Coating with Commercial Native or Synthetic Polymers

2 Coating with Commercial Native or Synthetic Polymers 

Surface activation to create radicals by the same scheme as described above After the plasma treatment, the substrate is kept in an air atmosphere and most of the radicals formed are oxidized to give oxygen functionalities (-C-OH, -C=0, etc.). As a result of the activation, the surface energy of the substrate increases and allows the uniform deposition of the coating. 

Coating with native and synthetic polymers This simply involves dipping the substrate into the aqueous solution of the native or synthetic polymer and subsequent drying. Finally, the polymer film coats all the substrate to a thickness that depends on the dilution. 

It appears that the coating resists any removal operation such as Soxhlet extraction more strongly than a simple deposition without any pre-activation. Some radicals formed during the plasma treatment would probably react with the polymer film. Surface examination by XPS analysis [5] before and after washing with water (Table 12.3) and even with phosphate detergent (e.g., with one of the solutions usual in hospitals, such as RBS detergent, consisting of a mixture of 

When biological tests are applied, all the samples are prepared in a clean room (class 100). 

---