Article Dans Une Revue Sensors and Actuators B: Chemical Année : 2007

Hydrophilization and hydrophobic recovery ofPDMS by oxygen plasma and chemical treatment—An SEM investigation

Résumé

Rapid prototyping of polydimethylsiloxane (PDMS) is frequently used to build microfluidic devices. PDMS is inherently hydrophobic; however, the surface can be temporarily rendered hydrophilic by exposing the surface to oxygen plasma. Hydrophilic microchannels are sometimes advantageous over hydrophobic microchannels due to increased cell adhesion or increase in electro osmotic flow (EOF) leading to ease of liquid filling in microchannels. However, the hydrophilic surface is unstable and that low molecular weight (LMW) chains diffuse from the bulk of the PDMS and cover up the thermodynamically unstable surface. This is one reason for the hydrophilic unstability of PDMS. Present study shows that not only chemistry of the creation of silanol groups on the surface, but also morphology of the film surface nanostructuring of PDMS plays an important role in hydrophilization of PDMS. Present paper tries to understand the mechanism of hydrophobic recovery taking into consideration physical and chemical parameters using SEM characterization.

Fichier non déposé

Dates et versions

hal-00142761 , version 1 (21-04-2007)

Identifiants

  • HAL Id : hal-00142761 , version 1

Citer

Dhananjay Bodas, Chantal Khan Malek. Hydrophilization and hydrophobic recovery ofPDMS by oxygen plasma and chemical treatment—An SEM investigation. Sensors and Actuators B: Chemical, 2007, 123, pp.368-373. ⟨hal-00142761⟩
205 Consultations
0 Téléchargements

Partager

  • More