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Soft particles display highly versatile properties with respect to hardcolloids, even more so at fluid-fluid interfaces. In particular, microgels,consisting of a cross-linked polymer network, are able to deform and flattenupon adsorption at the interface due to the balance between surface tension andinternal elasticity. Despite the existence of experimental results, a detailedtheoretical understanding of this phenomenon is still lacking due to theabsence of appropriate microscopic models. In this work, we propose an advancedmodelling of microgels at a flat water/oil interface. The model builds on arealistic description of the internal polymeric architecture andsingle-particle properties of the microgel and is able to reproduce itsexperimentally observed shape at the interface. Complementing moleculardynamics simulations with in-situ cryo-electron microscopy experiments andatomic force microscopy imaging after Langmuir-Blodgett deposition, we comparethe morphology of the microgels for different values of the cross-linkingratios. Our model allows for a systematic microscopic investigation of softparticles at fluid interfaces, which is essential to develop predictive powerfor the use of microgels in a broad range of applications, including thestabilization of smart emulsions and the versatile patterning of surfaces.

Microgels Adsorbed at Liquid-Liquid Interfaces: A Joint Numerical and Experimental Study