Centrifugal field-flow fractionation device including arc-shaped channel member

A method of making a centrifugal field-flow fractionation device, comprising:

• deforming a straight member into an arc shape to form an arc-shaped channel member;
• providing the arc-shaped channel member along an inner peripheral surface of a rotor, wherein the arc-shaped channel member includes an arc-shaped outer peripheral surface formed on a rotor side and an arc-shaped inner peripheral surface formed on a rotation axis side, the arc-shaped channel member includes a channel for a liquid sample is formed inside, an inlet for a liquid sample to the channel, and an outlet for a liquid sample from the channel;
• and
• wherein the arc-shaped channel member is configured to be rotated about a rotation axis so that particles in a liquid sample in the channel are classified by a centrifugal force;
• wherein a pressure increasing mechanism is provided downstream of the channel and is configured to increase pressure by an amount in the range 0.2 MPa to 0.5 MPa in the channel such that the inner surfaces of the channel are pressed outward by a liquid sample in the channel such that the outer peripheral surface and the inner peripheral surface are suppressed from being recessed toward the channel side thereby to maintain the outer peripheral surface and the inner peripheral surface in a shape extending straight along a direction parallel to the rotation axis,
• wherein the channel member is formed of a hollow member in which the channel is formed inside by the outer peripheral surface and the inner peripheral surface formed integrally, and
• wherein the channel member includes a plurality of laminated layers, the plurality of laminated layers being bonded to each other, the plurality of layers including an outer surface layer on which the outer peripheral surface is formed and an inner surface layer on which the inner peripheral surface is formed.