Dimethylformamide: an effective dispersant for making ceramic–carbon nanotube composites

Inam, Fawad; Yan, Haixue; Reece, Michael J.; Peijs, Ton

doi:10.1088/0957-4484/19/19/195710

Cited by 121 publications

(74 citation statements)

References 49 publications

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“…As previously reported by Inam et al [32], DMF was found to be a much more effective dispersant than ethanol for making stable, homogeneous CNT and composite dispersions. The liquid mixture was rotation ball milled for 7 h. It was then dried at 60 °C for 12 h using a rotary drier containing milling media (3 mm alumina balls), followed by vacuum oven drying at 100 °C for 48 h. To avoid re-agglomeration of carbon nano-fillers during lengthy drying, the alumina balls (milling media) was added during rotary drying and this approach has not been previously reported.…”

Section: Methodssupporting

confidence: 73%

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Bhat

Daoush

2014

Ceramics International

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA novel method for analysing structural health of alumina nanocomposites filled with graphene nanoplatelets (GNP), carbon nanotubes (CNTs) and carbon black nano-particles (CB) is presented. All nanocomposites were prepared using novel colloidal processing and then by Spark Plasma Sintering.Good homogeneous dispersion was observed for all carbon filled materials. Nanocomposite bars were indented to produce sub-surface damage. Change in electrical conductivities were analysed after indentation to understand structural damage. For correlating change in electrical conductivity and Page 2 of 15 indentation damage and understanding damage tolerance, mechanical properties were compared.Because of the systematically induced indentation damage, a sharp decrease of 86% was observed in the electrical conductivity of CNT nanocomposite as compared to 69% and 27% in the electrical conductivities of GNP nanocomposites and CB nanocomposites respectively. CNTs impart superior damage sensing capability in alumina nanocomposites, in comparison to GNP and CB, due to their fibrous nature, high aspect ratio and high electrical conductivity.

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Section: Methodssupporting

confidence: 73%

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Bhat

Daoush

2014

Ceramics International

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“…The CNTs were dispersed in DMF [33] via high power bath sonication for 2 hrs and then hand mixed with alumina powder for another 5 min. The liquid mixture was transferred to another nylon jar filled with zirconia balls (milling media) of two different sizes (10 and 5 mm, mass ratio: 3:2).…”

Section: Powder Preparationmentioning

confidence: 99%

“…The jar was sealed and rotation ball milled for 6 hrs at ~200 rpm. The milled slurry mixture was dried at 100 o C for 5 hrs in a rotary evaporator in the presence of 5 mm zirconia balls to avoid re-aggregation of CNTs [33]. The dried power was than dried in an oven (85 •C) for 24 hrs for complete removal of DMF.…”

Section: Powder Preparationmentioning

confidence: 99%

The production of advanced fine-grained alumina by carbon nanotube addition

Inam

Peijs

Reece

2011

Journal of the European Ceramic Society

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Alumina and alumina+1vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300-1500 •C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D50: 356±74 nm), minimal grain growth (∼450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 •C) of alumina+1vol.% CNT composite, compared to alumina sintered without CNTs. Alumina and alumina + 1 vol.% carbon nanotube (CNT) composites were fully densified by spark plasma sintering. Post-sintering heat treatments (1300 -1500 o C) were performed to completely oxidize CNTs and then densify the remaining 1 vol.% to produce fine-grained ceramics. The grain size and Vickers hardness of the heat-treated composites were compared with the monolithic alumina sintered without CNT addition. Compared to the initial powder particle size of alumina (D 50 : 356 nm ± 74 nm), minimal grain growth (~450 nm) was observed for the fully dense heat-treated composites. A 25% improvement in Vickers hardness and >10 times finer average grain size were observed for alumina produced by the heat treatment (1300 o C) of alumina + 1 vol.% CNT composite, compared to alumina sintered without CNTs. Introduction

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“…So, colloids with high zeta potential (negative or positive) are electrically stabilized while colloids with low zeta potentials tend to coagulate or flocculate. Inam 16 reported that the DMF is good dispersant compare to ethanol for making homogeneous MWCNTs, stable and composite dispersion. Besides, the benefit of using organic compound as dispersant is due to the low boiling point which can remove easily and avoid any residue leave in the deposited film.…”

Section: Methodsmentioning

confidence: 99%

Dimethyl formamide as Dispersing Agent for Electrophoretically Deposited of Multi-Walled Carbon Nanotubes

Mohamed¹

2016

IPCSE

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Dispersing agents used during electrode position process are required to form stable suspension of solution at room temperature for controllable thickness of deposited materials. The solvent selected for dispersion of multi-walled carbon Nanotubes (MWCNTs) are mixture of acetone and ethanol, dimethyl formamide (DMF), N-methyl-2-pyrrolidone (NMP) and distilled water were investigated. Among these solvents, DMF shows better suspension stability and performed well during electrophoretic deposition (EPD) of MWCNTs on nickel substrate. Analysis by scanning electron microscopy (SEM) shows the maximum of 4.78 µm thick of MWCNTs deposited on nickel substrate when operated under150V applied voltage, 10 minutes deposition time for 0.50 mg/ml concentration.

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Dimethylformamide: an effective dispersant for making ceramic–carbon nanotube composites

Cited by 121 publications

References 49 publications

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Structural health monitoring capabilities in ceramic–carbon nanocomposites

The production of advanced fine-grained alumina by carbon nanotube addition

Dimethyl formamide as Dispersing Agent for Electrophoretically Deposited of Multi-Walled Carbon Nanotubes

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