Hierarchical supramolecular structuring and dynamical properties of water soluble polyethylene glycol–perylene self-assemblies

文献情報

出版日 2012-02-29

DOI 10.1039/C2CP23786E

インパクトファクター 3.676

著者

Nicolas Jouault, Yunjie Xiang, Emilie Moulin, Gad Fuks, Nicolas Giuseppone, Eric Buhler

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要旨

The structural and dynamical properties of dilute aqueous solutions of poly(ethylene glycol)–perylene diimides (PEGn–PDI) have been investigated by means of static and dynamic light scattering, TEM microscopy, and small-angle X-ray scattering experiments. The amphiphilic PEGn–PDI molecules first self-assemble into stable and compact primary stacks of a few units of planar PDI through hydrophobic and π–π interactions. These primary stacks subsequently arrange in large and globular aggregates of typically 100–250 nm via weak PEG chain interpenetration. Surprisingly, the scattered electric field autocorrelation function g(1)(q,t) measured by dynamic light scattering evolves over very long periods of times (several months) and up to a bimodal distribution. The fast relaxation mechanism is associated to the diffusion of free primary stacks, whereas the slower relaxation still indicates the presence of large self-assemblies. Kinetic experiments show that the large supramolecular aggregates slowly release the free primary stacks whose proportion increases with time. This dissociation depends on several parameters such as PEG side chain length, total concentration, and shaking.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Hierarchical supramolecular structuring and dynamical properties of water soluble polyethylene glycol–perylene self-assemblies

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