Preparation And Preliminary Application Of Nano-superhydrophobic Functional Materials

The super-hydrophobic materials were widely applied in the fields of transportation,building appearance cleaning,fluid transportation,and environmental and medical treatments.However,organic contaminants?such as dyes,etc.?may be absorbed onto the super-hydrophobic surfaces too tightly to be removed,which may largely prevent the super-hydrophobic surfaces from self-cleaning.In this thesis,two kinds of super-hydrophobic materials were fabricated.On the one hand,nano-scaled titanium dioxide?TiO₂?as photocatalyst was doped into the polycarbonate?PC?matrix to construct a super-hydrophobic coating for the photocatalytic degradation of organic dyes under the visible light.On the other hand,the super-hydrophobic nanocomposites were successfully prepared by using nano-scaled SiO₂ that were modified with dimethyl-dimethoxy-silane?Me₂Si?OMe?₂?to realize the oil-water separation in wastewater.?1?A super-hydrophobic coating with visible-light photocatalysis was prepared for the catalytic degradation and self-cleaning of organic contaminants on the substrates of different materials?Chapter 2?.The dopamine?DA?was used to reduce the silver ions?Ag+?to be deposited onto the surfaces of nano-scaled titanium dioxide?TiO₂?forming DA-Ti O₂?Ag?composites that were further doped into the PC matrix.DA-TiO₂?Ag?@PC nanocomposite films were created by means of the phase separation by following the simple "dipping and drying" procedure,followed by the etching treatment with dimethylbenzene?DMB?.The super-hydrophobic coating of E-DA-Ti O₂?Ag?@PC were thus obtained onto the substrates of different materials that were preliminarily patterned with glue to improve the adhesion stability of the coatings.The results indicate that,on the one hand,the use of DA could not only aid to the firm deposition of Ag onto the surfaces of nano-scaled TiO₂,but also greatly enhance the absorption efficiency of visible light of nano-scaled TiO₂.On the other hand,the introduction of Ag contents into the DA-Ti O₂?Ag?coatings could improve their efficiencies of photocatalytic degradation for organic compounds under visible light.The so prepared super-hydrophobic coatings could thereby achieve the powerful function of photocatalytic degradation of organic contaminants showing the effective self-cleaning of the surfaces.In addition,silver ions could in a way endow the coatings with the antibacterial properties,promising the wide applications for the surface treatment of medical and sanitary equipments.?2?Preparation of super-hydrophobic composites with dimethyl-dimethoxy-silane-modified nano-scaled SiO₂ for the preliminary applications of oil-water separation?Chapter 3?.Nano-Si O₂ were modified with Me₂Si?OMe?₂ by using isopropanol as solvent,of which the hydrophilicity was changed to obtain the super-hydrophobic properties.Following the sol-gel route,the SiO₂/Me₂Si?OMe?₂ super-hydrophobic composites were mixed with epoxy resin as the adhesive agent to obtain the powerful stick or cake-like super-hydrophobic composites.The as-prepared super-hydrophobic composites were coated onto the surfaces of different substrates of various materials,which super-hydrophobic properties were investigated under the conditions of low temperature,high temperature,harsh acid and alkali,and high salinity.The results indicate that the super-hydrophobic composites can be applied to achieve the super-hydrophobic coatings on the surfaces of different materials under various harsh environments.At the same time,the oil and water separation of the oily wastewater was successfully realized by using the super-hydrophobic composites.