Recent advances on lightweight aerogel as a porous receiver layer for solar thermal technology application

Yashim, Marshahida Mat; Sainorudin, Muhammad Hanif; Mohammad, Masita; Fudholi, Ahmad; Razali, Halim; Sopian, Kamaruzzaman

doi:10.1016/j.solmat.2021.111131

Cited by 27 publications

(8 citation statements)

References 174 publications

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“…They also have a thermal conductivity coefficient below 0.02 W/(m∙K), a low dielectric constant of 1.1, speed of sound of 100 m/s and refractive index within the range 1.00–1.08 [ 19 , 20 , 21 ]. The exceptional properties of silica aerogels allow for their use in numerous industries; they can be employed as thermal and acoustic insulators [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ], catalytic converters, carriers of active substances [ 19 , 29 , 30 ], absorbents of gases, liquids or energy and sensors [ 31 , 32 , 33 , 34 , 35 ].…”

Section: Silica Aerogel—synthesis and Propertiesmentioning

confidence: 99%

Research Development in Silica Aerogel Incorporated Cementitious Composites—A Review

2022

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This paper presents an analysis of research results for silica aerogel cement composites over the past twenty years. Recently, two trends in the development of these composites have been noted, towards structural applications and towards ultralight composites for coatings and renders. Ongoing research shows that important aspects of cementitious composites with good mechanical performance are the proper selection of aggregates and improved adhesion at the silica aerogel–cement binder interface, which will guarantee high compressive strength with the lowest possible thermal conductivity. The best physicomechanical performance of aerogel cement composites with low thermal conductivity below 0.03 W/(m·K) was obtained when cenospheres and aerogel were used in a weight percentage of 5%. In turn, the prerequisites for using aerogel cement composites as coatings for energy-efficient building façades are the use of large amounts of silica aerogel as a substitute for lightweight aggregates or the selection of an optimal composition of lightweight aggregates and aerogel, ensuring the lowest possible thermal conductivity coefficient. Other important standpoints are water transport and moisture protection of the silica aerogel-based coatings. Therefore, in recent years, more and more elements of the hygrothermal performance, porosity and durability of silica aerogel cement composites have been developed. The article also points out the weaknesses of the application of silica aerogel in the cement matrix, the most important of which are the lack of adhesion at the boundary of the aerogel–cement binder, the increased porosity of the composite, the high water absorption capacity and the significant decrease in compressive strength with large volumes of silica aerogel. Solving these issues will certainly contribute to the wider applicability of these materials in the construction industry.

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Section: Silica Aerogel—synthesis and Propertiesmentioning

confidence: 99%

Research Development in Silica Aerogel Incorporated Cementitious Composites—A Review

2022

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“…With their exceptional thermodynamic properties, high porosity, and mesoporous structure, PIAs serve as an exemplary thermal protective insulation material. 14–17…”

Section: Introductionmentioning

confidence: 99%

Polyimide aerogels with low thermal conductivity and high-temperature stable properties prepared by lyophilization for flexible thermal protection

Xu,

Zhang,

Liang

et al. 2023

High Performance Polymers

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Polyimide aerogel, presenting an outstanding new material for lightweight protective thermal insulation, has garnered significant attention in the aerospace field. Despite its potential, due to the high production cost of the supercritical drying method used for its preparation, its widespread application is limited. In this research, a series of lightweight polyimide aerogels (F-PIAs, 3,3',4,4'-biphenyl tetracarboxylic dianhydride (s-BPDA) and 4,4'-diaminodiphenyl ether (ODA)) with excellent thermal protection properties were prepared by lyophilization. The findings indicated that F-PIAs (Freeze-dried polyimide aerogels) exhibited comparable physical characteristics to S-PIAs (Supercritical-dried polyimide aerogels), while their preparation cost was even more economical. F-PIAs exhibits excellent flexible and compression behavior (compression strength up to 1.16 MPa, modulus up to 12.8 MPa), which provide a great structural basis for the production of molded thermal insulation protective materials. The average pore diameter of F-PIAs is in the range of 7∼11 nm. The nanoporous structure leads to the gas within the pores of the aerogel producing the Knudsen effect, thereby significantly enhancing the thermal insulation performance of the aerogel. The thermal conductivity of F-PIA-4 (Freeze-dried polyimide aerogels with a solid content of 4%) at room temperature is as low as 0.023 W·m−1·K−1, which is superior to the PIAs (0.043 W·m−1·K−1) prepared by lyophilization in literature. Its thermal diffusion coefficient changes from 0.108 mm2·s−1 to 0.18 mm2·s−1 in the temperature range of 27°C to 200°C, demonstrating good thermal insulation performance at high temperatures. Meanwhile, after heating on a 150°C flat plate for 11 min and 41 s, the surface temperature of F-PIA-4 was only 36.2°C, further verifying its excellent thermal insulation performance. The results of the TGA experiment on F-PIA-4 demonstrated the high-temperature stability of aerogel (Td5% is higher than 523°C, Td10% is higher than 566°C). The exceptional properties of F-PIAs hold significant practical reference value in helping to reduce the manufacturing cost of high-performance aerogel thermal insulation materials, thereby enabling their widespread application in aerospace, military, and civil field.

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“…[ 1,12–17 ] In addition to shape stability and thermal conductivity, the concept of energy conversion associated with PCMs has gained significant popularity in recent years. [ 18–21 ] Consequently, a large number of high‐performance phase change composites with enhanced comprehensive properties have emerged, [ 2,5,22–33 ] presenting great application potential based on their unique features, namely, high energy storage capacity and nearly constant phase change temperature. [ 12,34–36 ] Common processing technologies of functional phase change composites include micro/nanoencapsulation, [ 37,38 ] physical blending, [ 30 ] and vacuum‐assisted impregnation.…”

Section: Introductionmentioning

confidence: 99%

Exploring Next‐Generation Functional Organic Phase Change Composites

Zhou

Yang

Feng

et al. 2022

Adv Funct Materials

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As one of the main forms and intermediate carriers of energy, it is impressive to expand the application scope of heat energy, thereby boosting innovations in heat harvesting, conversion, storage, regulation, and utilization associated with the relevant techniques. Phase change materials (PCMs), as a state-of-the-art latent heat storage technique, have garnered increasing interest in heat-related applications over the past decades, and abundant high-performance PCMs with excellent shape stability and salient thermal conductivity have been developed. This review focuses on the issues concerning organic PCMs from the perspectives of flexible, multifunctional, and smart phase change composites, along with emerging applications and processing technologies, which are expected to offer possible guidance for the exploration of next-generation advanced functional phase change composites.

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Recent advances on lightweight aerogel as a porous receiver layer for solar thermal technology application

Cited by 27 publications

References 174 publications

Research Development in Silica Aerogel Incorporated Cementitious Composites—A Review

Research Development in Silica Aerogel Incorporated Cementitious Composites—A Review

Polyimide aerogels with low thermal conductivity and high-temperature stable properties prepared by lyophilization for flexible thermal protection

Exploring Next‐Generation Functional Organic Phase Change Composites

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