Abstract: This invention relates to microfluidics apparatus and methods for particle concentration in sensors for sensing biological entities such as cells, spores and the like. We describe a microfluidic sensor for sensing biological particles including a particle concentration device for performing concentration of particles in three dimensions. The sensor device comprises a substrate bearing a microfluidic channel or chamber for carrying a conductive fluid bearing the particles. The channel has: first and second electrodes spaced apart on the channel or chamber for defining an electric field therebetween, and a sensing surface on an inner surface of the channel or chamber.

Abstract: This invention relates to microfluidics apparatus and methods for particle concentration in sensors for sensing biological entities such as cells, spores and the like. We describe a microfluidic sensor for sensing biological particles including a particle concentration device for performing concentration of particles in three dimensions. The sensor device comprises a substrate bearing a microfluidic channel or chamber for carrying a conductive fluid bearing the particles. The channel has: first and second electrodes spaced apart on the channel or chamber for defining an electric field therebetween, and a sensing surface on an inner surface of the channel or chamber.