Patent ID: 7497996

Claim:
A liquid delivery method comprising: a first step for preparing a rotary substrate capable of rotating in at least a first rotation direction around a central axis of rotation, the rotary substrate being formed with a first chamber spatially closed, a second chamber spatially closed, and a fluid passage having a hydrophobic first fluid passage end portion connected to the first chamber and a second fluid passage end portion connected to the second chamber and connecting the first chamber with the second chamber, the first fluid passage end portion extending from the first chamber in the first rotation direction of the rotary substrate; a second step for accommodating a liquid in the first chamber; a third step for rotating the rotary substrate about the central axis of rotation at an acceleration a 1 directed to the same direction as the first rotation direction until a rotation velocity of the rotary substrate reaches at a predetermined rotation velocity RV 1 , resulting in that a centrifugal force directed to a radial direction r orthogonal to the first rotation direction acts on the liquid, but a capillary force due to the hydrophobicity of the first fluid passage end portion holds the liquid in the first chamber; and a fourth step for abruptly breaking the rotation of the rotary substrate at the rotary velocity RV 1 by an acceleration a 2 directed to an opposite direction with the first rotation direction and having an absolute value larger than that of the acceleration a 1 , thereby generating an inertial force exceeding the capillary force and oriented in the first rotation direction on the liquid in the first chamber, the inertial force causing the liquid to flow from the first chamber through the first fluid passage end portion and the fluid passage into the second chamber.