Research paperA new approach for determination of powder wettability
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2018, Advanced Powder TechnologyMathematical modeling of the capillary rise of liquids in partially soluble particle beds
2018, Powder TechnologyEffect of water activity and gaseous phase relative humidity on microcrystalline cellulose water contact angle measured by the Washburn technique
2016, Colloids and Surfaces A: Physicochemical and Engineering AspectsCitation Excerpt :For powders and clusters, the most common method used to determine the contact angle is the Washburn or capillary rise technique [6,9,10], which will be described in detail in the following section. The Washburn technique estimates a dynamic contact angle, calculated from the capillary rise of the liquid in a packed bed of particles in a tube [3,5]; this contact angle is generally different from the static contact angle obtained with flat substrates of the same chemical nature by the sessile drop method [11–15]. Additionally, the value of contact angle obtained by the Washburn technique may be influenced by the level of compaction of the bed of particles.
Investigation of surface porosity measurements and compaction pressure as means to ensure consistent contact angle determinations
2016, International Journal of PharmaceuticsTechniques for determining contact angle and wettability of powders
2016, Powder TechnologyCitation Excerpt :While this technique might be straightforward for flat smooth and non-porous surfaces, several issues such as surface roughness, swelling and liquid penetration into pores make it difficult to measure the contact angle of powders directly and as a result, several indirect methods that relate penetration rate or pressure to contact angles have been developed [15–20]. Nevertheless, sessile drop, Wilhelmy plate and liquid penetration (both column and thin film wicking) are still the most commonly reported methods for determining the wettability of powders [1,2,18,21–40] (Table 1). Table 1 also lists other methods utilized to evaluate wettability of powders, mainly measuring the contact angle of a liquid formed on the powder.