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<p>Crack-free silica aerogel monoliths with the desired properties were successfully synthesized via a custom-built autoclave. The impact of the synthesis environment on the morphological, optical, and thermal properties of the synthesized monoliths was examined. The autoclave successfully produced an aerogel monolith with a surface area of up to 998.25&#xa0;g/m², a thermal conductivity of 0.0053 mW·m⁻¹ K<sup>− 1&#xa0;°C</sup>, and a density of 0.047&#xa0;g/cm³. The samples were examined through SEM and BET measurements. These investigations revealed that density, porosity, and optical permeability are significantly influenced by the initial pH and its impact on the final microscopic structure. The absence of a catalyst during the preparation of aerogels resulted in the production of dense, opaque monoliths with reduced porosity. The environment, with a pH of 8, significantly affected the characteristics and properties of the aerogel, The acidity of the reaction environment progressively influenced the final properties of the aerogel. It cannot be denied that this is essential to accomplish the required optical and nanoparticles.</p>

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Influence of the manufacturing environment on the production of crack-free silica aerogels at acidic, basic, and neutral pH, structural, morphological and optical properties of homogeneous by supercritical drying

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Ruaa A. Mohammed,
  • Israa F. AL-Sharuee,
  • Asmaa N. Ahmed,
  • Khalida A. Thejeel

摘要

Crack-free silica aerogel monoliths with the desired properties were successfully synthesized via a custom-built autoclave. The impact of the synthesis environment on the morphological, optical, and thermal properties of the synthesized monoliths was examined. The autoclave successfully produced an aerogel monolith with a surface area of up to 998.25 g/m², a thermal conductivity of 0.0053 mW·m⁻¹ K− 1 °C, and a density of 0.047 g/cm³. The samples were examined through SEM and BET measurements. These investigations revealed that density, porosity, and optical permeability are significantly influenced by the initial pH and its impact on the final microscopic structure. The absence of a catalyst during the preparation of aerogels resulted in the production of dense, opaque monoliths with reduced porosity. The environment, with a pH of 8, significantly affected the characteristics and properties of the aerogel, The acidity of the reaction environment progressively influenced the final properties of the aerogel. It cannot be denied that this is essential to accomplish the required optical and nanoparticles.