Effect of pH on the stability of W1/O/W2 double emulsion stabilized by combination of biosilica and Tween-20Lanny Sapei, Tokok Adiarto, Roi Handomo and Sonny Hutomo ChandraMATEC Web Conf., 215 (2018) 01028DOI: https://doi.org/10.1051/matecconf/201821501028