“…Moreover, while polymer/nanosheet composites have been vigorously studied [ 74 , 75 ], no combination between a synthetic gelator and an inorganic nanosheet has yet been reported for such a thixotropic gel except for our previous report on a LMWG/ inorganic nanosheet system. In relation to this study, facile preparation processes of magnetic composite polymer hydrogels composed of iron oxide particles and poly(vinyl alcohol) have been reported in the literature [ 76 – 78 ]. Scheme 1.…”
A composite gel composed of a water-soluble aromatic polyamide hydrogelator and the nanosheet Laponite®, a synthetic layered silicate, was produced and found to exhibit thixotropic behaviour. Whereas the composite gel contains the gelator at the same concentration as the molecular gel made by the gelator only, the composite gel becomes a softer thixotropic gel compared to the molecular gel made by the gelator only. The reason for this could be that bundles of polymer gelator may be loosened and the density of the polymer network increased in the presence of Laponite.
“…Moreover, while polymer/nanosheet composites have been vigorously studied [ 74 , 75 ], no combination between a synthetic gelator and an inorganic nanosheet has yet been reported for such a thixotropic gel except for our previous report on a LMWG/ inorganic nanosheet system. In relation to this study, facile preparation processes of magnetic composite polymer hydrogels composed of iron oxide particles and poly(vinyl alcohol) have been reported in the literature [ 76 – 78 ]. Scheme 1.…”
A composite gel composed of a water-soluble aromatic polyamide hydrogelator and the nanosheet Laponite®, a synthetic layered silicate, was produced and found to exhibit thixotropic behaviour. Whereas the composite gel contains the gelator at the same concentration as the molecular gel made by the gelator only, the composite gel becomes a softer thixotropic gel compared to the molecular gel made by the gelator only. The reason for this could be that bundles of polymer gelator may be loosened and the density of the polymer network increased in the presence of Laponite.
“…The result is quite similar to that in Ding's literature . It can be concluded that the surface centered cubic magnetic Fe 3 O 4 particles were successfully fabricated and the XRD patterns don't show any other peaks, which illustrated the samples have a high purity and great degree of crystallinity . In addition, the prominent peaks in XRD patterns of the pure Fe 3 O 4 NPs are poignant and high.…”
Section: Resultsmentioning
confidence: 89%
“…[45] It can be concluded that the surface centered cubic magnetic Fe 3 O 4 particles were successfully fabricated and the XRD patterns don't show any other peaks, which illustrated the samples have a high purity and great degree of crystallinity. [46] In addition, the prominent peaks in XRD patterns of the pure Fe 3 O 4 NPs are poignant and high. However, when it comes to the XRD patterns of Fe 3 O 4 @NVP-DVB NPs (Figure 3b, c), the corresponding peaks turn to plain and lower compared with peaks of Figure 3a.…”
Section: Resultsmentioning
confidence: 99%
“…Whether the self-healing efficiency, healing condition or the tensile strength of our synthesized self-healing polymers, we all have competitiveness compared with the former reports. [46,53] Moreover, the self-healing of the sample was fast and with the healing time increasing, the healing time appeared a tendency of increase and the contribution to the healing of the rise in healing time is high and obvious before 60 minutes, when it comes to 60 minutes and longer, the healing time has a little effect on the H σ on the magnetic self-healing polymers sample. This finding can be accounted for the increase of the formation of hydrogen bonds between polymers in the magnetic self-healing polymers sample with increasing healing time and the formation nearly reached at a limitation when the healing time was longer than 120 minutes.…”
Doped functional polymers, such as magnetic self‐healing polymers based on magnetic inorganic nanoparticles, have raised great attention and been applied in many fields recently due to their superior properties. However, the deficiency of interface compatibility between the inorganic nanoparticles and organic polymers, and the sedimentation and non‐uniform dispersion of the inorganic nanoparticles led to difficulties in the fabrication and development of doped functional polymer materials. In this work, we took magnetic doped self‐healing polymers as an example and proposed an accessible method to solve the problem. We prepared organic‐polymer‐coated Fe3O4 nanoparticles with high interface compatibility and then applied them to successfully synthesize magnetic self‐healing polymers. The average size of the resulting coated Fe3O4 nanoparticles was 8.82±1.09 nm, the practical saturation magnetization of the nanoparticles and the magnetic self‐healing polymers was 83.35, 24.29 emu/g, respectively. In addition, the self‐healing efficiency of the magnetic self‐healing polymers could reach 74.3% when healing for 1 hour and 78.4% when adding a magnetic field compared with 75.8% for the pure self‐healing polymers and 34.5% of magnetic polymers based on pure Fe3O4 nanoparticles. This work may offer a reference in fabricating doped functional polymers based on inorganic nanoparticles with high interface compatibility.
In this study, a novel amidoxime‐based magnetic adsorbent (AO‐PAN‐g‐Chitosan/Fe3O4) was prepared by grafting acrylonitrile onto the surface of chitosan (CS) and magnetic Fe3O4 composite, followed by amidoximation. The magnetic adsorbents were characterized by infrared spectroscopy (FT‐IR) and X‐ray diffraction (XRD). The adsorption properties of the magnetic adsorbents for heavy metal ions in aqueous solutions were investigated under different conditions, including pH, contact time, and initial concentration of heavy metal ions. Under optimum conditions, the maximum Cu(II) and Ni(II) ion adsorption efficiencies were determined to be 38.39 mg/g and 32.68 mg/g by AO‐PAN‐g‐Chitosan/Fe3O4, respectively. Significantly, the Fe3O4/AO‐PAN‐g‐CS can be reproduced in a simple way and reused after five adsorption‐desorption cycles without any significant loss in the adsorption capacity.
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