Spinning disc centrifuge rotor

A spinning disc centrifuge rotor, comprising:

• a sample holder having:
• a cylindrical disc body having an axis and an axial length extending from a top face to a bottom face, and first and second coaxial cylindrical recesses extending through the top face and into the body;
• wherein the first recess extending deep into the body at a first depth from the top face and having a first diameter, the first recess defining a sample well having an upper rim, a planar floor, and a wall extending normal between the upper rim and planar floor, and adapted for receiving a cylindrical core sample;
• wherein the second recess extending into the body at a second depth from the top face, the second depth being less than the first depth of the first recess, the second recess having a second diameter greater than the first diameter of the first recess, and forming an annular ring extending outward from the upper rim of the first recess, and an outer periphery thereabout, the annular ring defining a planar floor between the upper rim and the outer periphery;
• and
• a circular cover plate attachable to and covering the top face of the cylindrical disc body;
• wherein the second recess defining a fluid collection chamber between the cover plate, and the floor and the outer periphery of the second recess;
• and
• a rotor shaft extending from the bottom face of the cylindrical disc body, the shaft defining an axis of rotation extending coaxially through the cylindrical disc body and concentrically through the circular cover plate;
• whereby, when the shaft is rotated, fluids in the core sample exit a face of the core sample adjacent to the cover plate, and denser portions of the fluids are driven by centrifugal force towards the outer periphery of the fluid collection chamber.