Publication

Enhanced tunneling conductivity induced by gelation of attractive colloids

Peter Ryser, Claudio Grimaldi
2013
Journal Articles

Abstract

We show that the formation of a gel by conducting colloidal particles leads to a dramatic enhancement in bulk conductivity, due to interparticle electron tunneling, combining predictions from molecular-dynamics simulations with structural measurements in an experimental colloid system. Our results show how colloidal gelation can be used as a general route to huge enhancements of conductivity, and suggest a feasible way for developing cheap materials with novel properties and low metal content.

Official source

https://infoscience.epfl.ch/entities/publication/a4f92ec1-a13b-4245-81d8-201a257b99f5

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Peter Ryser, Claudio Grimaldi
2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a4f92ec1-a13b-4245-81d8-201a257b99f5

About this result

Related concepts (30)

Colloidal crystal

A colloidal crystal is an ordered array of colloidal particles and fine grained materials analogous to a standard crystal whose repeating subunits are atoms or molecules. A natural example of this phenomenon can be found in the gem opal, where spheres of silica assume a close-packed locally periodic structure under moderate compression. Bulk properties of a colloidal crystal depend on composition, particle size, packing arrangement, and degree of regularity.

Colloid

A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Some definitions specify that the particles must be dispersed in a liquid, while others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size).

Hydraulic conductivity

In science and engineering, hydraulic conductivity (K, in SI units of meters per second), is a property of porous materials, soils and rocks, that describes the ease with which a fluid (usually water) can move through the pore space, or fractures network. It depends on the intrinsic permeability (k, unit: m^2) of the material, the degree of saturation, and on the density and viscosity of the fluid. Saturated hydraulic conductivity, Ksat, describes water movement through saturated media.

Related publications (1)

Enhanced tunneling conductivity induced by gelation of attractive colloids

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