Reinforcing silica aerogels with tungsten disulfide nanotubes

Sedova, Anastasiya; Bar, Galit; Goldbart, Ohad; Ron, Racheli; Achrai, Ben; Kaplan‐Ashiri, Ifat; Brumfeld, Vlad; Zak, Alla; Gvishi, Raz; Wagner, H. Daniel; Tenne, Reshef

doi:10.1016/j.supflu.2015.07.018

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…INT-WS 2 can be readily dispersed in organic solvents, polymers, epoxy resins, etc. Incorporating the nanotubes (0.1-2 wt %) into different polymers and inorganic phases, was shown to improve the mechanical and thermal behavior of different nanocomposites [30,31].…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

et al. 2019

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Composites of poly(l-lactic acid) (PLLA) reinforced by adding inorganic nanotubes of tungsten disulfide (INT–WS2) were prepared by solvent casting. In addition to the pristine nanotubes, PLLA nanocomposites containing surface modified nanotubes were studied as well. Several surface-active agents, including polyethylene imine (PEI), were studied in this context. In addition, other biocompatible polymers, like poly d,l-lactic acid (PDLLA) and others were considered in combination with the INT–WS2. The nanotubes were added to the polymer in different proportions up to 3 wt %. The dispersion of the nanotubes in the nanocomposites were analyzed by several techniques, including X-ray tomography microscopy (Micro-XCT). Moreover, high-temperature rheological measurements of the molten polymer were conducted. In contrast to other nanoparticles, which lead to a considerable increase of the viscosity of the molten polymer, the WS2 nanotubes did not affect the viscosity significantly. They did not affect the complex viscosity of the molten PLLA phase, either. The mechanical and tribological properties of the nanocomposites were found to improve considerably by adding the nanotubes. A direct correlation was observed between the dispersion of the nanotubes in the polymer matrix and its mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

et al. 2019

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“…The specific structure leads to very weak intermolecular forces between WS 2 nanotubes and enables their good dispersion in organic matrices, from which the most often tested were polymers. Due to their very interesting properties, the authors of study [ 67 ] decided to use WS 2 nanotubes in the silica aerogel matrix. WS 2 nanotubes were introduced to the catalyst solution, sonicated, and then the TEOS in ethanol solution was added.…”

Section: Fiber-based Silica Aerogel Nanocompositesmentioning

confidence: 99%

Recent Advances in Research on the Synthetic Fiber Based Silica Aerogel Nanocomposites

Ślosarczyk

2017

Nanomaterials

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The presented paper contains a brief review on the synthesis and characterization of silica aerogels and its nanocomposites with nanofibers and fibers based on a literature study over the past twenty years and my own research. Particular attention is focused on carbon fiber-based silica aerogel nanocomposites. Silica aerogel is brittle in nature, therefore, it is necessary to improve this drawback, e.g., by polymer modification or fiber additives. Nevertheless, there are very few articles in the literature devoted to the synthesis of silica aerogel/fiber nanocomposites, especially those focusing on carbon fibers and nanofibers. Carbon fibers are very interesting materials, namely due to their special properties: high conductivity, high mechanical properties in relation to very low bulk densities, high thermal stability, and chemical resistance in the silica aerogel matrix, which can help enhance silica aerogel applications in the future.

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“…The use of various raw materials allows the unique properties of aerogels to be maintained, such as: low density, high porosity, and specific surface area; and at the same time gives the material new functional properties, such as: strength, electrical conductivity, hydrophobicity, sorption, and selectivity. 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.…”

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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Reinforcing silica aerogels with tungsten disulfide nanotubes

Cited by 13 publications

References 27 publications

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

Nanocomposite of Poly(l-Lactic Acid) with Inorganic Nanotubes of WS2

Recent Advances in Research on the Synthetic Fiber Based Silica Aerogel Nanocomposites

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

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