{"id":798,"date":"2024-09-25T10:10:46","date_gmt":"2024-09-25T10:10:46","guid":{"rendered":"https:\/\/biblioconf.lpgp.universite-paris-saclay.fr\/wordpress\/?page_id=798"},"modified":"2024-11-12T15:29:13","modified_gmt":"2024-11-12T15:29:13","slug":"ex-1-taylored-nanoparticle-synthesis-compo-size-structure-versus-plasma-conditions-of-formation-with-different-plasma-filaments-micro-discharge-in-dbd-streamer-spark-in-corona","status":"publish","type":"page","link":"https:\/\/www.lpgp-wp1.universite-paris-saclay.fr\/fr\/ex-1-taylored-nanoparticle-synthesis-compo-size-structure-versus-plasma-conditions-of-formation-with-different-plasma-filaments-micro-discharge-in-dbd-streamer-spark-in-corona\/","title":{"rendered":"Ex.1 TAYLORED NANOPARTICLE SYNTHESIS (Compo, size, structure) versus plasma conditions of formation with different plasma filaments (micro-discharge in DBD, streamer, spark in corona)"},"content":{"rendered":"\n

Ex.1 TAYLORED NANOPARTICLE SYNTHESIS (COMPO, SIZE, STRUCTURE) VERSUS PLASMA CONDITIONS OF FORMATION WITH DIFFERENT PLASMA FILAMENTS (MICRO-DISCHARGE IN DBD, STREAMER,SPARK IN CORONA)<\/h1>\n\n\n\n
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CONTACT : JEAN-PASCAL BORRA <\/p>\n\n\n\n

Plasma-based aerosol processes for catalytic properties of multi-Metal nanoparticles (NP)<\/p>\n\n\n\n

Nucleation in plasmas is a long term topic of LPGP depicted in [14<\/a>, 18<\/a>, 19<\/a>, 20<\/a>, 24<\/a>, 26<\/a>, 31<\/a>, 40<\/a>, 44<\/a>, T14<\/a>, T15<\/a>, T27<\/a>, T30<\/a>, T31<\/a>, T33<\/a>, T34<\/a>].<\/p>\n\n\n\n

Atmospheric pressure Plasma in nitrogen and air are confined in time and space, as plasma filaments lasting a few ns, from tens to few micrometers in diameter. The production of condensable species and nucleation necessarily occurs either from cooling of expanding vapor plumes produced by plasma-surface interaction, depicted just below, or from injection of gaseous precursors in the plasma for reactive nucleation (cf. Ex.2<\/a>,).<\/p>\n\n\n\n

Tuning plasma properties, like energy per filament and dynamic of energy deposition on surfaces, is a simple way to control the conditions of NP synthesis and related properties.
Indeed, NP are formed by condensation (or nucleation) of hot vapors in expanding vapors jets\/clouds from the electrodes (Mo, W, Al, Fe, Ni, Cu, Sn, Zn, Au, Ag, Pt) and from dielectric material (alumina).
We confirmed this mechanism with different alloyed electrodes with IJL-Nancy. However, core-shell NP of Cu@ZnO are produced from Cu-Zn alloys, while alloyed Co-Ni NP are synthesized in similar plasma conditions from Co-Ni alloys.<\/p>\n\n\n\n

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Going one step further, the effect of cooling rates of expanding vapor jets on the structure of nanoparticules, is under investigation to select plasma operating conditions (controlling the filaments electro-thermal properties) versus targeted composition and structure of NP. Metastable multi-Metal crystal structures are expected with respect to cooling rates in prevented spark, typical of those required for high entropy alloys formation (over 105 K.s-1). The goal is to control optical properties, like UV photoemission and catalytic properties of multi-Metal nanoparticles.<\/p>\n\n\n\n

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Laboratoire de Physique des Gaz et des Plasmas<\/h3>\n\n\n\n

Bat 210, rue Henri Becquerel<\/p>\n\n\n\n

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