Chen D, Du W, Liu Y, Liu W, Kuznetsov A, Mendez FE, Philipson LH, Ismagilov RF.

Proc Natl Acad Sci U S A. 2008 Nov 4;105(44):16843-8. doi:10.1073/pnas.0807916105

The chemistrode: a droplet-based microfluidic device for stimulation and recording with high temporal, spatial, and chemical resolution.

Sampling with a stream of droplets contacting a surface.