چكيده به لاتين
Abstract:
The hydrophobic powder containing unmodified copper oxide, with the micro-nano hierarchical structure, was prepared in a single step using a simple and low-cost hydrothermal method. Experiments were performed based on the combined Taguchi design to investigate the effect of parameters: the ratio of hexamine to copper salt, type of structure directing agents, the concentration of structure directing agents and reaction temperature at three levels. The powders have been modified with palmitic acid to enhance the superhydrophobicity and to investigate the effect of chemical modifiers. The confirmatory test was performed on the process parameters under the predicted optimal conditions. The results of the Taguchi design show that the type of structure orientation factors plays an important and fundamental role in the hydrophobic properties. Crystalline phase analysis, surface morphology, chemical composition, topography and contact angle of 5 μl water droplet on the powder were investigated by XRD, SEM, FTIR and optical microscopy. The contact angle of the drop is in the range of 111.8̊ to 156.7̊ and the highest contact angle of the nanostructures was before chemical modification of 159.6̊. The results of the SEM test show that a hierarchical micro-nano structure rod, urchin and needle like such as after the hydrothermal reaction was formed for 8 h. The XRD results also show that the sample contains copper oxide. The results of FTIR analysis also show the oxygen bonded metal and OH bond and non bonded OH bond. Hydrophobic powder under optimum conditions had a contact angle of about 158.4 degrees. To further investigate the factors, experiments were conducted under the Investigation of one Factor at a Time (OFAT).
Keywords: powder- nanostructure- hydrophobic- copper oxide- hydrothermal- contact angle.
