Influence of Surface Properties on the Adhesion of Staphylococcus epidermidis to Acrylic and Silicone

Table 1

Water (𝜃_𝑊), formamide (𝜃_𝐹), and α-bromonaphtalene (𝜃_𝛼-𝐵) contact angles (in degrees), surface tension components, and hydrophobicity (in mJ/m²) of the acrylic and silicone coupons surface.

Substratum	Contact angle  ±  SD (^°)			Surface tension components (mJ/m^2)			ΔGiwi (mJ/m^2)
	𝜃𝑊	𝜃𝐹	𝜃𝛼-𝐵	𝛾^LW	𝛾^+	𝛾^−
Acrylic	85.3±2.2	64.1±1.2	24.5±1.2	40.5	0.0	4.5	−62.5
Silicone	114.5±2.3	104.3±2.4	81.4±3.5	14.7	0.4	1.7	−67.1

SD: standard deviation; 𝛾^LW: apolar Lifshitz-van der Waals surface free energy component; 𝛾⁺: electron acceptor surface free energy component; 𝛾⁻: electron donor surface free energy component; ΔG_iwi: degree of hydrophobicity.