This invention describes the use of static mixing structures within a wick. The purpose of the mixing structures is to promote rapid mass transfer while maintaining high capillary pressure through the use of small pores. Most wicks cannot offer both high capillary pressure and high mass transfer concomitantly. This invention has been conceptualized but not reduced to practice. The use of wicking structures within microchannel devices is novel, especially when mass transfer is involved. These inventions are discussed in patent applications: W.E. TeGrotenhuis and V.S. Stenkamp, "Capillary Driven Gas- Liquid Separations in Microchannels," Patent Application 1329 1 -B and P.A. Gauglitz, V. S. Stenkamp, W.E. TeGrotenhuis, R.S. Wegeng, G.A. Whyatt, "Microsystem Capillary Separations," Patent Application 12639-E. The use of static mixing structures in wicks is a logical extension of these inventions. Applications are anticipated to be the same as in the patent applications and include processes such as distillation and absorption.