and PDA endows PCM@CNC/rGO/PDA/MF microcapsules with outstanding photothermal conversion *** temperature of PCM@CNC/rGO/PDA/MF microcapsule slurries(15wt.%)can reach 73°C after light irradiation at 1 W cm^(−2).Therefore,photothermal PCM@CNC/rGO/PDA/MF microcapsules are promising for solar energy harvesting,thermal energy storage,and release in various applications,such as energy-efficient buildings and smart textiles.

关键词： 石墨烯量子点   质粒pBR322 DNA   光断裂DNA   凝胶电泳方法  

摘要： 研究发现及验证了一种新型的石墨烯量子点(GQDs),该量子点具有高效产生单线态氧的能力,并在光断裂DNA领域展现出显著的应用潜力。在可见光照射下,无论是在有氧条件还是厌氧条件下,这种GQDs都能有效地切割质粒pBR322 DNA。通过DNA凝胶电泳方法,证实了GQDs在光照射下产生单线态氧的能力,并定量评估了其对DNA的切割效果。在有氧和厌氧条件下,GQDs均显示出优异的DNA切割活性,这一结果为深刻理解GQDs与DNA的相互作用机制提供了新的视角。

关键词： Li-ion battery   Blue phosphorene   Anode material   Density functional theory  

摘要： There is an ideal desire to develop the high-performance anodes materials for Liion batteries(LIBs),which requires not onlyhigh stability and reversibility,but also rapidcharging/discharging *** this work,webuiltablue phosphorene-graphene(BlueP-G)intralayer heterostructure by connecting BlueP and graphene monolayers at zigzag edges with covalent *** on the density functional theory simulation,the electronic structure of the heterostructure,Li adsorption and Li diffusion on heterostructure were systematically *** with the pristine BlueP,the existence of graphene layer increases the overall conductivity of BlueP-G intralayer *** significantly enhanced adsorption energy indicates the Li deposition on anode surface is energetically *** fast diffusion of Li with energy barrier as low as 0.02-0.09 eV indicates the growth of Li dendrite could be suppressed and the stability and reversibility of the battery will be *** a combination of increased conductivity of electronic charge,excellent Li adsorption and Li mobility on surface,BlueP-G intralayer heterostructure with zigzag interface is quite promising in the application of anode material for Li-ion batteries.

关键词： 氧化石墨烯   创伤敷料   抗菌机制  

摘要： 近年来抗菌药物滥用导致的耐药在全球得到广泛关注。现有的抗菌药物对耐药病原菌抑制力、杀伤力有限,严重威胁创伤救治等重症患者的生命安全,给国家带来了沉重的社会负担和经济损失。氧化石墨烯(GO)属于石墨烯衍生物,具抗菌能力,与其他材料复合抗菌能力增强。文章就近年来GO复合敷料的制备、抗菌机制及应用进行综述,以期能为设计和研发新型GO复合创伤敷料提供重要参考。

关键词： THz antenna   multi-beam   graphene   dual-band   reconfigurable  

摘要： In this paper,a dual-band graphene-based frequency selective surface(GFSS)is investigated and the operating mechanism of this GFSS is *** adjusting the bias voltage to control the graphene chemical po-tential between 0 eV and 0.5 eV,the GFSS can achieve four working states:dual-band passband,high-pass lowimpedance,low-pass high-impedance,and *** on this GFSS,a hexagonal radome on a broadband omnidirectional monopole antenna is proposed,which can achieve independent 360°six-beam omnidirectional scanning at 1.08 THz and 1.58 THz dual *** addition,while increasing the directionality,the peak gains of the dual bands reach 7.44 dBi and 6.67 dBi,*** work provides a simple method for realizing multi-band terahertz multi-beam reconfigurable antennas.

关键词： 石墨烯   离子辐照   界面热导   晶格结构   吸附作用  

摘要： 作为一种二维材料,石墨烯因其超高的导热系数而被广泛研究,特别是在电子器件散热领域。然而,石墨烯界面的低热导限制了石墨烯在散热领域中应用。为了提高石墨烯界面的热传导效率,文章通过聚焦镓离子束对石墨烯进行离子辐照,研究了离子辐照能量对石墨烯界面热输运的影响。实验测量结果显示,随着离子辐照能量的增加,Al/graphene/SiO2的界面热导呈现上升的趋势,并且在30 kV能量下升高了近3倍。实验表征及理论计算结果显示,镓离子辐照破坏了石墨烯原有的晶格结构,导致离子辐照石墨烯表面上的C/O化学官能团发生了重构,提高了铝膜与离子辐照石墨烯之间界面的吸附作用,进而增加了界面上的声子透射率,最终提升了Al/graphene/SiO2的界面热导。As a two-dimensional material, graphene has been widely studied for its ultra-high thermal conductivity, especially in the field of electronic device cooling. However, the high thermal resistance at the graphene interface limits the application of graphene in the field of heat dissipation. In order to improve the heat conduction efficiency of graphene interface, the effects of energy of ion irradiation on the thermal transport across the graphene interface are investigated in this paper after graphene irradiated by focusing gallium ion beams. It is demonstrated that the interfacial thermal conductance of Al/graphene/SiO2 shows an upward trend with increasing energy and increases up to nearly 3 times at the energy of 30 kV. The experimental characterization and theoretical calculation results show that Ga ion irradiation destroys the original lattice structure of graphene, leading to the reconstruction of C/O chemical functional groups on the ion-irradiated graphene surface, which intensifies the adsorption strength between Al film and ion-irradiated graphene. The increased interfacial adsorption strength is beneficial to more phonons being able to transport across the interface, and finally leads to the increased thermal conductance of Al/graphene/SiO2.