Prospect of Thermal Insulation by Silica Aerogel: A Brief Review

Hasan, Mohammed Adnan; Sangashetty, Rashmi; Akinlabi, Esther T.; Patil, Saraswati B.; Sherikar, Baburao N.; Dey, Arjun

doi:10.1007/s40033-017-0136-1

Cited by 57 publications

(28 citation statements)

References 42 publications

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“…In addition to these materials, silica aerogels firstly synthesized by Kistler in 1931 have been used as additive materials in experimental studies for insulation purposes in concrete technology in recent years. Considering the thermal conductivity coefficients of other insulation materials are in the range of 0.018-0.048 W/mK, the silica aerogels have extremely superior thermal insulation ability for a solid material with very low thermal conductivity coefficients (0.0034-0.022 W/mK) [15][16][17]. e lightness and low-volume structure of the aerogels make silica aerogels attractive compared to all other fibrous and foam-based insulation materials besides their high durability properties [18].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Bostancı

Sola

2018

Advances in Civil Engineering

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Compressive strength, thermal conductivity coefficient, and porosimetric properties of alkali-activated slag (AAS) mortars containing silica aerogel were investigated experimentally in this study. For this purpose, slag mortar mixtures at 0.75% and 1.0% aerogel content ratios were prepared, and these mortar mixtures were activated with lithium carbonate (Li 2 CO 3 ) at 0.03% and 1.50% dosage rates. Mortar samples were exposed to curing process in water for 2, 7, and 28 days, and the samples, which completed the curing stage, were subjected to the compressive strength test. e porosimetry test and the thermal conductivity coefficient measurement were carried out following the compressive strength test on 28-day samples. e varying aerogel content rate in the mixtures and the effects of the dosage of Li 2 CO 3 on the gel, capillary, and macropore distributions, and the effect of changing porosimetric properties on compressive strength and thermal conductivity coefficient were analyzed in detail. Experimental studies have shown that AAS mortars including an optimum 0.75% aerogel content rate and 0.03% Li 2 CO 3 activation provided a compressive strength of 34.1 MPa and a thermal conductivity coefficient of 1.32 W/mK. Aerogel addition provides a partial compressive strength increase at 7-and 28-day samples while it also causes maximum strength loss of 5.0% at 2-day samples.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Bostancı

Sola

2018

Advances in Civil Engineering

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“…Moreover, these new aerogels show strong application prospects in the fields of thermal insulation, sound absorption, purification and separation, energy conversion, and biomedicine. [ 2, 3 ]…”

Section: Introductionmentioning

confidence: 99%

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

et al. 2021

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Aerogel is a nanoporous solid material with ultrahigh porosity, ultralow density, and thermal conductivity, which is considered to be one of the most promising high‐performance insulation materials today. However, traditional pure inorganic aerogels (i.e., silica aerogel) exhibit inherent structural brittleness, making their processing and handling difficult, and their manufacturing costs are relatively high, which limits their large‐scale practical use. The recently developed aerogel based on polymer nanofibers has ultralow thermal conductivity and density, excellent elasticity, and designable multifunction. More importantly, one‐dimensional polymer nanofibers are directly used as building blocks to construct the network of aerogels via a gelation‐free process. This greatly simplifies the aerogel preparation process, thereby bringing opportunities for large‐scale aerogel applications. The aggregation of inorganic nanomaterials and polymer nanofibers is considered to be a very attractive strategy for obtaining highly flexible, easily available, and multifunctional composite aerogels. Therefore, this review summarizes the recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation. The main processing routes, porous microstructure, mechanical properties, and thermal properties and applications of these aerogels are highlighted. In addition, various future challenges faced by these aerogels in thermal insulation applications are discussed in this review.

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“…The application of efficient insulation materials is one of the most effective ways of energy conservation and environmental protection 1–3 . Aerogels are unique low density, three‐dimensional (3D) high porosity materials, which have wide utility including high quality insulators, refractory material, highly reactive catalyst carrier, and adsorption material 4–7 . The widespread use of classic inorganic aerogels represented by silica aerogel is limited due to the complicated preparation process and weak mechanical properties 8,9 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Aerogels are unique low density, three-dimensional (3D) high porosity materials, which have wide utility including high quality insulators, refractory material, highly reactive catalyst carrier, and adsorption material. [4][5][6][7] The widespread use of classic inorganic aerogels represented by silica aerogel is limited due to the complicated preparation process and weak mechanical properties. 8,9 Until now, the commercialization of silica aerogels has been restricted to granulate or aerogel blankets (currently, fibers reinforced composites).…”

Section: Introductionmentioning

confidence: 99%

Facile preparation for gelatin/hydroxyethyl cellulose‐SiO₂ composite aerogel with good mechanical strength, heat insulation, and water resistance

Peng

Zhu

Huang

et al. 2021

J of Applied Polymer Sci

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The advanced thermal insulation materials with low cost and high mechanical properties play an important role in transport packaging and thermal protection fields. An inorganic/organic composite aerogel was prepared through hydrogen bonds and chemical crosslinking among silica aerogel particles, gelatin (GA), and hydroxyethyl cellulose (HEC). The as‐prepared GA/HEC‐SiO2 composite aerogels were characterized by compression tests, scanning electron microscopy, Fourier transform infrared, thermogravimetric analyzer, and contact angle tests to investigate the chemical composition and physical structure. The GA/HEC‐SiO2 composite aerogels exhibited a strong mechanical strength (0.53–4.01 MPa), a high compression modulus (1.33–11.52 MPa), a lower volume density (0.035–0.081 g/cm3), thermal conductivity as low as 0.035 W/[m K]), a porosity of more than 93%, and hydrophobic angle as high as 150.01° after hydrophobic modification. These results indicate that biopolymer composite aerogels embedded with SiO2 aerogel particles display a bright future in thermal insulation.

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Prospect of Thermal Insulation by Silica Aerogel: A Brief Review

Cited by 57 publications

References 42 publications

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

Facile preparation for gelatin/hydroxyethyl cellulose‐SiO₂ composite aerogel with good mechanical strength, heat insulation, and water resistance

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Prospect of Thermal Insulation by Silica Aerogel: A Brief Review

Cited by 57 publications

References 42 publications

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Mechanical Properties and Thermal Conductivity of Aerogel-Incorporated Alkali-Activated Slag Mortars

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

Facile preparation for gelatin/hydroxyethyl cellulose‐SiO2 composite aerogel with good mechanical strength, heat insulation, and water resistance

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Product

Resources

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Facile preparation for gelatin/hydroxyethyl cellulose‐SiO₂ composite aerogel with good mechanical strength, heat insulation, and water resistance