What process is used for the oleophobic filter membrane, and which products use the oleophobic filte

An oleophobic filter membrane is a surface treatment or coating that repels oil and other non-polar substances. It is commonly used in a variety of applications to reduce smudges, fingerprints and improve the overall cleanliness of surfaces. The process of making oleophobic filtration membranes involves applying a thin layer of oleophobic material to the surface, which can be achieved by various methods such as dipping, spraying or vapor deposition.

Each of the three coating methods mentioned above has its advantages and disadvantages, and the choice of method depends on the specific requirements of the application. Dip coating is a simple and cost-effective method of coating high-volume filter membranes, while spraying allows more precise control of coating thickness and uniformity. Vapor deposition is a high-tech method that can produce very thin and uniform coatings, but it is also relatively complex and expensive. The three processes are briefly described below:

1. Dip coating: In dip coating, the filter membrane is immersed in the coating solution, and then slowly pulled out at a constant rate. The extraction rate and concentration of the coating solution determine the thickness of the coating layer. The coated filter membrane is then dried or cured as desired.

2. Spraying: In spraying, the coating solution is atomized into small droplets, and then sprayed onto the filter membrane using a spray gun or nozzle. The droplets are pushed towards the membrane by gas or air pressure. The thickness of the coating is controlled by adjusting spray parameters such as pressure, nozzle size and distance from the membrane.

3. Vapor deposition: In vapor deposition, the coating material evaporates from the source and then condenses onto the filter membrane. This is usually done in a vacuum chamber to avoid contamination. The thickness of the coating is controlled by adjusting the deposition time and rate.

Some common products that use oleophobic membranes include:

Smartphones and Tablets: Reduces fingerprints and smudges on touchscreens, making them easier to clean and improving appearance.

Optical Lenses: Minimizes smudges and smudges on glasses, camera lenses and other optical equipment for clearer vision and better image quality.

Medical devices: Prevent contamination and improve surface cleanliness, especially in sterile environments.

Automotive Displays: Reduces smudges and glare on automotive displays, making them more visible and easier to read.

Wearables: Minimize smudges on smartwatches and other wearables with touch interfaces.

The above are some conclusions about oleophobic filtration, not all products in these categories require oleophobic membranes, their use depends on the specific application and desired characteristics of the product.

Citation

1.Chen, J., & Luo, S. (2018). Dip-coating of membranes for water treatment: A review. Journal of Membrane Science, 563, 361-380. https://doi.org/10.1016/j.memsci.2018.06.029

2.Ma, Y., & Shi, W. (2019). Spray coating of membranes for water treatment: A review. Journal of Membrane Science, 583, 257-277. https://doi.org/10.1016/j.memsci.2019.03.009

3.Bae, T. H., & Tak, T. M. (2018). Spray-coating methods for polymer membrane preparation: A review. Journal of Membrane Science, 566, 162-179. https://doi.org/10.1016/j.memsci.2018.08.003

4.Wang, D., Dong, C., Li, X., & Wang, Z. (2018). Vapor deposition methods for the fabrication of polymeric membranes: A review. Journal of Membrane Science, 564, 110-133. https://doi.org/10.1016/j.memsci.2018.07.004