Patent ID: 6676766
Filing Date: 2004-01-13
Classification: B01F,B08B,C11D,H01L,Y10S

Abstract:
A method for cleaning a substrate, comprising the steps of:providing a sherbet-like cleaning composition consisting of snow ice crystal grains and a liquid organic chemical agent and moving the sherbet-like cleaning composition relative to the substrate to be cleaned along at least one of the surfaces thereof, said organic chemical agent of the composition being operable to reduce the adhesion of residual particles to said at least one surface of the substrate, and said sherbet-like cleaning composition having a consistency allowing the particles on said at least one surface of the substrate to be entrapped therein to thereby enable the particles to be removed from said at least one surface of the substrate, wherein said step of providing the sherbet-like composition comprises the steps of mixing the liquid organic agent and pure water in a predetermined mixing ratio in a mixing vessel to form a mixture, and then supercooling the mixture uniformly therethroughout at a predetermined temperature lower than the freezing point of the pure water and greater than that of the organic chemical agent while stirring the mixture in a manner permitting the pure water to grow into snow ice crystal grains, and wherein said stirring step comprises steps of creating vortices in the mixture, growing the vortices and diffusing the grown vortices in the mixture.