Scaling of binding affinities and cooperativities of surfactants on carbon nanotubes

Minsuk Park, Junmo Park, Jiyun Lee, Sang Yong Ju

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

High-end applications of single-walled carbon nanotube (SWNT) require detailed understanding of their binding affinity (Kd) with surfactants. Here, we quantitatively determined the comprehensive Kd and aggregation number (γ) of nine nonionic and anionic surfactants according to SWNT chirality. Photoluminescence (PL)-based titration using flavin mononucleotide (FMN)-SWNT complexes showing the largest redshifted optical transition enabled quantitative comparison of the surfactants and displayed distinct first and second regimes which correspond to partial and full replacements of FMN, respectively. Especially, the second transition exhibited sigmoidal PL change whose middle point denoted by the inverse of Kd slightly differs from critical micelle concentration of surfactant alone, depending on its functional groups. Moreover, nonionic surfactants displayed larger Kd and lower γ values than the anionic did. Specifically, Kd values between Pluronic F108 and sodium dodecyl sulfonate differ by four orders of magnitude. Such differences were rationalized in terms of the occupied volume of the micelle based on the hydrodynamic volume and γ. During the replacement, Kd and γ were affected by the degree of surfactant rearrangement induced by aging process, leading to more stable complex. Scaling the interactions between surfactant and SWNT provides useful guidelines to design novel SWNT sorting method using more than two surfactants.

Original languageEnglish
Pages (from-to)427-436
Number of pages10
JournalCarbon
Volume139
DOIs
Publication statusPublished - 2018 Nov 1

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Carbon Nanotubes
Surface-Active Agents
Single-walled carbon nanotubes (SWCN)
Carbon nanotubes
Surface active agents
Flavin Mononucleotide
Nonionic surfactants
Photoluminescence
Poloxamer
Optical transitions
Anionic surfactants
Critical micelle concentration
Chirality
Micelles
Titration
Sorting
Functional groups
Agglomeration
Hydrodynamics
Aging of materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

Park, Minsuk ; Park, Junmo ; Lee, Jiyun ; Ju, Sang Yong. / Scaling of binding affinities and cooperativities of surfactants on carbon nanotubes. In: Carbon. 2018 ; Vol. 139. pp. 427-436.
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Scaling of binding affinities and cooperativities of surfactants on carbon nanotubes. / Park, Minsuk; Park, Junmo; Lee, Jiyun; Ju, Sang Yong.

In: Carbon, Vol. 139, 01.11.2018, p. 427-436.

Research output: Contribution to journalArticle

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