Ultra-fast heat dissipating aerogels derived from polyaniline anchored cellulose nanofibers as sustainable microwave absorbers

Abstract

Electromagnetic (EM) pollution is ubiquitous and has soared to a great extent in the past few decades. The use of plant sourced cellulose nanofibers to fabricate sustainable and high performance electromagnetic shielding materials is foreseen as a green solution by the electronics industry to address this unseen pollutant. In this view, we report a facile and environmentally benign strategy to synthesize ultra-light and highly conductive aerogels derived from cellulose nanofibers (CNF) decorated with polyaniline (PANI) via a simple in-situ polymerization and subsequent freeze drying process devoid of any volatile organic solvents. The obtained conductive aerogels exhibited density as low as 0.01925 g/cc with a maximum EMI shielding value −32 dB in X band region. These porous shields demonstrated strong microwave absorption behavior (95 %) with minimal reflection (5 %) coupled with high specific EMI SE value ∼1667 dB.cm 3 . g −1 which make these aerogels a potential candidate for use in telecommunication, military and defense applications.

Analysis and availability of lignocellulosic wastes: Assessments for Indonesia and Peru

“…The characteristics of biocomposite materials must go in line with the intended applications. Some advanced applications, such as electrochemical devices (Subramanian et al., 2007), biomedical (Jacob et al., 2018), or water treatment (Gopakumar et al., 2017; Pai et al., 2020) would generally demand nanoscale tailoring of the biocomposite properties. However, for other applications, such as food packaging, storage, and rigid materials, overall thermomechanical stability and low hydrophilicity deem sufficient (P. Balakrishnan et al., 2017).…”

Flexible papers derived from polypyrrole deposited cellulose nanofibers for enhanced electromagnetic interference shielding in gigahertz frequencies

“…For any EMI shielding material for practical device applications, a minimum EMI SE value of −20 dB is considered suitable for the smooth functioning of the electronic device 54,55 . However, there are only limited reports on PPy/CNF based nanopapers as efficient microwave absorbers.…”

“…For any EMI shielding material for practical device applications, a minimum EMI SE value of −20 dB is considered suitable for the smooth functioning of the electronic device. 54,55 However, there are only limited reports on PPy/CNF based nanopapers as efficient microwave absorbers. Recently, L. Tang et al (2015) fabricated flexible and highly conductive membranes via in situ polymerization of pyrrole monomer onto bacterial cellulose membranes.…”

Study of the effect of band gap and photoluminescence on biological properties of polyaniline/CdS QD nanocomposites based on natural polymer

“…In recent years, nano-conductive polymer composites due to their electronic, various morphology, optical and biocompatibility properties have been developed as promising candidates for bio-applications such as cytotoxicity [1][2][3][4][5][6][7][8][9][10] . Among conducting polymers, nano-structured polyanilines have attracted much attention due to a lot of advantages, availability, facile preparation, maneuverability of particle size and morphology, biocompatibility, high chemical stability and good electrical conductivity 3,6,[10][11][12][13][14][15][16][17][18][19][20][21] . However, practical use of polyaniline has been limited because of its low solubility, processability and weak mechanical properties.…”

“…Copolymerization of polyaniline with polysaccharides has been recognized as an effective strategy to eliminate these shortcomings and favorable physicochemical properties. In recent years, polyaniline/biopolymer composites have been investigated to produce eco-friendly and high performance materials with biological properties [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] . One of the operative biological properties of the conductive polymers is cytotoxicity which is depended on some physicochemical features such as shape, size, surface area, agglomeration state, surface charge, elemental composition and surface activity of the material 23,24 .…”