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<p>K<sub>2</sub>O·nSiO<sub>2</sub>-based laminated fire-resistant glass with inverted reversible thermochromic (IRTC) performance was prepared by in-situ reaction method using a high solid content (55 wt% ± 1 wt%) SiO<sub>2</sub> sol and introducing NH<sub>4</sub><sup>+</sup> by doping with NH<sub>4</sub>HCO<sub>3</sub>. The structure, morphology, thermochromic and optical performances of these materials were studied in detail and characterized. The microporous structure formed by the addition of NH<sub>4</sub>HCO<sub>3</sub> was clearly observed using scanning electron microscopy (SEM), This structure increased the number of micropores and enhanced thermal insulation by extending heat transfer pathways. By analyzing the differences in light transmission intensity (T), the thermochromic mechanism of the material was elucidated. The combination of Derivative thermogravimetry (DTG) and Raman spectroscopy revealed that the addition of NH<sub>4</sub>HCO<sub>3</sub> resulted in the difference of the distribution percentage of silica bridged oxygen atoms in the samples, indicating that the NH<sub>4</sub>HCO<sub>3</sub> was the key factor enabling the inverted reversible thermochromic (IRTC) performance of the K<sub>2</sub>O·nSiO<sub>2</sub>-based material. This work provides a novel strategy and preparation method for t for developing the thermochromic smart fire-resistant windows.</p> Graphical Abstract <p></p>

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Inverted reversible thermochromic and thermal insulation performances of K2O·nSiO2-based fire-resistant glass

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Leilei Xin,
  • Yuran Qiao,
  • Yuanchun Mu,
  • Tiantian Meng,
  • Zhiqi He,
  • Xiaoyu Li

摘要

K2O·nSiO2-based laminated fire-resistant glass with inverted reversible thermochromic (IRTC) performance was prepared by in-situ reaction method using a high solid content (55 wt% ± 1 wt%) SiO2 sol and introducing NH4+ by doping with NH4HCO3. The structure, morphology, thermochromic and optical performances of these materials were studied in detail and characterized. The microporous structure formed by the addition of NH4HCO3 was clearly observed using scanning electron microscopy (SEM), This structure increased the number of micropores and enhanced thermal insulation by extending heat transfer pathways. By analyzing the differences in light transmission intensity (T), the thermochromic mechanism of the material was elucidated. The combination of Derivative thermogravimetry (DTG) and Raman spectroscopy revealed that the addition of NH4HCO3 resulted in the difference of the distribution percentage of silica bridged oxygen atoms in the samples, indicating that the NH4HCO3 was the key factor enabling the inverted reversible thermochromic (IRTC) performance of the K2O·nSiO2-based material. This work provides a novel strategy and preparation method for t for developing the thermochromic smart fire-resistant windows.

Graphical Abstract