Design and manufacture of electromagnetic absorber composed of boric acid-incorporated wastepaper composites

Abstract

Overview

With significant advancements in technology, the use of electrical and electronic devices has escalated, increasing exposure to electromagnetic waves. This study focuses on the design of an electromagnetic absorber incorporating boric acid with varying percentages into wastepaper composites to mitigate these exposures.

Findings

• Three types of wastepaper: office paper, newsprint, and cardboard paper were used.
• Boric acid levels (5, 10, 20, 30 wt%) and their effects on absorption were compared against mineral additives Copper (Cu) and Aluminum (Al).
• Newsprint demonstrated superior absorption effectiveness, with up to 40 dB of absorption.
• Comparative effectiveness: Al, Cu, and boric acid boards achieved about 40 dB, 30 dB, and 20 dB, respectively.

Conclusion

The study indicates that the use of boric acid, either as a powder or as a surface layer, provides acceptable levels of electromagnetic absorption. This highlights potential biological effects of widespread electronic device usage on human health and the effectiveness of boric-acid-based absorbers.