Synergistic Effect of Mill Scale and MoS₂ in Geopolymer Composites for EMI Shielding Application
Jan 1, 2022·
,·
0 min read
Sharma, R.
Stephen Timothy Gordon II
et al.
Abstract
This study reports the development of a synergistic composition of geopolymer for EMI shielding building material using micron-sized molybdenum disulfide (MoS2) as an electrically conductive filler and Mill scale as a magnetic filler. The use of Mill scale allows reutilization of industry waste and provides a saturation magnetization of 22 emu/g. The filler content was varied up to 50 wt% and geopolymer composites were tested for EMI shielding effectiveness as per ASTM-D4395, electrical conductivity, and saturation magnetization. Simultaneous use of both fillers helps achieving a synergistic effect and yielding an EMI shielding effectiveness of 65 dB over 24 dB and 20 dB best obtained with only Mill scale and MoS2, respectively. To evaluate the functionality of these geopolymer composites as building materials, composites were evaluated as per ASTM-C109 and were found to qualify the prescribed standards for compressive strength. The results show the feasibility of achieving practically relevant EMI shielding geopolymer building materials.
Type
Publication
Journal of Materials Science: Materials in Electronics, 33
Status
Peer-reviewed
Authors
Ph.D. Engineer & Instructor of Record — Materials, Electrical & Civil Engineering
Stephen Timothy Gordon II is a Ph.D. engineer with interdisciplinary expertise across
electrical engineering, materials science, and civil engineering. His research develops
rapid electrical (ohmic) curing and additive manufacturing of fly-ash-based geopolymers,
and the electrical, dielectric, and inductive characterization of sustainable construction
materials. He has taught undergraduate engineering as Instructor of Record across seven
terms (300+ students) and is author or co-author of ten scholarly works — first author on two.