Transparent thermal insulation silica aerogels

Wang, Jieyu; Petit, Donald; Ren, Shenqiang

doi:10.1039/d0na00655f

Cited by 66 publications

(32 citation statements)

References 99 publications

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“…TC, thermal conductivity; SA, silica aerogel F I G U R E 7 Different kinds of heat transfer of SA. [61] SA, silica aerogel the effect of SA on TC could be seen in other material systems. [46,47,65] As can be seen, a similar trend with the present study is observed in epoxy/SA system.…”

Section: Tc Measurementsmentioning

confidence: 89%

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

et al. 2021

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Using transparent thermal insulators, which are low heat conductors and good light transmitters, is a brilliant idea to preserve heat energy. In this regard, silica aerogels (SAs) have attracted immense attention these days because of their unique nanoporous networks, consisting of connective silica nanoparticles and high-volume nanopores. The present study investigates the influence of incorporating 3 and 5 phr SAs on the mechanical properties, thermal conductivity (TC), and optical characteristics of polycarbonate/poly(methyl methacrylate) (PC/PMMA) (75/25, 50/50, and 25/75 w/w) blends. The scanning electron microscopy studies indicated that the PC/PMMA/SA (25/75/3) composite has the best dispersion. The highest improvements in tensile strength and Young's modulus were observed for the PC/PMMA/SA (75/25/5) composite. In addition, incorporating the SA resulted in a reduction in the impact strength of all the blends. The lowest TC was observed for the PC/PMMA/SA (75/25/5) blend composite. The TC results were compared with the data predicted by the Agari, Russell, Maxwell-Eucken, and Bruggeman models. It was found that the Agari logarithmic model has the best agreement with the experimental data. Except for PC, PMMA, PC/PMMA (25/75), and PC/PMMA/SA (25/75/3), no other samples showed optical transmittance. On average, PC/PMMA/SA (25/75/3) had 13% more light absorption than PC/PMMA (25/75). K E Y W O R D S blend composite, optical transmittancy, poly(methyl methacrylate), polycarbonate, silica aerogel, thermal conductivity | INTRODUCTIONAs an important group of engineering materials, polymer blends can be used in an extensive range of applications by tuning their chemical and physical properties. Thus, a new material possessing desired properties and enhanced performance can be prepared using polymer blending techniques. It has been well proved that creating a new resin is much more expensive than preparing a new blend. [1][2][3][4][5][6][7][8] That is why polymer blends have been the topic of immense interest in recent years.Due to its sufficient stiffness, high impact strength, good dimensional stability, high temperature stability, and, most significantly, excellent transparency, polycarbonate (PC) is utilized for various applications. However, PC suffers from some disadvantages including poor

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Section: Tc Measurementsmentioning

confidence: 89%

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

et al. 2021

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“…A thick layer of insulation material means higher usage of material and space [ 7 , 8 , 9 , 10 ]. Silica aerogels are emerging insulation materials with a thermal conductivity of ~0.014 to 0.020 W/m·K [ 11 , 12 , 13 , 14 , 15 , 16 ]. Unfortunately, aerogels are expensive, fragile, and hard to handle and lack scalability, hindering their widespread use [ 11 , 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Silica aerogels are emerging insulation materials with a thermal conductivity of ~0.014 to 0.020 W/m·K [ 11 , 12 , 13 , 14 , 15 , 16 ]. Unfortunately, aerogels are expensive, fragile, and hard to handle and lack scalability, hindering their widespread use [ 11 , 12 , 13 , 14 , 15 , 16 ]. Since aerogels have very low thermal conductivity, a thin layer of aerogels can provide the same amount of insulation that is obtained from a very thick layer of conventional insulation materials.…”

Section: Introductionmentioning

confidence: 99%

“…Since aerogels have very low thermal conductivity, a thin layer of aerogels can provide the same amount of insulation that is obtained from a very thick layer of conventional insulation materials. Initially, pure silica aerogels were produced by using the sol-gel method [ 11 , 12 , 13 , 14 , 15 , 16 ]. Recently, several other types of aerogels, including carbon aerogels, graphene aerogels, carbon nanotube aerogels, and cellulose aerogels, have been produced [ 17 , 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Hollow Silica Particles: A Novel Strategy for Cost Reduction

et al. 2021

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Thermal insulation materials are highly sought after for applications such as building envelopes, refrigerators, cryogenic fuel storage chambers, and water supply piping. However, current insulation materials either do not provide sufficient insulation or are costly. A new class of insulation materials, hollow silica particles, has attracted tremendous attention due to its potential to provide a very high degree of thermal insulation. However, current synthesis strategies provide hollow silica particles at very low yields and at high cost, thus, making the particles unsuitable for real-world applications. In the present work, a synthesis process that produces hollow silica particles at very high yields and at a lower cost is presented. The effect of an infrared heat absorber, carbon black, on the thermal conductivity of hollow silica particles is also investigated and it is inferred that a carbon black–hollow silica particle mixture can be a better insulating material than hollow silica particles alone.

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“…Aerogels are unusual materials that combine macroscopic external and nanosized internal structures with high specific surface area, low density and high porosity. Aerogels are often used as advanced insulation materials, 1,2 or as innovative tools for the microencapsulation of additives and drugs in food and pharmaceuticals. [3][4][5][6] Precipitated or fumed silica aerogels, which are very hygroscopic, are also used as desiccants 7,8 or as insecticide against drywood termites or flour beetles.…”

Section: Introductionmentioning

confidence: 99%

Aerogels are not regulated as nanomaterials, but can be assessed by tiered testing and grouping strategies for nanomaterials

Keller

Wiemann²,

Gröters

et al. 2021

Nanoscale Adv.

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Transparent thermal insulation silica aerogels

Abstract: Silica aerogel gives rise to much attention due to its unique nanoporous network, which consists of nanoscale connective silica particles and high-volume nanoscale pores. This lightweight superinsulation solid material is...

Cited by 66 publications

References 99 publications

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

Hollow Silica Particles: A Novel Strategy for Cost Reduction

Aerogels are not regulated as nanomaterials, but can be assessed by tiered testing and grouping strategies for nanomaterials

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