Journal
CARBOHYDRATE POLYMERS
Volume 255, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117333
Keywords
Pickering emulsion; Cellulose nanofibrils; Magnetic foam; Microwave absorption; Photo-thermal conversion; Multifunction
Categories
Funding
- National Natural Science Foundation of China [21664006, 21604025]
- Natural Science Foundation of Guangxi Province [2016GXNSFAA380004, 2015GXNSFAAI39256]
- Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20KF-l, 20AA-12]
- Bagui Scholar Program of Guangxi Province
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The study developed foam-based microwave absorbers with excellent photo-thermal conversion and thermal insulation properties using the oil-in-water Pickering emulsion gelation approach combined with freeze-drying. The hybrid foam consisted of cellulose nanofibrils and polylactic acid as three-dimensional skeleton, with carbon nanotubes and Fe3O4 nanoparticles homogeneously incorporated to form a conductive network with hetero-interfaces. The foam exhibited an optimal reflection loss value of -65.14 dB and high photo-thermal conversion performance, with superior thermal insulation compared to commercial foams. This research may provide a promising approach for developing ultralight and high-performance microwave absorbers with multifunctional applications.
The development of multifunctional microwave absorbers that worked in complex environments remains challenging. In this study, oil-in-water Pickering emulsion gelation approach was combined with freeze-drying to prepare foam-based microwave absorbers along with appealing photo-thermal conversion and thermal insulation. In hybrid foam, cellulose nanofibrils (CNP) and polylactic acid (PLA) serve as three-dimensional skeleton, where carbon nanotubes (CNT) and Fe3O4 nanoparticles are homogeneously incorporated, which forms a conductive network with hetero-interfaces. The optimal reflection loss value of the foam reaches -65.14 dB with a thickness of 3.0 mm. The foam also demonstrate high photo-thermal conversion performance with its surface temperature up to 97 degrees C after irradiation under 1 Sun for 5 min. Additionally, the foam shows superior thermal insulation comparing with the commercial polyvinyl alcohol and polyurethane foams. This study may offer a promising approach to develop ultralight and high-performance microwave absorber with great potential for multifunctional applications.
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