Shell material (O)

Paraffin wax (m. p. 75˚C, ρ = 0.77g/cm³) = 20 g

Oil soluble surfactant

Poem PR-100 (HLB = 0.3)

C_s = 0 - 10 wt% − paraffin wax

Core material (W)

Azur B = 0.1 g

Water phase

5 ml, 10 ml, 20 ml

Conc. of Azur B

2.0 wt%, 1.0 wt%, 0.5 wt%

Continuous phase (O’)

silicone oil = 400 g

Oil soluble surfactant

Poem J0021 2.0 wt%-silicone oil

Agitation velocity and time for preparing the (W/O) emulsion

5000 rpm, 10 min

Agitation velocity and time for preparing the (W/O)/O’ emulsion

200 rpm, 5 min

Hold-up in the (W/O) emulsion

φ = 0 (powder only), 0.24 (5 ml), 0.39 (10 ml), 0.56 (20 ml)