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Abstract

For the first time, an environmentally friendly and effective procedure to produce high-value engineering aerogels from fly ash (FA) has been developed by dispersing FA particles into a mixture of biodegradable polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC), followed by freezedrying. The effect of FA content on the physical properties, morphology, mechanical strength, and thermal conductivity of FA aerogels is also studied comprehensively. The lightweight FA aerogels show a low density of 0.072 – 0.093 g/cm3 with high porosity of 94.94 – 95.78%. The morphology of aerogels shows the uniform distribution of FA particles in PVA-CMC matrixes that creates a porous structure with a pore size of 2-5 mm. Therefore, the FA aerogels exhibit good heat insulation with extremely low thermal conductivity of 0.040 – 0.047 W/m.K at ambient temperature and pressure that is comparable to some commercial insulation materials such as mineral wool, fiberglass, expanded polystyrene, and other silica-based aerogels from waste. Moreover, the compressive modulus of FA aerogels is about 67.73 – 254.75 kPa indicating their excellent mechanical properties under 1 kN vertical compression. The experimental results indicate the significant better durability of FA aerogels than that of previous aerogels from other wastes such as sugarcane bagasse (88 kPa), pineapple leaf fibers (1.64 – 5.34 kPa), recycled polyethylene terephthalate (1.16 – 2.87 kPa), spent coffee grounds (5.41 – 15.62 kPa), and silica – cellulose (86 – 169 kPa). It is concluded that FA aerogels are a promising candidate as a lightweight thermal insulating material.



Author's Affiliation
  • Nga Hoang Nguyen Do

    Google Scholar Pubmed https://orcid.org/0000-0002-1606-4522

  • Huy Gia Tran

    Email I'd for correspondance:

     

     

    Google Scholar Pubmed

  • Huong Ly Xuan Doan

    Google Scholar Pubmed

  • Nghiep Quoc Pham

    Google Scholar Pubmed

  • Kien Anh Le

    Google Scholar Pubmed

  • Phung Kim Le

    Email I'd for correspondance: phungle@hcmut.edu.vn
    Google Scholar Pubmed

Article Details

Issue: Vol 4 No 1 (2021): Issue 1 Vol 4: Under Publishing
Page No.: 637-644
Published: Feb 13, 2021
Section: Research article
DOI: https://doi.org/10.32508/stdjet.v3i4.786

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Creative Commons License

Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 How to Cite
Do, N., Tran, H., Doan, H., Pham, N., Le, K., & Le, P. (2021). Advanced fabrication of lightweight aerogels from fly ash for thermal insulation. Science & Technology Development Journal - Engineering and Technology, 4(1), 637-644. https://doi.org/https://doi.org/10.32508/stdjet.v3i4.786

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