title: Contact angle measurements under thermodynamic equilibrium conditions.
abstract: The precise control of the ambient humidity during contact angle measurements is needed to obtain stable and valid data. For a such purpose, a simple low-cost device was designed, and several modified surfaces relevant to biosensor design were studied. Static contact angle values for these surfaces are lower than advancing contact angles published for ambient conditions, indicating that thermodynamic equilibrium conditions are needed to avoid drop evaporation during the measurements.
authors.affiliation: Laboratorio de Biomateriales, Instituto de Química Biológica, Facultad de Ciencias, Universidad de la República, Iguá 4225 casi Mataojo, 11400, Montevideo, Uruguay.
authors.forename: Carol
authors.initials: C
authors.lastname: Lages
authors.forename: Eduardo
authors.initials: E
authors.lastname: Méndez
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D011506:Proteins; D012107:Research Design; D013499:Surface Properties; D013816:Thermodynamics; D017155:Wettability
chemical_list: D011506:Proteins