A method for continuously separating components from a sample, comprising the steps of: a. Providing a field-flow fractionation device comprising: i. An AC power source, ii. A channel comprising a sample inlet and a plurality of sample outlets, iii. A flow generator, coupled to the channel, for translocating the sample components along the channel in a first direction from the sample inlet to the plurality of sample outlets, iv. An actuator, distinct from the flow generator, coupled to the channel, for translocating the sample components in a second direction, at a first angle with the first direction, v. An array of electrodes, distinct from the flow generator and from the actuator, being - arranged in a plurality of rows, - electrically connected by electrical connections to the AC power source in such a way that adjacent rows can be set at different AC potentials and every other row can be set at a same AC potential, c. operating the flow generator in such a way as to feed the sample to the sample inlet and cause the translocation of the sample components along the channel in the first direction from the sample inlet to the plurality of sample outlets, wherein said feeding continues at least until a part of the sample has already reached the array of electrodes, d. operating the actuator so as to translocate the sample components in the second direction, at a first angle with the first direction, e. collecting sample components from the sample outlets; characterized in that - the array of electrodes is in a path taken by the sample components in the channel, and - in comprising step b of: b. operating the AC power source to generate an AC electric field between adjacent rows to set them at different AC potentials while every other row is set at a same AC potential. a. Providing a field-flow fractionation device comprising: i. An AC power source, ii. A channel comprising a sample inlet and a plurality of sample outlets, iii. A flow generator, coupled to the channel, for translocating the sample components along the channel in a first direction from the sample inlet to the plurality of sample outlets, iv. An actuator, distinct from the flow generator, coupled to the channel, for translocating the sample components in a second direction, at a first angle with the first direction, v. An array of electrodes, distinct from the flow generator and from the actuator, being - arranged in a plurality of rows, - electrically connected by electrical connections to the AC power source in such a way that adjacent rows can be set at different AC potentials and every other row can be set at a same AC potential, i. An AC power source, ii. A channel comprising a sample inlet and a plurality of sample outlets, iii. A flow generator, coupled to the channel, for translocating the sample components along the channel in a first direction from the sample inlet to the plurality of sample outlets, iv. An actuator, distinct from the flow generator, coupled to the channel, for translocating the sample components in a second direction, at a first angle with the first direction, v. An array of electrodes, distinct from the flow generator and from the actuator, being - arranged in a plurality of rows, - electrically connected by electrical connections to the AC power source in such a way that adjacent rows can be set at different AC potentials and every other row can be set at a same AC potential, - arranged in a plurality of rows, - electrically connected by electrical connections to the AC power source in such a way that adjacent rows can be set at different AC potentials and every other row can be set at a same AC potential, c. operating the flow generator in such a way as to feed the sample to the sample inlet and cause the translocation of the sample components along the channel in the first direction from the sample inlet to the plurality of sample outlets, wherein said feeding continues at least until a part of the sample has already reached the array of electrodes, d. operating the actuator so as to translocate the sample components in the second direction, at a first angle with the first direction, e. collecting sample components from the sample outlets; - the array of electrodes is in a path taken by the sample components in the channel, and - in comprising step b of: b. operating the AC power source to generate an AC electric field between adjacent rows to set them at different AC potentials while every other row is set at a same AC potential.