Polymeric composites have attracted interest from researchers due to their physical properties that can be modified by adding different kinds of filler. Among the different types of composite materials, the magnetic polymeric composite nanofibers have shown interesting properties attributable to their size and morphology where the magneto-optical and magnetostrictive effects can be exploited to design sensors and actuators. This article focuses on the fabrication and characterization of two kinds of magnetic electrospun membranes and their application as light modulators by the effect of the magnetic field. The first membrane is based on the polylactic acid (PLA) mixed with cobalt ferrite (CoFe2O4), and the second membrane is based on the PLA with magnetite particles (PLA-Fe3O4) and polyvinylidene fluoride (PVDF); in this membrane, the PVDF was added to improve the brittleness of PLA. The morphological analysis of the PLA/CoFe2O4 and PLA-Fe3O4/PVDF samples was performed by scanning electron microscopy (SEM). The light modulation effect of the magnetic membranes was tested by applying a variable magnetic field and measuring the radiant flux (irradiance) of a laser light through the membrane. In addition, PLA/CoFe2O4 and PLA-Fe3O4/PVDF films were fabricated and tested to understand the mechanisms involved in the light modulation of the proposed membranes. The results indicate that the applied magnetic field changed the optical properties and the porous structure of the membranes, resulting in the change in the transmission of the light through the membranes.

中文翻译：

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通过应用可变磁场在磁性聚合物复合纳米纤维膜中进行光调制

聚合物复合材料由于其物理性质可以通过添加不同种类的填料来改变，因此引起了研究人员的兴趣。在不同类型的复合材料中，磁性聚合物复合纳米纤维显示出有趣的特性，这归因于它们的尺寸和形态，其中磁光和磁致伸缩效应可用于设计传感器和执行器。本文重点介绍两种磁性电纺膜的制备和表征，以及它们在磁场作用下作为光调制器的应用。第一个膜基于聚乳酸 (PLA) 与铁氧体钴 (CoFe2O4) 混合，第二个膜基于 PLA 与磁铁矿颗粒 (PLA-Fe3O4) 和聚偏二氟乙烯 (PVDF)；在这层膜中，添加 PVDF 是为了改善 PLA 的脆性。通过扫描电子显微镜 (SEM) 对 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 样品进行形态分析。通过施加可变磁场并测量穿过膜的激光的辐射通量（辐照度）来测试磁性膜的光调制效果。此外，制备并测试了 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 薄膜，以了解所提出的膜的光调制所涉及的机制。结果表明，外加磁场改变了膜的光学特性和多孔结构，导致光通过膜的传输发生变化。通过扫描电子显微镜 (SEM) 对 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 样品进行形态分析。通过施加可变磁场并测量穿过膜的激光的辐射通量（辐照度）来测试磁性膜的光调制效果。此外，制备并测试了 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 薄膜，以了解所提出的膜的光调制所涉及的机制。结果表明，外加磁场改变了膜的光学特性和多孔结构，导致光通过膜的传输发生变化。通过扫描电子显微镜 (SEM) 对 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 样品进行形态分析。通过施加可变磁场并测量穿过膜的激光的辐射通量（辐照度）来测试磁性膜的光调制效果。此外，制备并测试了 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 薄膜，以了解所提出的膜的光调制所涉及的机制。结果表明，外加磁场改变了膜的光学特性和多孔结构，导致光通过膜的传输发生变化。通过施加可变磁场并测量穿过膜的激光的辐射通量（辐照度）来测试磁性膜的光调制效果。此外，制备并测试了 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 薄膜，以了解所提出的膜的光调制所涉及的机制。结果表明，外加磁场改变了膜的光学特性和多孔结构，导致光通过膜的传输发生变化。通过施加可变磁场并测量穿过膜的激光的辐射通量（辐照度）来测试磁性膜的光调制效果。此外，制备并测试了 PLA/CoFe2O4 和 PLA-Fe3O4/PVDF 薄膜，以了解所提出的膜的光调制所涉及的机制。结果表明，外加磁场改变了膜的光学特性和多孔结构，导致光通过膜的传输发生变化。