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Wang, J.; Glora, M.; Petričević, R.; Saliger, R.; Proebstle, H.; Fricke, J.

doi:10.1023/a:1009607211736

Cited by 37 publications

(11 citation statements)

References 11 publications

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“…Acidic and basic catalysts affect differently the morphology of the produced gels at the same M and R/C ratios. Whereas the primary particles of the base‐catalyzed aerogels are arranged in clusters with an extent of several microns,120 their acid‐catalyzed equivalents look like perfect spheres arranged in branching chains 22. The effect of basic or acidic catalysts on the gel properties is believed to be due to their effect on the pH of the solution.…”

Section: Factors Affecting the Properties Of The Wet Gelmentioning

confidence: 99%

Advances in Tailoring Resorcinol‐Formaldehyde Organic and Carbon Gels

2011

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An overview on the preparation and properties of resorcinol-formaldehyde (RF) organic and carbon gels reveals the fascinating and remarkably flexible properties of RF carbon and organic gels and how these properties are related to the synthesis and processing conditions. The structural properties can be easily tailored by rigidly controlling such conditions. However, slight variations in some conditions may cause drastic variations in the structural characteristics, and hence properties. Therefore, the effects of different conditions must be well-understood before attempting to tailor organic or carbon gels to specific applications. The most important factors that affect the properties of an organic gel are the precursor concentrations, the catalyst type and concentration, the time and temperature of curing, and the drying method. In addition to these factors, characteristics of activated carbon gels also depend on the pyrolysis temperature and the activation method. These conditions impact the structural and performance characteristics significantly.

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Section: Factors Affecting the Properties Of The Wet Gelmentioning

confidence: 99%

Advances in Tailoring Resorcinol‐Formaldehyde Organic and Carbon Gels

2011

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“…the International Union for Pure and Applied Chemistry (IUPAC) classification. 11 They are very similar to each other at low and middle relative pressures, while their hysteresis loops are changed under different synthesis conditions. The existence of hysteresis loops indicates that the ACF/CA samples have mesopores.…”

Section: The Mechanical Properties Of Carbon Aerogelsmentioning

confidence: 72%

“…[7][8][9][10] J. Wang et al reported the study of carbon cloth-reinforced carbon aerogel films derived from resorcinol formaldehyde. 11 However, there are no literature reports to our knowledge related to the study of ACF/CA composites.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Activated Carbon Fibers/Carbon Aerogels Composites by Gelation and Supercritical Drying in Isopropanol

Zheng

Liu

et al. 2003

J. Mater. Res.

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Activated carbon fiber/carbon aerogel (ACF/CA) composites were fabricated by gelling a mixture of ACF and resorcinol and furfural, followed by supercritical drying of the mixture in isopropanol. The product then went through carbonization in a nitrogen atmosphere. The fabrication conditions, such as the mass content of R–F, the content of the ACF added, and the gelation temperature, were explored. The textures and pore structures of the ACF/CA composites thus obtained were characterized using transmission electron microscopy, scanning electron microscopy, and a surface area analyzer. The mechanical properties of the samples were assessed primarily through compressive tests. The experimental results indicated that the added ACF disperses uniformly in the resulting ACF/CA composites. The carbon matrix of the ACF/CA composites also consisted of interconnected carbon nanoparticles with sizes in the range of 20 to 30 nm. The ACFs can reinforce the related carbon aerogels when they originally have low mass density and are weak in mechanical strength. When large amounts of ACF were added to the composites, the micropore area and micropore volume of the composites increased, but their external surface area decreased. The mesopore volumes and the related diameters and mesopore size distributions of the ACF/CA composites were mainly affected by the mass density of the composites. The micropore sizes of all the composites were sharply concentrated at about 0.5 nm.

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“…10,11 There are always four typical stages during the preparation of carbon aerogels, including gelation and aging of the sol mixture, solvent exchange, drying of the wet gel, and carbonization of the dried gel. 12,13 Many reports have focused on the effects of each step on the green/nal microstructure and properties of the carbon aerogel. [14][15][16] Especially, it is found that drying process of the wet gel is one of the most important processes during the fabrication of carbon aerogels.…”

Section: Introductionmentioning

confidence: 99%

Step-freeze-drying method for carbon aerogels: a study of the effects on microstructure and mechanical property

et al. 2019

RSC Adv.

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Untitled

Cited by 37 publications

References 11 publications

Advances in Tailoring Resorcinol‐Formaldehyde Organic and Carbon Gels

Advances in Tailoring Resorcinol‐Formaldehyde Organic and Carbon Gels

Fabrication of Activated Carbon Fibers/Carbon Aerogels Composites by Gelation and Supercritical Drying in Isopropanol

Step-freeze-drying method for carbon aerogels: a study of the effects on microstructure and mechanical property

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