Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Fabrication of superhydrophobic and antibacterial surface on cotton fabric by doped silica-based sols with nanoparticles of copper | Berendjchi et al. Nanoscale Research Letters 2011 6 594 http content 6 1 594 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Fabrication of superhydrophobic and antibacterial surface on cotton fabric by doped silica-based sols with nanoparticles of copper Amirhosein Berendjchi1 Ramin Khajavi1 and Mohammad Esmaeil Yazdanshenas2 Abstract The study discussed the synthesis of silica sol using the sol-gel method doped with two different amounts of Cu nanoparticles. Cotton fabric samples were impregnated by the prepared sols and then dried and cured. To block hydroxyl groups some samples were also treated with hexadecyltrimethoxysilane. The average particle size of colloidal silica nanoparticles were measured by the particle size analyzer. The morphology roughness and hydrophobic properties of the surface fabricated on cotton samples were analyzed and compared via the scanning electron microscopy the transmission electron microscopy the scanning probe microscopy with static water contact angle SWC and water shedding angle measurements. Furthermore the antibacterial efficiency of samples was quantitatively evaluated using AATCC 100 method. The addition of wt wt Cu into silica sol caused the silica nanoparticles to agglomerate in more grape-like clusters on cotton fabrics. Such fabricated surface revealed the highest value of SWC 155 for a 10-pl droplet due to air trapping capability of its inclined structure. However the presence of higher amounts of Cu nanoparticles 2 wt wt in silica sol resulted in the most slippery smooth surface on cotton fabrics. All fabricated surfaces containing Cu nanoparticles showed the perfect antibacterial activity against both of gram-negative and gram-positive bacteria. Keywords cotton superhydrophobicity antibacterial sol-gel method contact angle Background Studying over 200 species of water repellent plants Neinhuis and Barthlott 1 found an ideally wonderful superhydrophobic effect
