Table 1 Contact angle and surface free energy of B particles, SA/B composite particles, and SA@B composite particles.

From: Combustion and mechanical properties enhancement strategy based on stearic acid surface activated boron powders

Samples

Contact angle (°)

Surface free energy (mJ m-2)

Water

Diiodomethane

\({\text{r}}_{\text{s}}^{\text{d}}\)

\({\text{r}}_{\text{s}}^{\text{p}}\)

\({\text{r}}_{\text{s}}\)

B

18.7

126.1

45.1

12.0

57.1

SA/B

23.5

122.6

2.77

75.6

78.3

SA@B

145.0

27.9

2.14

80.4

82.5