生物基没食子酸环氧树脂/氧化石墨烯纳米复合材料的制备及热性能

以植物多元酚没食子酸为原料制备了生物基没食子酸环氧树脂(GAER),采用改进的Hummers法制备了氧化石墨烯(GO),并利用硅烷偶联剂KH550对氧化石墨烯进行改性修饰。以琥珀酸酐为固化剂,制备了GAER/KH550-GO生物基纳米复合材料。对所制备的GO及其与GAER的复合材料进行了结构表征和性能测试。结果表明,KH550改性的氧化石墨烯已经剥离形成具有单片分布的结构,GAER/KH550-GO复合材料的储存模量(E′)、玻璃化转变温度(Tg)均随着KH550-GO含量的增加先增加后降低,在KH550-GO的质量分数为0.25%时,Tg提高了21℃,50℃时E′增加了72.2%;在KH550-GO的质量分数为0.75%时,复合材料具有较高的交联密度及耐热性。     

半导体/石墨烯纳米复合材料的制备及其应用进展

综述半导体/石墨烯纳米复合材料的制备及其应用,评述了它们在应用领域,尤其是在先进储能装置、光催化或传感器等领域表现出来的优异性能。在此基础上,进一步提出了它们在未来的可能发展趋势将是进一步降低材料制备成本、深入理解复合材料间相互作用机理及材料结构和组成与性能间的关系等方面。     

纳米石墨烯复合材料的制备及应用研究进展

石墨烯作为一种由单原子紧密堆积成的二维蜂窝状晶格结构碳材料,具有许多特殊的物理化学性质,使其在各个领域均表现出良好的应用前景。目前石墨烯及纳米石墨烯复合材料的制备和应用已成为材料界研究的重点和热点。在简要介绍石墨烯的结构和性质的基础上,介绍了石墨烯的4种制备方法——机械剥离法、化学气相沉积法、化学剥离法和化学合成法。总结了纳米石墨烯/聚合物复合材料以及纳米无机/石墨烯复合材料的制备及应用,并重点讨论了纳米石墨烯复合材料在生物医药、电子器件、微波吸收、传感器以及电极材料等方面独特的应用优势,展望了纳米石墨烯复合材料的发展前景及研究方向。     

石墨烯增强金属基复合材料的制备方法研究进展

石墨烯因其独特的电学、力学和热学等性能,作为强化相在制备轻质、高强度、强韧性的优异合金材料方面越来越受到关注.简单介绍了石墨烯制备方法和性质,综述了石墨烯增强金属基复合材料的制备方法、性能及强化机制,并对影响复合材料结构性质的因素进行了分析,同时展望了今后金属基石墨烯复合材料的研究方向及发展趋势.     

石墨烯及Ag/石墨烯纳米复合材料的原位合成

选择改进的H ummer方法制备氧化石墨烯;采用硼氢化钠和柠檬酸钠相结合的方法还原氧化石墨制备石墨烯及Ag/石墨烯纳米复合材料,采用拉曼光谱、TEM、SEM、UV-Vis、XRD、FTIR等多种测试手段对其表征,发现硼氢化钠可以还原氧化石墨烯中的边缘缺陷,柠檬酸钠可以剥离氧化石墨烯片层并使银纳米颗粒附着在石墨烯片层上,石墨烯层数较少且随着反应时间的延长,银纳米颗粒的尺寸也会逐渐增大.     

石墨烯基纳米复合材料的新进展:结构、合成方法及应用

随着石墨烯研究的发展,将石墨烯与其他物质结合生成复合材料,已经成为该领域的研究热点。由于复合材料各成分之间可以产生协同效应,使得其相关性能得到提高,在诸多领域有着广阔的应用前景。以石墨烯基纳米复合材料为综述对象,详细介绍了制备石墨烯基纳米复合材料的两种新颖方法:气-液界面合成、采用独特的还原剂还原氧化石墨烯。着重介绍了石墨烯-金属氧化物复合材料的制备以及其在气敏传感、生物和智能设备等领域的应用,并展望了A-B-石墨烯三元复合材料的研究前景和发展趋势。     

氧化石墨烯纳米银复合材料的制备及对大肠杆菌抑菌性能的研究

以柠檬酸钠为还原剂,原位制备出氧化石墨烯/纳米银(GO/Ag)复合材料,并采用傅里叶红外光谱仪、纳米粒度分析仪和紫外分光光度计对GO/Ag复合材料进行表征,结果表明氧化石墨烯和纳米银稳定复合。以大肠杆菌为模型菌,通过抑菌圈及平板计数法实验评价了GO/Ag复合材料的抑菌性能,并通过对细胞膜完整性和通透性的影响研究了复合材料的抑菌机理,结果表明,GO/Ag复合材料对大肠杆菌有较强的抑菌效果,最小抑菌浓度(MIC)为0.005mg/mL;其优良的抑菌效果是通过破坏细菌细胞膜完整性,影响细胞膜通透性来完成的。     

石墨烯/银纳米复合材料的制备及其抗菌性能

目的研究石墨烯/银纳米粒子(AgNP/G)复合抗菌材料简单快捷的制备方法。方法在碱性环境下采用原位还原法制备AgNP/G纳米复合材料。利用X射线衍射、红外、紫外和透射电镜等技术对AgNP/G复合材料的结构及形貌进行表征,探讨其形成机理,并通过平板计数法来观察AgNP/G复合材料的抗菌性能。结果所制备的AgNP/G复合材料中,形成的纳米银尺寸较小(15 nm)、粒径均一,在石墨烯片层上分布均匀。当AgNP/G的抗菌质量浓度为20μg/m L时,抗菌率达到98.7%。结论碱的存在能加速银纳米粒子在石墨烯片层上的形成,得到的AgNP/G复合材料抗菌性能优异。     

氧化石墨烯及其复合材料在抗菌领域的研究进展

全球范围内的细菌耐药性增强,传统的抗生素方案逐渐力不从心,抗菌新方案的研发刻不容缓。近年来,氧化石墨烯(GO)因其独特的二维结构和难以形成耐药性的抗菌机理引起了研究人员的关注,成为了抗菌领域的新宠。但由于GO的抗菌性能易受多种因素影响,限制了其广泛应用的可能。因此,从GO的合成方法和抗菌机理入手,着重介绍了GO的抗菌功能化及其复合材料的应用研究进展,并对将来GO基材料在抗菌领域的发展做出展望。     

氧化石墨烯/双马来酰亚胺树脂纳米复合材料的制备及性能

通过溶剂超声剥离法制备氧化石墨烯/双马来酰亚胺(BMI)树脂纳米复合材料。采用X射线衍射(XRD)、透射电镜(TEM)和热重分析(TGA)对纳米复合材料进行表征,并对其力学性能进行研究。结果表明,在N,N-二甲基甲酰胺中超声能有效地将异氰酸苯酯改性的氧化石墨剥离成氧化石墨烯薄片;这种纳米复合材料比BMI树脂具有更好的力学性能和耐热性能,当氧化石墨烯含量为基体树脂的1%时,其拉伸强度、弯曲强度和冲击强度分别为87.7 MPa、142.1MPa、15.9 kJ/m2,当氧化石墨烯含量为1.25%时,其1000℃时的残炭率达41.3%。     

石墨烯及其纳米复合材料作为锂离子电池负极的研究进展

自2004年被发现以来,石墨烯及其纳米复合材料因其特殊的结构和优异的性能而受到广泛关注,并在锂离子电池负极方面展现出巨大的应用价值。首先简单介绍了石墨烯及其常用制备方法,然后详细介绍了石墨烯及其纳米复合材料作为锂离子电池负极材料的研究现状,并阐述了各自的优势与不足,提出了一些改进方案,最后展望了其在锂电负极的应用前景和未来面临的挑战。     

石墨烯及其纳米复合材料作为锂离子电池负极的研究进展

自2004年被发现以来,石墨烯及其纳米复合材料因其特殊的结构和优异的性能而受到广泛关注,并在锂离子电池负极方面展现出巨大的应用价值.首先简单介绍了石墨烯及其常用制备方法,然后详细介绍了石墨烯及其纳米复合材料作为锂离子电池负极材料的研究现状,并阐述了各自的优势与不足,提出了一些改进方案,最后展望了其在锂电负极的应用前景和未来面临的挑战.     

Synthesis of Manganese Ferrite/Graphene Oxide Nanocomposites for Biomedical Applications

In this study, MnFe₂O₄ nanoparticle (MFNP)‐decorated graphene oxide nanocomposites (MGONCs) are prepared through a simple mini‐emulsion and solvent evaporation process. It is demonstrated that the loading of magnetic nanocrystals can be tuned by varying the ratio of graphene oxide/magnetic nanoparticles. On top of that, the hydrodynamic size range of the obtained nanocomposites can be optimized by varying the sonication time during the emulsion process. By fine‐tuning the sonication time, MGONCs as small as 56.8 ± 1.1 nm, 55.0 ± 0.6 nm and 56.2 ± 0.4 nm loaded with 6 nm, 11 nm, and 14 nm MFNPs, respectively, are successfully fabricated. In order to improve the colloidal stability of MGONCs in physiological solutions (e.g., phosphate buffered saline or PBS solution), MGONCs are further conjugated with polyethylene glycol (PEG). Heating by exposing MGONCs samples to an alternating magnetic field (AMF) show that the obtained nanocomposites are efficient hyperthermia agents. At concentrations as low as 0.1 mg Fe mL^?1 and under an 59.99 kA m^?1 field, the highest specific absorption rate (SAR) recorded is 1588.83 W g^?1 for MGONCs loaded with 14 nm MFNPs. It is also demonstrated that MGONCs are promising as magnetic resonance imaging (MRI) T₂ contrast agents. A T₂ relaxivity value (r₂) as high as 256.2 (mM Fe)^?1 s^?1 could be achieved with MGONCs loaded with 14 nm MFNPs. The cytotoxicity results show that PEGylated MGONCs exhibit an excellent biocompatibility that is suitable for biomedical applications.     

石墨烯基材料的生物医用性能及其应用

石墨烯基材料由于具有优异的物理和化学性能,近年来获得了广泛的研究和应用。介绍了石墨烯基材料及其生物特性,讨论了石墨烯材料产生毒性的影响因素和预防措施,对石墨烯基材料在生物医用领域(如药物载体、生物传感器、光热治疗和组织工程材料)的应用情况进行了论述,并对石墨烯基材料的研究发展方向与应用前景进行了展望。     

The Antibacterial Applications of Graphene and Its Derivatives

Graphene materials have unique structures and outstanding thermal, optical, mechanical and electronic properties. In the last decade, these materials have attracted substantial interest in the field of nanomaterials, with applications ranging from biosensors to biomedicine. Among these applications, great advances have been made in the field of antibacterial agents. Here, recent advancements in the use of graphene and its derivatives as antibacterial agents are reviewed. Graphene is used in three forms: the pristine form; mixed with other antibacterial agents, such as Ag and chitosan; or with a base material, such as poly (N‐vinylcarbazole) (PVK) and poly (lactic acid) (PLA). The main mechanisms proposed to explain the antibacterial behaviors of graphene and its derivatives are the membrane stress hypothesis, the oxidative stress hypothesis, the entrapment hypothesis, the electron transfer hypothesis and the photothermal hypothesis. This review describes contributions to improving these promising materials for antibacterial applications.     

Graphene-Based Fibers: Recent Advances in Preparation and Application

Graphene-based fibers (GBFs) are macroscopic 1D assemblies formed by using microscopic 2D graphene sheets as building blocks. Their unique structure exhibits the same merits as graphene such as low weight, high specific surface area, excellent mechanical/electrical properties, and ease of functionalization. Furthermore, the fibrous nature of GBFs is intrinsically compatible with existing textile technologies, making them suitable for applications in flexible and wearable electronics. Recently, novel synthetic methods have endowed GBFs with new structures and functions, further improving their mechanical and electrical properties. These improvements have rapidly bridged the gaps between laboratory demonstrations and real-life applications in fiber-shaped batteries, supercapacitors, and electrochemical sensors. Recent advances in the fabrication, optimization, and application of GBFs are systematically reviewed and a perspective on their future development is given.