石墨烯/陶瓷基复合材料研究进展

2004年以来,石墨烯以其优异的力学、电学、热学和光学性能以及独特的二维结构成为材料领域的研究热点。本文结合作者所在课题组的相关工作,综述了石墨烯应用于陶瓷基复合材料的国内外研究进展,重点介绍了石墨烯/陶瓷复合粉体的制备、石墨烯/陶瓷基复合材料的烧结工艺以及性能,探讨了石墨烯/陶瓷基复合材料的研究发展方向及应用前景。     

负载型石墨烯基纳米复合材料摩擦学研究现状及发展趋势

石墨烯基由于优异的性能,受到了广泛的关注.在较为全面的掌握其基本的性能之后,如何将石墨烯基与其他材料进行复合,制备新型材料以进一步促进相关研究领域的发展成了新的方向.综述单粒子、多粒子、不同形貌、离子液体4类石墨烯基纳米复合材料的制备与摩擦学性能,通过介绍负载型石墨烯基纳米复合材料在摩擦领域的研究与应用为下一步研究提供了重要参考.通过与传统润滑材料对比,石墨烯基纳米复合材料在作为润滑材料时展现出了优异的性能,对相关领域研究具有重要意义.     

石墨烯/聚吡咯复合电极材料超电容性能研究进展

分析了目前石墨烯和聚吡咯(PPy)用作电极材料的不足,详细介绍了近年来超级电容器用石墨烯/PPy复合电极材料的研究进展,指出石墨烯/PPy复合材料在能量转换和存储领域的未来发展方向.     

石墨烯基催化剂的研究进展

近年来,二维石墨烯由于其独特的热、电和光学性能而引起极大的关注。理论上,石墨烯具有高的比表面积,使其非常适于用作许多材料的理想载体。石墨烯是非常受欢迎的纳米材料,研究人员利用石墨烯非凡的性质将其与不同材料进行复合得到性质各异的复合材料并应用于各个领域。本文阐述了石墨烯基复合材料在催化领域的研究进展概况,特别是在光催化和电催化领域,介绍了近三年石墨烯基复合材料在催化方面取得的成果,分析了其特性、制备方法及物质间的相互作用等因素对催化性能的影响。指出了石墨烯基复合材料目前在催化领域存在的问题及未来发展的方向,期望为石墨烯基材料在催化剂方面的应用提供参考。     

石墨烯复合材料的研究及其应用

综述了石墨烯复合材料的结构和分类,主要包括石墨烯-纳米粒子复合材料、石墨烯-聚合物复合材料和石墨烯-碳基材料复合材料,并简述石墨烯复合材料在催化领域、电化学领域、生物医药领域和含能材料领域的应用。     

石墨烯/水泥基复合材料的性能研究进展

石墨烯是一种具有二维晶格结构的碳纳米材料,其力学、热学、电学性能都非常优异,成为近几年材料领域的研究热点。据统计,将石墨烯应用到生物医学、电子工业中的研究较多,而近年来对于石墨烯在水泥基材料中的应用也有了一些研究进展。本文主要对石墨烯/水泥基复合材料的力学、电学、热学以及耐久性能进行了概述,以利于进一步开展石墨烯水泥基复合材料的研究工作。     

天大设计出光敏分子/纳米模板复合结构

正日前,天津大学封伟教授带领的科研团队设计出国际首个光敏分子/纳米模板复合结构,并制备出全新的单枝/双枝偶氮苯分子共价接枝石墨烯杂化材料,突破了分子级光热能存储与可控释放的难题,为未来太阳能的高能、长效存储与转化提供了重要的材料基础和设计方向。相关研究成果在线发表于材料化学领域顶级期刊《材料化学杂志》上。光热直接转换与存储技术是颠覆传统能源利     

石墨烯基TiO_2光催化剂的制备及其研究进展

石墨烯作为一种新型二维碳质纳米材料,与TiO_2复合可制得石墨烯基TiO_2光催化材料。介绍了石墨烯的结构与性质,概述了石墨烯及石墨烯基TiO_2光催化剂的制备方法,并总结了石墨烯基TiO_2复合材料在光催化分解水制氢、光催化还原CO_2、光催化降解有机污染物等领域的应用及未来的发展方向。     

基于三维石墨烯/聚苯胺复合材料的制备方法及在超级电容器中的研究进展

三维石墨烯具有丰富的孔洞结构、大的比表面积、高的导电率、快的充电速率和长的循环寿命等优异性质,将其与聚苯胺复合制备三维石墨烯/聚苯胺复合材料可以充分发挥石墨烯和聚苯胺的优势性能,制得电化学性能优异的复合材料。该复合材料在超级电容器电极材料领域得到了广泛的关注。综述了三维石墨烯/聚苯胺复合材料的制备方法及其电化学性能,并针对复合材料研究中存在的问题、未来的研究方向进行了展望。     

石墨烯/聚苯胺复合材料的制备及在超级电容器中的应用

超级电容器是一种新型的能量存储与转换装置,具有广阔的发展前景,而制约其发展的最主要因素是电极材料。石墨烯/聚苯胺复合材料作为一种新型电极材料,兼具双电层电容和法拉第赝电容的特性,在超级电容器中具有潜在应用前景,有望成为下一代电极材料。本文综述了石墨烯/聚苯胺复合材料的制备方法及其在超级电容器的应用,并指出其中存在的一些问题及对其发展前景进行了展望。     

煤基石墨烯及复合材料在储能领域的应用

石墨烯及复合材料具有比表面积大、电导率高、导热性能和力学性能良好等优点,在电极材料、传感器、储氢材料等领域具有广泛的应用。但以高碳含量的天然资源煤为前体制备煤基石墨烯及复合材料达到煤炭清洁高效利用的研究目前报道有限,尤其是将其作为电极材料应用到储能领域的研究较少。本文重点总结了以不同煤质及衍生物为原料构建不同形貌和结构的煤基石墨烯及复合材料的方法以及存在的问题,详细介绍了煤基石墨烯及复合材料在储能领域,尤其是超级电容器、锂离子电池及钠离子电池领域的应用研究现状,最后提出了当前煤基石墨烯及复合材料的主要研究方向。该综述旨在为煤基新型石墨烯及复合材料的制备开发以及在储能领域的应用提供一定的思路。     

Graphene-based membranes for pervaporation processes

Two-dimensional graphene and its derivatives exhibiting distinct physiochemical properties are intriguing building blocks for researchers from a large variety of scientific fields. Assembling graphene-based materials into membrane layers brings great potentials for high-efficiency membrane processes. Particularly, pervaporation by graphene-based membranes has been intensively studied with respect to the membrane design and preparation. This review aims to provide an overview on the graphene-based membranes for pervaporation processes ranged from fabrication to application. Physical or chemical decoration of graphene-based materials is elaborated regarding their effects on the microstructure and performance. The mass transport of pervaporation through graphene-based membranes is introduced, and relevant mechanisms are described. Furthermore, performances of state-of-the-art graphene-based membranes for different pervaporation applications are summarized. Finally, the perspectives of current challenges and future directions are presented.     

石墨烯基自支撑夹层材料在锂硫电池中的研究进展

近年来,高比能锂-硫电池作为最具前景的新能源储存装置之一引起了人们的广泛关注。然而,在该电池体系中,中间产物聚硫化物的溶解造成的穿梭效应会明显降低电池的循环性能和硫利用率,严重阻碍锂-硫电池的推广应用。综述了近年来石墨烯和石墨烯基复合自支撑中间层材料在锂-硫电池中的应用,例如,通过物理或化学限域的方法减缓多硫化物的穿梭并改善锂-硫电池电化学性能等,并对石墨烯基复合自支撑中间层材料未来在锂硫电池中的实际应用进行了展望。     

石墨烯的制备及其在水处理中的应用研究进展

石墨烯是一种由碳原子以sp~2杂化轨道形成的只有一个碳原子厚度的二维碳质新材料,优异的特性使其在很多领域有着广泛应用。简述了石墨烯的特性,介绍了石墨烯及其氧化物的制备方法,详细阐述了石墨烯及其氧化物的复合材料在水处理领域的应用。石墨烯及其氧化物加入到其他材料中可提升其他材料的性能,但它们对水中有机物及重金属离子吸附机理还有待进一步研究。     

An Update on Graphene-Based Nanomaterials for Neural Growth and Central Nervous System Regeneration

Thanks to their reduced size, great surface area, and capacity to interact with cells and tissues, nanomaterials present some attractive biological and chemical characteristics with potential uses in the field of biomedical applications. In this context, graphene and its chemical derivatives have been extensively used in many biomedical research areas from drug delivery to bioelectronics and tissue engineering. Graphene-based nanomaterials show excellent optical, mechanical, and biological properties. They can be used as a substrate in the field of tissue engineering due to their conductivity, allowing to study, and educate neural connections, and guide neural growth and differentiation; thus, graphene-based nanomaterials represent an emerging aspect in regenerative medicine. Moreover, there is now an urgent need to develop multifunctional and functionalized nanomaterials able to arrive at neuronal cells through the blood-brain barrier, to manage a specific drug delivery system. In this review, we will focus on the recent applications of graphene-based nanomaterials in vitro and in vivo, also combining graphene with other smart materials to achieve the best benefits in the fields of nervous tissue engineering and neural regenerative medicine. We will then highlight the potential use of these graphene-based materials to construct graphene 3D scaffolds able to stimulate neural growth and regeneration in vivo for clinical applications.     

Graphene as initiator/catalyst in polymerization chemistry

One of the most important applications of graphene-based materials is the formation of nanocomposite materials, where graphene in the bulk-polymer matrix transfers its properties onto the polymeric material. Control of the polymer/graphene interface by attached polymeric interlayers is essential to generate nanocomposites, thus avoiding the aggregation of graphene nanoparticles. Among all graphene materials graphene oxide (GO) and reduced graphene oxide (r-GO) can be prepared on large scales useful for mass production graphene/polymer composites. The direct use of graphene materials as both, the polymerization initiator or catalyst and additive not only diminishes the agglomeration of particles in composites but also reduces the process of composite production to one facile step, which in turn avoids further purification regarding to strong acid initiators and metal particles catalysts. Here, literature activities within the past ∼10 years using graphene-based materials either as initiator or catalyst in different polymerization reactions are reviewed.     

石墨烯在光催化水解制氢中的应用

由于石墨烯优异的电子结构和电子传输性能,使得其在光催化领域的研究得到了广泛的关注。本文简要介绍了最新以石墨烯为基础的复合光催化剂的制备方法及其在催化水分解制氢方面的应用,重点评述了石墨烯及其氧化物、TiO2与石墨烯类复合物、CdS与石墨烯类复合物、含氧金属酸盐与石墨烯类复合物等的光催化性能,简要说明了光敏化、贵金属负载、非金属掺杂等对复合物光催化性能的影响。最后,指出对于石墨烯与纳米材料复合物的结构及光催化作用的机理都有待于进一步的研究,以便充分利用石墨烯的二维平面结构制得具有较高光催化水解制氢活性的催化剂。     

Mechanics of nanoscale wrinkling of graphene on a non-developable surface

As a two-dimensional crystal, the graphene sheet is often used with substrate materials because the freestanding graphene tends to corrugate and can hardly display its extraordinary properties in devices. However, the substrate is rarely perfectly-flat, but has microscopic roughness. Whether or not the graphene sheet can conform fully to a substrate with nano- and micro-roughness is essential for the performance of the graphene-based devices. In this paper, a theoretical model is developed to predict the morphology of a monolayer graphene sheet attaching to the substrate with microscopic non-developable roughness by an energy-based analysis. The final graphene morphology is revealed to result from the competition between two energy terms: the adhesion energy between graphene and substrate, and the strain energy stored in the graphene due to the deformations. Thus, by accounting for these two parts of energy, the critical condition to predict the morphology conversion from full conformation to wrinkling is established, which agrees well with the results of molecular dynamics simulations. This study has significant meanings for design and fabrication of high quality nanostructured coatings on substrates with complex surfaces, and can offer a guide for designing new functional graphene electronical devices such as nano-sensors and nano-switches as well.     

石墨烯基气凝胶的制备及油吸附性能研究进展

海上漏油的频繁发生以及采油废水、工业含油污水的大量排放造成水资源大片污染和生态系统平衡的严重破坏。目前，从水体中分离油品和有机污染物已受到越来越多的商业和学术的关注。石墨烯基气凝胶是由二维石墨烯片层组装成的三维宏观材料，因其孔隙率高、比表面积大、密度低、机械性能强等特点在油水分离领域具有广阔的应用前景，已成为当今的研究热点之一。本文结合最新研究进展系统地总结了石墨烯基气凝胶的结构设计、组装及干燥方法，归纳了近年来其在油水分离中的应用进展，并对石墨烯基气凝胶在油水分离领域的研究现状和未来研究方向做了简要评述，以期为该领域的深入探索提供新的视角。