The synergistic effect between surfactant and nanoparticle on the viscosity of water-based fluids

Zhou, Juying; Hu, Meibing; Jing, Dengwei

doi:10.1016/j.cplett.2019.04.052

Cited by 23 publications

(14 citation statements)

References 20 publications

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“…Thus, the hypothesis of the current research work came true as the anti-friction properties of WS 2 were reflected well in the nanofluids in the form of reduced viscosity. Moreover, the synergistic effect of small concentrations of the SDS surfactant with WS 2 NPs was also observed and found to be well in agreement with the results reported by Zhou et al [ 26 ]. The pristine nanofluids showed ~8.2% less viscosity when compared with the EG base fluid, while with the addition of 0.05 vol% SDS, it was further reduced to ~10.5% for the 0.005% WS 2 /EG nanofluids.…”

Section: Resultssupporting

confidence: 91%

“…As reported earlier, besides improvements in the dispersion stability, the surfactant can also reduce the viscosity. For instance, Zhou et al have shown that the analogous micelle effect of SDS can lower the viscosity of water-based TiO 2 nanofluids on top of the lubrication effect of nanoparticles [ 26 ]. As previously stated, SDBS and CTAB have not been explored in terms of their synergistic rheological property modifications.…”

Section: Introductionmentioning

confidence: 99%

“…As previously stated, SDBS and CTAB have not been explored in terms of their synergistic rheological property modifications. Therefore, in the present work, various surfactants, such as anionic (SDS, SDBS) and cationic (CTAB) surfactants, were chosen as an economical means for two reasons: firstly, to exploit their steric hindrance effect for the better dispersion of WS 2 /EG nanofluids [ 27 ]; secondly, the interfacial tension lowering characteristics may also contribute towards viscosity reduction [ 26 ]. Therefore, in the present work, a comprehensive experimental evaluation of WS 2 /EG nanofluids’ dispersion stability at 25 °C and the thermal conductivity in a particular temperature range (25–70 °C) has been carried out.…”

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

et al. 2020

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Developing stable nanofluids and improving their thermo-physical properties are highly important in heat transfer applications. In the present work, the stability, thermal conductivity, and rheological properties of tungsten disulphide (WS2) nanoparticles (NPs) with ethylene glycol (EG) were profoundly examined using a particle size analyzer, zeta-sizer, thermal property analyzer, rheometer, and pH measuring system. WS2 NPs were characterized by various techniques, such as XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared Spectroscopy), FESEM (Field emission scanning electron microscopy), and high-resolution transmission electron microscopy (HRTEM). The nanofluids were obtained with the two-step method by employing three volume concentrations (0.005%, 0.01%, and 0.02%) of WS2. The influence of different surfactants (Sodium dodecyl sulphate (SDS), Sodium dodecylbenzenesulfonate (SDBS), Cetyltrimethylammonium bromide (CTAB)) with various volume concentrations (0.05–2%) on the measured properties has also been evaluated. Pristine WS2/EG nanofluids exhibit low zeta potential values, i.e., −7.9 mV, −9.3 mV, and −5 mV, corresponding to 0.005%, 0.01%, and 0.02% nanofluid, respectively. However, the zeta potential surpassed the threshold (±30 mV) and the maximum values reached of −52 mV, −45 mV, and 42 mV for SDS, SDBS, and CTAB-containing nanofluids. This showed the successful adsorption of surfactants onto WS2, which was also observed through the increased agglomerate size of up to 1720 nm. Concurrently, particularly for 0.05% SDS with 0.005% WS2, thermal conductivity was enhanced by up to 4.5%, with a corresponding decrease in viscosity of up to 10.5% in a temperature range of (25–70 °C), as compared to EG. Conversely, the viscoelastic analysis has indicated considerable yield stress due to the presence of surfactants, while the pristine nanofluids exhibited enhanced fluidity over the entire tested deformation range. The shear flow behavior showed a transition from a non-Newtonian to a Newtonian fluid at a low shear rate of 10 s−1. Besides this, the temperature sweep analysis has shown a viscosity reduction in a range of temperatures (25–70 °C), with an indication of a critical temperature limit. However, owing to an anomalous reduction in the dynamic viscosity of up to 10.5% and an enhancement in the thermal conductivity of up to 6.9%, WS2/EG nanofluids could be considered as a potential candidate for heat transfer applications.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

et al. 2020

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“…Glucose and Fe(NO 3 ) 3 were used as the C and Fe sources, respectively. SLS acts as an anionic surfactant, and the long‐chain hydrophobic group can act on the surface of the nanoparticles, leading to a highly dispersed state of the nanoparticles in the solution . After vigorous stirring, the mixed solution was then transferred into a Teflon‐lined stainless steel autoclave and subjected to a hydrothermal reaction.…”

Section: Resultsmentioning

confidence: 99%

“…SLS acts as an anionic surfactant, and the long-chain hydrophobic group can act on the surface of the nanoparticles, leading to a highly dispersed state of the nanoparticles in the solution. 43,44 After vigorous stirring, the mixed solution was then transferred into a Teflon-lined stainless steel autoclave and subjected to a hydrothermal reaction. During the process of glucose carbonization, the glucose polymer layer can be formed around the carbon black and Fe.…”

Section: Resultsmentioning

confidence: 99%

Iron and nitrogen codoped carbon catalyst with excellent stability and methanol tolerance for oxygen reduction reaction

Liu

et al. 2019

Int J Energy Res

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Summary A series of non‐precious metal FexNC electrocatalysts for oxygen reduction reaction (ORR) were successfully synthesized using Fe(NO3)3, glucose, and melamine as the Fe, C, and N sources, respectively. The effects of the pyrolysis temperature and Fe/N contents on the catalytic performances are comprehensively investigated. Electrochemical results reveal that among the FexNC catalysts, Fe1.5NC‐900‐2 pyrolyzed at 900°C with the mass ratio of FeC to melamine being 1:10 proves the highest catalytic performance. The half‐wave potential (E1/2) of ORR was 821 mV (vs reversible hydrogen electrode (RHE)) and only 36 mV lower than that on commercial Pt/C catalyst (857 mV). More importantly, Fe1.5NC‐900‐2 catalyst shows excellent stability and methanol tolerance. After 1000 sequential cycles, the E1/2 on Pt/C catalyst shifts negatively by approximately 60 mV, while for Fe1.5NC‐900‐2 catalyst, this shift is only 28 mV although the number of sequential cycles is increased to 8000. In the presence of methanol, the current decay in the chronoamperometric response at 1000 seconds is only 8% and also much lower than that on Pt/C catalyst (46%). The high catalytic performances arise from the abundant Fe3N active sites embedded in the carbon matrix of the FexNC catalysts. These findings can be used to discuss the catalytic mechanism of ORR on the FexNC catalysts and design the nonprecious metal carbon‐based electrocatalysts for ORR.

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Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

et al. 2020

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Summary In this study, polyaniline (PANI) nanocomposite‐based nanofluids (NFs) in ethylene glycol were obtained with a two‐step method by varying volume concentrations from 0.005% to 0.02%. Tungsten disulphide (WS2) nanoparticles were doped in PANI having different weight percentage (1%, 2% and 5%) via oxidative in situ polymerization employing ammonium persulphate oxidant in an acidic environment. The nanocomposites were comprehensively characterised using various techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy and high‐resolution transmission electron microscopy. The formulated NFs were extensively investigated with zeta‐sizer, particle size analyzer, thermal property analyzer and rheometer in a temperature range of 25°C to 70°C. The zeta potential results (up to 54.5 mV) were evident of extraordinary stability of NFs at all targeted temperatures along with polydispersity index <30% and mean particle/agglomerate size in the range of 335.8 to 489 nm. Additionally, a remarkable thermal conductivity improvement (~20.7%) was achieved with intrinsic PANI‐based NFs at an operating temperature of 50°C. Subsequently, it varied substantially with WS2 doping within PANI matrix and reached to 117.9%. Furthermore, the rheological measurements have revealed the viscoelastic nature of NFs along with a remarkable reduction in apparent viscosity (up to 8.4%). The temperature sweep viscosity indicated the transition of relative viscosity from high to low at a critical temperature of about 55°C. The NF10 (WS2 + PANI 5, at 0.005 vol%) was found to be the best candidate with 63.8% thermal conductivity enhancement and 6.4% viscosity reduction as compared with the base fluid at an operating temperature of 50°C. Thus, WS2 doping within PANI has proved to be crucial in the proliferation of thermal conductivity and mitigation of viscosity.

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The synergistic effect between surfactant and nanoparticle on the viscosity of water-based fluids

Cited by 23 publications

References 20 publications

Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability, Thermal Conductivity, and Rheological Properties

Iron and nitrogen codoped carbon catalyst with excellent stability and methanol tolerance for oxygen reduction reaction

Thermal conductivity, rheology and stability analysis of 2D tungsten disulphide‐doped polyaniline‐based nanofluids: An experimental investigation

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