Gemini surfactants as efficient dispersants of multiwalled carbon nanotubes: Interplay of molecular parameters on nanotube dispersibility and debundling

Abreu, Bárbara; Rocha, Jessica; Fernandes, Ricardo M.F.; Regev, Oren; Furó, István; Marques, Eduardo F.

doi:10.1016/j.jcis.2019.03.082

Cited by 38 publications

(24 citation statements)

References 65 publications

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“…The surfactant concentrations used were 5 mmol•kg −1 TTAB for MWNTs and 10 mmol•kg −1 SC for TMDs. These values of surfactants concentrations were chosen to ensure that maximum dispersibility of each nanomaterial was attained, according to our previous studies with MWNTs [44][45][46] and to recent data on dispersibility of the two TMDs using SC (see Supplementary Figure S1.4a).…”

Section: Assembly Of the Nanocomposite Materialsmentioning

confidence: 99%

“…Both mixtures were then tip-sonicated, using a Sonics VC 505 with a freshly polished 13 mm tip (500 W, 20 kHz). The vibration amplitude and sonication time were set to 60% and 5 min for MWNTs, and 50% and 23 min for TMDs, as previously optimized [44][45][46]. The total energy transferred per unit mass was 0.20 kJ•mg −1 for MWNTs and 0.84 kJ•mg −1 for TMDs.…”

Section: Assembly Of the Nanocomposite Materialsmentioning

confidence: 99%

“…In this work, we report the assembly of nanocomposites combining MWNTs and two TMDs, WS2 and MoS2, and the performance of the obtained WS2@MWNT and MoS2@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 1a-c.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Assembly Of the Nanocomposite Materialsmentioning

confidence: 99%

Section: Assembly Of the Nanocomposite Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Gemini or dimeric surfactants, with two polar heads and two hydrocarbon tails per molecule separated by a spacer group connected at the level of the headgroups, have been subject of great attention, both from fundamental [16,17] and applicationoriented perspectives [18,19]. This continuous interest results from their unique physicochemical properties, which can be modified by adjusting their structural elements, namely the polar headgroups, hydrocarbon tails and covalent spacer [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effective cytocompatible nanovectors based on serine-derived gemini surfactants and monoolein for small interfering RNA delivery

Costa

Oliveira

Silva

et al. 2021

Journal of Colloid and Interface Science

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“…Recent studies indicate the application of cationic gemini surfactants as efficient tools in retardation during the dyeing process and dye solubilisation [3,4,5], corrosion inhibition [6,7,8,9,10,11,12,13,14], as air entrenching agents for concrete [15,16], in enhanced oil recovery [17,18], lignite [19], and coal pitch [20] moistening, etc. Cationic gemini bisammonium surfactants also play an important role in modern nanotechnologies as modifiers of silica nanosheets [21], dispersants of carbon nanotubes [22], or efficient stabilisers of silver [23,24,25] and gold nanoparticles [26,27]. Due to their molecular structure consisting of two hydrophobic chains and two ammonium polar heads connected with a spacer, aggregation properties of gemini surfactants are superior to those of conventional single-chain surfactants.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis, Self-Assembled Structures, and Microbicidal Activity of Cationic Gemini Surfactants with Branched Tridecyl Chains

et al. 2019

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Cationic gemini surfactants with polymethylene spacer and linear alkyl chains containing an even number of carbon atoms have been extensively studied in the recent past, with the emphasis put on the determination of their aggregation behaviour in aqueous solution and their biological properties. However, the information on the aggregation of branched gemini surfactants with an odd number of carbon atoms in their alkyl chains is only sparsely reported in the literature. To help cover this gap in the research of cationic gemini surfactants, a series of branched bisammonium cationic gemini surfactants with an odd number of carbon atoms in alkyl chains (tridecane-2-yl chains) and a polymethylene spacer with a variable length ranging from 3 to 12 carbon atoms have been synthesized and investigated. Critical micelle concentration, which was determined by three methods, was found to be in the order 10−4 mol/L. A comparison of the obtained data of the novel series of tridecyl chain geminis with those of gemini surfactants with dodecyl chains and an identical spacer structure revealed that structural differences between both series of gemini surfactants result in different aggregation and surface properties for surfactants with 6 and 8 methylene groups in the spacer (N,N’-bis(tridecane-2-yl)-N,N,N’,N’-tetramethylhexane-1,6-diaminium dibromide and N,N’-bis(tridecane-2-yl)-N,N,N’,N’-tetramethyloctane-1,8-diaminium dibromide) with the cmc values 8.2 × 10−4 mol/L and 6.5 × 10−4 mol/L, respectively, as determined by surface tension measurements. Particle size analysis showed the formation of small stable spherical micelles in the interval between 2.8 and 5 nm and with zeta potential around +50 mV, which are independent of surfactant concentration and increase with the increasing spacer length. Microbicidal activity of 13-s-13 gemini surfactants was found to be efficient against Gram-positive, Gram-negative bacteria and yeast.

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Gemini surfactants as efficient dispersants of multiwalled carbon nanotubes: Interplay of molecular parameters on nanotube dispersibility and debundling

Cited by 38 publications

References 65 publications

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

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

Effective cytocompatible nanovectors based on serine-derived gemini surfactants and monoolein for small interfering RNA delivery

The Synthesis, Self-Assembled Structures, and Microbicidal Activity of Cationic Gemini Surfactants with Branched Tridecyl Chains

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