Scholarlink

<p>We examine the reduction of silver nanoparticle (AgNP) size under an external magnetic field within a classical nucleation theory framework combined with a sphere-packing description of atomic assembly. The model incorporates magnetic free-energy contributions arising from the coupling between the applied field and the magnetic susceptibility of the nucleating material, yielding a closed-form relation between nanoparticle radius and field strength. Our approach reproduces the experimentally observed decrease in the most-probable particle radius from approximately <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(170\text { nm}\)</EquationSource> </InlineEquation> at <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\mathcal {B}=49.27\text { mT}\)</EquationSource> </InlineEquation> when the magnetic field is oriented parallel to the stirring plane, and to <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(155\text { nm}\)</EquationSource> </InlineEquation> at <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\mathcal {B}=180.78\text { mT}\)</EquationSource> </InlineEquation> in the perpendicular configuration. Across the investigated field range, the theoretical predictions remain consistent with experimental measurements obtained under continuous mechanical stirring, supporting the interpretation that the observed size reduction originates from a magnetic-field-induced modification of the nucleation free-energy landscape. Within the limits of classical capillarity and spherical demagnetization, the results provide a physically transparent and computationally efficient framework for understanding magnetic-field-controlled nanoparticle size selection.</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

Magnetic field controlled nucleation and size selection of silver nanoparticles

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月7日

查看全文
  • Yazeed Tawalbeh,
  • Mauro F. Pereira

摘要

We examine the reduction of silver nanoparticle (AgNP) size under an external magnetic field within a classical nucleation theory framework combined with a sphere-packing description of atomic assembly. The model incorporates magnetic free-energy contributions arising from the coupling between the applied field and the magnetic susceptibility of the nucleating material, yielding a closed-form relation between nanoparticle radius and field strength. Our approach reproduces the experimentally observed decrease in the most-probable particle radius from approximately \(170\text { nm}\) at \(\mathcal {B}=49.27\text { mT}\) when the magnetic field is oriented parallel to the stirring plane, and to \(155\text { nm}\) at \(\mathcal {B}=180.78\text { mT}\) in the perpendicular configuration. Across the investigated field range, the theoretical predictions remain consistent with experimental measurements obtained under continuous mechanical stirring, supporting the interpretation that the observed size reduction originates from a magnetic-field-induced modification of the nucleation free-energy landscape. Within the limits of classical capillarity and spherical demagnetization, the results provide a physically transparent and computationally efficient framework for understanding magnetic-field-controlled nanoparticle size selection.