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dc.contributor.authorDongare, Pratiksha D.
Alabastri, Alessandro
Neumann, Oara
Nordlander, Peter
Halas, Naomi J.
dc.date.accessioned 2019-08-16T14:47:26Z
dc.date.available 2019-08-16T14:47:26Z
dc.date.issued 2019
dc.identifier.citation Dongare, Pratiksha D., Alabastri, Alessandro, Neumann, Oara, et al.. "Solar thermal desalination as a nonlinear optical process." Proceedings of the National Academy of Sciences, 116, no. 27 (2019) National Academy of Sciences: 13182-13187. https://doi.org/10.1073/pnas.1905311116.
dc.identifier.urihttps://hdl.handle.net/1911/106253
dc.description.abstract The ever-increasing global need for potable water requires practical, sustainable approaches for purifying abundant alternative sources such as seawater, high-salinity processed water, or underground reservoirs. Evaporation-based solutions are of particular interest for treating high salinity water, since conventional methods such as reverse osmosis have increasing energy requirements for higher concentrations of dissolved minerals. Demonstration of efficient water evaporation with heat localization in nanoparticle solutions under solar illumination has led to the recent rapid development of sustainable, solar-driven distillation methods. Given the amount of solar energy available per square meter at the Earth’s surface, however, it is important to utilize these incident photons as efficiently as possible to maximize clean water output. Here we show that merely focusing incident sunlight into small “hot spots” on a photothermally active desalination membrane dramatically increases––by more than 50%––the flux of distilled water. This large boost in efficiency results from the nearly exponential dependence of water vapor saturation pressure on temperature, and therefore on incident light intensity. Exploiting this inherent but previously unrecognized optical nonlinearity should enable the design of substantially higher-throughput solar thermal desalination methods. This property provides a mechanism capable of enhancing a far wider range of photothermally driven processes with supralinear intensity dependence, such as light-driven chemical reactions and separation methods.
dc.language.iso eng
dc.publisher National Academy of Sciences
dc.rights This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the National Academy of Sciences.
dc.title Solar thermal desalination as a nonlinear optical process
dc.type Journal article
dc.citation.journalTitle Proceedings of the National Academy of Sciences
dc.contributor.org Laboratory for Nanophotonics
dc.contributor.org Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment
dc.subject.keyworddesalination
hot spots
nonlinear
solar
thermal
dc.citation.volumeNumber 116
dc.citation.issueNumber 27
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1073/pnas.1905311116
dc.identifier.pmcid PMC6613098
dc.identifier.pmid 31209030
dc.type.publication post-print
dc.citation.firstpage 13182
dc.citation.lastpage 13187


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