Coassembly of Nanorods and Nanospheres in Suspensions and in Stratified Films
The entropically driven coassembly of nanorods (cellulose nanocrystals, CNCs) and nanospheres (dye‐labeled spherical latex nanoparticles, NPs) was studied in aqueous suspensions and in solid films. In mixed CNC‐latex suspensions, phase separation into an isotropic latex‐NP‐rich and a chiral nematic...
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Veröffentlicht in: | Angewandte Chemie 2015-05, Vol.127 (19), p.5710-5714 |
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Format: | Artikel |
Sprache: | eng ; ger |
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Zusammenfassung: | The entropically driven coassembly of nanorods (cellulose nanocrystals, CNCs) and nanospheres (dye‐labeled spherical latex nanoparticles, NPs) was studied in aqueous suspensions and in solid films. In mixed CNC‐latex suspensions, phase separation into an isotropic latex‐NP‐rich and a chiral nematic CNC‐rich phase took place; the latter contained a significant amount of latex NPs. Drying the mixed suspension resulted in CNC‐latex films with planar disordered layers of latex NPs, which alternated with chiral nematic CNC‐rich regions. In addition, fluorescent latex NPs were embedded in the chiral nematic domains. The stratified morphology of the films, together with a random distribution of latex NPs in the anisotropic phase, led to the films having close‐to‐uniform fluorescence, birefringence, and circular dichroism properties.
Entropisch gesteuert bilden stabförmige Cellulose‐Nanokristalle und kugelförmige Latex‐Nanopartikel Suspensionen mit chiral‐nematischer Ordnung. Trocknen dieser Suspensionen liefert Filme (siehe SEM‐Bild), in denen die langreichweitige nematische Ordnung erhalten bleibt. Die Filme haben eine Schichtenmorphologie mit fast einheitlichen Fluoreszenz‐, Doppelbrechungs‐ und Zirkulardichroismus‐Eigenschaften. |
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ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.201500277 |