Patent ID: 8287617

Claim:
A method for producing an alloy fine particle colloid by heating and evaporating a raw material binary alloy which is in a solid state in an ambient temperature and pressure environment under a vacuum of not more than 5Ã—10 âˆ’4 Torr and bringing a generated vapor into contact with a liquid medium charged in the inside of a rotary vacuum chamber, and cooling the generated vapor for condensation and solidification to form an alloy fine particle colloid, wherein (1) when an atomic fraction of a component element in the raw material alloy is defined as X, a component ratio of each of the elements of the raw material alloy is regulated such that a fraction of a vapor pressure of the component element to the total vapor pressure of the raw material alloy falls within the range of from (Xâˆ’0.1) to (X+0.1); (2) the raw material binary alloy is an alloy species which forms a homogeneous alloy phase in an alloy ingot; (3) the liquid medium has low vapor pressure not larger than 5Ã—10 âˆ’4 Torr at room temperature; and (4) the liquid medium is cooled by cooling water flow outside of a cylinder, and the liquid medium is kept substantially at room temperature at the time of synthesis of the alloy fine particle.