Synthesis of Core-Shell Nanoparticles Si-ZnS by Reactive Deposition of Photocatalytic ZnS Layer on the Surface of Carrier Si Nanoparticles in Aerosol Microdrops

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F15%3A10235817" target="_blank" >RIV/61989100:27640/15:10235817 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.sbspro.2015.06.254" target="_blank" >http://dx.doi.org/10.1016/j.sbspro.2015.06.254</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.sbspro.2015.06.254" target="_blank" >10.1016/j.sbspro.2015.06.254</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis of Core-Shell Nanoparticles Si-ZnS by Reactive Deposition of Photocatalytic ZnS Layer on the Surface of Carrier Si Nanoparticles in Aerosol Microdrops

Popis výsledku v původním jazyce

In this work we report on the aerosol synthesis of photocatalytic powder nanostructures of core-shell Si-ZnS particles. Submicron Si particles were prepared in the form of an aqueous dispersion by disintegration of the semiconductor-grade silicon powder in the cavitation Water Jet Mill disintegrator. Adding zinc acetate converted aqueous dispersion medium into a solution of Zn(Ac)(2) in various concentrations. The thus prepared liquid dispersion was then transformed into aerosol microdroplets with an average size of 3.5 microns in the Omron NE-U17 nebulizer. These were subsequently transported by flowing gas into the vigorously stirred aqueous solution of sodium sulfide. At impact of these aerosol microreactors the two liquid reactants produce zinc sulphide. Due to heterogeneous nucleation the insoluble phase of ZnS is precipitated on the phase surface of the silicon carrier particles contained in the microdroplets. As the amount of Zn(Ac)(2) in a microdroplet is limited, so is the extent of the precipitation reaction and the thickness of the container can be regulated by Zn(Ac)(2) concentration in the liquid dispersion. The obtained liquid dispersion of core-shell particles of Si-ZnS was dryed by controlled vacuum sublimation and stabilized in the form of lamellar nanoaggregates with a relatively high surface area. The final material enables easy handling and shows significantly higher photocatalytic activity than TiO2 Evonik P25 standard.

Název v anglickém jazyce

Synthesis of Core-Shell Nanoparticles Si-ZnS by Reactive Deposition of Photocatalytic ZnS Layer on the Surface of Carrier Si Nanoparticles in Aerosol Microdrops

Popis výsledku anglicky

In this work we report on the aerosol synthesis of photocatalytic powder nanostructures of core-shell Si-ZnS particles. Submicron Si particles were prepared in the form of an aqueous dispersion by disintegration of the semiconductor-grade silicon powder in the cavitation Water Jet Mill disintegrator. Adding zinc acetate converted aqueous dispersion medium into a solution of Zn(Ac)(2) in various concentrations. The thus prepared liquid dispersion was then transformed into aerosol microdroplets with an average size of 3.5 microns in the Omron NE-U17 nebulizer. These were subsequently transported by flowing gas into the vigorously stirred aqueous solution of sodium sulfide. At impact of these aerosol microreactors the two liquid reactants produce zinc sulphide. Due to heterogeneous nucleation the insoluble phase of ZnS is precipitated on the phase surface of the silicon carrier particles contained in the microdroplets. As the amount of Zn(Ac)(2) in a microdroplet is limited, so is the extent of the precipitation reaction and the thickness of the container can be regulated by Zn(Ac)(2) concentration in the liquid dispersion. The obtained liquid dispersion of core-shell particles of Si-ZnS was dryed by controlled vacuum sublimation and stabilized in the form of lamellar nanoaggregates with a relatively high surface area. The final material enables easy handling and shows significantly higher photocatalytic activity than TiO2 Evonik P25 standard.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Technology, Innovation and Entrepreneurship : proceedings of the world conference : May 28-30, 2015, Istanbul, Turkey

ISBN

—

ISSN

1877-0428

e-ISSN

neuvedeno

Počet stran výsledku

8

Strana od-do

2122-2129

Název nakladatele

Elsevier

Místo vydání

Amsterdam

Místo konání akce

Istanbul

Datum konání akce

28. 5. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000380509900257