Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Dong, Lan; Ding, Suying; Wu, Zhixiong; Xie, Huaqing; Wang, Jiawei; Wang, Tingting; Wang, Yuanyuan; Huang, Yueming

doi:10.1002/ente.202200661

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…Figure 6b demonstrates that the temperature rapidly increased under the solarsimulated radiation and then progressively reached a steady state due to the increasing importance of heat dissipation as the temperature differences between the INF and the surrounding environment increased. 92 Finally, the temperature dropped quickly to room temperature after the light irradiation source was turned off. The observed behavior can be explained as follows.…”

Section: Chemistry Of Materialsmentioning

confidence: 99%

A Glance at Novel Ionanofluids Incorporating Silk-Derived Carbon Dots

Duarte,

Pereira,

Medronho

et al. 2024

Chem. Mater.

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One of the hallmarks of the current efforts in the field of thermal energy is heat transfer enhancement. Ionanofluids (INFs), a combination of nanomaterials and ionic liquids (ILs), are an appealing category of thermal fluids. In this work, we introduce sustainable INFs composed of carbon dots derived from Bombyx mori silk fibroin (SF) dispersed in a mixture of 1-butyl-3methylimidazolium chloride (IL 1 ) and 1-(4-sulfobutyl)-3-methylimidazolium triflate (IL 2 ). The syntheses were performed at mild conditions, with reaction times of 3, 4, and 5 h, and without purification steps. The INFs display room-temperature emission in the visible spectral range with quantum yield values up to 0.09 and are essentially viscous fluids (G″ > G′). A marked shear thinning behavior is observed at high shear rates, particularly for the systems SFIL 1 IL 2 -3h and SFIL 1 IL 2 -4h. The INFs demonstrate relatively high heat capacity and thermal conductivity values in comparison to state-of-the-art INFs. Under suitable illumination conditions, the INFs can convert light into heat in an efficient manner, with photothermal conversion efficiencies of up to 28%, similar to other reported INFs. SFIL 1 IL 2 -5h exhibits remarkable stability over time within the range of working temperatures. This work paves the way for the development of new thermal fluids for enhanced heat transfer technologies using sustainable synthesis routes and natural raw precursor materials.

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Section: Chemistry Of Materialsmentioning

confidence: 99%

A Glance at Novel Ionanofluids Incorporating Silk-Derived Carbon Dots

Duarte,

Pereira,

Medronho

et al. 2024

Chem. Mater.

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“…[5][6][7] In recent years, there has been a considerable effort to explore the impact of incorporating multi-walled carbon nanotubes (MWCNTs) into ZnO nanoparticles (ZnO NPs) on their optical properties. 8,9 These studies have provided valuable insights into the underlying mechanisms responsible for changes in the optical properties of the nanoparticles, including enhanced light absorption and scattering, increased surface area, and improved charge carrier transport. The observed improvements have demonstrated the potential of MWCNT-incorporated ZnO NPs in various applications, including sensors, light emitting diodes, solar cells, and photocatalysis.…”

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confidence: 99%

Tailoring Optoelectronic Properties of ZnO Nanoparticles via Incorporation of Multiwalled Carbon Nanotube Contents on of ZnO/MWCNT Nanocomposites

Al-Asbahi

2023

ECS J. Solid State Sci. Technol.

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The present study demonstrates the tailoring of optoelectronic properties of ZnO nanoparticles (NPs) by adding multi-walled carbon nanotubes (MWCNTs) at different weight ratios. ZnO/MWCNT nanocomposites were successfully prepared using the solution blending method, and the optical spectra of all samples were determined using a UV–vis spectrometer. An increase in the optical absorption coefficient (α) and extinction coefficient (k) was observed with an increase in MWCNT content, resulting in the significant ability to attenuate incident light in ZnO/MWCNT nanocomposites compared to pure ZnO NPs. The optical band gap of pure ZnO NPs decreased from 3.26 eV to 2.58 eV in the ZnO/50 wt% MWCNT nanocomposite. The refractive index values ranged from 1.66 to 1.61 as the wavelength varied between 400 nm and 700 nm. Furthermore, the incorporation of MWCNTs in the ZnO/MWCNT nanocomposite had an impact on various dispersion parameters related to the refractive index. With increasing MWCNT content, the dielectric constant (ε 0) decreased from 2.40 to 1.96, while the mean oscillator wavelength (λ 0) increased from 157.7 nm to 164.2 nm and the oscillator strength (S0) decreased from 5.93 × 10−5 nm−2 to 3.70 × 10−6 nm−2. The localized density of state (N/m*) increased from 7.45 × 1057 to 20.8 × 1057 (m3 Kg) −1, and the long wavelength refractive index (ε ∞) rose from 3.683 to 4.745. Moreover, the plasma frequency (ω p) of the electron exhibited an increase from 2.15 × 1031 to 6.01 × 1031 Hz. These findings highlight the potential of tailoring the optoelectronic properties of ZnO NPs through the incorporation of MWCNTs, paving the way for the development of novel materials with improved optoelectronic characteristics for a wide range of applications.

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Fluorine-Free and Robust Photothermal Superhydrophobic Coating Based on Biochar for Anti-/De-Icing

Lei,

Hu,

et al. 2024

Coatings

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Environmental pollution can be caused by the improper disposal of agricultural waste and the use of fluorinated chemicals. Icing is a natural phenomenon, but the accumulation of ice on the surface of electrical equipment can damage the equipment and reduce power generation efficiency. Preparation of biochar anti-icing coatings with a fluorine-free process promotes resource utilization and environmental protection. In this study, superhydrophobic coatings with photothermal effect prepared based on biochar as a filler, which was blended with multi-walled carbon nanotubes (MWCNTs) and polyurea adhesive. The coating exhibits remarkable durability, as well as anti-icing, antifrosting, and self-cleaning characteristics. Utilizing fluorine-free chemicals enhances the environmentally friendly nature of the coating. The coating exhibits a contact angle of 155°, and the temperature can increase to 47.6 °C within a duration of 10 min. It can complete ice detachment in 128 s and defrosting in 210 s. The coating demonstrated exceptional durability when exposed to mechanical abrasion using sandpaper and steel brushes, water jet impact, acid and alkali corrosion, and tape-peeling tests. This study streamlines the procedure for creating photothermal superhydrophobic coatings, which contributes to environmental conservation and sustainable development. Additionally, it broadens the possibilities for recycling and reusing rejected crops.

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Photothermal Conversion Characteristics of ZnO/MWCNTs Binary Nanofluids and ZnO/MWCNTs/Au Ternary Hybrid Nanofluids in Direct Absorption Solar Collectors

Cited by 3 publications

References 45 publications

A Glance at Novel Ionanofluids Incorporating Silk-Derived Carbon Dots

A Glance at Novel Ionanofluids Incorporating Silk-Derived Carbon Dots

Tailoring Optoelectronic Properties of ZnO Nanoparticles via Incorporation of Multiwalled Carbon Nanotube Contents on of ZnO/MWCNT Nanocomposites

Fluorine-Free and Robust Photothermal Superhydrophobic Coating Based on Biochar for Anti-/De-Icing

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