Journal ArticleDOI
Carbon Aerogel Composites Prepared by Ambient Drying and Using Oxidized Polyacrylonitrile Fibers as Reinforcements
Reads0
Chats0
TLDR
Carbon fiber-reinforced carbon aerogel composites for thermal insulators were prepared by copyrolysis of resorcinol-formaldehyde (RF) aerogels reinforced by oxidized polyacrylonitrile (PAN) fiber felts without any obvious cracks.Abstract:
Carbon fiber-reinforced carbon aerogel composites (C/CAs) for thermal insulators were prepared by copyrolysis of resorcinol-formaldehyde (RF) aerogels reinforced by oxidized polyacrylonitrile (PAN) fiber felts. The RF aerogel composites were obtained by impregnating PAN fiber felts with RF sols, then aging, ethanol exchanging, and drying at ambient pressure. Upon carbonization, the PAN fibers shrink with the RF aerogels, thus reducing the difference of shrinkage rates between the fiber reinforcements and the aerogel matrices, and resulting in C/CAs without any obvious cracks. The three point bend strength of the C/CAs is 7.1 ± 1.7 MPa, and the thermal conductivity is 0.328 W m–1 K–1 at 300 °C in air. These composites can be used as high-temperature thermal insulators (in inert atmospheres or vacuum) or supports for phase change materials in thermal protection system.read more
Citations
More filters
Journal ArticleDOI
Recent advances in preparations and applications of carbon aerogels: A review
Jong-Hoon Lee,Soo-Jin Park +1 more
TL;DR: A brief overview of the history and fundamental concepts surrounding carbon aerogels and a comprehensive summary of recent developments for their application can be found in this article, where the authors present a comprehensive review of the application of carbon aeroglobels.
Journal ArticleDOI
Aramid fibers reinforced silica aerogel composites with low thermal conductivity and improved mechanical performance
TL;DR: In this article, aramid fibers reinforced silica aerogel composites (AF/aerogels) for thermal insulation were prepared successfully under ambient pressure drying, and the microstructure showed that the aramid fibers were inlaid in the Aerogel matrix, acting as the supporting skeletons, to strengthen the aerogels matrix.
Journal ArticleDOI
Polymer/graphene hybrid aerogel with high compressibility, conductivity, and "sticky" superhydrophobicity.
TL;DR: These outstanding properties qualify the PDMS/CGA composites developed here as promising candidates for a wide range of applications such as in sensors, actuators, and materials used for biochemical separation and tissue engineering.
Journal ArticleDOI
Carbonaceous hydrogels and aerogels for supercapacitors
Xi-Lin Wu,An-Wu Xu +1 more
TL;DR: In this paper, the authors give an overview of the recent advances in the use of novel carbonaceous gels for supercapacitors, including polymer derived carbon hydrogels and aerogels.
Journal ArticleDOI
Enhanced mechanical, thermal, and electric properties of graphene aerogels via supercritical ethanol drying and high-temperature thermal reduction.
TL;DR: The large BET surface areas, together with strong mechanical properties, low thermal conductivities, high thermal stability and electrical conductivities made these graphene aerogels feasible candidates for use in a number of fields covering from batteries to sensors, electrodes, lightweight conductor and insulation materials.
References
More filters
Journal ArticleDOI
Chemistry of Aerogels and Their Applications
Alain Pierre,Gerard Pajonk +1 more
TL;DR: Aerogels form a new class of solids showing sophisticated potentialities for a range of applications, and can develop very attractive physical and chemical properties not achievable by other means of low temperature soft chemical synthesis.
Journal ArticleDOI
Synthesis of Graphene Aerogel with High Electrical Conductivity
Marcus A. Worsley,Peter J. Pauzauskie,Tammy Y. Olson,Juergen Biener,Joe H. Satcher,Theodore F. Baumann +5 more
TL;DR: The synthesis of ultra-low-density three-dimensional macroassemblies of graphene sheets that exhibit high electrical conductivities and large internal surface areas are reported, making these materials viable candidates for use in energy storage, catalysis, and sensing applications.
Journal ArticleDOI
Preparation and Properties of Resorcinol–Formaldehyde Organic and Carbon Gels
TL;DR: A brief overview on the preparation and properties of resorcinol-formaldehyde organic and carbon gels reveals very interesting features about their structural and performance characteristics as mentioned in this paper, which leads to a remarkable potential for designing and tailoring these materials to fit specific applications.
Journal ArticleDOI
Hydrophobic nanocellulose aerogels as floating, sustainable, reusable, and recyclable oil absorbents.
TL;DR: By functionalizing the native cellulose nanofibrils of the aerogel with a hydrophobic but oleophilic coating, such as titanium dioxide, a selectively oil-absorbing material capable of floating on water is achieved.
Journal ArticleDOI
Nanoengineering Strong Silica Aerogels
TL;DR: In this article, the strength of silica aerogel monoliths was improved by cross-linking the nanoparticle building blocks of preformed silica hydrogels with poly(hexamethylene diisocyanate).