Scholarlink

<p>This study investigates the thermophysical and optical properties of core–shell nanoparticles composed of SiO<sub>2</sub>-coated TiO<sub>2</sub>, Fe<sub>3</sub>O<sub>4</sub>, and ZnO, along with their water-based nanofluids at a 2&#xa0;% mass concentration. The nanoparticles were synthesized, characterized, and analyzed using various techniques. The results indicate total mass losses of 11.0&#xa0;%, 9.5&#xa0;%, and 26.5&#xa0;% for TiO<sub>2</sub>@SiO<sub>2</sub>, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>, and ZnO@SiO<sub>2</sub>, respectively. Among these, the nanofluid containing ZnO@SiO<sub>2</sub> nanoparticles displayed superior stability and demonstrated the most significant increase in thermal conductivity at 2.51&#xa0;%. Furthermore, it was observed that all nanofluids exhibited lower specific heat capacity compared to the base fluid. Notably, the TiO<sub>2</sub>@SiO<sub>2</sub>-based nanofluid experienced the most substantial decrease at 3.5&#xa0;%. Additionally, the viscosity values of the nanofluids exceeded those of the nanofluids with single particles. The core–shell nanoparticles exhibited extensive light absorption across a broad spectrum, with calculated optical band gap energies of 2.88&#xa0;eV, 3.65&#xa0;eV, and 3.25&#xa0;eV for Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>, TiO<sub>2</sub>@SiO<sub>2</sub>, and ZnO@SiO<sub>2</sub>, respectively. These findings highlight the effectiveness of utilizing nanofluids containing core–shell-structured nanoparticles for efficient heat transfer.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermal and Optical Characteristics of TiO2@SiO2, Fe3O4@SiO2, and ZnO@SiO2 Core–Shell Nanoparticles and Their Water-Based Nanofluids

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月24日

查看全文
  • Sezgi Koçak Soylu,
  • Osman Samet Özdemir,
  • Meltem Asiltürk,
  • İbrahim Atmaca

摘要

This study investigates the thermophysical and optical properties of core–shell nanoparticles composed of SiO2-coated TiO2, Fe3O4, and ZnO, along with their water-based nanofluids at a 2 % mass concentration. The nanoparticles were synthesized, characterized, and analyzed using various techniques. The results indicate total mass losses of 11.0 %, 9.5 %, and 26.5 % for TiO2@SiO2, Fe3O4@SiO2, and ZnO@SiO2, respectively. Among these, the nanofluid containing ZnO@SiO2 nanoparticles displayed superior stability and demonstrated the most significant increase in thermal conductivity at 2.51 %. Furthermore, it was observed that all nanofluids exhibited lower specific heat capacity compared to the base fluid. Notably, the TiO2@SiO2-based nanofluid experienced the most substantial decrease at 3.5 %. Additionally, the viscosity values of the nanofluids exceeded those of the nanofluids with single particles. The core–shell nanoparticles exhibited extensive light absorption across a broad spectrum, with calculated optical band gap energies of 2.88 eV, 3.65 eV, and 3.25 eV for Fe3O4@SiO2, TiO2@SiO2, and ZnO@SiO2, respectively. These findings highlight the effectiveness of utilizing nanofluids containing core–shell-structured nanoparticles for efficient heat transfer.