Tailoring the optical and UV reflectivity of CFRP-epoxy composites: Approaches and selected results

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2023-01-01 DOI:10.1515/secm-2022-0175

Lukas Haiden, A. Brunner, Amol V. Pansare, M. Feuchter, G. Pinter

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引用次数: 0

Abstract

Abstract Specific nano- and micro-scale morphologies of composites can affect the resulting optical and UV reflectivity of the materials. One example is “Vantablack®” made from aligned carbon nanotubes (CNTs) with 99.96% absorption. A similar material with CNTs grown on surface-activated aluminum (CNTs/sa-Al) even yielded 99.995% absorption, one order of magnitude higher than Vantablack®. On the other hand, fresh snow reflects 90% or more of the incident electromagnetic radiation with wavelengths between 400 and 1,000 nm. The reflectivity of snow originates from multiple scattering in the porous morphology made of snow grains. Taking these complex morphologies as inspiration, CFRP epoxy composites with different types, sizes, shapes, and amount of nanoparticles are prepared and compared regarding their optical and ultraviolet (UV) reflectivity. Increasing the reflectivity in the near and far UV may be beneficial for the durability of the epoxy composites, but selective higher or lower reflectivity in certain wavelength ranges may also yield tailored visual effects. Results from different processing approaches with selected nanoparticles are presented and discussed.

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裁剪cfrp -环氧复合材料的光学和紫外线反射率:方法和选择的结果

复合材料的特定纳米和微观形貌会影响材料的光学反射率和紫外反射率。其中一个例子是“Vantablack®”由排列的碳纳米管(CNTs)制成，吸收率为99.96%。在表面活化铝(CNTs/sa-Al)上生长的类似材料甚至获得了99.995%的吸收率，比Vantablack®高一个数量级。另一方面，新雪反射90%或更多波长在400至1,000 nm之间的入射电磁辐射。雪的反射率来源于雪粒多孔形态的多次散射。以这些复杂的形貌为灵感，制备了不同类型、尺寸、形状和纳米颗粒数量的CFRP环氧复合材料，并对其光学反射率和紫外线反射率进行了比较。提高近紫外和远紫外的反射率可能有利于环氧复合材料的耐久性，但在某些波长范围内选择性地提高或降低反射率也可能产生定制的视觉效果。介绍并讨论了不同的纳米颗粒加工方法的结果。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.