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100 1 _ |a Scotti, A.
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245 _ _ |a Exploring the colloid-to-polymer transition for ultra-low crosslinked microgels from three to two dimensions
260 _ _ |a [London]
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520 _ _ |a Microgels are solvent-swollen nano- and microparticles that show prevalent colloidal-like behavior despite their polymeric nature. Here we study ultra-low crosslinked poly(N-isopropylacrylamide) microgels (ULC), which can behave like colloids or flexible polymers depending on dimensionality, compression or other external stimuli. Small-angle neutron scattering shows that the structure of the ULC microgels in bulk aqueous solution is characterized by a density profile that decays smoothly from the center to a fuzzy surface. Their phase behavior and rheological properties are those of soft colloids. However, when these microgels are confined at an oil-water interface, their behavior resembles that of flexible macromolecules. Once monolayers of ultra-low crosslinked microgels are compressed, deposited on solid substrate and studied with atomic-force microscopy, a concentration-dependent topography is observed. Depending on the compression, these microgels can behave as flexible polymers, covering the substrate with a uniform film, or as colloidal microgels leading to a monolayer of particles.
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650 1 7 |a Polymers, Soft Nano Particles and Proteins
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693 _ _ |a Forschungs-Neutronenquelle Heinz Maier-Leibnitz
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700 1 _ |a Bochenek, S.
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700 1 _ |a Brugnoni, M.
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700 1 _ |a Fernandez-Rodriguez, M. A.
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700 1 _ |a Schulte, M. F.
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700 1 _ |a Houston, J. E.
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700 1 _ |a Potemkin, I. I.
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700 1 _ |a Isa, L.
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700 1 _ |a Richtering, W.
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773 _ _ |a 10.1038/s41467-019-09227-5
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