关键词： 石墨烯   甲基对硫磷   电化学传感器   钯纳米颗粒  

摘要： 通过一步合成法制备了氧化石墨烯载钯纳米复合材料(PdNPs@GO)。该材料兼具GO和PdNPs的特性,将其修饰玻碳电极,构建了一种高灵敏度、低检测限、宽线性范围的甲基对硫磷电化学传感器。实验结果表明,该材料不仅增加了电极的有效比表面积,还提高了电极的导电性和电催化性能。最低检测限为6.536μg/L,并在19.608~579.000μg/L的浓度范围内具有良好的线性相关性。

关键词： 非织造布   石墨烯改性   过滤性能   还原氧化石墨烯   品质因子  

摘要： 为提高非织造材料的过滤特性,利用石墨烯及其衍生物的特性,采用浸渍试验方法对现有的聚酯纤维非织造布过滤材料及装备进行改进,并对其结构及过滤性能进行测试分析。结果显示:氧化石墨烯(GO)过滤材料、还原氧化石墨烯(rGO)过滤材料的过滤效率相比于原聚酯纤维非织造布过滤材料明显提升,且rGO过滤材料效率最高。在过滤速度为0.8 m/s时过滤效率均达到最大。GO过滤材料和rGO过滤材料主要提高了PM_(2.5)的捕集效果。此外,rGO过滤材料的QF值最大,对PM_(10)、PM_(2.5)、PM_1的QF值分别为0.0059 Pa^(-1)、0.0039 Pa^(-1)、0.0026 Pa^(-1)。认为:在实际应用中应综合匹配过滤效率与阻力的关系,优化制备方法,减少纤维间改性物质的沉积现象,提升新型空气过滤材料性能。

关键词： 草莓   保鲜   包装材料   石墨烯  

摘要： 目的为了延缓草莓贮藏期间品质的下降,研究2种石墨烯包装材料对草莓的保鲜效果。方法分别用石墨烯5C、石墨烯1B、PE和PVC材料包装草莓,分析其在贮藏0、3、6、9、12 d时的色泽、硬度、腐烂率、失重率、可溶性糖含量、总酸质量分数等指标变化,探讨2种石墨烯材料对草莓贮藏期间品质的影响规律。结果随着贮藏时间的延长,与PE和PVC包装相比,石墨烯5C和石墨烯1B包装的草莓腐烂率较低。贮藏12 d时,石墨烯1B包装的草莓表面出现少量菌丝,其他3种包装的草莓在贮藏9 d时出现大量菌丝;石墨烯5C、石墨烯1B、PE和PVC包装的草莓失重率较0 d分别减少0.38%、0.29%、1.10%和1.14%;石墨烯1B组的丙二醛含量最低,为1.31μmol/g。贮藏期间,4组草莓的色泽和总酸质量分数的差异不明显。结论石墨烯1B包装材料在抑菌、保持色泽、减少失重等方面的效果更好,有利于延长草莓的贮藏期。

关键词： 还原氧化石墨烯   二氧化锰   丝素蛋白   浸渍法   柔性电极   超级电容器  

摘要： 为提高石墨烯基柔性电极的综合性能,通过真空辅助抽滤和化学还原的方式,制备了丝素蛋白/还原氧化石墨烯(SF/rGO)复合薄膜,在硫酸钾/高锰酸钾(K_(2)SO_(4)/KMnO_(4))溶液中,以SF/rGO作为碳源,制备了二氧化锰@丝素蛋白/还原氧化石墨烯(MnO_(2)@SF/rGO)复合薄膜,考察了K_(2)SO_(4)/KMnO_(4)的浸渍时间对MnO_(2)@SF/rGO薄膜的力学性能及电化学性能的影响。结果表明:当浸渍时间为60 min时,制得的MnO_(2)@SF/rGO薄膜具有优异的力学性能与电化学性能,薄膜电极的拉伸强度为(41.4±3.4)MPa,当电流密度为0.25 mA/cm^(2)时,其面积比电容达到548.7 mF/cm^(2);该薄膜组装成的超级电容器器件在0.25 mA/cm^(2)电流密度下,面积比电容为200 mF/cm^(2),在5 mA/cm^(2)的电流密度下循环6000次,仍可保持85%的优异倍率性能。

关键词： Shear strength  

摘要： The interfacial properties of high-modulus carbon fiber (HMCF) composites have always been the key to their applications, and surface modification of HMCF is one of the important ways to improve the interfacial properties. Graphene nanosheets (GNP) were introduced into the surface of HMCF by electrophoretic deposition, and the surface morphology and surface chemical state of HMCF before and after modification were characterized by SEM and XPS, and the interlaminar shear strength (ILSS) and moisture absorption rate of HMCF reinforced epoxy resin composites before and after modification were tested. The results show that the surface electrophoretic deposition of GNP by HMCF can not only improve the interfacial properties of the reinforced epoxy resin composites, but also reduce the moisture absorption rate of the composites. When the GNP concentration was 0.5 mg/mL and the electrophoretic deposition voltage was 10 V, the interlaminar shear performance of the composites increased by 8.8% to 75.6 MPa, and the moisture absorption rate was reduced by 9.5% compared with the unmodified sample after 30 days of storage at 90℃ and 80% relative humidity (RH), and the interlayer shear performance remained at 67.8 MPa after 60 days of storage. Both interfacial and hygrothermal properties of the modified HMCF comosites have been improved. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Corrosion resistance  

摘要： As a derivative of graphene, graphene oxide (GO) has excellent comprehensive performance, showing great application potential in metal corrosion and protection. GO has not only a two-dimensional layered structure but also contains hydroxyl, carbonyl, carboxyl, epoxy groups and other functional groups that can be used as active sites with other substances for covalent/non-covalent functionalization modification, so GO is often used as a filler to enhance the comprehensive performance of coatings. This paper reviews the recent research progress on GO composite coating in metal corrosion and protection. The first part summarizes the morphology of metal corrosion and the corrosion protection methods, explains the primary forms of metal corrosion, and discusses the current main metal corrosion protection methods. The second part introduces the physicochemical properties of graphene and its derivatives. In this paper, GO is the main focus. It has tremendous application potential in metal corrosion protective coatings due to its sheet structure, excellent dispersion, and abundant oxygen-containing functional groups on the surface, which are the active point of the reaction and easy modification. The third part introduces the current GO composite coating, which compares the corrosion resistance of traditional coatings, GO organic/ inorganic unit composite coatings and GO multi-composite coatings. It is found that the performance of GO multi-component composite coating is far better than that of GO organic/inorganic unit composite coating and traditional coating. This is due to the excellent dispersion of GO, which enables it to fill the pores that occur during the curing and film-forming process of organic polymer materials and improve the corrosion resistance of the coating. The photogenic cathodic protection mechanism and current situation of GO anti-corrosion coating are introduced, and due to the green environmental protection and excellent anti-corrosion effect, it is

关键词： Self assembly  

摘要： The weak interface strength between carbon fiber (CF) and polymer matrix severely limits their practical application in fields such as automotive lightweighting. To address this issue, a series of boehmite/graphene with different contents were prepared by hydrothermal method and successfully introduced to the surface of CF via self-assembly method to modify the interface of carbon fiber/epoxy resin composites (CF/EPs). A series of tests were conducted to investigate the mechanical properties of the composites before and after modification and the results showed that the best performance was achieved when the boehmite/graphene mass ratio was 2∶1 (BG-2). Compared with CF/EP, the modified BGCF/EP-2 showed significant enhancements in interfacial shear strength (116.1%), interlaminar shear strength (56.0%), tensile strength (61.1%), and flexural strength (30.4%). Finally, the schematic diagrams of the possible multiscale interfacial modification mechanism in the CF/EPs were further analyzed based on the results of SEM images and contact angle tests. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： 石墨烯厚膜   本征热扩散系数   单一大孔洞   密集小孔洞   面外结晶性  

摘要： 电子元件集成度的快速提升对器件热管理提出了更高的要求.石墨烯凭借其出色的导热性能成为备受关注的材料之一.目前制备高热导率石墨烯厚膜的主流方法是将氧化石墨烯组装成膜再还原,尽管前人的研究取得了突出成效,但截止目前仍未能完全理解石墨烯膜内部缺陷结构对热导率的具体影响机制,这将限制热导率的进一步提升,达到或超过1500 W·m-1·K-1.在氧化石墨烯膜的热还原过程中,不可避免地会形成一些孔洞结构,通过降低整体密度的方式降低热导率.热扩散系数作为决定热导率大小的另一因素,孔洞对其影响因素却尚未被研究过.在这里,我们定义了包含孔洞的石墨烯膜材料特有的本征热扩散系数,并通过多种电子显微学方法、热扩散系数的测试和有限元模拟,详细研究了石墨烯厚膜的本征热扩散系数与微观结构之间的关联.我们旨在阐明孔洞对热扩散系数以及热导率的影响方式和作用机制.研究结果揭示了不同尺寸和数量的孔洞对热扩散系数的影响,发现密集小孔洞结构可使热扩散系数降低39.4%,而同等面积的单一大孔洞结构对热扩散系数的降低仅约16.1%.通过三维重构获得的统计结论也与计算结果完全匹配.其内在机制是密集小孔洞结构的存在对原有传热路径的破坏更为严重,而单一大孔洞结构的这一作用则相对较弱,只是降低了整体密度从而降低热导率.此外,研究发现面外结晶性对热扩散系数有显著影响,进一步增进了对影响热扩散系数的微观机理的认识.通过阐明这些机制,我们的研究加深了对石墨烯厚膜微观结构与热学性能关联的理解,为生产超高热导率的石墨烯厚膜提供了重要信息,也为下一代电子器件热管理解决方案提供了有效策略.

关键词： 超声   羟基自由基   石墨烯分散液  

摘要： 为解决前期研究中采用羟自由基剥离制备的高质量石墨烯产品的团聚问题,开发了超声辅助羟基自由基剥离的方法,成功制备出高浓度且稳定的石墨烯分散液。通过优化制备条件得到了质量浓度高达1.98 g/L且稳定长达90 d的石墨烯分散液。透射电子显微镜(TEM)表明在分散过程中石墨烯片层结构没有发生变化,通过Zeta电位表征和粒径分布分析了分散液长期稳定存在的机制。本文所述方法解决了传统制备过程中石墨烯分散液易团聚、浓度低、稳定性差以及环境污染等问题,同时具有应用于大规模生产的潜力。

关键词： 发布仪式   标识吊牌   石墨烯多功能复合纤维  

摘要： 3月11日,“‘标’定健康,‘烯’启未来—石墨烯多功能复合纤维标识吊牌发布仪式”在国家会展中心(上海)举办,石墨烯多功能复合纤维标识吊牌正式发布。中国化学纤维工业协会会长陈新伟、副会长兼秘书长关晓瑞等领导出席发布仪式。本次发布仪式由杭州高烯科技有限公司主办、中国化学纤维工业协会支持。活动以“‘标’定健康,‘烯’启未来”为主题,意在通过统一的标识体系和严格的认证流程,为石墨烯多功能复合纤维产品建立权威认证标准,帮助消费者轻松识别高品质的石墨烯产品。