Abstract
We report the fabrication of imaging quality optical mirrors with smooth surfaces using carbon nanotubes (CNT) embedded in an epoxy matrix. CNT/epoxy is a multifunctional composite material that has sensing capabilities and can be made to incorporate self-actuation. Moreover, as the precursor is a low density liquid, large and lightweight mirrors can be fabricated by processes such as replication, spincasting, and three-dimensional printing. Therefore, the technology holds promise for the development of a new generation of lightweight, compact “smart” telescope mirrors with figure sensing and active or adaptive figure control. We report on measurements made of optical and mechanical characteristics, active optics experiments, and numerical modeling. We discuss possible paths for future development.
Highlights
IntroductionCarbon nanotube epoxy (CNT/E) is a member of a new class of multifunctional or “smart” materials
Carbon nanotube epoxy (CNT/E) is a member of a new class of multifunctional or “smart” materials. It is a combination of epoxy, a thermoset polymer that features low density and high-dimensional stability, and carbon nanotubes (CNT), which possess high modulus, high electrical conductivity, high thermal conductivity, large ratio of surface area to mass, piezoresistivity, and an ability to actuate due to electrochemical charge injection and expansion in length of the C─C bond.[1]
Multiwall CNTs mixed with diglycidyl ether of bisphenol-A (DEGBA) and a solvent are subjected to high shear mixing and ultrasonication to de-agglomerate the CNT bundles and form a uniform dispersion
Summary
Carbon nanotube epoxy (CNT/E) is a member of a new class of multifunctional or “smart” materials. If CNT/E can be used in place of traditional glass or metal or ceramics, the result would be smart mirrors that have the built-in ability to sense and actuate without the need for external components. This development could lead to substantial reductions in system mass, complexity, power, and cost, as well as increased compactness and reliability
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