共查询到20条相似文献，搜索用时 15 毫秒
1.
Zehong Chen Hao Zhuo Yijie Hu Haihong Lai Linxiang Liu Linxin Zhong Xinwen Peng 《Advanced functional materials》2020,30(17)
Lightweight and elastic carbon materials have attracted great interest in pressure sensing and energy storage for wearable devices and electronic skins. Wood is the most abundant renewable resource and offers green and sustainable raw materials for fabricating lightweight carbon materials. Herein, a facile and sustainable strategy is proposed to fabricate a wood‐derived elastic carbon aerogel with tracheid‐like texture from cellulose nanofibers (CNFs) and lignin. The flexible CNFs entangle and assemble into an interconnected framework, while lignin with high thermal stability and favorable stiffness prevents the framework from severe structural shrinkage during annealing. This strategy leads to an ordered tracheid‐like structure and significantly reduces the thermal deformation of the CNFs network, producing a lightweight and elastic carbon aerogel. The wood‐derived carbon aerogel exhibits excellent mechanical performance, including high compressibility (up to 95% strain) and fatigue resistance. It also reveals high sensitivity at a wide working pressure range of 0–16.89 kPa and can detect human biosignals accurately. Moreover, the carbon aerogel can be assembled into a flexible and free‐standing all‐solid‐state symmetric supercapacitor that reveals satisfactory electrochemical performance and mechanical flexibility. These features make the wood‐derived carbon aerogel highly attractive for pressure sensor and flexible electrode applications. 相似文献
2.
Xiao Yang Zhenhua Li Hong Xiao Ning Wang Yanpu Li Xinyuan Xu Zhijun Chen Hong Tan Jianshu Li 《Advanced functional materials》2018,28(32)
A simple and universal method for manufacturing a mineralization coating on various surfaces is developed using a biofilm‐based material obtained from engineered curli nanofibers. The amyloid protein (CsgA) is the main proteinaceous component in the Escherichia coli (E. coli) biofilm, which can withstand detergents in the harsh environment. The peptide sequence DDDEEK is bioinspired from salivary acquired pellicles in the dental plaque biofilm, having a strong ability to absorb mineral ions and induce the formation of biominerals. The bioinspired coating is successfully secreted by the engineered E. coli, which is transformed with a recombinant plasmid for expression with T7 promoter (PET), namely PET‐22b‐CsgA‐DDDEEK plasmid. The uniform coating can bear shear force and stay on virtually any type of material surface for at least one month. Moreover, the coated slices had a good mineralization performance and better stability than hydroxyapatite (HA)‐spray slices. Furthermore, MG63 cells on the bioactive HA layer induced by the coating possess a better growth capacity than those on the commercial product Matrigel. The animal experiment results suggest that the coated Ti6Al4V screws with induced HA present better osteogenicity and osseointegration than HA‐sprayed screws after 12 weeks, as well as no extra immunogenicity. Thus, the coating is highly promising for biomedical applications. 相似文献
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Ramon Weishaupt Gilberto Siqueira Mark Schubert Michael M. Kämpf Tanja Zimmermann Katharina Maniura‐Weber Greta Faccio 《Advanced functional materials》2017,27(4)
Tracing heavy metals is a crucial issue in both environmental and medical samples. In this work, a sensing biomolecule, the cyanobacterial C‐phycocyanin (CPC), is integrated into a nanocellulose matrix, and with this, a biosensor for copper ions is developed. The assembly of CPC‐functionalized nanocellulose into a red‐fluorescent, copper‐sensitive hybrid film “CySense”, enhances protein stability and facilitates the reuse and the regeneration of the sensor for several cycles over 7 days. CySense is suitable for the analysis of complex medical samples such as human serum filtrate. The reported biosensor reliably detects copper ion contents with a lower detection limit of 200 × 10?9m and an IC50 of 4.9 × 10?6m as changes in fluorescence emission intensity that can be measured with a fluorimeter or a microarray laser scanner. 相似文献
5.
Structural energy storage materials refer to a broad category of multifunctional materials which can simultaneously provide load bearing and energy storage to achieve weight reduction in weight‐sensitive applications. Reliable and satisfactory performance in each function, load bearing or energy storage, requires peculiar material design with potential trade‐offs between them. Here, the trade‐offs between functionalities in an emerging class of nanomaterials, carbon nanofibers (CNFs), are unraveled. The CNFs are fabricated by emulsion and coaxial electrospinning and activated by KOH at different activation conditions. The effect of activation on supercapacitor performance is analyzed using two electrode test cells with aqueous electrolyte. Porous CNFs show promising energy storage capacity (191.3 F g?1 and excellent cyclic stability) and load‐bearing capability (σf > 0.55 ± 0.15 GPa and E > 27.4 ± 2.6 GPa). While activation enhances surface area and capacitance, it introduces flaws in the material, such as nanopores, reducing mechanical properties. It is found that moderate activation can lead to dramatic improvement in capacitance (by >300%), at a rather moderate loss in strength (<17%). The gain in specific surface area and capacitance in CNFs is many times those observed in bulk carbon structures, such as carbon fibers, indicating that activation is mainly effective near the free surfaces and for low‐dimensional materials. 相似文献
6.
Li‐Feng Chen Zhi‐Hong Huang Hai‐Wei Liang Huai‐Ling Gao Shu‐Hong Yu 《Advanced functional materials》2014,24(32):5104-5111
Recently, heteroatom‐doped three‐dimensional (3D) nanostructured carbon materials have attracted immense interest because of their great potential in various applications. Hence, it is highly desirable to exploit a simple, renewable, scalable, multifunctional, and general strategy to engineer 3D heteroatom‐doped carbon nanomaterials. Herein, a simple, eco‐friendly, general, and effective way to fabricate 3D heteroatom‐doped carbon nanofiber networks on a large scale is reported. Using this method, 3D P‐doped, N,P‐co‐doped, and B,P‐co‐doped carbon nanofiber networks are successfully fabricated by the pyrolysis of bacterial cellulose immersed in H3PO4, NH4H2PO4, and H3BO3/H3PO4 aqueous solution, respectively. Moreover, the as‐prepared N,P‐co‐doped carbon nanofibers exhibit good supercapacitive performance. 相似文献
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Marjo Kettunen Riitta J. Silvennoinen Nikolay Houbenov Antti Nykänen Janne Ruokolainen Jani Sainio Viljami Pore Marianna Kemell Mikael Ankerfors Tom Lindström Mikko Ritala Robin H. A. Ras Olli Ikkala 《Advanced functional materials》2011,21(3):510-517
Chemical vapor deposition of a thin titanium dioxide (TiO2) film on lightweight native nanocellulose aerogels offers a novel type of functional material that shows photoswitching between water‐superabsorbent and water‐repellent states. Cellulose nanofibrils (diameters in the range of 5–20 nm) with native crystalline internal structures are topical due to their attractive mechanical properties, and they have become relevant for applications due to the recent progress in the methods of their preparation. Highly porous, nanocellulose aerogels are here first formed by freeze‐drying from the corresponding aqueous gels. Well‐defined, nearly conformal TiO2 coatings with thicknesses of about 7 nm are prepared by chemical vapor deposition on the aerogel skeleton. Weighing shows that such TiO2‐coated aerogel specimens essentially do not absorb water upon immersion, which is also evidenced by a high contact angle for water of 140° on the surface. Upon UV illumination, they absorb water 16 times their own weight and show a vanishing contact angle on the surface, allowing them to be denoted as superabsorbents. Recovery of the original absorption and wetting properties occurs upon storage in the dark. That the cellulose nanofibrils spontaneously aggregate into porous sheets of different length scales during freeze‐drying is relevant: in the water‐repellent state they may stabilize air pockets, as evidenced by a high contact angle, in the superabsorbent state they facilitate rapid water‐spreading into the aerogel cavities by capillary effects. The TiO2‐coated nanocellulose aerogels also show photo‐oxidative decomposition, i.e., photocatalytic activity, which, in combination with the porous structure, is interesting for applications such as water purification. It is expected that the present dynamic, externally controlled, organic/inorganic aerogels will open technically relevant approaches for various applications. 相似文献
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Wenxin Cao Lei Yang Xiaodong Qi Ying Hou Jiaqi Zhu Ming Yang 《Advanced functional materials》2017,27(34)
Coaxial fibers are the key elements in many optical, electrical, and biomedical applications. Recent success in materials synthesis has provided versatile choices for the core part, but the search of high‐performance sheath materials remains much less productive. These surface coatings are however as important as the core for their role as protection layers and interaction medium with the externals, thereby critically affecting the real performance of coaxial fibers. Here it is shown that aramid nanofibers (ANFs) with exceptional environmental stability and mechanical properties can be advanced coating materials for both wet‐ and dry‐spun carbon nanotube (CNT) wires. Co‐wet‐spinning ANFs with CNT aqueous dispersion can produce coaxial fibers with a compact sheath comprised of aligned ANFs, showing much enhanced mechanical properties by transferring stress to the sheath without sacrificing the conductivity. On the other hand, an immersion‐precipitation process is used to prepare a porous sheath made from randomly distributed nanofibers on dry‐spun CNT wires, which can be combined with ionic conductive gel electrolyte as a strong packaging layer for flexible solid‐state supercapacitors. The excellent intrinsic characteristics as well as variable ways of structural organizations make ANF‐based coatings an attractive tool for the design of multifunctional high‐performance hybrid materials. 相似文献
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Ziying He Chenxi Zhang Zhenxing Zhu Yaxiong Yu Chao Zheng Fei Wei 《Advanced functional materials》2024,34(48):2408285
Silicon-based anode has high theoretical capacity but suffers from poor electrical conductivity, large volume expansion, and unstable solid electrolyte interphase (SEI). Adding carbon nanotubes (CNTs) and carbon coatings are both very effective methods for addressing the above issues. The intrinsic sp2 covalent structure endows CNTs with excellent electrical conductivity, mechanical strength, and chemical stability, which makes them suitable for various energy storage applications, such as in lithium-ion batteries (LIBs). Apart from the conductive network, CNTs can serve as current collectors, mechanical probes, and mechanical frameworks, and they have potential in the construction of next-generation battery architectures. Carbon coatings are mixed ionic-electronic conductors with good chemical stability that provide mechanical support and mitigate the volume expansion of Si-based materials. This review outlines the advances in CNTs and carbon coatings as conductive networks in Si-based anodes, as well as insights into their future development. It provides an in-depth analysis of the percolation and mechanical mechanism of conductive networks, highlights the importance of flexible long-range conductivity, and decouples the relationships between stress, interface stability, and electron/ion transfer. 相似文献
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Qiu Gen Zhang Chao Deng Faizal Soyekwo Qing Lin Liu Ai Mei Zhu 《Advanced functional materials》2016,26(5):792-800
There are increasing requirements for highly efficient and solvent‐resistant nanoporous membranes in various separation processes. Traditional membranes usually have a poor solvent resistance and a thick skin layer leading to a low permeation flux. Currently, the major challenge lies in fabrication of ultrathin few‐nanometers‐pore membranes for fast organic filtration. Herein, a facile approach is presented to prepare ultrafine cellulose nanofibers for fabrication of ultrathin nanoporous membranes. The obtained nanofibers have a uniform diameter of 7.5 ± 2.5 nm and are homogeneously dispersed in aqueous solutions that are favorable to the fabrication of ultrathin nanoporous membranes. The resulting cellulose nanoporous membranes have an adjustable thickness down to 23 nm and pore sizes ranging from 2.5 to 12 nm. They allow fast permeation of water and organics during pressure‐driven filtration. Typically, the 30 nm thick membrane has high fluxes of 1.14 and 3.96 × 104 L h?1 m?2 bar?1 for pure water and acetone respectively. Furthermore, the as‐prepared cellulose nanofibers are easily employed to produce a novel syringe filter with sub‐10 nm pores that have a wide application in fast separation and purification of nanoparticles on few‐nanometers scale. 相似文献
11.
Bi-Cheng Hu Hao-Ran Zhang Si-Cheng Li Wen-Shuai Chen Zhen-Yu Wu Hai-Wei Liang Hai-Peng Yu Shu-Hong Yu 《Advanced functional materials》2023,33(1):2207532
Aerogels, a type of fascinating material with very low density and high surface area, show many unique properties and unlimited applications. To boost their practical applications, it is necessary to develop efficient, controllable, and low-cost methods to produce high-performance aerogels on a large-scale, preferably in a sustainable way. Here, a general strategy is reported for controllable fabrication of a family of carbonaceous nanofiber aerogels (CNFAs) by biomass-derived nanofibers template-directed hydrothermal carbonization method. Abundant functional groups are exposed on the surface of the prepared carbonaceous nanofibers. Importantly, in contrast to traditional nature biopolymer-based aerogels, a superior combination of good recoverability and high strength is achieved for the CNFAs by adjusting the synthetic parameters. The successful synthesis of such fascinating materials provides an excellent platform for design and construction of devices for fast water treatment. The synthetic strategy and sustainable concept presented in this work will open a new way to prepare advanced aerogels with unique properties for wide applications. 相似文献
12.
碳纳米管制备及其生长机制研究 总被引：1，自引：0，他引：1
采用乙醇催化燃烧法，以钴盐作为催化剂先体、薄铜片作为基底制备碳纳米管。分别以氯化钴、硝酸钴和硫酸钴作为催化剂先体，研究了不同催化剂先体对碳纳米管生长的影响；利用扫描电镜，透射电镜对碳纳米材料的形貌和结构进行了表征，研究了不同钴盐的催化剂先体对碳纳米管形态与结构的影响，讨论了碳纳米管的生长机制。实验发现，其他制备条件相同，当催化剂先体为氯化钴时，碳纳米管与大量絮状杂质缠绕在一起；当催化剂先体为硝酸钴时，碳纳米管容易形成弯曲、不规则的波浪形结构；而当催化剂先体为硫酸钴时，实验所得的碳纳米材料几乎全为取向规则、直径均一的碳纳米纤维，只观察到少量碳纳米管。 相似文献
13.
采用乙醇催化燃烧法,以钴盐作为催化剂先体、薄铜片作为基底制备碳纳米管。分别以氯化钴、硝酸钴和硫酸钴作为催化剂先体,研究了不同催化剂先体对碳纳米管生长的影响;利用扫描电镜,透射电镜对碳纳米材料的形貌和结构进行了表征,研究了不同钴盐的催化剂先体对碳纳米管形态与结构的影响,讨论了碳纳米管的生长机制。实验发现,其他制备条件相同,当催化剂先体为氯化钴时,碳纳米管与大量絮状杂质缠绕在一起;当催化剂先体为硝酸钴时,碳纳米管容易形成弯曲、不规则的波浪形结构;而当催化剂先体为硫酸钴时,实验所得的碳纳米材料几乎全为取向规则、直径均一的碳纳米纤维,只观察到少量碳纳米管。 相似文献
14.
以不同浓度的FeCl3溶液作为催化剂先体,利用乙醇催化燃烧法,在铜片上生长出了碳纳米管和碳纳米纤维。讨论了不同浓度的FeCl3催化剂先体对生长碳纳米材料产物和形貌的影响。利用扫描电镜,透射电镜和喇曼光谱对样品的形貌和结构进行了表征。实验结果表明,随着催化剂先体浓度增大,碳纳米材料产量增大,直径呈现增大趋势,其直径范围也逐渐变大。当催化剂先体浓度为0.01mol/L时,可以制备出直径较小的碳纳米管;当催化剂先体浓度为0.1mol/L时,可以制备出直径分布均匀的碳纳米管与碳纳米纤维的混合物;当催化剂先体浓度为1mol/L时,可以制备出直径分布不均匀的碳纳米纤维。 相似文献
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以不同浓度的FeCl3溶液作为催化剂先体，利用乙醇催化燃烧法，在铜片上生长出了碳纳米管和碳纳米纤维。讨论了不同浓度的FeCl3催化剂先体对生长碳纳米材料产物和形貌的影响。利用扫描电镜，透射电镜和喇曼光谱对样品的形貌和结构进行了表征。实验结果表明，随着催化剂先体浓度增大，碳纳米材料产量增大，直径呈现增大趋势，其直径范围也逐渐变大。当催化剂先体浓度为0.01mol/L时，可以制备出直径较小的碳纳米管；当催化剂先体浓度为0.1mol/L时，可以制备出直径分布均匀的碳纳米管与碳纳米纤维的混合物；当催化剂先体浓度为1mol/L时，可以制备出直径分布不均匀的碳纳米纤维。 相似文献
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Nan Sheng Peng Ji Minghao Zhang Zhuotong Wu Qianqian Liang Shiyan Chen Huaping Wang 《Advanced Electronic Materials》2021,7(4):2001235
With the rise of wearable devices, flexible sensors have received extensive attention and research due to their great potential in human health detection and joint motion. Here, a flexible fiber strain sensor is directly obtained by a common wet-spinning method, which used thermoplastic polyurethane as the elastomer, carbon nanotubes, and graphene as conductive fillers by incorporating 2,2,6,6-tetramethylpiperidine-1-oxyl oxidized bacterial cellulose nanofibers (BCN) as the dispersant and binding agent. The introduction of BCN can effectively improve the interaction between the polymer matrix and the conductive fillers, and bear a part of the tensile stress and the supporting force during the fiber formation, to form the porous structure, which can efficiently carry and transfer the tensile force. Under the synergistic effect of various components, the fiber strain sensor with wide response range (230%), high gauge factor values of 17.8 (0−70%), 326.6 (70−150%), and 1501.0 (150−230%), fast response time, and recovery time (≈100 ms), and long-term cyclic stability (>10 000 cycles) are prepared. In the fiber sensor, the ideal combination of excellent strain sensing performance and flexible wearable characteristics has been realized which will be of great significance in the field of weaving, lightweight, and foldable electronic devices. 相似文献
17.
Pietro Cataldi Marco Cassinelli Jos A. Heredia‐Guerrero Susana Guzman‐Puyol Sara Naderizadeh Athanassia Athanassiou Mario Caironi 《Advanced functional materials》2020,30(3)
The materials commonly used to fabricate thermoelectric devices are tellurium, lead, and germanium. These materials ensure the best thermoelectric performance, but exhibit drawbacks in terms of availability, sustainability, cost, and manufacturing complexity. Moreover, they do not guarantee a safe and cheap implementation in wearable thermoelectric applications. Here, p‐Type and n‐type flexible thermoelectric textiles are produced with sustainable and low‐cost materials through green and scalable processes. Cotton is functionalized with inks made with biopolyester and carbon nanomaterials. Depending on the nanofiller, i.e., graphene nanoplatelets, carbon nanotubes, or carbon nanofibers, positive or negative Seebeck coefficient values are obtained, resulting in a remarkable electrical conductivity value of 55 S cm?1 using carbon nanotubes. The best bending and washing stability are registered for the carbon nanofiber‐based biocomposites, which increase their electrical resistance by 5 times after repeated bending cycles and only by 30% after washing. Finally, in‐plane flexible thermoelectric generators coupling the best p‐ and n‐type materials are fabricated and analysed, resulting in an output voltage of ≈1.65 mV and a maximum output power of ≈1.0 nW by connecting only 2 p/n thermocouples at a temperature difference of 70 °C. 相似文献
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Michael K. Hausmann Gilberto Siqueira Rafael Libanori Dimitri Kokkinis Antonia Neels Tanja Zimmermann Andr R. Studart 《Advanced functional materials》2020,30(4)
Cellulose is an attractive material resource for the fabrication of sustainable functional products, but its processing into structures with complex architecture and high cellulose content remains challenging. Such limitation has prevented cellulose‐based synthetic materials from reaching the level of structural control and mechanical properties observed in their biological counterparts, such as wood and plant tissues. To address this issue, a simple approach is reported to manufacture complex‐shaped cellulose‐based composites, in which the shaping capabilities of 3D printing technologies are combined with a wet densification process that increases the concentration of cellulose in the final printed material. Densification is achieved by exchanging the liquid of the wet printed material with a poor solvent mixture that induces attractive interactions between cellulose particles. The effect of the solvent mixture on the final cellulose concentration is rationalized using solubility parameters that quantify the attractive interparticle interactions. Using X‐ray diffraction analysis and mechanical tests, 3D printed composites obtained through this process are shown to exhibit highly aligned microstructures and mechanical properties significantly higher than those obtained by earlier additively manufactured cellulose‐based materials. These features enable the fabrication of cellulose‐rich synthetic structures that more closely resemble the exquisite designs found in biological materials grown by plants in nature. 相似文献