Naturally Dried Graphene Aerogels with Superelasticity and Tunable Poisson's Ratio

Xu, Xiang; Zhang, Qiangqiang; Yu, Yikang; Chen, Wen Li; Hu, Han; Li, Hui

doi:10.1002/adma.201603079

Cited by 264 publications

(231 citation statements)

References 56 publications

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“…[174] They started from GO in an ethylenediamine aqueous solution. [175][176][177] Thei nterested reader can find am ore detailed overview on aerogels made from CNTs and graphene elsewhere. This material shows an outstandingly reversible compressibility,r ecovering fully after a9 0% compression.…”

Section: Gels From Carbon Nanostructuresmentioning

confidence: 99%

“…Further studies on graphene aerogels focused on the investigation of the gel-formation mechanism, the applicability as supercapacitors,a nd the extraordinary mechanical properties,r espectively. [175][176][177] Thei nterested reader can find am ore detailed overview on aerogels made from CNTs and graphene elsewhere. [178][179][180][181]…”

Section: Gels From Carbon Nanostructuresmentioning

confidence: 99%

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Modern Inorganic Aerogels

et al. 2017

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Essentially, the term aerogel describes a special geometric structure of matter. It is neither limited to any material nor to any synthesis procedure. Hence, the possible variety of materials and therefore the multitude of their applications are almost unbounded. In fact, the same applies for nanoparticles. These are also just defined by their geometrical properties. In the past few decades nano-sized materials have been intensively studied and possible applications appeared in nearly all areas of natural sciences. To date a large variety of metal, semiconductor, oxide, and other nanoparticles are available from colloidal synthesis. However, for many applications of these materials an assembly into macroscopic structures is needed. Here we present a comprehensive picture of the developments that enabled the fusion of the colloidal nanoparticle and the aerogel world. This became possible by the controlled destabilization of pre-formed nanoparticles, which leads to their assembly into three-dimensional macroscopic networks. This revolutionary approach makes it possible to use precisely controlled nanoparticles as building blocks for macroscopic porous structures with programmable properties.

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Section: Gels From Carbon Nanostructuresmentioning

confidence: 99%

Section: Gels From Carbon Nanostructuresmentioning

confidence: 99%

Modern Inorganic Aerogels

et al. 2017

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“…Lightweight and elastic carbon material is one of the most important candidates for developing high‐performance flexible and wearable energy storage and sensing devices owing to its various advantages, including thermal and chemical stability, low density, and high electrical conductivity 3,4. In recent years, a series of elastic carbon aerogels with low density and high porosity has been synthesized from nanocarbons such as graphene,5–7 graphene oxide (GO),8,9 carbon nanotube (CNT)10–12 or their composites 13–15. These carbon aerogels show good mechanical robustness, elasticity, and high conductivity, demonstrating their important applications in wearable sensors, electronic skins, and flexible energy storage devices.…”

Section: Introductionmentioning

confidence: 99%

Wood‐Derived Lightweight and Elastic Carbon Aerogel for Pressure Sensing and Energy Storage

Chen

Zhuo

et al. 2020

Adv Funct Materials

204

142

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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.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201910292. important applications in wearable sensors, electronic skins, and flexible energy storage devices. Although carbon aerogels with good mechanical performances can be achieved from nanocarbon unites, their carbon precursors are nonrenewable, and the synthesis process of CNT, graphene, or their aerogels is high-cost and complicated.Considering the natural abundance, renewability, environmental friendliness, and low cost, biomass has been regarded as a renewable and sustainable carbon precursor for fabricating carbon aerogels. Up to now, several biomass-derived carbon aerogels have been successfully developed from gelatin, [16] winter melon, [17] protein, [18] bacterial cellulose, [19] and raw cotton. [20] However, those carbon aerogels show poor compressibility, elasticity, and fatigue resistance owing to the intrinsic random porous architecture and severe volume shrinkage at annealing or carbonization. Wood, as one of the most abundant biomass resources, demonstrates hierarchical tracheid structure that is composed of CNFs and amorphous matrix (lignin and hemicelluloses). [21] Owing to the compact structure (large amounts of additives and various interaction among tracheids or CNFs), natural wood is rigid and the tracheids are hard to be compressed and easily collapsed. Therefore, fabricating compressible and elastic conductive carbon aerogel from original wood tracheids is challenging. To solve this problem, Hu et al. [22] put forward a "top-down" stra...

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“…[173] Dieses Material, auch bekannt als Aerographen, ist elektrisch leitfähig,h at eine hohe Absorptionskapazitätu nd zeigt ausgezeichnete temperaturunabhängige Elastizität. [175][176][177] Der interessierte Leser kann an anderer Stelle eine detaillierte Übersicht über Aerogele aus CNTs und Graphen finden. [174] Sie startete mit GO in einer wässrigen Ethylendiaminlçsung.…”

Section: Gele Aus Kohlenstoffnanostrukturenunclassified

“…Weitere Arbeiten an Graphenaerogelen konzentrierten sich auf die Untersuchung der Gelbildungsmechanismen, die Anwendbarkeit als Superkondensatoren und die außergewçhnlichen mechanischen Eigenschaften. [175][176][177] Der interessierte Leser kann an anderer Stelle eine detaillierte Übersicht über Aerogele aus CNTs und Graphen finden. [178][179][180][181]…”

Section: Gele Aus Kohlenstoffnanostrukturenunclassified

Moderne Anorganische Aerogele

et al. 2017

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Der Begriff Aerogel beschreibt im Wesentlichen eine besondere geometrische Struktur der Materie, die materialunabhängig ist und keinem speziellen Syntheseverfahren unterliegt. Grundsätzlich können daher Aerogele aus unzähligen Materialien bestehen, wodurch die Anwendungsmöglichkeiten nahezu unbegrenzt sind. Dasselbe trifft auf Nanopartikel zu. Diese werden ebenso durch ihre geometrischen Eigenschaften definiert. In den letzten Jahrzehnten standen daher nanoskalige Materialien im Fokus der Forschung, und es entwickelten sich mögliche Anwendungen in vielen naturwissenschaftlichen Bereichen. Heute ist eine Vielzahl an Metall‐, Halbleiter‐, Oxid‐ und anderen Nanopartikeln durch kolloidale Synthesen zugänglich. Dennoch ist es für eine Anwendung oft notwendig, dass diese Materialien zuvor in makroskopische Strukturen angeordnet werden. Dieser Aufsatz gibt eine ausführliche Übersicht über die Entwicklung, die die Welt der kolloidalen Nanopartikel und der Aerogele miteinander vereint. Ermöglicht wurde dies durch die kontrollierte Destabilisierung der vorab gebildeten Nanopartikel, die zu einer Anordnung der Nanopartikel zu einem dreidimensionalen, makroskopischen Netzwerk führt. Dieses revolutionäre Konzept verleiht die Möglichkeit, präzise kontrollierte Nanopartikel als Grundbausteine für makroskopische, poröse Strukturen mit einstellbaren Eigenschaften zu nutzen.

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Naturally Dried Graphene Aerogels with Superelasticity and Tunable Poisson's Ratio

Cited by 264 publications

References 56 publications

Modern Inorganic Aerogels

Modern Inorganic Aerogels

Wood‐Derived Lightweight and Elastic Carbon Aerogel for Pressure Sensing and Energy Storage

Moderne Anorganische Aerogele

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