DOI > 10.5291/ILL-DATA.9-11-1855

This proposal is publicly available since 04/23/2023

Title

Hollow microgel in highly packed samples: SANS with contrast variation study.

Abstract

Hollow microgels are particles where a silica core, surrounded by a polymeric crosslinked shell, is dissolved leading to soft particles with a cavity at their center. We have verified that, in diluted suspensions, the cavity is present both in the swollen and deswollen state. No information about this system in concentrated suspensions are available. We have performed rheological measurements covering a wide range of concentration, from loosely packed up to highly overpacked suspensions. For the same sample we have investigated their phase behavior at different concentrations. We propose to study the deformation of these particles in response to an increase of the sample concentration. To do this we have made samples at different concentrations where few protonated hollow microgel are dispersed in a matrix of deuterated particles that are matched with the solvent. In this way SANS allows to study the form factor of hollow particles in concentrated suspensions. This is the only scattering technique able to do this. We will fit the data with our model for hollow fuzzy spheres. We will use this information to rationalize both the phase behavior and the flow priorities of this system.

Experimental Report

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Data Citation

The recommended format for citing this dataset in a research publication is in the following format:

Andrea Scotti; BRUGNONI Monia; RICHTERING Walter and SCHWEINS Ralf. (2018). Hollow microgel in highly packed samples: SANS with contrast variation study.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1855

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Metadata

Experiment Parameters

  • Environment temperature

    20C - 40C
  • Experiment moment

    110-3 - 310-1

Sample Parameters

  • Formula

    • suspensions of pNIPAM / D7-pNIPAM microgels in D2O/H2O