Methods To Deposition Superhydrophobic Flims By Atomospheric Pressure Plasma With Properties Researching

Superhydrophobic surface is which the droplet contact angle is greater than 150°,which has many excellent properties such as self-cleaning,friction reduction and corrosion resistance.It has great application value in the fields of building anti-fouling and pipeline friction reduction.Superhydrophobic films were deposited by atmospheric pressure plasma have the advantages of low cost,simple operation and low energy consumption.In this paper,a single electrode atmospheric pressure argon plasma and a needle-ring electrode atmospheric pressure nitrogen plasma have been constructed to deposit superhydrophobic films in the plane and in the micro-tube.The method which has the characteristics of high efficiency,wide application range,simplicity and convenience can quickly deposit superhydrophobic films.In this paper,research has been carried out from the aspects of the construction of experimental equipment,experimental parameters optimization of the length of plasma jet,the experimental parameters optimization of the wettability of the deposited film and the properties of the deposited superhydrophobic film.The specific research contents are shown in the following:(1)Superhydrophobic films were deposited by argon plasma with single electrode.The single electrode atmospheric pressure argon plasma generator was built.The length characteristics of argon plasma jet were researched.The influence of experimental parameters on the wettability of deposited films was studied.The surface morphology,chemical element composition and group composition of superhydrophobic films deposited by atmospheric argon plasma were analyzed by scanning electron microscopy,surface element measurement and Fourier transform infrared spectroscopy.Adhesiveness of superhydrophobic film was measured by adhesive property test and droplet bounce test.Finally,the biofriendliness of superhydrophobic flims were proved by cultivating Hela cells,Escherichia coli,clover and purslane seeds on the deposition patterned superhydrophobic films.(2)Superhydrophobic films were deposited by nitrogen plasma with needle-ring electrode.A needle-ring electrode atmospheric pressure nitrogen plasma generator was bulit and the characteristics of nitrogen plasma jet length were researched.Superhydrophobic films were successfully deposited by this device.The surface morphology test shows that the deposited superhydrophobic film has a coral-like micro-nano structure.Surface group test shows that the deposited films have hydrophobic groups.Finally,the differences of adhesion properties of superhydrophobic surface with different deposition time were explored by calculating the recovery coefficient of droplet bounce at low Weber number.At high Weber number,the contact time between the droplet and the substrate during the droplet bounce is used to explore the stability of the superhydrophobic surface with different deposition time.(3)Superhydrophobic films were deposited in the microtubes by needle-ring electrode atmospheric pressure nitrogen plasma.The uniformity of superhydrophobic films deposited in microtubes was verified by measuring the contact angles of films deposited in different microtubes diameters.The roughness,transmittance and surface topography of the superhydrophobic films deposited in tubes were measured at the beginning point,the middle point and the end point respectively by atomic force microscope,optical fiber spectrometer and scanning electron microscope.The surface friction coefficients of superhydrophobic films deposited in different pipe diameters and different materials were calculated.Finally,the ability of acid and alkali resistance of superhydrophobic films deposited in microtubes was tested.