Hydrophobic silica composite aerogels using poly(methyl methacrylate) by rapid supercritical extraction process

Jung, Hae Noo Ree; Lee, Yoon Kwang; Cho, Hyung Hee; Mahadik, D. B.; Park, Hyung Ho

doi:10.1007/s10971-017-4438-4

Cited by 23 publications

(7 citation statements)

References 28 publications

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“…These results confirm that the addition of an organic polymer drastically increases the thermal conductivity of hybrid aerogels. Hence, the thermal conductivity values of the TGP_X aerogels in the present work from 22.4 to 30.6 mW/mK are comparable to those of these previously reported organic–inorganic hybrid aerogels [ 38 , 52 , 53 , 54 , 55 ], owing to the synergy among the thermally less conductive PACA polymer (60 mW/mK) [ 56 ] and the silica aerogel.…”

Section: Resultssupporting

confidence: 88%

“…Moreover, Merillas et al [ 53 ] analyzed that the synthesized polyurethane-reinforced silica composite aerogel exhibited enhanced thermal conductivity from 33.4 to 52.5 mW/mK. Similarly, Ilhan et al [ 54 ] and Hae-Noo-Ree Jung et al [ 55 ] reported improved thermal conductivity of hydrophobic silica aerogels to around 41 and 131 mW/mK with the addition of polystyrene and poly(methyl methacrylate), respectively. These results confirm that the addition of an organic polymer drastically increases the thermal conductivity of hybrid aerogels.…”

Section: Resultsmentioning

confidence: 99%

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One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties

Ransing

Dhavale

Bangi

et al. 2023

Gels

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Silica aerogels and their derivatives have outstanding thermal properties with exceptional values in the thermal insulation industry. However, their brittle nature restricts their large-scale commercialization. Thus, enhancing their mechanical strength without affecting their thermal insulating properties is essential. Therefore, for the first time, highly thermally stable poly(acrylamide-co-acrylic acid) partial sodium salt is used as a reinforcing polymer to synthesize hybrid P(AAm-CO-AAc)-silica aerogels via epoxy ring-opening polymerization in the present study. Functional groups in P(AAm-CO-AAc) partial sodium salts, such as CONH2 and COOH, acted as nucleophiles for the epoxy ring-opening reaction with (3-glycidyloxypropyl)trimethoxysilane, which resulted in a seven-fold enhancement in mechanical strength compared to that of pristine silica aerogel while maintaining thermal conductivity at less than 30.6 mW/mK and porosity of more than 93.68%. Moreover, the hybrid P(AAm-CO-AAc)-silica aerogel demonstrated improved thermal stability up to 343 °C, owing to the synergetic effect between the P(AAm-CO-AAc) and the silica aerogel, corresponding to the thermal stability and strong covalent bonding among them. These excellent results illustrate that this new synthetic approach for producing hybrid P(AAm-CO-AAc)-silica aerogels is useful for enhancing the mechanical strength of pristine silica aerogel without impairing its thermal insulating property and shows potential as an industrial heat insulation material.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties

Ransing

Dhavale

Bangi

et al. 2023

Gels

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“…TG profiles of all the samples (Fig. S3 ) showed sharp weight loss starting at 307 °C and continuing up to 464 °C, thus confirming the decomposition of the organic material 12 , 29 . The decomposition of organic materials from MTMS-based silica aerogels and polyHIPE porous networks is well known and confirms the thermal stability around 280 °C, as reported earlier 10 .…”

Section: Resultsmentioning

confidence: 64%

Superhydrophobic and Compressible Silica-polyHIPE Covalently Bonded Porous Networks via Emulsion Templating for Oil Spill Cleanup and Recovery

Mahadik

Lee

Ghorpade

et al. 2018

Sci Rep

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We synthesize porous polyHIPE networks with silanol functionalities in the polyHIPE backbone. These silanol functionalities are used for covalent bonding with silica aerogels embedded in the polyHIPE. Covalent bonding between silica and polyHIPE networks are confirmed using Fourier-transform infrared spectroscopy and scanning electron microscopy. Silica aerogels covalently bonded with polyHIPE network show macroporous and mesoporous morphologies and possess excellent properties like high bendability, high elasticity, superhydrophobicity (~160°), low density (~0.128 g/cm3), and low thermal conductivity (~0.045 W/m·K). Oil absorption from water/oil mixtures and recovery of the absorbed oil (by squeezing) from flexible silica-polyHIPE networks is studied. The silica-polyHIPE is shown to absorb crude oil ~16-times its own weight and can be reused multiple times after recovery. Hence, such materials are very important for oil spill cleanup applications from aqueous systems.

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“…A new rapid supercritical extraction process has been reported by Jung et al to produce hydrophobic and transparent aerogels suitable for window shielding [151]. The hydrophobic character was introduced by adding poly(methylmethacrylate) to a silica gel, resulting in the addition of –OCH 3 and –CH 3 free radicals onto the surface.…”

Section: Applicationsmentioning

confidence: 99%

Nanomaterials in Advanced, High-Performance Aerogel Composites: A Review

et al. 2019

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Aerogels are one of the most interesting materials of the 21st century owing to their high porosity, low density, and large available surface area. Historically, aerogels have been used for highly efficient insulation and niche applications, such as interstellar particle capture. Recently, aerogels have made their way into the composite universe. By coupling nanomaterial with a variety of matrix materials, lightweight, high-performance composite aerogels have been developed for applications ranging from lithium-ion batteries to tissue engineering materials. In this paper, the current status of aerogel composites based on nanomaterials is reviewed and their application in environmental remediation, energy storage, controlled drug delivery, tissue engineering, and biosensing are discussed.

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Hydrophobic silica composite aerogels using poly(methyl methacrylate) by rapid supercritical extraction process

Cited by 23 publications

References 28 publications

One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties

One-Pot Sol–Gel Synthesis of Highly Insulative Hybrid P(AAm-CO-AAc)-Silica Aerogels with Improved Mechanical and Thermal Properties

Superhydrophobic and Compressible Silica-polyHIPE Covalently Bonded Porous Networks via Emulsion Templating for Oil Spill Cleanup and Recovery

Nanomaterials in Advanced, High-Performance Aerogel Composites: A Review

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