Add time:08/02/2019         Source:sciencedirect.com

In this study, the interfacial tension behavior of Halloysite (cas 12068-50-7) nanotube (HNT) as a hydrophilic nanoparticle and modified APTES-HNT as a hydrophobic nanoparticle at the palm oil-water interface was investigated. The result of this study was used to determine the stability and potential formation of Pickering emulsion as a novel dispersed system. The diffusion coefficients at the initial and late stages of adsorption were obtained. The results indicated that the interfacial tension of palm oil-water decreased with increasing the nanoparticles concentration. The diffusion coefficient at the different concentrations (0.1 g/L to 0.5 g/L) for the short time was obtained to be within the range of 1.4480 ×10-14- 6.1408 ×10-13 (m2/s) and for the longer times was within the range of 4.8065 ×10-16-7.4476×10-15 m2/s. The results indicated that the HNT and APTES-HNT produced significant surface and interfacial tension reductions, which confirmed their ability for stabilization of Pickering emulsion. The measured contact angle for HNT and APTES-HNT were determined to be 29.14 ° and 97 °, respectively. Stable oil-in-water and water-in-oil emulsion were obtained for HNT and APTES-HNT, respectively. The emulsions exhibited no coalescence over a period of 4 weeks.

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