In: Nature Communications, 2020, vol. 11, no. 1, p. 4315
Due to their controlled size, sensitivity to external stimuli, and ease-of-use, microgel colloids are unique building blocks for soft materials made by crosslinking polymers on the micrometer scale. Despite the plethora of work published, many questions about their internal structure, interactions, and phase behavior are still open. The reasons for this lack of understanding are the...
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In: Physical Review E, 2019, vol. 100, no. 3, p. 032602
We introduce a theoretical approach to describe structural correlations among charged permeable spheres at finite particle concentrations. This theory explicitly accounts for correlations among microions and between microions and macroions and allows for the proposal of an effective interaction among macroions that successfully captures structural correlations observed in poly- N -isopropyl...
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In: Nature Communications, 2019, vol. 10, no. 1, p. 2436
Thermosensitive microgels are widely studied hybrid systems combining properties of polymers and colloidal particles in a unique way. Due to their complex morphology, their interactions and packing, and consequentially the viscoelasticity of suspensions made from microgels, are still not fully understood, in particular under dense packing conditions. Here we study the frequency-dependent...
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In: Proceedings of the National Academy of Sciences, 2019, vol. 116, no. 16, p. 7766–7771
Motivated by improvements in diffusing wave spectroscopy (DWS) for nonergodic, highly optically scattering soft matter and by cursory treatment of collective scattering effects in prior DWS microrheology experiments, we investigate the low-frequency plateau elastic shear moduli G′p of concentrated, monodisperse, disordered oil-in- water emulsions as droplets jam. In such experiments, the...
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In: Nanoscale, 2018, vol. 10, no. 47, p. 22189–22195
The realization of non-close-packed nanoscale patterns with multiple feature sizes and length scales via colloidal self-assembly is a highly challenging task. We demonstrate here the creation of a variety of tunable particle arrays by harnessing the sequential self-assembly and deposition of two differently sized microgel particles at the fluid–fluid interface. The two-step process is...
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In: Physical Review E, 2018, vol. 97, no. 4, p. 040601
We explore the glassy dynamics of soft colloids using microgels and charged particles interacting by steric and screened Coulomb interactions, respectively. In the supercooled regime, the structural relaxation time τα of both systems grows steeply with volume fraction, reminiscent of the behavior of colloidal hard spheres. Computer simulations confirm that the growth of τα on approaching...
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In: Experimental Mechanics, 2011, vol. 51, no. 8, p. 1421-1433
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In: Rock Mechanics and Rock Engineering, 2012, vol. 45, no. 5, p. 695-709
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In: Rock Mechanics and Rock Engineering, 2011, vol. 44, no. 1, p. 37-61
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In: Rock Mechanics and Rock Engineering, 2011, vol. 44, no. 1, p. 63-83
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