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The impact of surface chemistry on the performance of localized solar-driven evaporation system.

Yu S, Zhang Y, Duan H, Liu Y, Quan X, Tao P, Shang W, Wu J, Song C, Deng T - Sci Rep (2015)

Bottom Line: Such newly developed evaporation system is composed of top plasmonic light-to-heat conversion layer and bottom porous supporting layer.Additionally, this work demonstrated that the evaporation rate mainly depends on the wettability of bottom supporting layer rather than that of top light-to-heat conversion layer.The findings in this study not only elucidate the role of surface chemistry of each layer of such double-layered evaporation system, but also provide additional design guidelines for such localized evaporation system in applications including desalination, distillation and power generation.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R. China.

ABSTRACT
This report investigates the influence of surface chemistry (or wettability) on the evaporation performance of free-standing double-layered thin film on the surface of water. Such newly developed evaporation system is composed of top plasmonic light-to-heat conversion layer and bottom porous supporting layer. Under solar light illumination, the induced plasmonic heat will be localized within the film. By modulating the wettability of such evaporation system through the control of surface chemistry, the evaporation rates are differentiated between hydrophilized and hydrophobized anodic aluminum oxide membrane-based double layered thin films. Additionally, this work demonstrated that the evaporation rate mainly depends on the wettability of bottom supporting layer rather than that of top light-to-heat conversion layer. The findings in this study not only elucidate the role of surface chemistry of each layer of such double-layered evaporation system, but also provide additional design guidelines for such localized evaporation system in applications including desalination, distillation and power generation.

No MeSH data available.


Related in: MedlinePlus

Evaporation rates of HBN-HLA and HBN-HBA illuminated under different power density of ~3.2 kW/m2 (a) and ~14.3 kW/m2 (b).The calculations of the difference between relative evaporation rate (ΔRr) are shown under the plots.
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f4: Evaporation rates of HBN-HLA and HBN-HBA illuminated under different power density of ~3.2 kW/m2 (a) and ~14.3 kW/m2 (b).The calculations of the difference between relative evaporation rate (ΔRr) are shown under the plots.

Mentions: where RAANF(L) and RAANF(B) are the evaporation rates of hydrophilic and hydrophobic AAO-based AANFs, respectively; RHLA and RHBA are the evaporation rates of hydrophilic and hydrophobic AAO membrane, respectively; and are the relative evaporation rate ratio of hydrophilic AAO-based AANF to hydrophilic AAO and hydrophobic AAO-based AANF to hydrophobic AAO, respectively; ΔRr is the difference between relative evaporation rates. The calculated ΔRr under different incident light intensity is shown in Fig. 4 (ΔRr = 0.39, intensity = ~3.2 kW/m2; ΔRr = 2.23, intensity = ~14.3 kW/m2), which shows that plasmonic nanoparticle film can differentiate the evaporation rates of hydrophilic and hydrophobic AAO during solar light driven evaporation and the difference can be amplified when the incident light intensity increases. Due to the relatively large fluctuation in evaporation during the first minute as the evaporation stabilizes, only evaporation rates between 1 and 12 minutes are shown in Fig. 4.


The impact of surface chemistry on the performance of localized solar-driven evaporation system.

Yu S, Zhang Y, Duan H, Liu Y, Quan X, Tao P, Shang W, Wu J, Song C, Deng T - Sci Rep (2015)

Evaporation rates of HBN-HLA and HBN-HBA illuminated under different power density of ~3.2 kW/m2 (a) and ~14.3 kW/m2 (b).The calculations of the difference between relative evaporation rate (ΔRr) are shown under the plots.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559801&req=5

f4: Evaporation rates of HBN-HLA and HBN-HBA illuminated under different power density of ~3.2 kW/m2 (a) and ~14.3 kW/m2 (b).The calculations of the difference between relative evaporation rate (ΔRr) are shown under the plots.
Mentions: where RAANF(L) and RAANF(B) are the evaporation rates of hydrophilic and hydrophobic AAO-based AANFs, respectively; RHLA and RHBA are the evaporation rates of hydrophilic and hydrophobic AAO membrane, respectively; and are the relative evaporation rate ratio of hydrophilic AAO-based AANF to hydrophilic AAO and hydrophobic AAO-based AANF to hydrophobic AAO, respectively; ΔRr is the difference between relative evaporation rates. The calculated ΔRr under different incident light intensity is shown in Fig. 4 (ΔRr = 0.39, intensity = ~3.2 kW/m2; ΔRr = 2.23, intensity = ~14.3 kW/m2), which shows that plasmonic nanoparticle film can differentiate the evaporation rates of hydrophilic and hydrophobic AAO during solar light driven evaporation and the difference can be amplified when the incident light intensity increases. Due to the relatively large fluctuation in evaporation during the first minute as the evaporation stabilizes, only evaporation rates between 1 and 12 minutes are shown in Fig. 4.

Bottom Line: Such newly developed evaporation system is composed of top plasmonic light-to-heat conversion layer and bottom porous supporting layer.Additionally, this work demonstrated that the evaporation rate mainly depends on the wettability of bottom supporting layer rather than that of top light-to-heat conversion layer.The findings in this study not only elucidate the role of surface chemistry of each layer of such double-layered evaporation system, but also provide additional design guidelines for such localized evaporation system in applications including desalination, distillation and power generation.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R. China.

ABSTRACT
This report investigates the influence of surface chemistry (or wettability) on the evaporation performance of free-standing double-layered thin film on the surface of water. Such newly developed evaporation system is composed of top plasmonic light-to-heat conversion layer and bottom porous supporting layer. Under solar light illumination, the induced plasmonic heat will be localized within the film. By modulating the wettability of such evaporation system through the control of surface chemistry, the evaporation rates are differentiated between hydrophilized and hydrophobized anodic aluminum oxide membrane-based double layered thin films. Additionally, this work demonstrated that the evaporation rate mainly depends on the wettability of bottom supporting layer rather than that of top light-to-heat conversion layer. The findings in this study not only elucidate the role of surface chemistry of each layer of such double-layered evaporation system, but also provide additional design guidelines for such localized evaporation system in applications including desalination, distillation and power generation.

No MeSH data available.


Related in: MedlinePlus