Effect of Spatial Scale on the Value of the Surface Energy of a Solid

Roques-Carmes, Thibault; Alloul, Haytham; Hamieh, Tayssir; Toufaily, Joumana; Villièras, Frédéric

doi:10.1007/978-3-031-11996-5_3

Cited by 1 publication

(3 citation statements)

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“…Consequently, the critical surface energy of silica particles was equal to 38 mJ m −2 . This value was also rather consistent with hydrophobic silica particles described in the literature [ 24 , 31 ]. In parallel, similar experiments were conducted with water, paraffin and dodecane liquids.…”

Section: Resultssupporting

confidence: 92%

“…This value is relatively close to that obtained with dodecane. Based on the uncertainty of the measurement, mainly due to the possible roughness of the silica tablet [ 24 ], it is considered that the contact angle values are similar for dodecane/water/silica and paraffin/water/silica. This confirms the similar chemical nature of the two oils.…”

Section: Resultsmentioning

confidence: 99%

“…A tablet of silica particles was made through a compression process in a hydraulic press from Instron equipped with a 50 kN force sensor using a protocol developed in our laboratory [ 24 ]. The diameters of the matrix and of the punch were, respectively, 20 mm and 19 mm.…”

Section: Methodsmentioning

confidence: 99%

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Particles’ Organization in Direct Oil-in-Water and Reverse Water-in-Oil Pickering Emulsions

et al. 2023

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This paper addresses the impact of the particle initial wetting and the viscosity of the oil phase on the structure and rheological properties of direct (Oil/Water) and reverse (Water/Oil) Pickering emulsions. The emulsion structure was investigated via confocal microscopy and static light scattering. The flow and viscoelastic properties were probed by a stress-controlled rheometer. Partially hydrophobic silica particles have been employed at 1 and 4 wt.% to stabilize dodecane or paraffin-based emulsions at 20 vol.% of the dispersed phase. W/O emulsions were obtained when the particles were dispersed in the oily phase while O/W emulsions were prepared when the silica was introduced in the aqueous phase. We demonstrated that, although the particles adsorbed at the droplets interfaces for all the emulsions, their organization, the emulsion structure and their rheological properties depend in which phase they were previously dispersed in. We discuss these features as a function of the particle concentration and the oil viscosity.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%