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Growth of nanoparticles and microparticles by controlled reaction-diffusion processes

Walliser, Roché M. and Boudoire, Florent and Orosz, Eszter and Tóth, Rita and Braun, Artur and Rácz, Zoltán and Lagzi, István László (2015) Growth of nanoparticles and microparticles by controlled reaction-diffusion processes. Langmuir, 31 (5). pp. 1828-1834. ISSN 0743-7463

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Abstract

The synthesis of different sizes of nanoparticles and microparticles is important in designing nanostructured materials with various properties. Wet synthesis methods lack the flexibility to create various sizes of particles (particle libraries) using fixed conditions without the repetition of the steps in the method with a new set of parameters. Here, we report a synthesis method based on nucleation and particle growth in the wake of a moving chemical front in a gel matrix. The process yields well-separated regions (bands) filled with nearly monodisperse nanoparticles and microparticles, with the size of the particles varying from band to band in a predictable way. The origin of the effect is due to an interplay of a precipitation reaction of the reagents and their diffusion that is controlled in space and time by the moving chemical front. The method represents a new approach and a promising tool for the fast and competitive synthesis of various sizes of colloidal particles.

Item Type: Article
Uncontrolled Keywords: Synthesis (chemical); Synthesis method; Separated region; Precipitation reaction; Particle growth; Monodisperse nanoparticles; Micro-particles; Controlled reactions; Colloidal particle; Process control; Precipitation (chemical); NANOPARTICLES; Materials properties; Chemical reactions
Subjects: Q Science / természettudomány > QC Physics / fizika
Q Science / természettudomány > QD Chemistry / kémia > QD02 Physical chemistry / fizikai kémia
T Technology / alkalmazott, műszaki tudományok > T2 Technology (General) / műszaki tudományok általában
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 13 Oct 2015 13:39
Last Modified: 01 Feb 2016 00:15
URI: http://real.mtak.hu/id/eprint/29754

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