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- W2058741581 abstract "We have used the recently developed gel trapping technique (GTT) to determine the three-phase contact angles of submicrometer silica particles partially coated with octadecyl groups. The particles were spread at air−water and decane−water surfaces, and the aqueous phase was subsequently gelled with a nonadsorbing polysaccharide. The particles trapped at the surface of the aqueous gel were lifted by molding with curable poly(dimethylsiloxane) and imaged with scanning electron microscopy (SEM) to determine the particle contact line diameter which allows their contact angle at the original air−water or oil−water interface to be estimated. We report for the first time the use of the GTT for characterizing the contact angle of individual submicrometer particles adsorbed at liquid interfaces. The SEM images also reveal the structure of the particle monolayer at the interface and the structure of adsorbed particle aggregates. We have also determined the contact angles of agglomerated gold powder microparticles at the air−water and the decane−water interfaces. It was found that agglomerated gold particles demonstrate considerably higher contact angles than those on flat gold-coated surfaces." @default.
- W2058741581 created "2016-06-24" @default.
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- W2058741581 date "2004-09-22" @default.
- W2058741581 modified "2023-09-23" @default.
- W2058741581 title "Contact Angles of Colloid Silica and Gold Particles at Air−Water and Oil−Water Interfaces Determined with the Gel Trapping Technique" @default.
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- W2058741581 doi "https://doi.org/10.1021/la0489615" @default.
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