Silicon dioxide thermal metamaterial for realizing radiation refrigeration and application thereof

Abstract

The invention belongs to the technical field of thermal metamaterials and radiation refrigeration, and discloses a silicon dioxide thermal metamaterial for achieving radiation refrigeration and application thereof. The silicon dioxide thermal metamaterial is composed of a reflecting layer and an absorbing layer located on the reflecting layer, and the absorbing layer is composed of a substrate layer and a pattern layer; the reflecting layer is composed of titanium dioxide layers and magnesium fluoride layers which are alternately arranged from top to bottom; and the substrate layer is composed of a silicon dioxide layer, a silicon nitride layer and a titanium dioxide layer which are sequentially arranged from top to bottom, the pattern layer is composed of silicon dioxide structure units which are periodically arranged on the upper surface of the silicon dioxide layer, each silicon dioxide structure unit comprises two silicon dioxide isosceles right-angle triangular prisms with the same size, and the two silicon dioxide isosceles right-angle triangular prisms are symmetrical about the geometric center of each silicon dioxide structure unit. The thermal metamaterial is simple in structure and easy to manufacture, has nearly perfect absorption in an atmospheric window and has higher reflection in a sunlight wave band.

Description

technical field [0001] The invention belongs to the technical field of thermal metamaterials and radiation refrigeration, and in particular relates to a silicon dioxide thermal metamaterial for realizing radiation refrigeration and its application. Background technique [0002] With the increasing demand for energy consumption, the emission of greenhouse gases has become a threat to people's lives. In particular, the traditional cooling method needs to consume a large amount of electric energy and is accompanied by the generation of heat, which further aggravates the emission of carbon dioxide and leads to global warming. Therefore, it is urgent to find an effective cooling method to reduce the temperature of buildings, vehicles and clothes and reduce energy consumption. Radiative cooling is a technology that lowers temperatures by selective emission within the atmospheric window without consuming energy. As early as 1975, Catalanotti et al. proposed the concept of radiati...

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Problems solved by technology

In particular, the traditional cooling method consumes a large amount of electricity and is accompanied by the generation of heat, which further aggravates the emission of carbon dioxide and leads to global warming.

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