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| Super-absorbent polymers have been extensively studied and widely applied in various fields, such as hygienic products [13],drug delivery system [14,15], and agriculture [16] as well as waste-water treatment [17,18]. Generally, super-absorbents are moderately crosslinked hydrophilic polymer networks which can absorb large quantities of water or other aqueous fluids [19]. Some nanofillers have been introduced into the polymer matrix. Baoetal. [20] and Wang and Wang [21] have successfully synthesizedclay-based super-absorbent hydrogels to improve the swelling capacities as well as to reduce the production cost. However, low swelling properties in saline solutions still limit their applications.Carbon nanotubes [22] as new nanomaterials are also dispersed into the polymer networks to reinforce the hydrogels. Unfortunately,there are also some defects, such as high production cost and complex synthesis process. |
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