Effective electrical conductivity of functional single-wall carbon nanotubes in aqueous fluids

Glover, Brian; Whites, K.W.; Hong, Haiping; Mukherjee, Arnab; Billups, W. E.

doi:10.1016/j.synthmet.2008.03.022

Cited by 33 publications

(22 citation statements)

References 12 publications

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“…The linear behavior in conductivity versus concentration was reported for functionalized SWCNTs in water/ethylene glycol [Glover et al, 2008]. In our study, at 93 mM (0.11% weight), s s doubled versus normal saline.…”

supporting

confidence: 72%

“…The other relevant studies of CNT-based colloids did not present results for e 0 [Liu et al, 2004;Lisunova et al, 2006;Glover et al, 2008] so there is no basis for comparison of our results. However, SWCNTs are known to have high e 0 so their affect on increasing the e 0 of the colloid was expected.…”

contrasting

confidence: 58%

“…Instead, studies were conducted using solvents with low conductivity. For example, the conductivity of functional sulfonated SWCNTs were evaluated in 50% deionized water/50% ethylene glycol (s ¼ 10 À3 S/m) from 100 kHz to 1 MHz [Glover et al, 2008]. The conductivity of multi-walled CNTs (MWCNTs) were evaluated in chloroform (s ¼ 2.67 Â 10 À8 S/m) and toluene (s ¼ 3.4 Â 10 À10 S/m) at DC [Liu et al, 2004], and in 0.01 M KCl (s ¼ 0.12 S/m) with Triton X-305 surfactant at 1 kHz [Lisunova et al, 2006].…”

Section: Introductionmentioning

confidence: 99%

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Radiofrequency interaction with conductive colloids: Permittivity and electrical conductivity of single‐wall carbon nanotubes in saline

Gach

Nair²

2010

Bioelectromagnetics

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Conductive nanoparticles may enhance tissue heating during radiofrequency (RF) irradiation. Specific absorption rate (SAR) is known to rise with the electrical conductivity of tissue. However, no studies to date have measured the relationship between complex permittivity and nanoparticle concentration in tissue-like samples. The complex permittivities of colloids containing single-wall carbon nanotubes (SWCNTs) in normal (0.9%) saline were measured from 20 MHz to 1 GHz. Carbon concentrations ranged from 0 to 93 mM (0.06% volume), based on SWCNT weight per volume. Measurements were made with 0.02% Pluronic F108 surfactant added to the colloids to prevent SWCNT flocculation. The data were fit to the Cole-Cole relaxation model with an added constant phase angle element to correct for electrode polarization effects at low RF frequencies. Electrode polarization effects increased with carbon concentration. The real parts of the permittivities of the colloids increased with carbon concentration. The static conductivity rose linearly with carbon concentration, doubling from 0 to 93 mM. The SAR of the colloids is expected to increase with RF frequency, based on the properties of the imaginary part of the permittivity.

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supporting

confidence: 72%

contrasting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Radiofrequency interaction with conductive colloids: Permittivity and electrical conductivity of single‐wall carbon nanotubes in saline

Gach

Nair²

2010

Bioelectromagnetics

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“…Glover et al [72] prepared a nanofluids that consisted of water and 0-0.5 wt.% of sulfonated carbon nanotubes. The electrical conductivity of the prepared nanofluids was measured.…”

Section: Effect Of the Alignment Of The Carbon Nanostructures On The mentioning

confidence: 99%

Nanofluids Based on Carbon Nanostructures

Younes¹,

Ghaferi²,

Saadat³

et al. 2016

Advances in Carbon Nanostructures

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A nanofluid consists in a liquid suspension of nanometer-sized particles. These fluids may contain (or not) surface-active agents to aid in the suspension of the particles. Nanometer-sized particles have higher thermal conductivity than the base fluids. Oxides, metals, nitrides, and nonmetals, like carbon nanotubes, can be used as nanoparticles in nanofluids. Water, ethylene glycol, oils, and polymer solutions can be used as base fluids. In this chapter, we summarize the recent studies of using CNTs and graphene to improve the thermal conductivity of nanofluids. Moreover, we refer to the studies about the effect of using magnetic fields on enhancing the thermal conductivity of nanofluids. Too much discrepancy about thermal conductivity of nanofluids can be found in the literature. For carbon nanofluids, unfortunately, no significant improvements on thermal conductivity are observed using low concentrations. Different improvement percentages have been reported. This variation in the thermal conductivity can be attributed to many factors, such as particle size temperature, pH, or zeta potential. We believe that more research efforts need to be made in order to, first, improve the thermal conductivity of nanofluids and, second, assess the effect of the different parameters and conditions on the thermal conductivity of nanofluids.

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“…1g). The prepared CNH is most likely of functional CNH, as CNH should display higher conductivity value [11].…”

mentioning

confidence: 99%

Synthesis of carbon nanohorn–carbon nanotube hybrids using palm olein as a precursor

Zobir

Zainal

Keng

et al. 2013

Carbon

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Effective electrical conductivity of functional single-wall carbon nanotubes in aqueous fluids

Cited by 33 publications

References 12 publications

Radiofrequency interaction with conductive colloids: Permittivity and electrical conductivity of single‐wall carbon nanotubes in saline

Radiofrequency interaction with conductive colloids: Permittivity and electrical conductivity of single‐wall carbon nanotubes in saline

Nanofluids Based on Carbon Nanostructures

Synthesis of carbon nanohorn–carbon nanotube hybrids using palm olein as a precursor

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