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https://hdl.handle.net/1822/44181
Título: | Characterizing dispersion and long term stability of concentrated carbon nanotube aqueous suspensions for fabricating ductile cementitious composites |
Autor(es): | Parveen, Shama Rana, Sohel Fangueiro, Raúl Paiva, M. C. |
Palavras-chave: | Carbon nanotube Pluronic F-127 Extractability Zeta potential Long-term stability |
Data: | 2017 |
Editora: | Elsevier |
Revista: | Powder Technology |
Resumo(s): | 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 mediumenergy (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 suspensionswere 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 lowarea of agglomerates. The best dispersion qualitywas obtained with f-SWCNT/pluronic system, which provided very low agglomerate area (b0.5%), 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%. |
Tipo: | Artigo |
Descrição: | "Available online 14 November 2016" |
URI: | https://hdl.handle.net/1822/44181 |
DOI: | 10.1016/j.powtec.2016.11.010 |
ISSN: | 0032-5910 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | DET/2C2T - Artigos em revistas internacionais com arbitragem científica IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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7_2016 Characterizing dispersion and long term stability of concentrated carbonnanotube aqueous suspensions for fabricating ductile cementitiouscomposites.pdf Acesso restrito! | 1,25 MB | Adobe PDF | Ver/Abrir |