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| Fabrication of Super hydrophobicity of cotton fabric treated with silica Nano particles and water repellent agent |
Hasabo Bagi Mohamed Ahmed, Rahma Adam Aissa Hassan
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Abstract:
To obtain the super hydrophobic water-repellent cotton fabrics, cotton fabrics were treated with silica nanoparticles and/or a cost-effective water-repellent agent (WR agent). Two different silica nanoparticles were synthesized via a sol-gel process and their shapes, sizes, and compositions were characterized. It was found that silica particles are spherical and have diameters of 150 and 300 nm. For the cotton fabrics treated with the WR agent alone the water contact angles on the fabric surface remained lower than 20°approximately at the WR agent concentration of 0.3 wt% or less. Silica nanoparticle treatment itself did not change the hydrophilic surface of cotton fabric indicating that water drops were absorbed into fabrics due to the hydroxyl groups on both cotton and silica nanoparticle surfaces. However for the cotton fabrics treated with both silica nanoparticles and the WR agent a contact angle above 75°can be obtained even at the very low WR agent concentration of 0.1 wt%. Therefore, super hydrophobic cotton fabrics could be obtained the combined treatment of silica nanoparticle and WR agent, which is cost effective com-pared with fluorinate silane treatment.
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