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Enhancing Localized Evaporation through Separated Light Absorbing Centers and Scattering Centers.

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

Bottom Line: Evaporation has been considered as one of the most important phase-change processes in modern industries.Different concentrations of both the light absorbing centers and the light scattering centers were evaluated and the evaporation performance can be largely enhanced with the balance between absorbing centers and scattering centers.The findings in this study not only provide a new way to improve evaporation efficiency in plasmonic particle-based solution, but also shed lights on the design of new solar-driven localized evaporation systems.

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 enhancement of localized evaporation via separated light absorbing particles (plasmonic absorbers) and scattering particles (polystyrene nanoparticles). Evaporation has been considered as one of the most important phase-change processes in modern industries. To improve the efficiency of evaporation, one of the most feasible methods is to localize heat at the top water layer rather than heating the bulk water. In this work, the mixture of purely light absorptive plasmonic nanostructures such as gold nanoparticles and purely scattering particles (polystyrene nanoparticles) are employed to confine the incident light at the top of the solution and convert light to heat. Different concentrations of both the light absorbing centers and the light scattering centers were evaluated and the evaporation performance can be largely enhanced with the balance between absorbing centers and scattering centers. The findings in this study not only provide a new way to improve evaporation efficiency in plasmonic particle-based solution, but also shed lights on the design of new solar-driven localized evaporation systems.

No MeSH data available.


Related in: MedlinePlus

Schematic of evaporation performance set up of (a) purely absorptive aqueous AuNP solution and (b) purely absorptive AuNPs mixed with purely scattering PSNPs under 532-nm laser light illumination. The induced plasmonic heat is utilized to enhance the evaporation of water. (Fig. 1 was drawn by Chengyi Song).
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f1: Schematic of evaporation performance set up of (a) purely absorptive aqueous AuNP solution and (b) purely absorptive AuNPs mixed with purely scattering PSNPs under 532-nm laser light illumination. The induced plasmonic heat is utilized to enhance the evaporation of water. (Fig. 1 was drawn by Chengyi Song).

Mentions: This paper studies localized evaporation of solution with the mixture of light absorptive nanoparticles (plasmonic absorber) and light scattering nanoparticles (polystyrene nanoparticles (PSNPs)). Evaporation involving liquid-to-gas phase change has been recognized as one of the key energy conversion processes to be utilized in modern industries1. Plasmonic effect in nanostructures, induced by light-driven collective oscillations of charge carriers, has attracted tremendous attention due to its unique optical, electrochemical and photothermal properties2345678. Recently it was reported that, under light illumination, plasmonic nanoparticles suspended in water were able to convert light to heat and generate water vapor with fairly high evaporation efficiency (i.e. the ratio of the energy used for the vaporization of water to the total energy input)9101112. As shown in Fig. 1a, when light propagates through a solution containing gold nanoparticles (AuNPs), each AuNP converts input optical energy into thermal energy and the resulting energy heats up the surrounding water. Vapor bubbles are continuously generated within the bulk water and the vapor inside bubbles can be released after they travel a long distance to reach the top surface of water131415. In such process the heat transfer between freshly generated bubbles and surrounding bulk water is unavoidable and eventually large portion of energy is used to heat the bulk water rather than generating steam16.


Enhancing Localized Evaporation through Separated Light Absorbing Centers and Scattering Centers.

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

Schematic of evaporation performance set up of (a) purely absorptive aqueous AuNP solution and (b) purely absorptive AuNPs mixed with purely scattering PSNPs under 532-nm laser light illumination. The induced plasmonic heat is utilized to enhance the evaporation of water. (Fig. 1 was drawn by Chengyi Song).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660318&req=5

f1: Schematic of evaporation performance set up of (a) purely absorptive aqueous AuNP solution and (b) purely absorptive AuNPs mixed with purely scattering PSNPs under 532-nm laser light illumination. The induced plasmonic heat is utilized to enhance the evaporation of water. (Fig. 1 was drawn by Chengyi Song).
Mentions: This paper studies localized evaporation of solution with the mixture of light absorptive nanoparticles (plasmonic absorber) and light scattering nanoparticles (polystyrene nanoparticles (PSNPs)). Evaporation involving liquid-to-gas phase change has been recognized as one of the key energy conversion processes to be utilized in modern industries1. Plasmonic effect in nanostructures, induced by light-driven collective oscillations of charge carriers, has attracted tremendous attention due to its unique optical, electrochemical and photothermal properties2345678. Recently it was reported that, under light illumination, plasmonic nanoparticles suspended in water were able to convert light to heat and generate water vapor with fairly high evaporation efficiency (i.e. the ratio of the energy used for the vaporization of water to the total energy input)9101112. As shown in Fig. 1a, when light propagates through a solution containing gold nanoparticles (AuNPs), each AuNP converts input optical energy into thermal energy and the resulting energy heats up the surrounding water. Vapor bubbles are continuously generated within the bulk water and the vapor inside bubbles can be released after they travel a long distance to reach the top surface of water131415. In such process the heat transfer between freshly generated bubbles and surrounding bulk water is unavoidable and eventually large portion of energy is used to heat the bulk water rather than generating steam16.

Bottom Line: Evaporation has been considered as one of the most important phase-change processes in modern industries.Different concentrations of both the light absorbing centers and the light scattering centers were evaluated and the evaporation performance can be largely enhanced with the balance between absorbing centers and scattering centers.The findings in this study not only provide a new way to improve evaporation efficiency in plasmonic particle-based solution, but also shed lights on the design of new solar-driven localized evaporation systems.

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 enhancement of localized evaporation via separated light absorbing particles (plasmonic absorbers) and scattering particles (polystyrene nanoparticles). Evaporation has been considered as one of the most important phase-change processes in modern industries. To improve the efficiency of evaporation, one of the most feasible methods is to localize heat at the top water layer rather than heating the bulk water. In this work, the mixture of purely light absorptive plasmonic nanostructures such as gold nanoparticles and purely scattering particles (polystyrene nanoparticles) are employed to confine the incident light at the top of the solution and convert light to heat. Different concentrations of both the light absorbing centers and the light scattering centers were evaluated and the evaporation performance can be largely enhanced with the balance between absorbing centers and scattering centers. The findings in this study not only provide a new way to improve evaporation efficiency in plasmonic particle-based solution, but also shed lights on the design of new solar-driven localized evaporation systems.

No MeSH data available.


Related in: MedlinePlus