Carbon Nanomaterials in Silica Aerogel Matrices

Hamilton, Christopher E.; Chavez, Manuel E.; Duque, Juan G.; Gupta, Gautam; Doorn, Stephen K.; Dattelbaum, Andrew M.; Obrey, Kimberly A

doi:10.1557/proc-1258-r05-11

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…17,[27][28][29][30][31][32] Despite the hundreds of articles related to silica-CNT hybrid composites present in the literature, such as glasses, and xerogels, 19,30 or aerogel-like criogels and ambigels, 29,33 just a handful of recent papers focused on aerogels, strictly speaking (obtained by supercritical drying), can be found. [34][35][36][37] The aim of this work is to introduce a synthesis procedure to easily obtain monolithic homogeneous silica hybrid aerogels that host functional CNT which may remain available for different applications. In addition, this work deeply researches the structural and mechanical properties of the obtained composites as a function of the CNT content.…”

Section: Introductionmentioning

confidence: 99%

Reinforced silica-carbon nanotube monolithic aerogels synthesised by rapid controlled gelation

Piñero

Mesa

Santos

et al. 2018

J Sol-Gel Sci Technol

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Manuscript Click here to download Manuscript AeroSic-Paper_JSST_30.docx Click here to view linked References HIGHLIGHTS • Homogeneous SiO2-carbon nanotube monolithic aerogels were obtained by rapid controlled gelation • The carbon nanotubes were homogeneously dispersed in the highly porous silica matrix • The hybrid aerogels kept outstanding structural features and densities below 80 mg/cm in all cases • The Si-O-C covalent bonding between carbon nanotubes and silica matrix was prompted by FTIR • The carbon nanotubes turned the aerogels into 100% stiffer and 60% more deformable materials ABSTRACT This work introduces a new synthesis procedure for obtaining homogeneous silica hybrid aerogels with carbon nanotube contents up to 2.50 wt.%. The inclusion of nanotubes in the highly porous silica matrix was performed by a two-step sol-gel process, resulting in samples with densities below 80 mg/cm 3. The structural analyses (N2 physisorption and SEM) revealed the hierarchical structure of the porous matrix formed by nanoparticles arranged in clusters of 100 nm and 300 nm in size, specific surface areas around 600 m 2 /g and porous volumes above 4.0 cm 3 /g. In addition, a relevant increase on the mechanical performance was found, and an increment of 50% for the compressive strength and 90% for the maximum deformation were measured by uniaxial compression. This reinforcement was possible thanks to the outstanding dispersion of the CNT within the silica matrix and the formation of Si-O-C bridges between nanotubes and silica matrix, as suggested by FTIR. Therefore, the original synthesis procedure introduced in this work allows the fabrication of highly porous hybrid materials loaded with carbon nanotubes homogeneously distributed in the space, which remain available for a variety of technological applications.

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Section: Introductionmentioning

confidence: 99%

Reinforced silica-carbon nanotube monolithic aerogels synthesised by rapid controlled gelation

Piñero

Mesa

Santos

et al. 2018

J Sol-Gel Sci Technol

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“…Sedova et al [2] reported their investigation of the effects of tungsten disulfide nanotubes on the mechanical properties of silica aerogel. Several studies [3,4] described improvements of the mechanical properties of silica aerogels caused by addition of CNTs. In a study by Huang et al [5], excellent adsorption capacities for various oils of a composite multiwall CNT–silica aerogel were shown.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Silica and Alginate Hybrid Aerogel Particles with Embedded Carbon Nanotubes (CNTs) for Selective Sorption

2018

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The manuscript describes methods for producing hybrid silica microparticles and hybrid alginate beads with carbon nanotube (CNT) contents up to 4.5 and 30 wt.%, respectively. Silica hybrid aerogel microparticles with embedded nanotubes were obtained using a two-stage sol–gel method with a gelling process in an oil-emulsion. Alginate hybrid aerogels with embedded nanotubes were obtained using cross-linking reactions. The following methods were used to measure the structural characteristics of obtained materials: nitrogen adsorption porosimetry, scanning electron microscopy (SEM), and others. It is shown that specific surface area and pore volume increase with the increase of CNT content in silica aerogel microparticles. Obtained aerogels were tested as adsorbents for argon–oxygen separation. The alginate hybrid aerogel with 30 wt.% CNT content has the best argon adsorption selectivity.

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“…One method includes dispersing fillers such as fibers in the silica matrix. Several studies reported the improved mechanical behavior of aerogels filled with different kinds of fibers [5][6][7]. The properties of the composite aerogel depend on those of the filler and on the interaction between the filler and the matrix.…”

Section: Introductionmentioning

confidence: 99%