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Pickering emulsions with 1% silica-NH2 at different oil/water ratios. (a) 5:95. (b) 10:90. (c) 20:80. (d) 30:70. Scale bar is 50 μm. (e) Droplet diameter as a function of silica-NH2 contents (wt %) and oil percentages in the emulsion (vol %).
