Capillary Array: Al2O3 Coating

This type of coating is made of aluminum oxide, which is a ceramic material that has high hardness, wear resistance, and thermal stability. Al2o3 coating can reduce or eliminate the electroosmotic flow (EOF) in the capillary, which can improve the separation reproducibility and stability. Al2o3 coating can also prevent oxidation of the fused-silica glass. However, al2o3 coating may have poor adhesion to the capillary wall and may crack or peel off under high electric fields or thermal stress