2016
DOI: 10.1039/c5sm03062e
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Isostructural solid–solid phase transition in monolayers of soft core–shell particles at fluid interfaces: structure and mechanics

Abstract: We have studied the complete two-dimensional phase diagram of a core-shell microgel-laden fluid interface by synchronizing its compression with the deposition of the interfacial monolayer. Applying a new protocol, different positions on the substrate correspond to different values of the monolayer surface pressure and specific area. Analyzing the microstructure of the deposited monolayers, we discovered an isostructural solid-solid phase transition between two crystalline phases with the same hexagonal symmetr… Show more

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Cited by 118 publications
(266 citation statements)
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“…14,15,39 At low surface pressures, such microgels assemble into a hexagonal non-close-packed lattice, where they are in corona-corona contact. 17 As corroborated by a recent neutron reflectivity study, PNiPAm microgels adsorbed at the air/water interface can be divided into three structural regimes 40 : (i) The corona, consisting of a nanometer thin film of highly stretched PNiPAm chains with a low water content; (ii) the more crosslinked, fully solvated microgel core;…”
Section: Discussionmentioning
confidence: 84%
“…14,15,39 At low surface pressures, such microgels assemble into a hexagonal non-close-packed lattice, where they are in corona-corona contact. 17 As corroborated by a recent neutron reflectivity study, PNiPAm microgels adsorbed at the air/water interface can be divided into three structural regimes 40 : (i) The corona, consisting of a nanometer thin film of highly stretched PNiPAm chains with a low water content; (ii) the more crosslinked, fully solvated microgel core;…”
Section: Discussionmentioning
confidence: 84%
“…This makes the interpretation of such experiments much less straightforward than often assumed 7, 9 . Given the increasing use of thermoresponsive microgels as model systems to study a broad range of phenomena as diverse as structural transitions in 2 and 3 dimensions 24, 25 , or colloidal filtration 26 , we also expect that the ability of microgels to respond to dense packing through interpenetration and/or deswelling will have important consequences for the interpretation of these investigations.…”
Section: Resultsmentioning
confidence: 99%
“…S1. The compression of the small microgels is thoroughly described in previous works 6,7 . For the realization of binary systems, first we tried to pre-mix big and small microgels in water in a ratio of 1:6 of big to small microgels, but due to their opposite charge in MilliQ water conditions ( Fig.…”
Section: Optical Measurementsmentioning
confidence: 99%