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Three-dimensional printing is the most cost-effective way to create multi-component complex structure metamaterial absorbers, and the key is to obtain raw materials with good absorption characteristics that are suitable for 3D printing. The CB-CIP/PLA composite filament was produced as the matrix by a high-energy mixer and twin-screw extruder by combining the dielectric loss material carbon black and the magnetic loss material carbonyl iron powder with polylactic acid as the matrix in this paper. During this period, a vector network analyzer investigated the composite material's electromagnetic characteristics, mostly investigating the effect of the CB and CIP content and thickness on the composite material's microwave absorbent properties. The CB-CIP/PLA composite has excellent microwave absorption and broad bandwidth when the CB content is 20% and CIP content is 30%, as the CB content is 20% and CIP content is 30%.
Source link: https://doi.org/10.3390/ma15155455
Abstract Background Household air pollution from solid fuel use has been attributed to adverse birth outcomes, but evidence on exposure-response relationships is limited. During the Household Air Pollution Intervention Network trial, we investigated the relationships between HAP exposures and birthweight in rural Guatemala, India, Peru, and Rwanda. During pregnancy, women in the intervention arm were given a liquified petroleum gas stove and fire, while control arm women continued using biomass.
Source link: https://doi.org/10.1101/2022.08.06.22278373
To provide a roadmap for self-heating units including PTC-Effects, three types of CB with clearly defined specific surface area and polyamides with high and low crystallinity were selected. The incorporation of CB with a high specific surface area in a highly crystalline PA has significantly reduced specific resistances up to 3. 7 °C and average surface temperatures up to 147 °C, indicating a promising material performance as a heating device.
Source link: https://doi.org/10.3390/ma15155400
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