Ipaint solutions llc4/6/2023 ![]() The primary challenge for a precise estimation of the contact angle is the accurate localization of the adsorbed colloids and of the interface. ![]() 15–17Īlthough particle-laden interfaces have been the subject of systematic investigations for more than a century, 13,14 only recently new methods have emerged as alternative to ensemble measurements to interrogate wetting properties at the single-particle level. 13,14 This enhances their mechanical properties and offers adequate protection against coalescence. It is the kinetic trapping of colloidal particles of various shape, 1–3 roughness, 4–6 softness, 7–11 and surface chemistry 12 at fluid interfaces, which grants long-term stability to particle-stabilized emulsions. One way to halt the macroscopic phase separation of two immiscible liquids makes use of the adsorption of micro- and nanoparticles at the fluid interface. Introduction Materials comprising homogeneous mixtures of immiscible fluids are of paramount importance for a broad range of natural and technological processes, but they all suffer from an unavoidable, thermodynamically driven propensity to phase-separate. Next, we image elliptical particles at a water–decane interface, showing that the corresponding interfacial deformations can be clearly captured by iPAINT microscopy. ![]() These experiments reveal a non-negligible dependence of θ on particle size, from which we infer an effective line tension, τ. First, we determine single particle contact angles for both hydrophobic and hydrophilic spherical colloids. ![]() Herewith, we resolve with nanometer accuracy both the position of individual nanoparticles at a water–octanol interface and the location of the interface itself. To tackle this challenge, we utilize a newly developed super-resolution microscopy method, called iPAINT, which exploits non-covalent and continuous labelling of interfaces with photo-activatable fluorescent probes. However, none of these techniques enables the simultaneous visualization of the nanoparticles and the reconstruction of the fluid interface to which they are adsorbed, in situ. Several methods have recently been developed to measure the contact angle of individual particles adsorbed at liquid–liquid interfaces, as morphological and chemical heterogeneities at the particle surface can significantly affect θ. ![]() The key parameter which determines the kinetic and thermodynamic properties of these colloids is the particle contact angle, θ. Solid particles adsorbed at fluid interfaces are crucial for the mechanical stability of Pickering emulsions. E-mail: b Laboratory of Self-Organizing Soft Matter, Department of Chemistry and Chemical Engineering, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands c Laboratory of Macromolecular and Organic Chemistry, Department of Chemistry and Chemical Engineering, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands d Laboratory for Interfaces, Soft Matter and Assembly, Department of Materials, ETH Zurich, Vladimir-Prelog Zürich, Switzerland e Laboratory of Molecular Biosensing, Department of Applied Physics, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands f Laboratory of Physical Chemistry, Department of Chemistry and Chemical Engineering, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands * abcf a Institute for Complex Molecular Systems, Eindhoven University of Technology, Post Office Box 513, 5600 MB Eindhoven, The Netherlands. Nanoscale, 2019, 11, 6654-6661 Super-resolution microscopy on single particles at fluid interfaces reveals their wetting properties and interfacial deformations † ![]()
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