Modified Two-Step Method to Prepare Long-Term Stable CNT Nanofluids for Heat Transfer Applications

Sharma, Babita; Sharma, S. K.; Gupta, Shipra Mital; Kumar, Arinjay

doi:10.1007/s13369-018-3345-5

Cited by 25 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This leads to modification on the surface of MWCNT and behaves in hydrophilic nature. The effects of the surfactant enhance the repulsive forces between the MWCNT particles to avoid the agglomerates and remain stable 29 . The stability of MWCNT was measured through the photographic method and was stable for more than a month.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation on a solar parabolic collector using water-based multi-walled carbon-nanotube with low volume concentrations

Talugeri

Pattana

Nasi

et al. 2023

Sci Rep

View full text Add to dashboard Cite

A limited experimental work was on multi-walled carbon nanotube (MWCNT)—water nanofluid with surfactant in the solar parabolic collector at low volume concentrations. At high-volume concentrated nanofluid, the pressure drop was more due to an increase in the viscosity of the working fluid and an increase in the nanoparticle cost; hence it is not economical. This report attempted to use Sodium Dodecyl Benzene Sulfonate (SDBS) surfactant in the low-volume concentrated MWCNT-water nanofluid to establish effective heat transfer in solar parabolic collector applications. The stable MWCNT-water nanofluid was prepared at 0.0158, 0.0238, and 0.0317 volume concentrations. The experiments were conducted from 10:00 to 16:00 at 6, 6.5 and 7 L/min flow rates concerning ASHRAE Standards. At the 7 L/min flow rate of the working fluid, having a minimum temperature difference between the working fluid and absorber tube leads to better heat transfer. The increased volume concentration of MWCNT in the water enhances the surface area interaction between water and MWCNT nanoparticles. This results in maximum solar parabolic collector efficiency at 0.0317 vol% with a 7 L/min flow rate and 10–11% higher than the distilled water.

show abstract

Section: Resultsmentioning

confidence: 99%

Experimental investigation on a solar parabolic collector using water-based multi-walled carbon-nanotube with low volume concentrations

Talugeri

Pattana

Nasi

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For stability investigation, UV spectrophotometer (U‐2190, HITACHI) is used to measure the absorbance of prepared Nanofluid at 800 nm. According to a report, measured absorbance at 800 nm is because of only CNT [38,43,58] . Zeta size analyzer NanoZS (Malvern Instruments, UK) was utilized to record zeta potential and estimate the stability of prepared Nanofluid.…”

Section: Methodsmentioning

confidence: 99%

“…According to a report, measured absorbance at 800 nm is because of only CNT. [38,43,58] Zeta size analyzer NanoZS (Malvern Instruments, UK) was utilized to record zeta potential and estimate the stability of prepared Nanofluid. Hydrodynamic…”

Section: Nanofluid Characterizationmentioning

confidence: 99%

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Gupta

Sharma

2023

ChemistrySelect

Self Cite

View full text Add to dashboard Cite

In recent years, numerous investigations have been carried out in heat transfer applications for CNT nanofluid as it possesses a high thermal conductivity compared to conventional fluids. Hydrophobicity of CNT poses a challenge to disperse CNT in polar basefluid. Surfactants can solve this issue up to a certain extent only but have some associated disadvantages such as foam formation, stickiness and viscosity enhancement responsible for an increase in power required to pump Nanofluid in heat transfer devices. This work presents preparation of a hybrid nanofluid as an alternative. Cu−CNT hybrid nanoparticles were generated in this research using in‐situ preparation of Cu nanoparticles in the presence of CNT and dispersion in double distilled water without addition of surfactant to produce a stable nanofluid. FESEM with EDX confirms copper nanoparticles present on outer surface of MWCNT and Raman spectroscopy confirmed the covalent functionalization. Spectral analysis, Zeta potential, and DLS were used to evaluate the dispersibility of Cu−CNT hybrid nanofluid. The results showed that the samples were extremely stable, with maximum stability of about 168 days. XRD pattern of Cu−CNT hybrid nanoparticles confirmed the existence of Cu and CNT. Nanofluid demonstrated a minor increase in density and viscosity compared to basefluid water due to addition of nanoparticles. An increase in thermal conductivity was also observed, which is critical for heat transfer applications.

show abstract

“…It is essential to investigate the inuence of different dispersants on the dispersion of carbon nanotubes in water because physical properties of nanocomposites are directly dependent on their dispersion morphology. [31][32][33] The dispersion morphologies of commercial SWCNTs, P-SWCNTs and PA-SWCNTs in water are checked by TEM, as shown in Fig. 7.…”

Section: Dispersion Morphologymentioning

confidence: 99%

“…15,16 Besides, many researchers have vigorously adopted non-covalent strategies to disperse carbon nanotubes into the aqueous system, generally with the assistance of surfactants, biomolecules, aromatic compounds, natural macromolecules, and polymers onto the CNTs surface by using van der Waals forces or p-p stacking interactions. [17][18][19][20][21][22][23] Because this strategy avoids complicated chemical reactions under strongly acidic conditions and preserves the conjugated structure and inherent properties of commercial SWCNTs, it has been considered to be an easy, green modication method. However, the long-term stability of carbon nanotubes dispersion with highly homogeneous dispersibility is generally worse than that of chemical modied dispersion.…”

Section: Introductionmentioning

confidence: 99%

Highly homogeneous and stable single-walled carbon nanotubes dispersion modified by polyvinylpyrrolidone and alkanolamine in water

Li,

Yu,

Fang

et al. 2024

RSC Adv.

View full text Add to dashboard Cite

show abstract

Modified Two-Step Method to Prepare Long-Term Stable CNT Nanofluids for Heat Transfer Applications

Cited by 25 publications

References 37 publications

Experimental investigation on a solar parabolic collector using water-based multi-walled carbon-nanotube with low volume concentrations

Experimental investigation on a solar parabolic collector using water-based multi-walled carbon-nanotube with low volume concentrations

Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties

Highly homogeneous and stable single-walled carbon nanotubes dispersion modified by polyvinylpyrrolidone and alkanolamine in water

Contact Info

Product

Resources

About