Characterizing dispersion and long term stability of concentrated carbon nanotube aqueous suspensions for fabricating ductile cementitious composites

Shama Parveen, Sohel Rana, Raul Fangueiro, M. C. Paiva

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Abstract

This paper reports a systematic attempt of preparing concentrated aqueous suspensions (up to 0.3 wt.%) of different types of carbon nanotubes (CNTs) using Pluronic F-127 for developing ductile cementitious composites. Single-walled and multi-walled nanotubes, both pristine and functionalized, were dispersed in water using a short (1 h) and medium energy (80 W) ultrasonication process using pluronic at high concentrations (above critical micelle concentration, 1–5 wt.%) and also using sodium dodecylbenzene sulphonate (SDBS) for comparison purpose. The CNT suspensions were characterized for agglomerate area, particle size, zeta potential, extractability and long-term storage stability for a period over 4 years. The optimum suspensions were used to fabricate cementitious composites and their fracture behavior was characterized. Experimental results suggested that the optimum pluronic concentrations (1% for 0.1% CNT, 5% for 0.2% and 0.3% CNT, all in weight percent) provided highly homogeneous CNT dispersion with very low area of agglomerates. The best dispersion quality was obtained with f-SWCNT/pluronic system, which provided very low agglomerate area (< 0.5%), lower CNT bundle size, good quantity of well dispersed nanotubes (up to 50%) and excellent long term storage stability. Cementitious composites fabricated using SWCNT and f-SWCNT suspensions showed ductile fracture behavior and improvement in fracture energy up to 164%.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalPowder Technology
Volume307
Early online date14 Nov 2016
DOIs
Publication statusPublished - 1 Feb 2017
Externally publishedYes

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Carbon Nanotubes
Poloxamer
Carbon nanotubes
Suspensions
Composite materials
Nanotubes
Fracture energy
Ductile fracture
Critical micelle concentration
Zeta potential
Sodium
Particle size
Water

Cite this

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title = "Characterizing dispersion and long term stability of concentrated carbon nanotube aqueous suspensions for fabricating ductile cementitious composites",
abstract = "This paper reports a systematic attempt of preparing concentrated aqueous suspensions (up to 0.3 wt.{\%}) of different types of carbon nanotubes (CNTs) using Pluronic F-127 for developing ductile cementitious composites. Single-walled and multi-walled nanotubes, both pristine and functionalized, were dispersed in water using a short (1 h) and medium energy (80 W) ultrasonication process using pluronic at high concentrations (above critical micelle concentration, 1–5 wt.{\%}) and also using sodium dodecylbenzene sulphonate (SDBS) for comparison purpose. The CNT suspensions were characterized for agglomerate area, particle size, zeta potential, extractability and long-term storage stability for a period over 4 years. The optimum suspensions were used to fabricate cementitious composites and their fracture behavior was characterized. Experimental results suggested that the optimum pluronic concentrations (1{\%} for 0.1{\%} CNT, 5{\%} for 0.2{\%} and 0.3{\%} CNT, all in weight percent) provided highly homogeneous CNT dispersion with very low area of agglomerates. The best dispersion quality was obtained with f-SWCNT/pluronic system, which provided very low agglomerate area (< 0.5{\%}), lower CNT bundle size, good quantity of well dispersed nanotubes (up to 50{\%}) and excellent long term storage stability. Cementitious composites fabricated using SWCNT and f-SWCNT suspensions showed ductile fracture behavior and improvement in fracture energy up to 164{\%}.",
keywords = "Carbon nanotube, Extractability, Long-term stability, Pluronic F-127, Zeta potential",
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T1 - Characterizing dispersion and long term stability of concentrated carbon nanotube aqueous suspensions for fabricating ductile cementitious composites

AU - Parveen, Shama

AU - Rana, Sohel

AU - Fangueiro, Raul

AU - Paiva, M. C.

PY - 2017/2/1

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N2 - This paper reports a systematic attempt of preparing concentrated aqueous suspensions (up to 0.3 wt.%) of different types of carbon nanotubes (CNTs) using Pluronic F-127 for developing ductile cementitious composites. Single-walled and multi-walled nanotubes, both pristine and functionalized, were dispersed in water using a short (1 h) and medium energy (80 W) ultrasonication process using pluronic at high concentrations (above critical micelle concentration, 1–5 wt.%) and also using sodium dodecylbenzene sulphonate (SDBS) for comparison purpose. The CNT suspensions were characterized for agglomerate area, particle size, zeta potential, extractability and long-term storage stability for a period over 4 years. The optimum suspensions were used to fabricate cementitious composites and their fracture behavior was characterized. Experimental results suggested that the optimum pluronic concentrations (1% for 0.1% CNT, 5% for 0.2% and 0.3% CNT, all in weight percent) provided highly homogeneous CNT dispersion with very low area of agglomerates. The best dispersion quality was obtained with f-SWCNT/pluronic system, which provided very low agglomerate area (< 0.5%), lower CNT bundle size, good quantity of well dispersed nanotubes (up to 50%) and excellent long term storage stability. Cementitious composites fabricated using SWCNT and f-SWCNT suspensions showed ductile fracture behavior and improvement in fracture energy up to 164%.

AB - This paper reports a systematic attempt of preparing concentrated aqueous suspensions (up to 0.3 wt.%) of different types of carbon nanotubes (CNTs) using Pluronic F-127 for developing ductile cementitious composites. Single-walled and multi-walled nanotubes, both pristine and functionalized, were dispersed in water using a short (1 h) and medium energy (80 W) ultrasonication process using pluronic at high concentrations (above critical micelle concentration, 1–5 wt.%) and also using sodium dodecylbenzene sulphonate (SDBS) for comparison purpose. The CNT suspensions were characterized for agglomerate area, particle size, zeta potential, extractability and long-term storage stability for a period over 4 years. The optimum suspensions were used to fabricate cementitious composites and their fracture behavior was characterized. Experimental results suggested that the optimum pluronic concentrations (1% for 0.1% CNT, 5% for 0.2% and 0.3% CNT, all in weight percent) provided highly homogeneous CNT dispersion with very low area of agglomerates. The best dispersion quality was obtained with f-SWCNT/pluronic system, which provided very low agglomerate area (< 0.5%), lower CNT bundle size, good quantity of well dispersed nanotubes (up to 50%) and excellent long term storage stability. Cementitious composites fabricated using SWCNT and f-SWCNT suspensions showed ductile fracture behavior and improvement in fracture energy up to 164%.

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KW - Long-term stability

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