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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 experimental setup of evaporation experiment; (b) Evaporation weight change of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA as a function of time under Xenon lamp with power density of ~3.2 kW/m2; (c) Contact angle measurements of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA during water evaporation process. Right side shows the optical images of water droplets on different surfaces. ((a) was drawn by Chengyi Song).
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f2: (a) Schematic of experimental setup of evaporation experiment; (b) Evaporation weight change of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA as a function of time under Xenon lamp with power density of ~3.2 kW/m2; (c) Contact angle measurements of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA during water evaporation process. Right side shows the optical images of water droplets on different surfaces. ((a) was drawn by Chengyi Song).

Mentions: Figure 2a illustrates the experimental setup of evaporation performance. A 10-mL beaker full of water (NANOpure, Millipore Water Purification System; 18.2 MΩ) was placed on a 4 decimal electronic precision analytical balance (FR124CN, Ohaus Instrument, Shanghai), which can record the weight change of evaporation system at intervals of 5 seconds. A piece of AANF, with the similar diameter of the beaker, was floating on the surface of water. When a Xenon lamp (JYANG HID 922, Ju Jing Yang Electronics Co., Ltd.) with the power density of ~3.2 kW/m2 was set up to illuminate vertically upon the floating AANF, the generated heat would be localized within AANF79. To obtain the evaporation rate of AANF with different surface chemistry modification, we carefully examined the weight change of water and listed the following observations on the basis of Fig. 2b: 1) the use of either HLA or HBA resulted in almost the same water evaporation speed; 2) all the AANFs achieved higher evaporation rates than HLA or HBA alone due to the induced plasmonic heating; 3) varying wettability of AuNP film does not affect the evaporation rate of AANFs; 4) when HLA and HBA were coupled with AuNP film, the difference in evaporation rate between HLA and HBA emerges (i.e. the evaporation rate of HLN-HLA or HBN-HLA exhibits the highest evaporation rate (0.180 mg/s), which is ~1.23 times of that of HLN-HBA or HBN-HBA). To further verify the role of wettability during evaporation, we also carried out measurements of surface contact angle (Fig. 2c). A high-speed camera (X-Stream XS-4, IDT, US) recorded the process of dropping 2-μL water droplet on the AuNP film by a pipette. The contact angles were obtained through the analysis of the recorded optical images before, during and after the evaporation processes. Figure 2c shows that the contact angles of all six samples were relatively constant, implying that chemical modification was stable during water evaporation.


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 experimental setup of evaporation experiment; (b) Evaporation weight change of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA as a function of time under Xenon lamp with power density of ~3.2 kW/m2; (c) Contact angle measurements of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA during water evaporation process. Right side shows the optical images of water droplets on different surfaces. ((a) was drawn by Chengyi Song).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: (a) Schematic of experimental setup of evaporation experiment; (b) Evaporation weight change of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA as a function of time under Xenon lamp with power density of ~3.2 kW/m2; (c) Contact angle measurements of HLN-HLA, HBN-HLA, HLN-HBA, HBN-HBA, HLA and HBA during water evaporation process. Right side shows the optical images of water droplets on different surfaces. ((a) was drawn by Chengyi Song).
Mentions: Figure 2a illustrates the experimental setup of evaporation performance. A 10-mL beaker full of water (NANOpure, Millipore Water Purification System; 18.2 MΩ) was placed on a 4 decimal electronic precision analytical balance (FR124CN, Ohaus Instrument, Shanghai), which can record the weight change of evaporation system at intervals of 5 seconds. A piece of AANF, with the similar diameter of the beaker, was floating on the surface of water. When a Xenon lamp (JYANG HID 922, Ju Jing Yang Electronics Co., Ltd.) with the power density of ~3.2 kW/m2 was set up to illuminate vertically upon the floating AANF, the generated heat would be localized within AANF79. To obtain the evaporation rate of AANF with different surface chemistry modification, we carefully examined the weight change of water and listed the following observations on the basis of Fig. 2b: 1) the use of either HLA or HBA resulted in almost the same water evaporation speed; 2) all the AANFs achieved higher evaporation rates than HLA or HBA alone due to the induced plasmonic heating; 3) varying wettability of AuNP film does not affect the evaporation rate of AANFs; 4) when HLA and HBA were coupled with AuNP film, the difference in evaporation rate between HLA and HBA emerges (i.e. the evaporation rate of HLN-HLA or HBN-HLA exhibits the highest evaporation rate (0.180 mg/s), which is ~1.23 times of that of HLN-HBA or HBN-HBA). To further verify the role of wettability during evaporation, we also carried out measurements of surface contact angle (Fig. 2c). A high-speed camera (X-Stream XS-4, IDT, US) recorded the process of dropping 2-μL water droplet on the AuNP film by a pipette. The contact angles were obtained through the analysis of the recorded optical images before, during and after the evaporation processes. Figure 2c shows that the contact angles of all six samples were relatively constant, implying that chemical modification was stable during water evaporation.

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