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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

(a) Schematic of AuNP films sitting on the AAO membrane modified with different alkyl chains (C4, C8, C12, C16); (b) Evaporation weight change of AANF as a function of time. ((a) was drawn by Chengyi Song).
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f5: (a) Schematic of AuNP films sitting on the AAO membrane modified with different alkyl chains (C4, C8, C12, C16); (b) Evaporation weight change of AANF as a function of time. ((a) was drawn by Chengyi Song).

Mentions: With the flexibility of controlling the chain length of alkyl thiols, we also tailored the organic tether group attached to the AuNP film surface by using thiols with different carbon chain lengths and studied the evaporation performance of HBN-HLA. Different thiols could potentially change the optical absorption performance of the AuNPs and resulted in the difference in heat localization and evaporation27. Thiols with 4, 8, 12, 16 carbon atoms in the straight aliphatic chain were attached to the top AuNP layer using the same experimental procedure. Figure 5 shows that the evaporation performances of these systems are almost the same, indicating the alkyl chain length does not affect evaporation rate.


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)

(a) Schematic of AuNP films sitting on the AAO membrane modified with different alkyl chains (C4, C8, C12, C16); (b) Evaporation weight change of AANF as a function of time. ((a) was drawn by Chengyi Song).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: (a) Schematic of AuNP films sitting on the AAO membrane modified with different alkyl chains (C4, C8, C12, C16); (b) Evaporation weight change of AANF as a function of time. ((a) was drawn by Chengyi Song).
Mentions: With the flexibility of controlling the chain length of alkyl thiols, we also tailored the organic tether group attached to the AuNP film surface by using thiols with different carbon chain lengths and studied the evaporation performance of HBN-HLA. Different thiols could potentially change the optical absorption performance of the AuNPs and resulted in the difference in heat localization and evaporation27. Thiols with 4, 8, 12, 16 carbon atoms in the straight aliphatic chain were attached to the top AuNP layer using the same experimental procedure. Figure 5 shows that the evaporation performances of these systems are almost the same, indicating the alkyl chain length does not affect evaporation rate.

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