Formation and Growth of Mesoglobules in Aqueous Poly(N-isopropylacrylamide) Solutions Revealed with Kinetic Small-Angle Neutron Scattering and Fast Pressure Jumps

Bart Jan Niebuur; Leonardo Chiappisi; Xiaohan Zhang; Florian Jung; Alfons Schulte; Christine M. Papadakis

doi:10.1021/acsmacrolett.8b00605

Formation and Growth of Mesoglobules in Aqueous Poly(N-isopropylacrylamide) Solutions Revealed with Kinetic Small-Angle Neutron Scattering and Fast Pressure Jumps

Bart Jan Niebuur, Leonardo Chiappisi, Xiaohan Zhang, Florian Jung, Alfons Schulte, Christine M. Papadakis

Associate Professorship of Experimentalphysik - Weiche Materie

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The phase transition from swollen chains to polymer mesoglobules of an aqueous solution of poly(N-isopropylacrylamide) is investigated with kinetic small-angle neutron scattering with 50 ms time resolution in conjunction with millisecond pressure jumps across the coexistence line. The time-resolved study evidenced three distinct regimes: fractal clusters form during the first second and transform into compact mesoglobules. During the following ∼20 s, these grow by diffusion-limited coalescence. The final step consists of a slow growth characterized by an energy barrier of several k_BT. The method opens opportunities for kinetic structural studies of multicomponent systems over wide length and time scales and gives a structural picture spanning from the chain collapse to mesoscopic phase separation.

Original language	English
Pages (from-to)	1155-1160
Number of pages	6
Journal	ACS Macro Letters
Volume	7
Issue number	10
DOIs	https://doi.org/10.1021/acsmacrolett.8b00605
State	Published - 16 Oct 2018

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title = "Formation and Growth of Mesoglobules in Aqueous Poly(N-isopropylacrylamide) Solutions Revealed with Kinetic Small-Angle Neutron Scattering and Fast Pressure Jumps",

abstract = "The phase transition from swollen chains to polymer mesoglobules of an aqueous solution of poly(N-isopropylacrylamide) is investigated with kinetic small-angle neutron scattering with 50 ms time resolution in conjunction with millisecond pressure jumps across the coexistence line. The time-resolved study evidenced three distinct regimes: fractal clusters form during the first second and transform into compact mesoglobules. During the following ∼20 s, these grow by diffusion-limited coalescence. The final step consists of a slow growth characterized by an energy barrier of several kBT. The method opens opportunities for kinetic structural studies of multicomponent systems over wide length and time scales and gives a structural picture spanning from the chain collapse to mesoscopic phase separation.",

author = "Niebuur, {Bart Jan} and Leonardo Chiappisi and Xiaohan Zhang and Florian Jung and Alfons Schulte and Papadakis, {Christine M.}",

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T1 - Formation and Growth of Mesoglobules in Aqueous Poly(N-isopropylacrylamide) Solutions Revealed with Kinetic Small-Angle Neutron Scattering and Fast Pressure Jumps

AU - Niebuur, Bart Jan

AU - Chiappisi, Leonardo

AU - Zhang, Xiaohan

AU - Jung, Florian

AU - Schulte, Alfons

AU - Papadakis, Christine M.

PY - 2018/10/16

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AB - The phase transition from swollen chains to polymer mesoglobules of an aqueous solution of poly(N-isopropylacrylamide) is investigated with kinetic small-angle neutron scattering with 50 ms time resolution in conjunction with millisecond pressure jumps across the coexistence line. The time-resolved study evidenced three distinct regimes: fractal clusters form during the first second and transform into compact mesoglobules. During the following ∼20 s, these grow by diffusion-limited coalescence. The final step consists of a slow growth characterized by an energy barrier of several kBT. The method opens opportunities for kinetic structural studies of multicomponent systems over wide length and time scales and gives a structural picture spanning from the chain collapse to mesoscopic phase separation.

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Formation and Growth of Mesoglobules in Aqueous Poly(N-isopropylacrylamide) Solutions Revealed with Kinetic Small-Angle Neutron Scattering and Fast Pressure Jumps

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