Anisotropic silver nanoparticles were assembled on cotton
fibers
to realize the coloration of cotton. The assembly of silver nanoparticles
on fibers was achieved by linking of poly(diallyldimethylammonium
chloride) (PDDA) at room temperature.
The silver nanoparticle treated cotton showed different colors because
of localized surface plasmon resonance (LSPR) property of silver nanoparticles.
The coloration was completed through electrostatic interaction between
the PDDA treated cotton surface and the anisotropic silver nanoparticles
in the reaction system. Scanning electron microscopy (SEM) characterization
demonstrated that the morphologies of silver nanoparticles remained
unchanged during the coloration process, so the treated cotton inherited
the LSPR optical features of silver nanoparticles. Moreover, the cotton
colorated with silver nanoparticles showed reasonably good color fastness
to washing, which will facilitate the practical application of this
coloration process.
Cleanup of oil spills and industrial discharge of organic solvents is a global challenge. However, development of the ideal materials for water remediation with a high separation efficiency and low risk of fire is still rather sparse because the material needs to be superhydrophobic/superoleophilic and also flame‐retardant. Here, a novel coating material of porous boron nitride nanosheets (BNNSs) and a layer‐by‐layer assembly technology for tailoring inexpensive cotton fabric and melamine sponge with these desired properties are reported. The BNNS‐coated cotton fabric and melamine sponge exhibit high oil/water separation efficiency, selective absorption capacity of oil and organic solvents, and excellent recyclability. Furthermore, the coated materials show an efficient flame‐retardant effect which completely stops melamine sponge melt dripping upon exposure to the direct flame from a butane blowtorch within 52 s. The integrated advantages of the high porosity, low water adhesion, compressibility, strong fire‐resistance, simple operation, and commercial availability enable the porous BNNS‐coated cotton fabric and melamine sponge to satisfy various practical oil/water separation requirements.
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