Dynamic mechanical properties of multi-walled carbon nanotube/poly(acrylic acid)-surfactant complex

Jin, Zhaoxia; Goh, S. H.; Xu, Guiming; Park, Y.W.

doi:10.1016/s0379-6779(02)00824-x

Cited by 8 publications

(4 citation statements)

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“…Traditional surfactants, such as sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, sodium n -lauroylsarcosinate, satisfy these requirements and provide stable NT dispersions. However, these dispersions are formed only when these surfactants are present in very high concentrations, − which is often undesirable for subsequent nanotube processing. Significant improvement of the dispersion efficiency can be obtained with polymeric agents. − Overall, the efficiency of solubilization increases in most cases as the surfactant or polymer molecular weight increases.…”

Section: Resultsmentioning

confidence: 99%

Aqueous Dispersions of Single-wall and Multiwall Carbon Nanotubes with Designed Amphiphilic Polycations

et al. 2005

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Poor solubility of single-walled and multiwalled carbon nanotubes (NTs) in water and organic solvents presents a considerable challenge for their purification and applications. Macromolecules can be convenient solubilizing agents for NTs and a structural element of composite materials for them. Several block copolymers with different chemical functionalities of the side groups were tested for the preparation of aqueous NT dispersions. Poly(N-cetyl-4-vinylpyridinium bromide-co-N-ethyl-4-vinylpyridinium bromide-co-4-vinylpyridine) was found to form exceptionally stable NT dispersions. It is suggested that the efficiency of macromolecular dispersion agents for NT solubilization correlates with the topological and electronic similarity of polymer-NT and NT-NT interactions in the nanotube bundles. Raman spectroscopy and atomic force and transmission electron microcopies data indicate that the polycations are wrapped around NTs forming a uniform coating 1.0-1.5 nm thick. The ability to wind around the NT originates in the hydrophobic attraction of the polymer backbone to the graphene surface and topological matching. Tetraalkylammonium functional groups in the side chains of the macromolecule create a cloud of positive charge around NTs, which makes them hydrophilic. The prepared dispersions could facilitate the processing of the nanotubes into composites with high nanotube loading for electronic materials and sensing. Positive charge on their surface is particularly important for biological and biomedical applications because it strengthens interactions with negatively charged cell membranes. A high degree of spontaneous bundle separation afforded by the polymer coating can also be beneficial for NT sorting.

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Section: Resultsmentioning

confidence: 99%

Aqueous Dispersions of Single-wall and Multiwall Carbon Nanotubes with Designed Amphiphilic Polycations

et al. 2005

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“…Zeng et al [7] reported enhanced thermal stability, significantly reduced shrinkage by adding 5 wt% carbon nanofiber to PMMA matrix. Jin et al [8,9] found an increase on the storage modulus and higher glass transition temperature of MWNTs /PMMA composites and MWNTs/poly(acrylic acid) complex. Gojny and Shulte [10] concluded that an increase in the amount of nanotubes led to an increase of glass transition temperature for MWNTs/epoxy composites and that samples containing functionalised nanotubes had a stronger influence on glass transition temperature of MWNTs/epoxy composites.…”

Section: Introductionmentioning

confidence: 99%

Glass Transition Temperature of Phenolic-Based Nanocomposites Reinforced by MWNTs and Carbon Fibers

Yeh

Tai

Lin

2007

KEM

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The multi-walled carbon nanotubes (MWNTs) and carbon fibers (CFs) were added to the phenolic resin to fabricate MWNTs/phenolic, MWNTs/CFs/phenolic nanocomposites and CFs/phenolic composites by hot press method. The differential scanning calorimetry (DSC) test was performed for the above-mentioned three kinds of composites. The valley points on the slope of endothermic responses correspond to the glass transition temperatures of the composites. The MWNTs/phenolic nanocomposites had the lowest glass transition temperature among the three kinds of composites discussed, which indicated a better thermal conductivity property of MWNTs. Phenolic-based composites reinforced by different weight percentages of MWNTs and CFs were also investigated. The tensile failure morphologies of nanocomposite specimens were examined using a scanning electron microscope to evaluate the possible effects on the glass transition temperature of nanocomposites..

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“…Chemical treatments of CNTs with concentrated nitric acid or sulfuric acid, or both [16,17], allowed grafting of -OH or -COOH on CNTs surfaces and reduced the physical entanglements of the CNTs. Treatment with surfactants [18][19][20] could reduce the surface tension of the CNTs and improve the wetting between the CNTs and liquid media, such as deionized water. In recent research, several methods were commonly used for dispersion of CNTs.…”

Section: Introductionmentioning

confidence: 99%

Heterocoagulation System Assisted Adsorption of Carbon Nanotubes on Alumina for Toughening Ceramics

Shi

Zhu

Zhang

et al. 2007

Journal of Reinforced Plastics and Composites

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A heterocoagulation process was adopted to disperse homogenously multi-walled carbon nanotubes (CNTs) into alumina powders via liquid medium and deposit uniform CNTs on the surfaces of alumina particles. Alumina composites with an addition of 2wt% CNTs were prepared by spark plasma sintering (SPS). The mechanical properties of the composites were characterized as a fracture toughness of 6.35 ± 0.15 MPa m0.5, 1.7 times that of pristine alumina ceramics, and also much improved compared to that of alumina ceramics added with pristine CNTs but without the heterocoagulation processing with surfactants. The fracture morphologies showed visually the bridging and pull out effects of the CNTs at interfaces between the alumina grains. The results indicated that the loads during the mechanical tests were efficiently transferred from the alumina matrix to the CNTs and dissipated, and then led to the improvement of mechanical properties.

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Dynamic mechanical properties of multi-walled carbon nanotube/poly(acrylic acid)-surfactant complex

Cited by 8 publications

References 0 publications

Aqueous Dispersions of Single-wall and Multiwall Carbon Nanotubes with Designed Amphiphilic Polycations

Aqueous Dispersions of Single-wall and Multiwall Carbon Nanotubes with Designed Amphiphilic Polycations

Glass Transition Temperature of Phenolic-Based Nanocomposites Reinforced by MWNTs and Carbon Fibers

Heterocoagulation System Assisted Adsorption of Carbon Nanotubes on Alumina for Toughening Ceramics

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