Selective Intercalation of Polymers in Carbon Nanotubes

Selective Intercalation of Polymers in Carbon Nanotubes

A room-temperature, open-air method is devised to selectively intercalate relatively low-molecular-weight polymers (∼10−100 kDa) from dilute, volatile solutions into open-end, as-grown, wettable carbon nanotubes with 50−100 nm diameters. The method relies on a novel self-sustained diffusion mechanis...

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Veröffentlicht in:Langmuir 2007-07, Vol.23 (14), p.7451-7455
Hauptverfasser: Bazilevsky, Alexander V, Sun, Kexia, Yarin, Alexander L, Megaridis, Constantine M
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Sprache:eng
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Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
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container_issue 14
container_start_page 7451
container_title Langmuir
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creator Bazilevsky, Alexander V
Sun, Kexia
Yarin, Alexander L
Megaridis, Constantine M
description A room-temperature, open-air method is devised to selectively intercalate relatively low-molecular-weight polymers (∼10−100 kDa) from dilute, volatile solutions into open-end, as-grown, wettable carbon nanotubes with 50−100 nm diameters. The method relies on a novel self-sustained diffusion mechanism driving polymers from dilute volatile solutions into carbon nanotubes and concentrating them there. Relatively low-molecular-weight polymers, such as poly(ethylene oxide) (PEO, 600 kDa) and poly(caprolactone) (PCL, 80 kDa), were encapsulated in graphitic nanotubes as confirmed by transmission electron microscopy, which revealed morphologies characteristic of mixtures in nanoconfinements affected by intermolecular forces. Whereas relatively small, flexible polymer molecules can conform to enter these nanotubes, larger macromolecules (∼1000 kDa) remain outside. The selective nature of this process is useful for filling nanotubes with polymers and could also be valuable in capping nanotubes.
doi_str_mv 10.1021/la070140n
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subjects Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Surface physical chemistry
title Selective Intercalation of Polymers in Carbon Nanotubes
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