Effect of silica aerogel on thermal insulation and acoustic absorption of geopolymer foam composites: The role of aerogel particle size

Chen, Yuxuan; Klima, Kinga; Brouwers, Hjh Jos; Yu, Qingliang

doi:10.1016/j.compositesb.2022.110048

Cited by 87 publications

(19 citation statements)

References 56 publications

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“…Although there are no studies on the particle size of aerogels in textile fabrics, Chen et al conducted a study on geopolymer foam aerogel renders for buildings. Although the results indicated that the coefficient of thermal conductivity increased with increasing particle size of the aerogels, the authors noted that larger particle size could make the aerogel better function as a thermal insulator in the geopolymer foam renders [37].…”

Section: Thermal Conductivity and Thermal Resistance Resultsmentioning

confidence: 94%

Investigation of Thermal and Solar Properties of Aerogel Powder Coated Textiles

KÖKEN¹,

Kanık

2023

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Aerogels, the lowest-density solids in the world, have very effective thermal insulation properties with their extremely high surface area and porous structure. Recently, there has been an increasing interest in using aerogels in the textile industry, especially to obtain functional and technical textiles. In this study, thermal and solar properties of polyester fabrics coated at different concentrations (1 %, 2 %, and 4 %) of aerogels with different particle sizes (~ 8 µm, 0 – 80 µm, 0 – 0.5 mm) were investigated. It was observed that the aerogel particle size and concentration had a significant effect on the thermal and solar properties, and the lowest thermal conductivity coefficient and thermal resistance values (0.036 W/mK and 14.33 m2 K/W, respectively) appeared at the largest particle size and maximum concentration. In contrast, the solar reflectance values of the coated samples decrease up to 62 % with increasing aerogel particle size. In a conclusion, the coating method with aerogel powders could be applied to improve the thermal insulation and solar protection properties of mainly curtains, tents, tarpaulins, and sportswear fabrics.

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Section: Thermal Conductivity and Thermal Resistance Resultsmentioning

confidence: 94%

Investigation of Thermal and Solar Properties of Aerogel Powder Coated Textiles

KÖKEN¹,

Kanık

2023

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“…The micrographs also show differences in the shape and connectivity of the pores in samples prepared with SDS compared with those produced with Hostapur OSB, the former samples exhibited round-shaped [ 25 ], but mostly closed pores, while in the latter, irregular and open pores were observed. Small and closed pores may contribute to thermal insulation [ 44 ], while open pores will benefit wastewater treatment applications [ 35 ]. The rheology and setting time of the mixture can influence stabilizing of the pores.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Nature and Concentration of the Surfactant on the Properties of Red Mud/Metakaolin Porous Geopolymers Foamed with Aluminium

Bilici

Carvalheiras²,

Labrincha³

et al. 2022

Materials

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The chemical foaming technique is possibly the most common method of producing porous geopolymers. Despite this, to date, the role of the content and type of surfactant on the pore size distribution of porous geopolymers is not fully perceived, as constant surfactant dosages are usually employed. In addition, the comparison of literature studies is challenging since a distinct mixture of designs is employed. This investigation intends to provide additional insights on the topic, focusing on synthesizing red mud/metakaolin geopolymer foams and envisioning their use in thermal insulating applications. Various mixtures were prepared using three commercially available surfactants, namely Hostapur OSB, sodium dodecyl sulfate (SDS), and Triton X114. The content of the surfactant (0.025, 0.05, and 0.075 wt.%) and the amount of the foaming agent (aluminum powder, Al; 0.05, 0.075, and 0.10 wt.%) was modified, keeping the binder composition constant and the physical properties of the produced geopolymers were characterized. Results show that the combination between sodium dodecyl sulfate (0.025 wt.%) and aluminum (0.10 wt.%) leads to the strongest reduction in the foam density, the lowest value here reported being −400 kg/m3. On the other hand, samples produced with Hostapur OSB have much higher open porosity (up to 47.7%) and water absorption (up to 80.4%) values, showing that this surfactant leads to a pore network with higher connectivity. In addition, the microstructure of the foams, particularly pore morphology (size and shape) and connectivity between the produced pores are highly dependent on the type of surfactant, sodium dodecyl sulfate generating coarser pore size distribution with round, but mostly closed pores, while a narrower pore size distribution coupled with smaller size pores is seen with the Hostapur. These results suggest the feasibility of tuning the foams’ properties (porosity and mechanical performance) according to the application by the proper combination of the type of surfactant and their concentration, enabling their use as thermal and acoustic insulators or as filters/membranes in wastewater treatment systems.

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“…The C4 grass Miscanthus x giganteus, commonly known as elephant grass, is increasingly used in geopolymer production [ 33 , 34 , 35 ]. The 12-foot-tall plant has suitable thermal insulation properties.…”

Section: Gwp Of Materials Used For the Production Of Geopolymer-based...mentioning

confidence: 99%

Minimizing the Global Warming Potential with Geopolymer-Based Insulation Material with Miscanthus Fiber

Witzleben¹

2022

Polymers

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Approximately 45% of global greenhouse gas emissions are caused by the construction and use of buildings. Thermal insulation of buildings in the current context of climate change is a well-known strategy to improve the energy efficiency of buildings. The development of renewable insulation material can overcome the drawbacks of widely used insulation systems based on polystyrene or mineral wool. This study analyzes the sustainability and thermal conductivity of new insulation materials made of Miscanthus x giganteus fibers, foaming agents, and alkali-activated fly ash binder. Life cycle assessments (LCA) are necessary to perform benchmarking of environmental impacts of new formulations of geopolymer-based insulation materials. The global warming potential (GWP) of the product is primarily determined by the main binder component sodium silicate. Sodium silicate’s CO2 emissions depend on local production, transportation, and energy consumption. The results, which have been published during recent years, vary in a wide range from 0.3 kg to 3.3 kg CO2-eq. kg−1. The overall GWP of the insulation system based on Miscanthus fibers, with properties according to current thermal insulation regulations, reaches up to 95% savings of CO2 emissions compared to conventional systems. Carbon neutrality can be achieved through formulations containing raw materials with carbon dioxide emissions and renewable materials with negative GWP, thus balancing CO2 emissions.

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Effect of silica aerogel on thermal insulation and acoustic absorption of geopolymer foam composites: The role of aerogel particle size

Cited by 87 publications

References 56 publications

Investigation of Thermal and Solar Properties of Aerogel Powder Coated Textiles

Investigation of Thermal and Solar Properties of Aerogel Powder Coated Textiles

Evaluation of the Nature and Concentration of the Surfactant on the Properties of Red Mud/Metakaolin Porous Geopolymers Foamed with Aluminium

Minimizing the Global Warming Potential with Geopolymer-Based Insulation Material with Miscanthus Fiber

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