Table 4 Advancing (ACA) and receding contact angles (RCA) of water, apparent surface free energy and the specific surface area (SSA)
From: Modified silicas with different structure of grafted methylphenylsiloxane layer
No. | Scheme of modification | Advancing contact angle θ a (deg.) | Receding contact angle θ a (deg.) | Apparent surface free energy γ S (mJ/m2) | SSA (BET) | aCarbon content (CNH). wt % | Carbon content (XPS). wt % |
|---|---|---|---|---|---|---|---|
Protocol 1 (modifying mixture portion on tree stages—25/35/40 vol%) | |||||||
1 | L-S | 134 | 130 | 10 | 126 | 8.9 | 10.5 |
2 | M | 121 | 109 | 15 | 118 | 9.1 | 11.2 |
3 | S-L | 109 | 94 | 21 | 133 | 7.5 | 8.9 |
Protocol 2 1 (modifying mixture portion on tree stages—40/35/25 vol%) | |||||||
4 | S-L | 125 | 118 | 14 | 154 | 9.6 | 11.2 |
5 | M | 131 | 120 | 11 | 139 | 9.2 | 10.9 |
6 | L-S | 146 | 136 | 5 | 146 | 9.3 | 11.0 |