Surface Coverage and Competitive Adsorption on Carbon Nanotubes

Fernandes, Ricardo M.F.; Buzaglo, Matat; Regev, Oren; Marques, Eduardo F.; Furó, István

doi:10.1021/acs.jpcc.5b06685

Cited by 20 publications

(34 citation statements)

References 49 publications

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“…There is also no order to the surface area coverage of BSA on the nanotubes . BSA with NaCl is assumed to increase the ionic strength, but reduce the electrostatic interaction, between adjacent BSA molecules due to the screening effect of Na + and Cl − ions acting as counter and coions.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Colloidal Stability and Electrical Conductivity of Single-Walled Carbon Nanotubes Dispersed in Water

Devre

Budhlall

Barry

2015

Macromol. Chem. Phys.

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In this article, the results of a focused systematic investigation of the nature, type, and concentration of cationic and anionic surfactants and proteins required to simultaneously disperse single‐walled carbon nanotubes (SWNTs) and enhance their electrical conductivities in water are presented. The dispersibility of SWNTs suspended in aqueous solutions is evaluated via light scattering to characterize the average particle size, particle size dispersion, electrophoretic mobility, and ζ‐potential of the dispersions. It is found that the colloidal stability of SWNT dispersions is influenced by the surfactant charge and concentration – i.e., above or below its critical micelle concentration and for proteins its charge. The amphiphilicity, concentration, and charge of the surfactant or protein determine their surface coverage on the SWNT and simultaneously increase electrostatic and steric repulsion and decrease surface chemical heterogeneity. It is found that the electrical conductivities of SWNT films stabilized with surfactant are as high as that without surfactants, with the added advantage of being homogeneously dispersed in water with significant enhancement in the long‐term stability of the nanotubes in water. These findings suggest that enhancement of the electrical properties of SWNTs requires selection of a surfactant that has strong adsorption, and thus strong interactions with the nanotube – i.e., π–π stacking – and using concentrations above the CMC. Overall, these results demonstrate the importance of understanding the structure/property relationships between SWNTs and their dispersants in order to achieve high colloidal stability and electrical conductivities.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Colloidal Stability and Electrical Conductivity of Single-Walled Carbon Nanotubes Dispersed in Water

Devre

Budhlall

Barry

2015

Macromol. Chem. Phys.

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“…In this work, we report the assembly of nanocomposites combining MWNTs and two TMDs, WS 2 and MoS 2 , and the performance of the obtained WS 2 @MWNT and MoS 2 @MWNT materials as ORR and OER electrocatalysts. The individual building blocks were prepared using surfactants as dispersants and a strictly controlled dispersal procedure in aqueous media [ 44 , 45 , 46 , 47 ]. A schematic representation of the process, and its underlying rationale, is shown in Figure 1 A–C.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites Prepared from Carbon Nanotubes and the Transition Metal Dichalcogenides WS2 and MoS2 via Surfactant-Assisted Dispersions as Electrocatalysts for Oxygen Reactions

et al. 2021

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Fuel cells are emerging devices as clean and renewable energy sources, provided their efficiency is increased. In this work, we prepared nanocomposites based on multiwalled carbon nanotubes (MWNTs) and transition metal dichalcogenides (TMDs), namely WS2 and MoS2, and evaluated their performance as electrocatalysts for the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR), relevant to fuel cells. The one- and two-dimensional (1D and 2D) building blocks were initially exfoliated and non-covalently functionalized by surfactants of opposite charge in aqueous media (tetradecyltrimethylammonium bromide, TTAB, for the nanotubes and sodium cholate, SC, for the dichalcogenides), and thereafter, the three-dimensional (3D) MoS2@MWNT and WS2@MWNT composites were assembled via surfactant-mediated electrostatic interactions. The nanocomposites were characterized by scanning electron microscopy (SEM) and structural differences were found. WS2@MWNT and MoS2@MWNT show moderate ORR performance with potential onsets of 0.71 and 0.73 V vs. RHE respectively, and diffusion-limiting current densities of −1.87 and −2.74 mA·cm−2, respectively. Both materials present, however, better tolerance to methanol crossover when compared to Pt/C and good stability. Regarding OER performance, MoS2@MWNT exhibits promising results, with η10 and jmax of 0.55 V and 17.96 mA·cm−2, respectively. The fabrication method presented here is cost-effective, robust and versatile, opening the doors for the optimization of electrocatalysts’ performance.

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“…Consequently, the above variations would significantly diminish their optical and electrical properties 27 . On the other hand, non-covalent immobilization of proteins on an SWCNT or Gra may not change their physical properties, thus it could be considered as an alternative 28 . Therefore, recently there have been efforts to uncover changes occurring in protein structures after non-covalent attachment of proteins with different types of nanostructures 29 .…”

Section: Introductionmentioning

confidence: 99%

An investigation into non-covalent functionalization of a single-walled carbon nanotube and a graphene sheet with protein G:A combined experimental and molecular dynamics study

Ebrahim-Habibi

Ghobeh

Mahyari

et al. 2019

Sci Rep

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Investigation of non-covalent interaction of hydrophobic surfaces with the protein G (PrG) is necessary due to their frequent utilization in immunosensors and ELISA. It has been confirmed that surfaces, including carbonous-nanostructures (CNS) could orient proteins for a better activation. Herein, PrG interaction with single-walled carbon nanotube (SWCNT) and graphene (Gra) nanostructures was studied by employing experimental and MD simulation techniques. It is confirmed that the PrG could adequately interact with both SWCNT and Gra and therefore fine dispersion for them was achieved in the media. Results indicated that even though SWCNT was loaded with more content of PrG in comparison with the Gra, the adsorption of the PrG on Gra did not induce significant changes in the IgG tendency. Several orientations of the PrG were adopted in the presence of SWCNT or Gra; however, SWCNT could block the PrG-FcR. Moreover, it was confirmed that SWCNT reduced the α-helical structure content in the PrG. Reduction of α-helical structure of the PrG and improper orientation of the PrG-SWCNT could remarkably decrease the PrG tendency to the Fc of the IgG. Importantly, the Gra could appropriately orient the PrG by both exposing the PrG-FcR and also by blocking the fragment of the PrG that had tendency to interact with Fab in IgG.

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Surface Coverage and Competitive Adsorption on Carbon Nanotubes

Cited by 20 publications

References 49 publications

Enhancing the Colloidal Stability and Electrical Conductivity of Single-Walled Carbon Nanotubes Dispersed in Water

Enhancing the Colloidal Stability and Electrical Conductivity of Single-Walled Carbon Nanotubes Dispersed in Water

Nanocomposites Prepared from Carbon Nanotubes and the Transition Metal Dichalcogenides WS2 and MoS2 via Surfactant-Assisted Dispersions as Electrocatalysts for Oxygen Reactions

An investigation into non-covalent functionalization of a single-walled carbon nanotube and a graphene sheet with protein G:A combined experimental and molecular dynamics study

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