《1 Preparation methods》由会员分享，可在线阅读，更多相关《1 Preparation methods（5页珍藏版）》请在金锄头文库上搜索。
1、1 Preparation methodsMethodsAdvantagesDisadvantagesSteam induced phase separation methodRaw material sourcesProcess is conciseLow costThe size on the surface preparation is not restrictedFilm strength is not good enoughTemplates printing methodConciseEffectiveAccurateCheapMassive replication/Sol-gel
2、 methodFor inorganic super hydrophobic materials such as the preparation of ZnO and TiO2 and Al2O3A longer processA solvent pollutionThe high cost.Template extrusion methodThe effect is goodProcess is relatively simpleNeed to obtain cheap, template size and reliable performanceLaser and plasma etchi
3、ng methodEasy to get high transparency of super hydrophobic LDPE filmEquipment expensive High cost Super hydrophobic meter area is limitedSuperhydrophobic Coatings/1. 1 Steam induced phase separation methodUnder certain conditions, when the polymer solution in the process of solvent evaporation, sol
4、ution thermodynamics condition is not stable, easy happening between polymer chain from gathered themselves together, and then form the gathering phase. When the polymer chain is gathered to a certain extent, the macromolecule aggregation and form the phase separation process, and form a micron - na
5、noscale rough surface of the structure,then the membrane method is called steam induced phase separation method.Steam induced phase separation has the advantages of wide material sources, simple process, low cost, and the size on the surface preparation is not restricted, but the film strength is no
6、t enough good.1. 2 Templates printing methodSuns group1 uses of lotus leaf as the original template for PDMS concave template, then they use the PDMS convex concave template template. The convex template is replica of a lotus leaf, and it has the same surface structure with lotus leaf, thus it is sh
7、owing good super hydrophobic and low rolling Angle.The process is similar to print, so we called it template printing method.Template printing method is a simple, effective, accurate, cheap and massive replication preparation method. It is expected to become the practical of the important methods fo
8、r preparation of super hydrophobic material.1. 3 Sol-gel methodSol-gel method is to use compound containing high chemical activity components for hydrolysis after get sol precursor to the condensation reaction, and then form stable gel in solution, the last is the gel drying.After the solvent remova
9、l, sometimes it may leave a small nanopores, these micro/nano pore structure gives us some special properties, including super hydrophobic.Sol-gel method has certain advantages for inorganic super hydrophobic materials such as the preparation of ZnO2 and TiO23 and Al2O34, but there is the longer pro
10、cess route, high cost and solvent pollution shortcomings.1. 4 Template extrusion methodTemplate extrusion method is to use the aperture to the nanoscale porous alumina film as a template, it can dissolve in solvent polymer drop on it, then get super hydrophobic surface after drying. Feng Lin5 throug
11、h template extrusion method with hydrophilic poly (vinyl alcohol) material to get the preparation of super hydrophobic surface, contact Angle can reach 171. 2 . This may be due to pva molecular rearrangement in the nano structure, which makes the situation that hydrophobic alkyl groups to the outsid
12、e, hydrophilic hydroxyl groups and form intermolecular hydrogen bond, then inward system can reduce the surface (figure 6). Jin Meihua6 through templates to the extrusion polystyrene by super hydrophobic array nanotubes film. The film not only has super hydrophobic properties, also has a super high
13、viscous force to water, even the water completely reversed sticktite, similar to gecko foot (figure 7).Template method of extrusion effect is good, and the craft is simpler, but how to get a cheaper price, size and reliable performance of the template is the key.1. 5 Laser and plasma etching methodK
14、horasanis group7 use CO2 laser conduct the polydimethylsiloxane (PDMS) at room temperature environment, and the surface of the WCA up to 175 . The possible reasons is that after laser treatment, PDMS surface will form porous structure, withgood molecular chain arrangement of PDMS neat. Fresnaiss gro
15、up8 under oxygen atmosphere use plasma processing LDPE film, and then treated with plasma in CF4 atmosphere, to get high transparency of super hydrophobic LDPE film. In addition, it also has the records in Teshima9 and Lacroix10 that use plasma etching method to obtain the ultra thin on the surface
16、of the water meter .But the class methods exist some problems that the expensive quipment, high cost, super hydrophobic meter area is limited.1. 6 Superhydrophobic Coatings Attribute and Usage InformationA super-hydrophobic coating is a nanoscopic surface layer that repels water. Super-hydrophobic coatings can be made from man
