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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

SEM images of the AAO membrane from (a) top view, (b) back view and (c) side view with different magnification.(d) Schematics of evaporation process of HLA, HBA and AANFs under weak (~3.2 kW/m2) or strong (~14.3 kW/m2) light illumination (not drawn to scale). ((d) was drawn by Chengyi Song).
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f6: SEM images of the AAO membrane from (a) top view, (b) back view and (c) side view with different magnification.(d) Schematics of evaporation process of HLA, HBA and AANFs under weak (~3.2 kW/m2) or strong (~14.3 kW/m2) light illumination (not drawn to scale). ((d) was drawn by Chengyi Song).

Mentions: To help understand the AANF evaporation performance, we further examined the morphologies of nano-porous AAO membranes by SEM and proposed an evaporation mechanism of AAO-based film in Fig. 6. Figure 6a,b show top and back view of AAO membrane, respectively. A typical cross-sectional SEM view (Fig. 6c) of the AAO membrane shows the non-intercrossing, cylindrical branched nano-channels of AAO membrane. Along the direction perpendicular to the surface, there are small parallel branches that connect the large and small nano-channels. As shown in Fig. 6d, AAOs are placed on the surface of water during evaporation process. Capillary force leverages water from bottom to the top of nano-channels within HLA while water remains at the bottom of HBA due to the water repelling nature of the hydrophobic surface. The top evaporation areas of HLA and HBA, however, are almost the same, which is consistent with our observations that HLA and HBA exhibited similar evaporation rate during the light-driven evaporation process (Figs 2b and 3a).


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)

SEM images of the AAO membrane from (a) top view, (b) back view and (c) side view with different magnification.(d) Schematics of evaporation process of HLA, HBA and AANFs under weak (~3.2 kW/m2) or strong (~14.3 kW/m2) light illumination (not drawn to scale). ((d) was drawn by Chengyi Song).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: SEM images of the AAO membrane from (a) top view, (b) back view and (c) side view with different magnification.(d) Schematics of evaporation process of HLA, HBA and AANFs under weak (~3.2 kW/m2) or strong (~14.3 kW/m2) light illumination (not drawn to scale). ((d) was drawn by Chengyi Song).
Mentions: To help understand the AANF evaporation performance, we further examined the morphologies of nano-porous AAO membranes by SEM and proposed an evaporation mechanism of AAO-based film in Fig. 6. Figure 6a,b show top and back view of AAO membrane, respectively. A typical cross-sectional SEM view (Fig. 6c) of the AAO membrane shows the non-intercrossing, cylindrical branched nano-channels of AAO membrane. Along the direction perpendicular to the surface, there are small parallel branches that connect the large and small nano-channels. As shown in Fig. 6d, AAOs are placed on the surface of water during evaporation process. Capillary force leverages water from bottom to the top of nano-channels within HLA while water remains at the bottom of HBA due to the water repelling nature of the hydrophobic surface. The top evaporation areas of HLA and HBA, however, are almost the same, which is consistent with our observations that HLA and HBA exhibited similar evaporation rate during the light-driven evaporation process (Figs 2b and 3a).

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