An evaluation of methods for contact angle measurement. Journal   Colloids and surfaces. B, Biointerfaces. Citation   Colloids Surf B Biointerfaces. 43(2):95-8 Publication date   2005 Jun 25 Authors   Krishnan A Liu YH Cha P Woodward R Allara D Vogler EA Hematology at Biomaterial Interfaces Research Group Investigators   Erwin Vogler Grant agencies   National Heart, Lung, and Blood Institute Grants   NHLBI 1 R01 HL69965-01 Abstract   A systematic comparison of Wilhelmy-balance tensiometry (WBT), tilting-plate goniometry (TPG) and captive-drop goniometry (CDG), using a variety of silane-treated glass surfaces of variable wetting characteristics is reported. WBT was assumed to be the benchmark of comparison (gold standard). Advancing angles measured by TPG and CDG were in statistical agreement with corresponding WBT measurements. In contrast, receding angles from both goniometric techniques were systematically higher than WBT.