Fig. 1

SEM image of ultrafine pearl powder"

Fig. 2

Apparent photos of ultrafine pearl powder dispersed in different media: （a） 1 min after preparation, （b） 24 h after preparation"

Fig. 3

Appearance photos of Pickering emulsions prepared by different ultrafine pearl powder dosage: （a） 24 h after preparation, （b） 1 week after preparation"

Fig. 4

The optical micrographs of Pickering emulsions prepared by different dosage of ultrafine pearl powder: A, B, C, D represent the stable emulsion with pearl powder at the concentration of 1.5%, 2.0%, 2.5 % and 3.0 % after 24 h, respectively; A', B', C', D' mean the emulsions with the same mass fraction of pearl powder as A, B, C, D after 1 week"

Fig. 5

Appearance （a） and EI （b） of Pickering emulsions stabilized by different ultrafine pearl powder dosage, 1 week after preparation"

Fig. 6

Appearance and microscope photos of Pickering emulsions stabilized by different oil-water mass ratios: （A） 1:9, （B） 2:8, （C） 3:7, （D） 4:6, （E） 5:5, （F） 6:4, （G） 7:3, （H） 8:2 and （I） 9:1, 24 h after preparation; A', B', C'...H' mean the emulsions with the same oil-water mass ratio as A, B, C...H, 1 week after preparation"

Fig. 7

Appearance（a） and EI（b） of Pickering emulsions stabilized by different oil-water mass ratios, 1 week after preparation"

Fig. 8

Appearance and microscope photos of Pickering emulsions stabilized by different sodium chloride concentrations, 24 h after preparation: （A） 0 mmol/L, （B） 0.5 mmol/L, （C） 1.0 mmol/L, （D） 5.0 mmol/L, （E） 10.0 mmol/L, （F） 20.0 mmol/L, （G） 50.0 mmol/L, （H） 100.0 mmol/L, （I） 200.0 mmol/L"

Fig. 9

Appearance （a） and EI （b） of Pickering emulsions stabilized by different sodium chloride concentrations, 24 h after preparation"