Surface hydrophobic modification of cellulose membranes by plasma-assisted deposition of hydrocarbon films

Abstract

Surface modification by plasma polymerization is an efficient method to change the surface properties of a membrane. Desirable functionality such as hydrophobicity or hydrophilicity can be obtained, depending on plasma chemistry of gas precursors and discharge conditions. In this work, RF magnetron plasma is produced using acetylene and nitrogen as precursor gases. Variations of RF power, particle flux, deposited time and pressure of the precursor gases have been made to observe coating effects on the cellulose membranes. When appropriated conditions are used, a thin brownish film of hydrocarbon was formed on the membrane, and the water contact angle increased from 35 to 130 degrees.

Keywords

• cellulose membrane
• reactive plasma
• acetylene
• RF discharge
• Hydrocarbon
• Contact angle
• Hydrophobic
• Hydrophilic