Electrical properties of nanoceramics reinforced with ropes of single-walled carbon nanotubes

Zhan, Guo‐Dong; Kuntz, Joshua D.; Garay, Javier E.; Mukherjee, Amiya K.

doi:10.1063/1.1600511

Cited by 217 publications

(114 citation statements)

References 18 publications

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“…Samples with higher densities showed higher modulus as well as higher hardness and fracture toughness. Similar results have been obtained on introducing SWCNTs into alumina by SPS 70,71 ; apparently undamaged CNTs were incorporated at the grain boundaries, resulting in improved fracture toughness and bending strength (although see below for discussion). Table 1 summarises the mechanical properties of CNT/inorganic matrix composites reported in the literature, including a number of significant improvements achieved by addition of CNTs.…”

Section: Advanced Consolidation Techniquessupporting

confidence: 69%

“…Powder processing has been applied to various composites systems including borosilicate glass 33,63 , silicon nitride 64-69 alumina, 70,71 , mullite 72 and silica 73 matrix composites containing different concentrations of CNTs (typically 1 -10 vol.%). These investigations have been of mixed success in terms of the quality of the microstructure homogeneity and properties achieved (see section 4).…”

Section: Powder Processingmentioning

confidence: 99%

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Ceramic matrix composites containing carbon nanotubes

2009

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Due to the remarkable physical and mechanical properties of individual, perfect carbon nanotubes (CNTs), they are considered to be one of the most promising new reinforcements for structural composites. Their impressive electrical and thermal properties also suggest opportunities for multifunctional applications. In the context of inorganic matrix composites, researchers have particularly focussed on CNTs as toughening elements to overcome the intrinsic brittleness of the ceramic or glass material. Although there are now a number of studies published in the literature, these inorganic systems have received much less attention than CNT/polymer matrix composites. This paper reviews the current status of the research and development of CNT-loaded ceramic matrix composite materials. It includes a summary of the key issues related to the optimisation of CNT-based composites, with particular reference to brittle matrices and provides an overview of the processing techniques developed to 2 optimise dispersion quality, interfaces and density. The properties of the various composite systems are discussed, with an emphasis on toughness; a comprehensive comparative summary is provided, together with a discussion of the possible toughening mechanism that may operate. Lastly, a range of potential applications are discussed, concluding with a discussion of the scope for future developments in the field.3

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Section: Advanced Consolidation Techniquessupporting

confidence: 69%

Section: Powder Processingmentioning

confidence: 99%

Ceramic matrix composites containing carbon nanotubes

2009

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“…CNTs have already demonstrated their role as a multi-functional filler for various ceramic [6][7][8][9][10][11][12] and polymer [13][14][15][16] nanocomposites. However, CNT aggregation during processing of such nanocomposites is one of the major obstacles for their successful exploitation.…”

Section: Introductionmentioning

confidence: 99%

“…Such entangled bundles of CNTs cause significant reduction in the properties of ceramic nanocomposites [18]. Agglomerates of CNTs reduce the mechanical [13,[19][20][21] and electrical properties [11,20] of various nanocomposites. To date, colloidal processing [22][23][24] has proven to be the most successful way of producing homogeneous suspensions of CNTs.…”

Section: Introductionmentioning

confidence: 99%

Effects of dispersion surfactants on the properties of ceramic–carbon nanotube (CNT) nanocomposites

Inam

Heaton

Brown

et al. 2014

Ceramics International

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Gum Arabic (GA), Sodium Dodecyl Sulfate (SDS) and their mixture were used for the dispersion of multi-walled carbon nanotubes (CNTs) in an alumina matrix. A good dispersion at low loadings (0.5-1 wt%) of CNTs in alumina was achieved by an ultrasonic bath treatment. Dispersions were evaluated by UV-vis spectroscopy and agglomerate size analysis. The mixture of GA and SDS produced good dispersion as compared to GA and SDS alone. Nanocomposite powders were sintered by Spark Plasma Sintering (SPS). Microstructural, electrical and mechanical characterizations of sintered discs were carried out to evaluate the effectiveness of the different dispersants. The mixture of GA and SDS produced homogeneous and agglomerate-free CNT-alumina nanocomposites with higher electrical conductivity and indentation fracture toughness as compared to nanocomposites prepared using GA and SDS alone.

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“…With many publications in processing nanocrystalline aluminum oxide, Zhan et al, and Duan et al demonstrated improved fracture toughness, of upto three times than that of aluminum oxide, using spark plasma sintering consolidation of CNT-A1 2 0 3 composite, Fig 2.24 [125,166,171,[186][187][188][189][190][191]. However, the primary interest of Zhan et showing CNT pullout [11].…”

Section: Aluminum Oxide-cnt Nanocompositementioning

confidence: 99%

Role of carbon nanotube dispersion in fracture toughening of plasma sprayed aluminum oxide - carbon nanotube nanocomposite coating

Balani¹

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Balani, Kantesh, "Role of carbon nanotube dispersion in fracture toughening of plasma sprayed aluminum oxide -carbon nanotube nanocomposite coating" (2007 Rameshwar Ajja for their tacit support, thoughtful concern, and unselfish care during hard times. I also thank Mr. Navneet Pate and Ms. Sonali Pate for their kind support.They all pulled me together whenever I was down. They were a source of strength in me. Due to its excellent mechanical properties and bending strength, carbon nanotubes (CNT)is an ideal reinforcement for A1 2 0 3 matrix to improve its fracture toughness.The role of CNT dispersion in the fracture toughening of the plasma sprayed Reinforcement by CNTs is described by its bridging, anchoring, hook formation, impact alignment, fusion with splat, and mesh formation.The A1 2 0 3 /CNT interface is critical in assisting the stress transfer and utilizing excellent mechanical properties of CNTs. Mathematical and computational modeling using ab-initio principle is applied to understand the wetting behavior at the A1 2 0 3 /CNT interface. Contrasting storage modulus was obtained by nanoindentation (~ 210, 250, 250-350 and 325-420 GPa in A-SD, A4C-B, A4C-SD, and A8C-SD coatings respectively) depicting the toughening associated with CNT content and dispersion.ix

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Electrical properties of nanoceramics reinforced with ropes of single-walled carbon nanotubes

Cited by 217 publications

References 18 publications

Ceramic matrix composites containing carbon nanotubes

Ceramic matrix composites containing carbon nanotubes

Effects of dispersion surfactants on the properties of ceramic–carbon nanotube (CNT) nanocomposites

Role of carbon nanotube dispersion in fracture toughening of plasma sprayed aluminum oxide - carbon nanotube nanocomposite coating

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