Calculating the five-component surface energy profile from contact angles (goniometry)
With a purpose to simplify goniometric determination of surface energies via the van Oss-Chaudhury-Good equation, this dataset illustrates the ability to use a spreadsheet containing the surface tension components of three fully characterized liquids (e.g., 1-bromonaphthalene, formamide, and water) to linear algebraically and simultaneously solve for three surface energy components of a substrate (e.g., nonpolar, acid, and base components). The aforementioned components are then used to determine the substrate's acid-base component and the overall surface energy. Together the surface energy components provide a five-component surface energy profile that can enable the prediction of the interfacial properties of the substrate with an interacting material. The substrate could be any solid or semi-solid such as, but not limited to, metal, ceramic, glass, polymer, plastic, gel, biomacromolecule, or uniform, planar biologic surface.
Steps to reproduce
First, contact angle measurements (CAs) should be performed with a goniometric device using three fully characterized liquids. We suggest using 1-bromonaphthalene, formamide, and deionized water because they have relatively high boiling points and significant surface tension values. A minimum of six CAs should be recorded for each fully characterized liquid for increased confidence and more accurate statistics. Next in reference to the Linear Algebraic Surface Energy Determination TEMPLATE.xlsx, the user inputs data (i.e., the sample identity and measured CAs, both highlighted) into Sheet 1) INPUT Highlighted ID & CAs. Following data input, Sheet 2) Calculations determines the surface energy of the desired substrate and requires little to no modification by the user. Finally, Sheet 3) Surface Energy Results aggregates the surface energy results and meaningful statistics into two different tables for ease of reporting.