Nano Res. Electronic Supplementary Material Self-healing superhydrophobic polyvinylidene fluoride/ Fe 3 O 4 @polypyrrole fiber with core–sheath structures for superior microwave absorption Yunan Li 1 , Yong Zhao 1 , Xianyong Lu 1 ( ), Ying Zhu 1 ( ), and Lei Jiang 1,2 1 Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191,China 2 Laboratory of Bio-inspired Smart Interfacial Science, Technology Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China Supporting information to DOI 10.1007/s12274-016-1094-x TEM image of PVP-coated Fe 3 O 4 nanoparticles is shown in Fig. S1(a). It can be observed that magnetite nanoparticles exhibit spherical shape without obvious agglomeration. The histogram based on statistical results (Fig. S1(b)) shows that the average size of Fe 3 O 4 nanoparticles is 8.5 ± 1.5 nm. The XRD pattern (Fig. S1(c)) exhibits prominent peaks at 2θ = 30.1°, 35.5°, 43.1°, 53.6°, 57.1°, 62.7°, 71.2° and 74.3° corresponding to (220), (311), (400), (420), (511), (440), (620) and (533) reflections of the magnetite (JCPDS no. 19-0629), respectively. In Fig. S1(d), the broad band in the range of 3,700 to 3,000 cm –1 is attributed to O–H stretching vibration for polyol molecules absorbed to the nanoparticles surface [S1]. In addition, the sharp peak at about 578 cm –1 is ascribed to Fe–O stretching vibration of Fe 3 O 4 nanoparticles [S2]. The peaks at around 2,931–2,850, 1,460 and 1,072 cm –1 are due to C–H stretching vibration, C–H bending vibration and C–O stretching vibration, respectively [S2]. The characteristic peak at 1,664 cm –1 is assigned to C=O stretching vibration, suggesting that PVP was modified on the surface of Fe 3 O 4 nanoparticles via coordination interaction through its carbonyl group [S1]. According to the TG curve (Fig. S1(e)), the percentage of PVP modified on the surfaces of Fe 3 O 4 nanoparticles is 29.0 wt.%. Magnetization curve (Fig. S1(f)) of Fe 3 O 4 nanoparticles measured at room temperature shows that the as- prepared Fe 3 O 4 nanoparticles were superparamagnetic with saturation magnetization (M s ) of 56.5 emu/g. Fe 3 O 4 nanoparticles exhibit good colloidal stability in ethanol, even though the dispersion is exposed to an external magnetic field (inset in Fig. S1(f)). Address correspondence to Xianyong Lu, [email protected]; Ying Zhu, [email protected]
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Nano Res.
Electronic Supplementary Material
Self-healing superhydrophobic polyvinylidene fluoride/Fe3O4@polypyrrole fiber with core–sheath structures for superior microwave absorption
Yunan Li1, Yong Zhao1, Xianyong Lu1 (), Ying Zhu1 (), and Lei Jiang1,2
1 Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment,
Beihang University, Beijing 100191,China 2 Laboratory of Bio-inspired Smart Interfacial Science, Technology Institute of Physics and Chemistry, Chinese Academy of Science, Beijing
100190, China
Supporting information to DOI 10.1007/s12274-016-1094-x
TEM image of PVP-coated Fe3O4 nanoparticles is shown in Fig. S1(a). It can be observed that magnetite
nanoparticles exhibit spherical shape without obvious agglomeration. The histogram based on statistical results
(Fig. S1(b)) shows that the average size of Fe3O4 nanoparticles is 8.5 ± 1.5 nm. The XRD pattern (Fig. S1(c)) exhibits
prominent peaks at 2θ = 30.1°, 35.5°, 43.1°, 53.6°, 57.1°, 62.7°, 71.2° and 74.3° corresponding to (220), (311), (400),
(420), (511), (440), (620) and (533) reflections of the magnetite (JCPDS no. 19-0629), respectively. In Fig. S1(d),
the broad band in the range of 3,700 to 3,000 cm–1 is attributed to O–H stretching vibration for polyol molecules
absorbed to the nanoparticles surface [S1]. In addition, the sharp peak at about 578 cm–1 is ascribed to Fe–O
stretching vibration of Fe3O4 nanoparticles [S2]. The peaks at around 2,931–2,850, 1,460 and 1,072 cm–1 are due
to C–H stretching vibration, C–H bending vibration and C–O stretching vibration, respectively [S2]. The
characteristic peak at 1,664 cm–1 is assigned to C=O stretching vibration, suggesting that PVP was modified on
the surface of Fe3O4 nanoparticles via coordination interaction through its carbonyl group [S1]. According to
the TG curve (Fig. S1(e)), the percentage of PVP modified on the surfaces of Fe3O4 nanoparticles is 29.0 wt.%.
Magnetization curve (Fig. S1(f)) of Fe3O4 nanoparticles measured at room temperature shows that the as-
prepared Fe3O4 nanoparticles were superparamagnetic with saturation magnetization (Ms) of 56.5 emu/g. Fe3O4
nanoparticles exhibit good colloidal stability in ethanol, even though the dispersion is exposed to an external
Figure S1 (a) TEM image; (b) statistical histogram; (c) XRD pattern and (d) FT-IR spectrum; (e) TG curve; (f) magnetization curve of Fe3O4 nanoparticles (inset: digital photograph the ethanol dispersion of Fe3O4 nanoparticles in absence or presence of magnetic field).
Figure S2 Digital photographs of free-standing and flexible PVDF/[email protected] film.
It can be observed from Fig. S3 that more nanoparticles are formed on the surface of PVDF/[email protected] film
as the feeding of pyrrole monomers increases from 0.05 g to 0.10 g in chemical oxidative polymerization.
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