Preparation and Wave-absorbing Performance of PANI/Fe3O4/CB Hollow Structured Composites†

doi:10.7503/cjcu20150965

Abstract

Abstract:

Polyaniline(PANI)/Fe₃O₄/carbon black(CB) microspheres with hollow-structure were synthesized through the method of interfacial polymerization and Pickering emulsion polymerization. The morphology, electromagnetic properties, and microwave absorbing properties of these materials were characterized. The results showed that the average diameter of these microspheres was about 2.0 μm. The magnetic loss within 2—4 GHz and within 4—18 GHz of these materials were mainly attributed to natural resonance and exchange resonance and to eddy current loss, respectively. In the measurement frequency range of 2—18 GHz, the microspheres with hollow-structure’s minimum reflection loss(RL) shifted to low frequency with the increase of coating layer thickness. As the coating layer thickness increased to 5.0 mm, two peaks occurred, which respectively located in C band(4—8 GHz) and Ku band(12—18 GHz). It was believed that PANI/Fe₃O₄/CB could be a potential electromagnetic wave absorbing materialin C and Ku bands.

Key words: Magneticnanoparticle, Polyaniline, Carbonblack, Composite material, Wave-absorbing performance

CLC Number:

O633.5
TM25

TrendMD:

GUO Yajun, ZHANG Long, HOU Jieqiong, MA Yongbo, QIU Hu, ZHANG Wenjuan, DU Xueyan. Preparation and Wave-absorbing Performance of PANI/Fe₃O₄/CB Hollow Structured Composites^†[J]. Chem. J. Chinese Universities, 2016, 37(6): 1202.

Figures/Tables 8

Fig.1 TEM images of Fe3O4-CA(A), CB(B) and S1—S5(C—G)

Fig.2 XRD patterns of Fe3O4(a), CB(b) and S1—S5(c—g)

Fig.3 Hysteresis loops of S1—S5(a—e)Insets: (A) is the curve of between saturation magnetization and the additions of CB, and (B) is magnetic separation from aqueous solution containing these microspheres.

Table 1 Conductivities of samples S1—S5 with different CB additions

Sample	m(CB)/mg	Conductivity/(S·cm^-1)
S1	None	1.984×10^-3
S2	2.0	2.324×10^-3
S3	4.0	1.948×10^-2
S4	6.0	2.304×10^-2
S5	8.0	3.155×10^-2

Fig.4 Frequency dependence on real(A) and imaginary(B) parts of complex permittivity, as well as real(C) and imaginary(D) parts of complex permeability of S1—S5

Fig.5 c0- f curves of S1—S5

Fig.6 RL-f curves of S1—S5(A—E) and Ku band width values with various CB additions(F)

Table 2 RLmin values of S1—S5 with the thickness of 5.0 mm in C and Ku bands

Sample	RL_min/dB(C band)	RL_min/dB(Ku band)	Sample	RL_min/dB(C band)	RL_min/dB(Ku band)
S1	-13.48	-21.5	S4	-16.24	-18.55
S2	-13.78	-21.3	S5	-16.79	-16.39
S3	-15.88	-19.1

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Preparation and Wave-absorbing Performance of PANI/Fe₃O₄/CB Hollow Structured Composites^†

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