Publication

Controlled Microsynthesis of Silica Particles in a Microfluidic Setup

Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker
2009
Conference Papers

Abstract

We report on a novel microsynthesis method for easy controlling the size of silica micro- and nanoparticles. Colloids are synthesized in a microfluidic chamber by layer-wise adsorption of silica to precipitated nuclei. We prepare samples of spherical particles with different numbers of coatings and find that particles with less than 15 coating layers are uniform in size. Particles with more coatings are disperse. This finding is attributed to peptization of nanoparticles and independent growth of secondary nanoparticles. For all numbers of layers, the maximum particle size increases with the number of coatings.

Official source

https://infoscience.epfl.ch/entities/publication/3858acde-cdf9-4921-a1d0-797e43a288c1

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Martinus Gijs, Virendra Kumar Parashar, Josias Basil Wacker
2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3858acde-cdf9-4921-a1d0-797e43a288c1

About this result

Related concepts (19)

Silica gel

Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids may contain water or some other liquids, or may be filled by gas or vacuum. In the last case, the material is properly called silica xerogel. Silica xerogel with an average pore size of 2.4 nanometers has a strong affinity for water molecules and is widely used as a desiccant.

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The silica cycle is the biogeochemical cycle in which biogenic silica is transported between the Earth's systems. Silicon is considered a bioessential element and is one of the most abundant elements on Earth. The silica cycle has significant overlap with the carbon cycle (see carbonate–silicate cycle) and plays an important role in the sequestration of carbon through continental weathering, biogenic export and burial as oozes on geologic timescales.

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