Effect of hydrophilic polymers on the wettability, static and dynamic, of solid substrate covered by confluent monolayer of air-damaged SIRC cells

Figures & data

Table 1. Main characteristics of polymers.

Name	CAS no.	Average Mw	Concentrations used (%)	Manufacturer
HEC	71888-87-4	1,000,000	0.01, 0.10, 0.20, 0.40, 0.60	Sigma–Aldrich
HPMC	9004-65-3	75,000	0.01, 0.10, 0.20, 0.30, 0.40	Sigma–Aldrich
SCS	9082-07-9	500	0.01, 0.05, 0.10, 0.30, 0.50	Plantsman ltd.
PO12	9003-11-6	12,688	0.01, 0.025, 0.05, 0.075, 0.10	BASF

Figure 1. Dependence of the equilibrium contact angle (θ) between static air bubble and solid surface covered with air-damaged SIRC on polymer concentration. Zero per cent polymer concentration corresponds to control, i.e. pure saline solution with no polymer dissolved.

Figure 2. Dependence of the advancing contact angle (θ) between air bubble at contraction and solid surface covered with air-damaged SIRC on polymer concentration. Zero per cent polymer concentration corresponds to control, i.e. pure saline solution with no polymer dissolved.

Figure 3. Dependence of the receding contact angle between air bubble at expansion and solid surface covered with air-damaged SIRC on polymer concentration. Zero per cent polymer concentration corresponds to control, i.e. pure saline solution with no polymer dissolved.

Table 2. Dependence of the average contact angle on the polymers concentration.

Polymer	HEC	HPMC	SCS	PO12
Concentration (%)	Average contact angle (°)
(Control) 0.000	40.79	40.19	40.19	41.63
0.010	40.20 ± 0.08	38.46 ± 0.07	39.23 ± 0.09	41.49 ± 0.06
0.025	–	–	–	40.19 ± 0.08
0.050	–	–	38.56 ± 0.08	39.10 ± 0.08
0.075	–	–	–	37.46 ± 0.07
0.100	36.49 ± 0.04	38.39 ± 0.07	38.51 ± 0.04	36.37 ± 0.07
0.200	35.33 ± 0.05	38.04 ± 0.13	–	–
0.300	–	36.32 ± 0.12	38.17 ± 0.06	–
0.400	35.23 ± 0.16	35.51 ± 0.05	–	–
0.500	–	–	34.83 ± 0.15	–
0.600	33.11 ± 0.22	–	–	–

Figure 4. Dependence of the advancing contact angle (θ) on the distance travelled by the bubble edge (R) over the cell covered surface of the solid support for each polymer concentration: HEC (A), HPMC (B), PO12 (C), SCS (D).

Figure 5. Dependence of the receding contact angle (θ) on the distance travelled by the bubble edge (R) over the cell covered surface of the solid support for each polymer concentration: HEC (A), HPMC (B), PO12 (C), SCS (D).