Fabrication, superhydrophobicity, and microwave absorbing properties of the magnetic γ-Fe2O3/bamboo composites
Graphical abstract
Introduction
With superior optical, electrical, magnetic, thermal, and mechanical performances, nanometer-size inorganic particles/organic composites have been attracted significant interests in recent years [1]. The nanometer-size particles of metal oxides, such as Fe2O3 [2], SiO2 [3], TiO2 [4], ZnO [5] and so forth, are very useful materials, because they possess distinct size-dependent physicochemical properties. Among these inorganic nanoparticles, γ-Fe2O3 has been paid much attention due to its outstanding non-toxicity, thermal and chemical stability, especially the superparamagnetic behavior [6], which is widely applied in the fields of environmental protection, biomedicine, microwave absorbance, targeted drug delivery, and magnetic resonance imaging [7], [8], [9], [10], [11]. γ-Fe2O3 nanoparticles have been successfully fabricated via a variety of techniques such as laser pyrolysis, co-precipitation, sol–gel, microemulsion, ball-milling, and sonochemistry [8], [12], [13].
Bamboo, one of the cellulose-based materials, has been focused in present years for its fast growth, short renovation, and high mechanical robustness [14]. However, bamboo is vulnerably attacked by fungi and termites on account of its inherent hygroscopicity. Therefore, it is easy to lose its dimensional stability [15]. In our previous researches, hybrid inorganic–organic thin coatings deposited on the cellulose-based materials like wood have demonstrated to lower the rate of moisture sorption and grant new properties like superhydrophobic, UV-resistant, fire-retardant or others [16], [17], [18].
Herein, a new concept of the magnetic/bamboo composites was proposed in the current paper. In this study, we describe and report a convenient approach for the decoration of bamboo with magnetic nanoparticles by employing a simple modified chemical co-precipitation process with Fe3 + and Fe2 + salts as precursors. At the same time, the morphology, chemical composition, crystallization structure, thermostability magnetization and microwave absorption properties of magnetic bamboo hybrid were investigated in detail. Then the surface should be subsequently modified with FAS-17 to obtain superhydrophobicity. What is more, durability tests had been performed.
Section snippets
Materials
The moso bamboo (Phyllostachys heterocycla), obtained from Zhejiang Province in China, was cut into bamboo with the sizes of 10 mm (length) × 10 mm (width) × 4 mm (height). All the words of “bamboo” in this manuscription are referred to the bamboo strips cut from moso bamboo (P. heterocycla, Zhejiang Province, China). The bamboo is defined by this reference [14]. FeCl3·6H2O, FeCl2·4H2O, FAS-17, ammonium solution (25%–28%), hydrochloric acid, sodium chloride and sodium hydroxide were supplied by
Results and discussion
The SEM images in Fig. 1 show the surface morphologies of PB and MBC. As shown in Fig. 1a, the microstructure of a longitudinal section of PB whose vascular bundles were embedded in the matrix of ground parenchyma [19], and the insets display the photographs of PB with its light-yellow color and a typical EDS spectrum of the chemical compositions for PB. Only C, Au, and O elements could be detected from the spectrum. The element of Au came from the coating layer used for SEM observation and C
Conclusions
In summary, we have demonstrated a feasible method of fabricating magnetic γ-Fe2O3/bamboo composites with superior thermal stability. With further modification by FAS-17, the superhydrophobic magnetic γ-Fe2O3/bamboo composites were also prepared and even under corrosive or harsh conditions, the composites still remained superhydrophobic and superparamagnetic. Due to the feasibility of the fabrication, thermal stability and the stability in harsh conditions, the as-prepared hybrids with some
Acknowledgments
This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant No. LZ15C160002, Scientific Research Foundation of Zhejiang A&F University (Grant No. 2014FR077), and the National Natural Science Foundation of China (31470586).
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