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Size-Controlled Self-assembly of Superparamagnetic Polymersomes

Identifieur interne : 001288 ( Main/Exploration ); précédent : 001287; suivant : 001289

Size-Controlled Self-assembly of Superparamagnetic Polymersomes

Auteurs : Robert J. Hickey [États-Unis] ; Jason Koski [États-Unis] ; Xin Meng [États-Unis] ; Robert A. Riggleman [États-Unis] ; Peijun Zhang [États-Unis] ; So-Jung Park [États-Unis, Corée du Sud]

Source :

ACS nano [ 1936-0851 ] ; 2014.

RBID : PMC:5540317

Abstract

We report the size-controlled self-assembly of polymersomes through the cooperative self-assembly of nanoparticles and amphiphilic polymers. Polymersomes densely packed with magnetic nanoparticles in the polymersome membrane (magneto-polymersome) were fabricated with a series of different sized iron oxide nanoparticles. The distribution of nanoparticles in a polymersome membrane was size-dependent; while small nanoparticles were dispersed in a polymer bilayer, large particles formed well-ordered superstructure at the interface between the inner and outer layer of a bilayer membrane. The yield of magneto-polymersomes increased with increasing the diameter of incorporated nanoparticles. Moreover, the size of polymersomes was effectively controlled by varying the size of incorporated nanoparticles. This size-dependent self-assembly was attributed to the polymer chain entropy effect and the size-dependent localization of nanoparticles in polymersome bilayers. The transverse relaxation rates (r₂) of magneto-polymersomes increased with increasing the nanoparticle diameter and decreasing the size of polymersomes, reaching 555 ± 24 s⁻¹mM⁻¹ for 241 ± 16 nm polymersomes, which is the highest value reported to date for superparamagnetic iron oxide nanoparticles.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5540317

DOI: 10.1021/nn405012h
PubMed: 24369711
PubMed Central: 5540317

Affiliations:

Le document en format XML

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 Street, Philadelphia, PA 19104</nlm:aff>
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 Street, Philadelphia, PA 19104</nlm:aff>
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 Street, Philadelphia, PA 19104</nlm:aff>
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 Street, Philadelphia, PA 19104</nlm:aff>
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<front><div type="abstract" xml:lang="en"><p id="P1">We report the size-controlled self-assembly of polymersomes through the cooperative self-assembly of nanoparticles and amphiphilic polymers. Polymersomes densely packed with magnetic nanoparticles in the polymersome membrane (magneto-polymersome) were fabricated with a series of different sized iron oxide nanoparticles. The distribution of nanoparticles in a polymersome membrane was size-dependent; while small nanoparticles were dispersed in a polymer bilayer, large particles formed well-ordered superstructure at the interface between the inner and outer layer of a bilayer membrane. The yield of magneto-polymersomes increased with increasing the diameter of incorporated nanoparticles. Moreover, the size of polymersomes was effectively controlled by varying the size of incorporated nanoparticles. This size-dependent self-assembly was attributed to the polymer chain entropy effect and the size-dependent localization of nanoparticles in polymersome bilayers. The transverse relaxation rates (<italic>r</italic>
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Size-Controlled Self-assembly of Superparamagnetic Polymersomes

Size-Controlled Self-assembly of Superparamagnetic Polymersomes

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