Experimental investigation on rheological properties of water based nanofluids with low MWCNT concentrations

Yu, Long; Bian, Yongning; Liu, Yang; Xü, Xinsheng

doi:10.1016/j.ijheatmasstransfer.2019.01.120

Cited by 37 publications

(27 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Newtonian liquid to the shear thinning behavior by increasing MWCNT concentrations has been previously described in the literature [33,34]. As a general comment on the rheological properties, it can be stated that the viscosity of the MWCNT ink is not substantially altered by the addition of certain quantities of the acrylic Hycar ® .…”

Section: Resultsmentioning

confidence: 79%

“…However, diluted inks such as MSH-2, which contained 4 mg·mL −1 of MWCNTs and increasing quantities of the Hycar ® acrylic resin, approached a Newtonian regime at shear rates above 25 s −1 . The change from a nearly Newtonian liquid to the shear thinning behavior by increasing MWCNT concentrations has been previously described in the literature [ 33 , 34 ]. As a general comment on the rheological properties, it can be stated that the viscosity of the MWCNT ink is not substantially altered by the addition of certain quantities of the acrylic Hycar ® .…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

et al. 2020

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) processed into conductive films by liquid phase deposition technologies reveal increasing interest as electrode components in electrochemical device platforms for sensing and energy storage applications. In this work we show that the addition of acrylic latex to water-based CNT inks not only favors the fabrication of stable and robust flexible electrodes on plastic substrates but, moreover, sensitively enables the control of their electrical and electrochemical transport properties. Importantly, within a given concentration range, the acrylic additive in the films, being used as working electrodes, effectively blocks undesired faradaic transfer reactions across the electrode–electrolyte interface while maintaining their capacitance response as probed in a three-electrode electrochemical device configuration. Our results suggest a valuable strategy to enhance the chemical stability of CNT film electrodes and to suppress non-specific parasitic electrochemical reactions of relevance to electroanalytical and energy storage applications.

show abstract

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 97%

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Rheological measurements of the prepared WS 2 /EG nanofluids were carried out with the MCR series rheometer (Model 302-SN82171186, Anton Paar Asia Pacific Laboratory, Kuala Lumpur, Malaysia). The double-gap measuring geometry (DG 26.7-SN39066) with a 1 mm gap was chosen to test the low viscosity samples [ 31 ]. The small gaps between the concentric cylinders allow measurements with sample volumes as small as 3 mL.…”

Section: Methodsmentioning

confidence: 99%

“…The maximum error was computed at ~5% in a temperature range of 10–70 °C, with ~4% relative standard deviation. Nevertheless, Yu et al have already revealed the maximum errors to be ~3% and ~5% in rotational and oscillation measurements, respectively, for DG (double gap) measuring geometry [ 31 ]. To minimize the pre-shear history effects, samples were placed static inside the holder at constant temperature for 10 min.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

“…In order to study the effects of ultrasonication on the stability and rheological properties of the NF, different ultrasonication times of 10, 20, 40, 60, 70, 75, and 80 min were applied. The effectiveness of the ultrasonication process has been proven in the literature [39][40][41][42] . However, optimum ultrasonication time is still challenging.…”

Section: Sample Preparationmentioning

confidence: 99%

Effects of ultrasonication time on stability, dynamic viscosity, and pumping power management of MWCNT-water nanofluid: an experimental study

Asadi

Alarifi

2020

Sci Rep

View full text Add to dashboard Cite

It is known that ultrasonication has a certain effect on thermophysical properties and heat transfer of nanofluids. The present study is the continuation of the authors’ previous research on the effects of ultrasonication on the thermophysical properties of Multi-Walled Carbon Nanotubes (MWCNTs)-water nanofluid. Investigating the effects of ultrasonication time on samples’ stability, rheological properties, and pumping power of a water-based nanofluid containing MWCNTs nanoparticle is the main objective of the present study. The two-step method has been employed to prepared the samples. Moreover, a probe-type ultrasonic device has been used, and different ultrasonication times have been applied. The samples’ stability is investigated in different periods. The results revealed that prolonging the ultrasonication time to 60 min leads to improving the samples’ stability while prolonging ultrasonication time to higher than 60 min resulted in deteriorating the stability. As for dynamic viscosity, it is observed that increasing ultrasonication time to 60 min leads to decreasing the dynamic viscosity of the samples. As for pumping power, it is observed that the maximum increase in fanning friction factor ratio is less than 3%, which shows that adding MWCNTs to water does not impose a considerable penalty in the required energy for pumping power.

show abstract

Experimental investigation on rheological properties of water based nanofluids with low MWCNT concentrations

Cited by 37 publications

References 45 publications

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

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

Effects of ultrasonication time on stability, dynamic viscosity, and pumping power management of MWCNT-water nanofluid: an experimental study

Contact Info

Product

Resources

About