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 \({\mathrm{g}}^{-1}\). 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.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available due to competing financial interests but are available from the corresponding author upon reasonable request.
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Acknowledgements
Availability of funds from NSF under Cooperative Agreement Number OIA1541079 (CFDA #47.083) through the Louisiana Experimental Program to Stimulate Competitive Research (EPSCoR) helped to conduct SEM analysis at the Institute for Micromanufacturing (IfM), one of the Core User Facilities (CUF) under the Charter of the Louisiana State-Wide Consortium for Innovation in Materials Manufacturing (CIMM).
Funding
This work was supported by NSF under co-operative agreement number OIA1541079 (CFDA #47.083) through the Louisiana Experimental program to stimulate competitive research (EPSCoR).
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RS, SA, and AR contributed to the study conception and design, material preparation, data collection, and analysis. WC aided in XRD and SEM studies. SA and JM contributed to mechanical testing. SG contributed to electrical conductivity testing. NS contributed to study of magnetic properties. The first draft of the manuscript was written by RS and authors commented on the previous versions of the manuscript. All authors read and approved the final manuscript.
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Sharma, R., Seetala, N., Clower, W. et al. Synergistic effect of Mill scale and MoS2 in geopolymer composites for EMI shielding application. J Mater Sci: Mater Electron 33, 20056–20067 (2022). https://doi.org/10.1007/s10854-022-08823-4
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DOI: https://doi.org/10.1007/s10854-022-08823-4