Optimization of highly concentrated dispersions of multi-walled carbon nanotubes with emphasis on surfactant content and carbon nanotubes quality

Pontoreau, Maël; Emmanuel, Le Guen; Bourda, C.; Silvain, Jean‐François

doi:10.1088/1361-6528/ab9d42

Cited by 5 publications

(5 citation statements)

References 45 publications

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“…It is difficult to disperse CNTs in water or organic solvents due to their low solubility; however, chemical surface modification, third component-assisted dispersion, and mechanical mixing methods can improve solubility [21][22][23][24] . In this study, all three methods were applied to ensure homogeneous dispersion of CNTs in the trifluoroacetic acid (TFA)/tetrahydrofuran (THF)/isopropyl alcohol (IPA) solution for obtaining a uniform coating of CNTs on the unexposed surfaces of the strands constituting the spandex fibers.…”

Section: Results and Discussion Multi-angle Fiber Arrayed Fabric Sensormentioning

confidence: 99%

Development of multi-angle fiber array for accurate measurement of flexion and rotation in human joints

et al. 2021

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Herein, we have proposed a method that uses a highly stretchable and conductive fiber-based multi-angle fiber array, which precisely measures human joint motion in various degrees of freedom (flexion and rotation) at the shoulders, knees, and wrists in real time. By embedding conductive carbon nanotubes (CNTs) within spandex fibers of high elasticity and shape recovery ratio, we monitored joint motion stably without degrading the fiber’s conductivity even during repeated stretching and contraction of different lengths. The strain occurring in a specific direction was monitored using mapping images generated due to the change in resistance that occurred when 12 CNT-embedded spandex fibers arranged in radial lines at intervals of 15° were stretched or contracted by an external force. The proposed high-precision joint-monitoring technology measures human motion accurately and is applicable for use in wearable healthcare devices that require precise measurements.

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Section: Results and Discussion Multi-angle Fiber Arrayed Fabric Sensormentioning

confidence: 99%

Development of multi-angle fiber array for accurate measurement of flexion and rotation in human joints

et al. 2021

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“…Characteristic G band (1580 cm −1 ) corresponding to sp 2 -C bond and D band (1350 cm −1 ) corresponding to the defects in the C-lattice were obtained for MWNTs. The relative intensity of D and G bands is commonly used to evaluate the amounts of defects in the structure of MWNT [30]. The average I D /I G ratios for pristine MWNTs range from 0.719 to 2.28 in literature [23,30].…”

Section: Resultsmentioning

confidence: 99%

“…The relative intensity of D and G bands is commonly used to evaluate the amounts of defects in the structure of MWNT [30]. The average I D /I G ratios for pristine MWNTs range from 0.719 to 2.28 in literature [23,30]. The lower the ratio the better is the structure of MWNT.…”

Section: Resultsmentioning

confidence: 99%

“…This makes its dispersion in solvents or polymeric matrix a daunting task [21,22]. Preparation of nanodispersions of MWNTs is still an active area of research as reflected by numerous recent research and review articles in this field [23][24][25][26][27][28][29][30][31][32]. MWNTs are detangled by energetic agitation utilizing ultrasonication [33,34] and the resulting dispersions are stabilized by attaching functional groups on the tube walls either by covalent bonding [35][36][37][38][39] or by noncovalent adsorption of molecules [40,41].…”

Section: Introductionmentioning

confidence: 99%

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Concentration dependent debundling and single tube dispersions of pristine multiwalled carbon nanotubes functionalized with double tail phospholipids

Nigam¹

2021

Nanotechnology

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Multiwalled carbon nanotubes (MWNTs) exist as aggregates of highly entangled tubes due to large aspect ratios and strong Van der Waals interactions among them in their native states. In order to render them suitable for any application, MWNTs need to be separated and dispersed uniformly in a solvent preferably as individual tubes. In the present work, it is demonstrated that a double tail lipid such as 1, 2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) is capable of dispersing MWNTs in ethanol. Ultra-stable suspensions were obtained by optimizing two key parameters: DPPE to MWNT weight ratio (ε) and MWNT concentration (c). Stability of the suspensions increased with the increasing ε value up to an optimum point (ε = 1.8) and then decreased drastically beyond that. CNT dispersions with ε = 1.8 were extremely stable (with a Zeta potential of 108.26 ± 2.15 mV) and could be retained in suspended form up to 3 months. Effect of MWNT concentration on disaggregation was very significant and stable suspensions could be formed for MWNT concentrations only below 0.14 mg ml−1. Above this concentration, no stable dispersions could be obtained even with ε = 1.8. Compression isotherms of Langmuir monolayers of the DPPE functionalized MWNTs spread at the air water interface were highly repeatable, suggesting that the MWNTs in dispersion were present as separate tubes coated with phospholipids. SEM micrographs of the Langmuir–Blodgett (LB) films, deposited at high surface pressures on silicon wafers, show that MWNTs remain as single nanotubes with no signs of reaggregation. TEM micrographs of MWNT suspensions indicated random adsorption of DPPE on MWNTs. Our work makes it possible to explore potential applications of LB films of MWNTs (stabilized by DPPE) in the development of conducting thin films for sensor applications or as supports to immobilize catalysts for heterogenous reactions.

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“…The SWNTs are generally narrower than the MWNTs with diameters typically in the range of 1-2 nm, and tend to be curved rather than straight (Saifuddin et al, 2013;Cheng et al, 2020;Rudyak et al, 2021). MWNTs are composed of multiple SWNTs that are placed concentrically within each other (Shen et al, 2011;Pontoreau et al, 2020). There are three techniques that have been developed to produce CNTs: discharge, laser ablation, and chemical vapor deposition (CVD) (See & Harris, 2007;Purohit et al, 2014;Taylor et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes as control agents against the Khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae)

Al‐Esawy

Alshukri

Kadhim³

2021

Agraria

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This may be attributed to the facts that nanotechnology has shown an excellent ability to control the release pattern of active ingredients of pesticides, so that it can achieve long-term functions more effectively, thus overcoming the problems of agricultural runoff and residual pesticide accumulation. In addition, Nanopesticides have shown greater solubility and stability of active ingredients, which can effectively control pests (Akhtar et al.,2020). In this study, the insecticidal relative toxicity of carbon nanotubes (CNTs) synthesized from seeds of Iraqi date palm Phoenix dactylifera L. using a chemical vapor deposition (CVD) method was investigated. These Nanoparticles were evaluated against adult and larvae of the Khapra beetle, Trogoderma granarium. The results indicated that CNTs (25, 50 and 100 ppm) caused mortality of the Khapra beetle under laboratory conditions. Additionally, the germination percentage of wheat, Triticum aestivum L. grains, has not been affected by the carbon nanotube treatments at 25-100 ppm. This study demonstrates the potential of CNTs as a technology for population control of T. granarium because of their toxicity to larvae and adults.

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Optimization of highly concentrated dispersions of multi-walled carbon nanotubes with emphasis on surfactant content and carbon nanotubes quality

Cited by 5 publications

References 45 publications

Development of multi-angle fiber array for accurate measurement of flexion and rotation in human joints

Development of multi-angle fiber array for accurate measurement of flexion and rotation in human joints

Concentration dependent debundling and single tube dispersions of pristine multiwalled carbon nanotubes functionalized with double tail phospholipids

Carbon nanotubes as control agents against the Khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae)

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