Aqueous dispersion of multiwall carbon nanotubes with phosphonic acid derivatives

Oueiny, C.; Berlioz, Sophie; Patout, L.; Perrin, F.X.

doi:10.1016/j.colsurfa.2016.01.028

Cited by 17 publications

(5 citation statements)

References 52 publications

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“…The zeta potential of ZnO was −11.48 mV in THF, and became more negative following modification, with the most negative being −89.12 mV for ZnO nanoparticles that were modified with F 21 DDPA ( Table 3 ). The perfluorinated phosphonic acid modifications were negatively charged, imparting a negative charge to the dispersed nanoparticles, as previously reported [ 53 , 54 ]. This negative charge led to electrostatic repulsion between molecules, stabilizing the nanoparticles.…”

Section: Resultssupporting

confidence: 56%

“…This negative charge led to electrostatic repulsion between molecules, stabilizing the nanoparticles. Consequently, the higher absolute value of the zeta potential means an increased stability of the suspended particles against agglomeration [ 54 , 55 ]. All of the perfluorinated phosphonic acid surface modifications that were included in this study led to a significant increase in surface stability when compared to the ZnO control.…”

Section: Resultsmentioning

confidence: 99%

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Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles

et al. 2017

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In this study, perfluorinated phosphonic acid modifications were utilized to modify zinc oxide (ZnO) nanoparticles because they create a more stable surface due to the electronegativity of the perfluoro head group. Specifically, 12-pentafluorophenoxydodecylphosphonic acid, 2,3,4,5,6-pentafluorobenzylphosphonic acid, and (1H,1H,2H,2H-perfluorododecyl)phosphonic acid have been used to form thin films on the nanoparticle surfaces. The modified nanoparticles were then characterized using infrared spectroscopy, X-ray photoelectron spectroscopy, and solid-state nuclear magnetic resonance spectroscopy. Dynamic light scattering and scanning electron microscopy-energy dispersive X-ray spectroscopy were utilized to determine the particle size of the nanoparticles before and after modification, and to analyze the film coverage on the ZnO surfaces, respectively. Zeta potential measurements were obtained to determine the stability of the ZnO nanoparticles. It was shown that the surface charge increased as the alkyl chain length increases. This study shows that modifying the ZnO nanoparticles with perfluorinated groups increases the stability of the phosphonic acids adsorbed on the surfaces. Thermogravimetric analysis was used to distinguish between chemically and physically bound films on the modified nanoparticles. The higher weight loss for 12-pentafluorophenoxydodecylphosphonic acid and (1H,1H,2H,2H-perfluorododecyl)phosphonic acid modifications corresponds to a higher surface concentration of the modifications, and, ideally, higher surface coverage. While previous studies have shown how phosphonic acids interact with the surfaces of ZnO, the aim of this study was to understand how the perfluorinated groups can tune the surface properties of the nanoparticles.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles

et al. 2017

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“…7, ODPA adsorbed on titania shied towards lower zeta potential values, in qualitative agreement with reported studies of ODPA adsorbed on different materials. 71,72 The shi of the zeta potential at basic pH was possibly due to unbonded P-OH groups, which will be investigated in more detail.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

New details of assembling bioactive films from dispersions of amphiphilic molecules on titania surfaces

et al. 2020

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“…Thus, one important aspect to facilitate further potential applications of CNTs lies in the proper surface modification to overcome the high van der Waals interactions between tubes, allowing their effective dispersion and proper processability [2,3]. There are different methodologies for CNT functionalization, which can be classified as covalent and non-covalent functionalization techniques [3][4][5][6][7][8]. An interesting approach for surface modification of CNTs involves the integration of the CNT with other functional components, which synergistically offers novel materials with potential applicability [4,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical functionalization of single wall carbon nanotubes with phosphorus and nitrogen species

Quintero-Jaime

Cazorla‐Amorós

Morallón

2020

Electrochimica Acta

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Single Wall Carbon Nanotubes (SWCNTs) have been successfully functionalized by electrochemical oxidation in presence of 4-aminophenyl phosphonic acid (4-APPA).Electrochemical modification has been performed by cyclic voltammetry using different upper potential limits, producing the incorporation of N and P functionalities on SWCNT through polymerization reactions, although some covalent attachment cannot be discarded. Electrochemical oxidation in presence of CNT produces polymerization of 4-APPA, what has been related to the interaction between monomer and the CNT surface.The voltammograms of the functionalized SWCNT show different well-defined redox processes that are maintained at high pH. Raman spectroscopy shows that the structure of the SWCNT is maintained even at high potentials suggesting that oxidation selectively occurs in the 4-APPA monomer favoring polymer chain growth. The degree of modification of SWCNT can be easily controlled by selecting the electrochemical conditions.

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Aqueous dispersion of multiwall carbon nanotubes with phosphonic acid derivatives

Cited by 17 publications

References 52 publications

Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles

Study of Perfluorophosphonic Acid Surface Modifications on Zinc Oxide Nanoparticles

New details of assembling bioactive films from dispersions of amphiphilic molecules on titania surfaces

Electrochemical functionalization of single wall carbon nanotubes with phosphorus and nitrogen species

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