Thermal properties of methyltrimethoxysilane aerogel thin films

Acquaroli, Leandro N.; Newby, Pascal; Santato, Clara; Peter, Yves-Alain

doi:10.1063/1.4965921

Cited by 12 publications

(4 citation statements)

References 40 publications

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“…However, this achievement in thermal conductivity is significant considering the TA/ATP/CNF aerogel’s notably low density of 6.13 mg·cm –3 . These values are significantly lower than those of previously reported CNF-based aerogels − and inorganic aerogels based on graphene nanosheets, SiO 2 nanofiber, graphene–carbon nanotube, and polybenzoxazine (Figure c). − This suggests that the TA/ATP/CNF aerogel is of great importance for applications requiring a high thermal insulation performance and low weight.…”

Section: Resultsmentioning

confidence: 69%

Ultralight, Hydrophobic, Fire-Resistant, and Highly Thermally Insulating Aerogel by Cross-Linking Cellulose Nanofiber with Tannin and Adenosine Triphosphate

Yoon,

Song,

Jeong

et al. 2023

ACS Appl. Polym. Mater.

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Although cellulose nanofiber (CNF) aerogels have promising applications in fields such as thermal insulation, adsorption, and separation, their use has been restricted because of their limited mechanical stability and flammability. To overcome these limitations, this study utilizes the unique properties of tannic acid (TA) and adenosine triphosphate (ATP) biomolecules to fabricate a synergistic TA/ATP/CNF aerogel with exceptional features such as ultralightness, hydrophobicity, lipophilicity, fire resistance, and high thermal insulation. With a low density of 6.13 mg•cm −3 , thermal conductivity of 0.12 W•m −1 •K −1 , and high limiting oxygen index of 30.5%, the TA/ATP/CNF aerogel outperforms other state-of-the-art aerogels, including CNF-based aerogels. The study also presents a computational algorithm using Python 3.6 to analyze the aerogel's highly porous structure. Owing to its lipophilic properties, the TA/ATP/CNF aerogel is a promising porous adsorbent capable of rapidly adsorbing oil/organic solvents while exhibiting excellent flame retardancy, even when saturated with oil. This study highlights the potential of using natural biomolecules to improve the properties of CNF aerogels, making them suitable for various applications such as thermal insulation, adsorption, and separation.

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Section: Resultsmentioning

confidence: 69%

Ultralight, Hydrophobic, Fire-Resistant, and Highly Thermally Insulating Aerogel by Cross-Linking Cellulose Nanofiber with Tannin and Adenosine Triphosphate

Yoon,

Song,

Jeong

et al. 2023

ACS Appl. Polym. Mater.

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“…The S3 had a thermal conductivity of 45.9 W m −1 K −1 , which is 7% lower than that of the pristine NCC due to the polysiloxane structure on the surface of the S3. On the other hand, the thermal conductivity of MTMS aerogel thin film is 19 W m −1 K −1 [11]. The MTMS aerogel can reduce the thermal conductivity of the silylated NCC.…”

Section: Flame Retardancy Of Silylated Nccmentioning

confidence: 99%

“…Cellulose is one of the most promising, attractive biopolymers in the world due to its lightweight [10], low thermal conductivity [11], eco-friendly feature [12], low cost [13], good biocompatibility [14], and easy chemical treatment [15,16]. Nanocrystalline cellulose (NCC) is prepared by chemically or physically treating microcrystalline cellulose (MCC) obtained from various woods [17,18].…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly flame retardant nanocrystalline cellulose prepared via silylation

2018

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Employing proper flame retardant materials is one of the most important fire safety guidelines when constructing buildings. Most flame retardants, however, contain halogen atoms that might become harmful gases to human body during combustion. We designed and fabricated an environmentally friendly flame retardant material with a superior performance for thermal insulation. Nanocrystalline cellulose (NCC) was prepared using acid hydrolysis method, and its surface was chemically modified through silylation treatment. Various characteristics of the flame retardant material, such as morphology, chemical structure, thermal stability, and thermal conductivity were investigated. When a mass ratio of NCC to methyltrimethoxysilane was 1:5, the limiting oxygen index of the silylated NCC increased to 34% and a char yield of 80% was obtained. The silylation led to enhancement in the thermal stability of NCC and generation of the char residue. Chemical structure of the residual materials after combustion was investigated by using Fourier transform infrared spectroscopy and x-ray differential photo spectroscopy.

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“…Cellulose is one of the most promising and attractive biopolymer, 20 due to its low thermal conductivity, 26 lightweight, 27 eco‐friendly feature, 28 good biocompatibility, 29 low cost, 30 and easy chemical modification, and treatment 31,32 . However, flammability is an ingrained characteristic of cellulose, that burn almost without formation of residual char.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of dialdehyde cellulose/amino‐functionalizedMCM‐41 core‐shellmicrospheres as a new eco‐friendly flame‐retardant nanocomposite

Abboud

Bondock

El‐Zahhar

et al. 2020

J of Applied Polymer Sci

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Using proper flame‐retardant materials when constructing buildings or fabricating devices is the most important fire safety guidelines. The halogen and phosphorus‐based compounds are among the most effective flame retardants. However, most of these compounds are recognized to have a harmful effect on human body and the environment during combustion. In this context, we designed and synthesized a new eco‐friendly flame‐retardant nanocomposite by combining dialdehyde cellulose (DAC) and amino‐functionalized mesoporous silica MCM‐41 (N‐M41). Spherical N‐M41 nanoparticles have been successfully prepared in one‐pot reaction using tetraethyl orthosilicate and (3‐aminopropyl)triethoxysilane (APTES), and then coated with different amounts of DAC through Schiff base reaction between the carbonyl group of DAC and NH2 of APTES. The resulted DAC@N‐M41 nanocomposite was characterized by XRD, Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, differential thermal analysis (DTA) and thermogravimetry analysis (TGA). TEM micrographs revealed that this nanocomposite was made up of core‐shell nanospheres structure with narrow size distribution (ca. 140 nm). DTA and TGA analysis revelated that the presence of silica within the nanocomposite can effectively increase the char yield, decrease the heat release, and improve the fire performance of the prepared nanocomposite. A mechanism of the reduction in flammability of this nanocomposite has been proposed.

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Thermal properties of methyltrimethoxysilane aerogel thin films

Cited by 12 publications

References 40 publications

Ultralight, Hydrophobic, Fire-Resistant, and Highly Thermally Insulating Aerogel by Cross-Linking Cellulose Nanofiber with Tannin and Adenosine Triphosphate

Ultralight, Hydrophobic, Fire-Resistant, and Highly Thermally Insulating Aerogel by Cross-Linking Cellulose Nanofiber with Tannin and Adenosine Triphosphate

Eco-friendly flame retardant nanocrystalline cellulose prepared via silylation

Synthesis and characterization of dialdehyde cellulose/amino‐functionalizedMCM‐41 core‐shellmicrospheres as a new eco‐friendly flame‐retardant nanocomposite

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