2023
DOI: 10.1021/acs.langmuir.2c02796
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Growth of Smart Microgels in a Flow Reactor Scrutinized by In-Line SAXS

Abstract: In this work, a continuous flow setup for in situ investigation of microgel growth with small-angle X-ray scattering (SAXS) is established. Poly(N-n-propyl­acrylamide) (PNNPAM) and poly(N-isopropyl­acrylamide) (PNIPAM) microgels are synthesized in H2O at different residence times inside a continuous flow reactor. The microgels are investigated by in situ SAXS and ex situ photon correlation spectroscopy. The size of the microgels was found to be reproducible in independent experiments with run times of up to 7 … Show more

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“…In particular, the hydrodynamic radius, R H , of cross-linked PNIPAM microgels and their swelling behavior have been routinely investigated by dynamic light scattering (DLS) experiments. Furthermore, small-angle X-ray (SAXS) , and neutron scattering (SANS) , were systematically employed to resolve the characteristic lengths and the polymer radial profiles of PNIPAM-based particles . Such analysis mostly relies on model fitting of the microgel form factor measured under dilute conditions using the fuzzy sphere model introduced by Stieger et al However, given the increasing complexity of recently synthesized microgels and hybrid particles, more sophisticated models have been developed in recent years. SANS experiments are also used to investigate the single microgel conformation in concentrated suspensions using contrast variation. Hereby, either the so-called tracer ,,, or the zero average contrast (ZAC) , methods are applied.…”
Section: Introductionmentioning
confidence: 99%
“…In particular, the hydrodynamic radius, R H , of cross-linked PNIPAM microgels and their swelling behavior have been routinely investigated by dynamic light scattering (DLS) experiments. Furthermore, small-angle X-ray (SAXS) , and neutron scattering (SANS) , were systematically employed to resolve the characteristic lengths and the polymer radial profiles of PNIPAM-based particles . Such analysis mostly relies on model fitting of the microgel form factor measured under dilute conditions using the fuzzy sphere model introduced by Stieger et al However, given the increasing complexity of recently synthesized microgels and hybrid particles, more sophisticated models have been developed in recent years. SANS experiments are also used to investigate the single microgel conformation in concentrated suspensions using contrast variation. Hereby, either the so-called tracer ,,, or the zero average contrast (ZAC) , methods are applied.…”
Section: Introductionmentioning
confidence: 99%