We will introduce how an evaporation technique, one of physical methods producing microcrystals, is applied in colloid chemistry for making nanometer-sized dispersions ranging a materials spectrum from metals, ionic crystals and to organic compounds. First, I describe several methods to prepare nanocolloids based on a gas evaporation technique and a vacuum evaporation technique combined with a gas flow method which has been developed and largely applied to many kinds of dispersions in our laboratory. Second, a crystal growing mechanism in this peculiar system is discussed emphasizing its nonequilibrium process. Third, stability and instability of this unique system are discussed in relation to a correlation diagram, proposed in this study, based on the microscopic properties of the constituents of the colloids. Finally, many findings related to the nanometric materials dispersed in organic liquids are reviewed taking examples in our research such as the photo-induced coagulation phenomenon, catalytic oxidation found in gold nano-dispersions in 2-propanol, modulation of electronic state of a single zinc nano-particle when it is in contact with other particles and luminescent characteristics in Si nanocolloids which is a current interest in optical devices and mostly studied in the field of physics and electric engineering. All these findings are substantiated when the evaporation method is applied to colloid chemistry.