Table 1 A summary of all the experimental data presented in this work
From: Biomimetic coating-free surfaces for long-term entrapment of air under wetting liquids
Simple cavities (SCs) | Reentrant cavities (RCs) | Doubly reentrant cavities (DRCs) | ||||
|---|---|---|---|---|---|---|
Water | Hexadecane | Water | Hexadecane | Water | Hexadecane | |
Circular (Circ|100) | ||||||
θPr | 130° | 90° | 130° | 127° | 128° | 125° |
θr | 113° ± 3° | 65° ± 1° | 125° ± 3° | 118° ± 5° | 124° ± 2° | 114° ± 3° |
θA | 118° ± 4° | 72° ± 4° | 141° ± 2° | 137° ± 2° | 139° ± 3° | 134° ± 4° |
ϕLV | 0.81 | 0 | 0.81 | 0.81 | 0.81 | 0.81 |
ϕLS | 0.19 | 1.81 | 0.21 | 0.21 | 0.24 | 0.24 |
tfailing | t = 50 min | Instantaneous | 3 h | >48 h | 4.5 h | >27 days |
Mode of failure | Capillary condensation | Imbibition | Capillary condensation | Did not fail | Capillary condensation | Did not fail |
P (kPa) | 0 | 103 ± 1 | 110 ± 1 | |||
Square (corner radius 3 μm – Sq|3) | ||||||
θPr | 90° | 90° | 142° | 140° | 139° | 137° |
θr | 96° ± 4° | 77° ± 2° | 137° ± 3° | 133° ± 3° | 136° ± 1° | 129° ± 2° |
θA | 111° ± 2° | 83° ± 3° | 146° ± 5° | 151° ± 1° | 153° ± 1° | 144° ± 2° |
ϕLV | 0 | 0 | 0.89 | 0.89 | 0.89 | 0.89 |
ϕLS | 1.88 | 1.88 | 0.13 | 0.13 | 0.17 | 0.17 |
tfailing | Instantaneous | Instantaneous | 1.5 h | 6 h | 3 h | 7 h |
Mode of failure | Imbibition along corners | Imbibition along corners | Capillary condensation | Failure at corners | Capillary condensation | Failure at corners |
P (kPa) | – | – | 96 ± 1 | 103 ± 1 | ||
Square (corner radius 50 μm – Sq|50) | ||||||
θPr | 90° | 90° | 135° | 132° | 133° | 130° |
θr | 112° ± 2° | 83° ± 5° | 134° ± 1° | 127° ± 4° | 135° ± 2° | 120° ± 2° |
θA | 127° ± 3° | 85° ± 4° | 143° ± 6° | 147° ± 1° | 151° ± 2° | 143° ± 1° |
ϕLV | 0 | 0 | 0.84 | 0.84 | 0.84 | 0.84 |
ϕLS | 1.79 | 1.79 | 0.17 | 0.17 | 0.20 | 0.20 |
t failing | Instantaneous | Instantaneous | 2 h | 27 h | 5 h | 16 h |
Mode of failure | Imbibition along corners | Imbibition along corners | Capillary condensation | Failure at corners | Capillary condensation | Failure at corners |
P (kPa) | – | 100 ± 1 | 118 ± 1 | |||
Hexagonal (corner radius 3 μm - Hex|3) | ||||||
θPr | 90° | 90° | 142° | 140° | 139° | 137° |
θr | 98° ± 7° | 23° ± 3° | 132° ± 2° | 125° ± 3° | 134° ± 3° | 124° ± 3° |
θA | 126° ± 1° | 33° ± 2° | 149° ± 1° | 141° ± 2° | 146° ± 1° | 139° ± 1° |
ϕLV | 0 | 0 | 0.89 | 0.89 | 0.89 | 0.89 |
ϕLS | 1.86 | 1.86 | 0.13 | 0.13 | 0.17 | 0.17 |
tfailing | Instantaneous | Instantaneous | 3 h | 8 h | 4 h | 9 h |
Mode of failure | Imbibition along corners | Imbibition along corners | Capillary condensation | Failure at corners | Capillary condensation | Failure at corners |
P (kPa) | – | – | 106 | 106 | ||
Hexagonal (corner radius 50 μm –Hex|50) | ||||||
θPr | 90° | 90° | 139° | 136° | 136° | 133° |
θr | 106° ± 2° | 54° ± 1° | 132° ± 2° | 122° ± 3° | 128° ± 2° | 124° ± 3° |
θA | 124° ± 2° | 61° ± 2° | 148° ± 2° | 143° ± 2° | 141° ± 4° | 137° ± 2° |
ϕLV | 0 | 0 | 0.87 | 0.87 | 0.87 | 0.87 |
ϕLS | 1.44 | 1.44 | 0.15 | 0.15 | 0.19 | 0.19 |
tfailing | Instantaneous | Instantaneous | 1.5 h | >48 h | 4 h | 30 h |
P (kPa) | – | 103 ± 1 | 120 ± 1 | |||
Mode of failure | Imbibition along corners | Imbibition along corners | Capillary condensation | Did not fail | Capillary condensation | Failure at corners |
