Aggregation kinetics of SDBS-dispersed carbon nanotubes in different aqueous suspensions

Li, Ju; Zhang, Wei; Wang, Xuejun; Hu, Jundong; Zhang, Yuling

doi:10.1016/j.colsurfa.2012.06.015

Cited by 70 publications

(38 citation statements)

References 37 publications

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“…The reactivity of CNTs is also directly related to the number of structural defects (Stone-Wales, waviness, distortion of p-orbitals, etc.) (Ju et al, 2012;Tofighy and Mohammadi, 2011;Tan et al, 2012). The stability of CNTs dispersions in aqueous media is in fact competition between van der Waals and repulsive forces (all electric double layer repulsive forces) and weak Brownian motion.…”

Section: Interactions Of Cnts With Water Environment Elementsmentioning

confidence: 99%

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

et al. 2015

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Section: Interactions Of Cnts With Water Environment Elementsmentioning

confidence: 99%

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

et al. 2015

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“…However, MWCNTs in refrigerant are likely to form clusters and then settle down due to their high aspect ratio, large surface area and strong Van der Waals attraction force [16,17]. The dispersion stability of MWCNTs in water-surfactant mixture [10,11,16,[19][20][21][22][23][24][25][26] and aqueous solution-surfactant mixture [18] Table 1, and the transmission electron microscope (TEM) photographs are shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Dispersion stability of multi-walled carbon nanotubes in refrigerant with addition of surfactant

Lin

Peng

Ding

2015

Applied Thermal Engineering

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“…It is reported in literature that during acid treatment carboxyl group attached to the CNTs surfaces leads to breaking of CNTs into shorter with less twisted shreds, hence results in better dispersion of fCNTs in basefluids. There are no van der Waals forces between f-CNTs because of ionization of acidic surface group on fCNTs which increases the electrostatic repulsion between them and make them more dispersible in basefluids in comparison to p-CNTs [6,13,15,21]. …”

Section: Effect Of Type Of Cnts On the Dispersion Of P-cnts And F-cntmentioning

confidence: 99%

“…Then 1 mL sample was taken out from the supernatant to measure the CNT concentration and rest of the sample were placed for further analysis. The concentration of CNTs was measured using UVspectrophotometer at 800 nm because at 800 nm the absorbance due to the presence of surfactant is negligible [19][20][21][22]. The thermal conductivity was measured using KD2 Pro thermal property analyzer (Decagon devices, Inc., USA) based on transient hot wire technique at room temperature.…”

Section: Experimental Procedures and Apparatusmentioning

confidence: 99%

Combined Effect of Surface Treatment and Surfactant on CNT Nanofluids Preparation

Sharma¹,

Sharma²,

Gupta³

et al. 2017

Proceedings of the 2nd World Congress on New Technologies

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-CNT nanofluids deliver better rate of heat transfer due to the presence of CNTs which are having high thermal conductivity. Since CNTs are hydrophobic in nature , they entangle themselves and form agglomerates specially in polar solvents. The agglomerates settle down with time and cause reduction in thermo-physical properties and hence lose their potential to deliver better rate of heat transfer. This characteristic of CNT nanofluids requires an efficient preparation method which can provide uniform dispersion of CNTs for a longer duration. This study has been focused on preparation of long term stable CNT nanofluids having effective dispersion of CNTs by the removal of agglomerates which were formed during preparation. To disperse CNTs in water two type of surfactants i.e. sodium dodecylbenzene sulfonate (SDBS) and gum arabic (GA) were used followed by ultrasonication. Based on results, it was analyzed that there is an optimum concentration of both the surfactants which provide maximum dispersion of pristine (p-CNTS) and functionalized (f-CNTS) at particular ultrasonication time. The maximum dispersion concentration of f-CNTs was found to be more than p-CNTs under same conditions. The dispersion of CNTs was more in case when GA was used as surfactant in comparison to SDBS irrespective of ultrasonication time while the thermal conductivity was more for SDBS based CNT nanofluids instead of GA irrespective of type of CNTs. The thermal conductivity of CNT nanofluids was sufficiently high that can be utilized in industries where there is requirement of heat transfer.

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Aggregation kinetics of SDBS-dispersed carbon nanotubes in different aqueous suspensions

Cited by 70 publications

References 37 publications

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

Dispersion stability of multi-walled carbon nanotubes in refrigerant with addition of surfactant

Combined Effect of Surface Treatment and Surfactant on CNT Nanofluids Preparation

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