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Contact angle and detachment energy of shape anisotropic particles at fluid-fluid interfaces.pdf
Journal of Colloid and Interface Science 478 (2016) 63–71
Contents lists available at ScienceDirect
Journal of Colloid and Interface Science
journal homepage: /locate/jcis
Regular Article
Contact angle and detachment energy of shape anisotropic particles at ?uid-?uid interfaces
Thriveni G. Anjali, Madivala G. Basavaraj ?
Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
highlights
The effect of size, shape and surface properties of particles on the contact angle is investigated.
The detachment energy calculation for cuboidal and spherocylindrical particles is carried out.
The surface energy of hematite particles is estimated using the contact angle values at two ?uid-?uid interfaces.
graphical abstract
article info
Article history: Received 4 May 2016 Accepted 28 May 2016 Available online 30 May 2016
Keywords: Anisotropic particles Contact angle Gel trapping technique Fluid-?uid interfaces Interfacial tension Surface energy Detachment/attachment energy
abstract
The three phase contact angle of particles, a measure of its wettability, is an important factor that greatly in?uences their behaviour at interfaces. It is one of the principal design parameters for potential applications of particles as emulsion/foam stabilizers, functional coatings and other novel materials. In the present work, the effect of size, shape and surface chemistry of particles on their contact angle is investigated using the gel trapping technique, which facilitates the direct visualization of the equilibrium position of particles at interfaces. The contact angle of hematite particles of spherocylindrical, peanut and cuboidal shapes, hematite-silica core-shell and silica shells is reported at a single particle level. The spherocylindrical and peanut shaped particles are always positioned with their major axis parallel to the interface. However, for cuboidal particles at air-water as
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