pickering乳液-颗粒在油水界面吸附.ppt

张春桥 2015-5 contents 1. Influnence of particle wettability on type and stability of Emulsion settling behavior settling behavior 2. Effect of particle Concentration particles initially location Rheology and particle structure 3. Effect of original Location Φw 4. Effect of electrolyte on emulsion Emulsion suspension VS. emulsion --C.F.C 5. Effect of pH Temperature on emulsion pH Temperature pH T pH引起的双重相反转 谢谢 请多多批评指正！ * Emulsion stabilized by particles Influnence of particle wettability on Emulsion Effect of particle Concentration Effect of original Location Φw Effect of electrolyte on emulsion Effect of pH Temperature on emulsion Binks, B. P. Langmuir, 2000, 16, 8622-8631 1 Immersion time at 22 °C of six silica powders in methanol-water mixtures of different composition 2 Binks, B. P. Langmuir, 2000, 16, 8622-8631 3 Binks, B. P. Langmuir, 2000, 16, 8622-8631 4 particles initial in toluene N. Yan et al. Colloids and Surfaces A: Physicochem. Eng. Aspects 193 (2001) 97–107 5 Settling of nanospheres-in toluene suspension (5 kg m-3 nanospheres） N. Yan et al. Colloids and Surfaces A: Physicochem. Eng. Aspects 193 (2001) 97–107 N. Yan et al. Colloids and Surfaces A: Physicochem. Eng. Aspects 193 (2001) 97–107 6 5 kg m-3 glass beads; diameter of glass beads: 2 μm 7 fume SiO2-water- cyclic silicone(D5) Binks, B. P. Silica-Stabilized Emulsions, Langmuir, Vol. 21, No. 8, 2005 (oil : water = 1:1 ) particle origianl in oil 36%（强疏水）和87%（强亲水）:润湿性决定乳液类型（1：1） 相反转：57%--1wt%；71%--2.5wt% ① C↑，d↓，sedimentation stability↑(d--coverage，η-network) ② Uniformity:0.22 → 0.95 （PK乳液特点：单分散性最好的是最大的乳液滴） 8 Binks, B. P. Langmuir, Vol. 21, No. 8, 2005 36% SiOH Binks, B. P. Langmuir, Vol. 21, No. 8, 2005 9 in oil VS. in water 71% SiOH 10 d越大，U越小(uniformity单分散性越好） 295μm--0.1wt% 60μm--1wt% 20μm--5wt% 71% SiOH in water O/W Binks, B. P. Langmuir, Vol. 21, No. 8, 2005 11 Binks, B. P. Silica-Stabilized Emulsions, Langmuir, Vol. 21, No. 8, 2005 shear rates 10 (○), 30 (□), and