Nanoshells Made Easy: Improving Au Layer Growth on Nanoparticle Surfaces

Aqueous solutions containing light-absorbing nanoparticles have recently been shown to produce steam at high efficiencies upon solar illumination, even when the temperature of the bulk fluid volume remains far below its boiling point. Here we show that this phenomenon is due to a collective effect mediated by multiple light scattering from the dispersed nanoparticles. Randomly positioned nanoparticles that both scatter and absorb light are able to concentrate light energy into mesoscale volumes near the illuminated surface of the liquid. The resulting light absorption creates intense localized heating and efficient vaporization of the surrounding liquid. Light trapping-induced localized heating provides the mechanism for low-temperature light-induced steam generation and is consistent with classical heat transfer.

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“…(34,35) A detailed explanation of the synthesis of the gold nanomatryoshkas can also be found in recent literature. (28,29) …”

Section: Nanoparticle Synthesismentioning

confidence: 99%

Nanoparticles Heat through Light Localization

et al. 2014

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“…Carbon monoxide or hydrogen are cleaner variants of the reducing agents and can be separated from the reaction mixture by mere exposing to ambient atmosphere. Several groups utilized gaseous reactants in nanomaterials synthesis [66][67][68], including gold nanoshell synthesis [69]. As the size of GNPs depends on kinetics on nucleation and growth, any inhomogeneity during gas-liquid mass-transport would render the synthesis unreliable and irreproducible.…”

Section: Three Phase Segmented Flowmentioning

confidence: 99%

Microreactors for Gold Nanoparticles Synthesis: From Faraday to Flow

Rahman

Rebrov

2014

Processes

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Abstract:The seminal work of Michael Faraday in 1850s transmuted the "Alchemy of gold" into a fascinating scientific endeavor over the millennia, particularly in the past half century. Gold nanoparticles (GNPs) arguably hold the central position of nanosciences due to their intriguing size-and-shape dependent physicochemical properties, non-toxicity, and ease of functionalization and potential for wide range of applications. The core chemistry involved in the syntheses is essentially not very different from what Michael Faraday resorted to: transforming ions into metallic gold using mild reducing agents. However, the process of such reduction and outcome (shapes and sizes) are intricately dependent on basic operational parameters such as sequence of addition and efficiency of mixing of the reagents. Hence, irreproducibility in synthesis and maintaining batch-to-batch quality are major obstacles in this seemingly straightforward process, which poses challenges in scaling-up. Microreactors, by the virtue of excellent control over reagent mixing in space and time within narrow channel networks, opened a new horizon of possibilities to tackle such problems to produce GNPs in more reliable, reproducible and scalable ways. In this review, we will delineate the state-of-the-art of GNPs synthesis using microreactors and will discuss in length how such "flask-to-chip" paradigm shift may revolutionize the very concept of nanosyntheses.

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“…Gold coated SPIONs were fabricated by a multistep procedure through electroless plating of Au onto precursor nanoparticles [8,16]. The surface of SPIONs was functionalized with APTES to generate an amine terminated surface [17].…”

Section: Synthesis Of Gold Coated Spionsmentioning

confidence: 99%

Fabrication and Characterization of Magnetoplasmonic Liposome Carriers

Khosroshahi¹

2014

NSTOA

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Nanoshells Made Easy: Improving Au Layer Growth on Nanoparticle Surfaces

Cited by 232 publications

References 34 publications

Nanoparticles Heat through Light Localization

Nanoparticles Heat through Light Localization

Microreactors for Gold Nanoparticles Synthesis: From Faraday to Flow

Fabrication and Characterization of Magnetoplasmonic Liposome Carriers

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