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Abstract <p>This study presents a systematically optimized synthesis route for submicron Ca(OH)<sub>2</sub> particles (SM-Ca(OH)<sub>2</sub>) particles, designed to address particle coarsening issues in traditional hydrothermal/precipitation methods by regulating grain growth kinetics. Polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) were used as dispersant and stabilizer, respectively. The effects of PEG dosage, SDS dosage, PEG molecular weight, NaOH addition rate, stirring time, and speed on the purity and yield of SM-Ca(OH)<sub>2</sub> particles were systematically investigated. High-purity SM-Ca(OH)<sub>2</sub> with an average particle size of approximately 434.46 nm was successfully synthesized by optimizing the preparation parameters, including a PEG molecular weight of 200, SDS dosage of 4.62&#xa0;mmol&#xa0;L<sup>−1</sup>, PEG concentration of 301&#xa0;mmol&#xa0;L<sup>−1</sup>, dropwise NaOH addition (0.6&#xa0;mol, 10&#xa0;mol/L), and stirring at 100 rpm for 30&#xa0;min. XRD confirmed the crystalline phase of SM-Ca(OH)<sub>2</sub>, showing slight crystallinity reduction due to PEG and SDS interference. FTIR revealed enhanced surface OH<sup>−</sup> groups, improving dispersibility. SEM showed a hexagonal plate-like morphology with minimal agglomeration, while EDS confirmed the presence of Ca and O, indicating high purity. UV–Vis indicated a narrow band gap, suggesting uniform dispersion, while DLS confirmed a narrow size distribution with an average diameter of 434.46 nm. This study establishes a system for the preparation of high-quality SM-Ca(OH)<sub>2</sub>, deepens the understanding of the synthesis mechanism through systematic theoretical support and development in the fields of environmental remediation and modification of building materials.</p> Graphical Abstract <p></p>

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Preparation and dispersion stability of SM-Ca(OH)2 regulated by PEG-SDS composite template

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Lei Liu,
  • Binkai Zhao,
  • Xing Zhang,
  • Xiaoyu Song,
  • Qingyu Zhang,
  • Tingting Zhang,
  • Shuaiqi Zhang,
  • Juncai Xu,
  • Qingwei Li,
  • Zihao Ding,
  • Yalin Li

摘要

Abstract

This study presents a systematically optimized synthesis route for submicron Ca(OH)2 particles (SM-Ca(OH)2) particles, designed to address particle coarsening issues in traditional hydrothermal/precipitation methods by regulating grain growth kinetics. Polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) were used as dispersant and stabilizer, respectively. The effects of PEG dosage, SDS dosage, PEG molecular weight, NaOH addition rate, stirring time, and speed on the purity and yield of SM-Ca(OH)2 particles were systematically investigated. High-purity SM-Ca(OH)2 with an average particle size of approximately 434.46 nm was successfully synthesized by optimizing the preparation parameters, including a PEG molecular weight of 200, SDS dosage of 4.62 mmol L−1, PEG concentration of 301 mmol L−1, dropwise NaOH addition (0.6 mol, 10 mol/L), and stirring at 100 rpm for 30 min. XRD confirmed the crystalline phase of SM-Ca(OH)2, showing slight crystallinity reduction due to PEG and SDS interference. FTIR revealed enhanced surface OH− groups, improving dispersibility. SEM showed a hexagonal plate-like morphology with minimal agglomeration, while EDS confirmed the presence of Ca and O, indicating high purity. UV–Vis indicated a narrow band gap, suggesting uniform dispersion, while DLS confirmed a narrow size distribution with an average diameter of 434.46 nm. This study establishes a system for the preparation of high-quality SM-Ca(OH)2, deepens the understanding of the synthesis mechanism through systematic theoretical support and development in the fields of environmental remediation and modification of building materials.

Graphical Abstract