静电纺丝和炭化法制备纳米纤维素储能材料研究进展

为促进纳米纤维素材料在储能领域的应用,综述了以其为原料,采用静电纺丝和炭化技术以及2种方法结合制备用于电池和超级电容器等电极材料和隔膜材料的工艺。通过分析发现:静电纺纳米纤维素材料具有电化学性能优异、柔性较好等优点,可用作增强材料与导电材料复合使用;炭化处理纳米纤维素材料具有独特微孔结构,比表面积大等特点,其存在的形态主要有气凝胶、纳米纤维膜及薄膜等;重点分析了2种方法叠加制备纳米纤维素材料在储能领域应用中存在的问题;提出构建环保、形态结构多样的天然基材储能器件是未来的发展方向,指出静电纺丝和炭化制备纳米纤维素材料在柔性储能器件和小巧型移动端储能设备中具有较好应用前景。     

多孔性纳米纤维素膜的制备及应用综述

首先简述了纳米纤维素膜的孔结构及其表征方法;然后以制备工艺为主线,详细论述了纳米纤维素制备、悬浮液配制,纳米纤维素膜制备对纳米纤维素膜多孔结构的影响;最后综述了多孔性纳米纤维素膜在导电储能材料、分离材料、吸附材料领域的应用。为了拓宽其应用领域,满足应用要求,采用单一的调孔方式具有一定局限性,将多种方式相结合制备特定孔结构的纳米纤维素膜,并复合其他材料制备功能性的多孔性纳米纤维素膜是未来的发展方向。     

不同维度纳米纤维素基复合材料的制备及其在储能器件中的应用

纳米纤维素是一种可持续的绿色纳米材料,独特的结构使其成为发展下一代高效、环保储能器件的新选择。采用原位聚合、共混、层层自组装等方法可将纳米纤维素与碳材料、导电高分子、无机纳米粒子、过渡金属氧化物等光电材料复合形成具有导电和储能效应的多功能纳米复合材料。本文对不同维度的纳米纤维素基复合材料的制备方法及其在储能器件中应用的最新研究进展进行了综述并介绍了纳米纤维素基复合材料在储能领域未来发展中亟待解决的问题和发展方向及重点。     

纤维素基纳米复合材料在储能领域的应用研究进展

纳米纤维素是一种通过物理、化学或生物手段从原纤维材料中分离出的直径为纳米级的纤维素材料。因制备工艺的不同,纳米纤维素材料具有不同的性质特点,在未来储能领域具有更加广阔的应用前景。本文概述了近年来各类纳米纤维素基复合材料在储能领域的新进展（包括超级电容器、锂离子电池（LIB）、锂硫（Li-S）电池）,并展望了其发展前景。     

制备纳米纤维素基复合相变材料的研究进展

相变储能是解决目前能源短缺的一种有效方式,相变材料（PCM）在相变过程中具有较大的储热容量,并在接近恒温的状态下具有潜在的热能存储能力。纳米纤维素是一种具有纳米级尺寸、较高热稳定性、丰富的亲水性羟基和表面活性位点的材料,作为复合相变材料的基材具有广泛的应用前景。本研究针对相变材料在相变过程中易泄漏和形状不稳定等问题,围绕纳米纤维素在复合相变材料中的作用,综述了纳米纤维素基气凝胶、纳米纤维素基微胶囊和其他纳米纤维素基复合相变材料的制备方法,展望了纳米纤维素基复合相变材料未来的研究方向。     

纳米纤维素自愈合材料的研制

选用机械力化学法制备纳米纤维素,使其内部氢键断裂,减少团聚效应.通过双醛纳米纤维素中的醛基与明胶中的氨基、羧基反应形成氢键及酰胺键,以此构筑出拥有超分子结构的自愈合材料.自愈合材料的成型速度快,在40 s内便能完成制备;纳米纤维素与明胶均无毒无害,生物相容性好,拓宽了自愈合材料的应用.     

纳米纤维素基气凝胶的制备及其吸附分离应用研究进展

纤维素基功能材料的产业化是传统造纸行业转型升级的重要发展方向。纳米纤维素基气凝胶是一种基于纳米纤维素制备而成的轻质固体材料,具有孔隙率高、比表面积大、低密度和可生物降解等优点,在吸附分离领域有广泛的应用。本文对纳米纤维素基气凝胶的制备方法进行了总结,探讨了制备过程对纳米纤维素基气凝胶结构的影响,综述了纳米纤维素基气凝胶在吸附分离领域中的应用进展,并展望了其应用前景。     

纳米纤维素基2D/3D重金属吸附材料的研究进展

本文综述了通过氨基、羧基、硫醇基等官能团改性纳米纤维素以及纳米纤维素和其他材料复合,制备成2D膜材料和3D凝胶材料的方法及其性能,同时也介绍了其在水环境中去除重金属离子的应用进展,并对纳米纤维素基吸附剂的制备和应用进行了展望.     

纳米纤维素的制备策略及应用实践

纳米材料因其具有比表面积大、力学强度高、热性能好等独特优势,还具有原料可再生、产品可降解、生物相容性好等特点,因此成为研究的热点。对纤维素纳米晶体(CNC)、纤维素纳米纤丝(CNF)和细菌纳米纤维素(BNC)3种主要纳米纤维素的结构特征,不同纳米纤维素的制备策略作了介绍,结合纸基材料、复合材料、储能材料、医学材料等领域的发展现状,综述纳米纤维素在新兴领域的应用研究进展,并对纳米纤维素的未来发展趋势进行展望。     

纳米纤维素基血液接触性材料研究进展

纳米纤维素是在某一尺度上具有纳米级的纤维素材料,其具有优异的力学性能和良好的生物相容性,在血液接触性材料领域得到了迅速的发展。纳米纤维素材料具有可控的血液相容性,作为抗凝血材料和促凝血材料具有广泛的应用前景。本文讨论了纳米纤维素基血液接触性材料的制备方法,总结了其在抗凝血与促凝血中的应用,并就其未来应用进行了展望。     

High-value Applications of Nanocellulose

Nanocelluloses, obtained from the biopolymer cellulose, are a class of renewable functional nanomaterials with excellent properties and a broad range of applications. This review mainly illustrates practical and advanced applications of nanocellulose-based materials in the following categories. ① Fire-resistant materials: in the section on these types of materials, the fire-protection property of nanocellulose/clay hybrid composites (clay nanopaper) is illustrated; oriented montmorillonite (MTM) provides barrier properties and low thermal conductivity whereas cellulose nanofibers (CNFs) impart favorable charring. ② Thermal insulation materials: the best way to obtain materials with good heat insulation performance is to decrease the thermal conductivity of such materials. ③ Template materials: nanocellulose can direct the deposition and patterning of materials to form nanoparticles, nanowires, or nanotubes with improved properties.     

纳米纤维素增强复合材料的研究与开发现状

纳米纤维素是一种新型纳米材料,具有生物可降解性能,且强力高于普通的钢材或芳香族聚酰胺(Kevlar~?),因具有良好的透明性、吸湿性以及导电性在业内受到广泛关注。本文介绍了纳米纤维素的技术特征、研究与开发现状,并对纳米纤维素复合材料的应用和潜在市场作深入分析。     

Multifunctional nanocellulose/metal and metal oxide nanoparticle hybrid nanomaterials

Abstract

Nanocellulose materials are derived from cellulose, the most abundant biopolymer on the earth. Nanocellulose have been extensively used in the field of food packaging materials, wastewater treatment, drug delivery, tissue engineering, hydrogels, aerogels, sensors, pharmaceuticals, and electronic sectors due to their unique chemical structure and excellent mechanical properties. On the other hand, metal and metal oxide nanoparticles (NP) such as Ag NP, ZnO NP, CuO NP, and Fe₃O₄ NP have a variety of functional properties such as UV-barrier, antimicrobial, and magnetic properties. Recently, nanocelluloses materials have been used as a green template for producing metal or metal oxide nanoparticles. As a result, multifunctional nanocellulose/metal or metal oxide hybrid nanomaterials with high antibacterial properties, ultraviolet barrier properties, and mechanical properties were prepared. This review emphasized recent information on the synthesis, properties, and potential applications of multifunctional nanocellulose-based hybrid nanomaterials with metal or metal oxides such as Ag NP, ZnO NP, CuO NP, and Fe₃O₄ NP. The nanocellulose-based hybrid nanomaterials have huge potential applications in the area of food packaging, biopharmaceuticals, biomedical, and cosmetics.     

Progress in Nanocellulose Preparation and Application

Nanocellulose is a biodegradable, renewable, nonmeltable polymeric material that is insoluble in most solvents due to hydrogen bonding and crystallinity. Nanocellulose has attracted considerable attention in recent decades owing to its environmental friendliness, wide availability, good biocompatibility, high crystallinity, and high Young’s modulus. This review presents the recent achievements in preparation and applications of nanocellulose, including a discussion of the advantages and disadvantages of various preparation methods and a summary of the applications of nanocellulose in composite materials research. Finally, we examine the mounting evidence of more widespread potential applications of nanocellulose.     

纤维素的研究进展

纤维素是自然界最丰富的有机高分子,具有可再生、绿色和生物相容性,不仅在制浆造纸产品中得到大宗应用,也是化学化工的重要基础原材料。本文主要对纤维素的溶解、化学改性、纳米纤维素制备和纤维素/纳米纤维素新材料等方面的研究进展进行了综述。     

Structure and properties of nanocomposite films based on sodium caseinate and nanocellulose fibers

Films made from sodium caseinate and nanocellulose were prepared by dispersing the fibrils into film forming solutions, casting and drying. Composite films were less transparent and had a more hydrophilic surface than neat sodium caseinate ones. However, the global moisture uptake was almost not affected by filler concentration. Addition of nanocellulose to the neat sodium caseinate films produced an initial increase in the barrier properties to water vapor, and then, it decreases as filler content increased. This was explained in terms of additional detrimental changes (cracks and bubble formation) induced in the morphological structure of the film by the reinforcement.The tensile modulus and strength of composite films increased significantly with increasing cellulose concentrations, while the values of elongation decreased. In the same way it was found that the storage modulus increases considerably with filler addition in the low temperature range (<60 °C), though the effect of temperature on the films performance is even more dramatic, as expected in protein-based materials.     

纳米纤维素增强可生物降解聚合物的研究进展

本文综述了纤维素纳米晶体(CNC)和纤维素纳米纤丝(CNF)在增强可生物降解聚合物中的研究进展.主要介绍了两种纳米纤维素及其制备方法,阐述了纳米纤维素的增强机理和复合材料的构筑方法,详细论述了纳米纤维素在增强聚乳酸(PLA)、热塑性淀粉(TPS)、聚己内酯(PCL)应用的研究进展.最后简要分析了纳米纤维素增强可生物降解...     

基于壳聚糖的抗氧化复合材料制备及其在食品包装中的应用

本文以壳聚糖为主体材料,在其侧链接枝天然的具有抗氧化作用的芳胺类化合物腺嘌呤来增加它的抗氧化活性,并选用具有更高长径比的纳米纤维素掺杂制备高强度的改性壳聚糖复合膜。通过红外光谱、核磁共振碳谱和元素分析对改性壳聚糖进行结构鉴定,证明了腺嘌呤的接枝成功。抗氧化实验结果表明,腺嘌呤改性后的壳聚糖膜抗氧化活性得到显著提升,DPPH自由基清除率能达到72.20%,而纳米纤维素的掺杂增加了壳聚糖膜的机械性能和尺寸稳定性,MCBC-CNF-2膜的拉伸强度能达到65.06MPa,吸水率和溶胀率分别仅为36.20%和6.06%,尽管随着纳米纤维素掺杂量的增加,改性壳聚糖膜的抗氧化活性有所降低,但MCBC-CNF-2膜的DPPH自由基清除率仍能达到54.20%。这种全生物质膜科生物降解并且成本较低,有望应用于食品包装材料。