Abstract: The present invention provides a composite material sheet wherein a filler is oriented in a given direction in an organic resin matrix by an electric field. The composite material sheet of the present invention 10 contains filler 1 and organic resin 3, and is characterized in that the filler 1 is dendritically aggregated in the organic resin matrix and oriented in the thickness direction. As a result, properties such as dielectric property, conductivity, thermal conductivity and the like can be strikingly improved as compared to conventional composite materials obtained by simply dispersing a filler.

Abstract: The present invention provides a method for uniformly dispersing dispersoids in a dispersion medium. The method of the present invention for dispersing dispersoids includes applying an electric field to a mixture of a dispersion medium and dispersoids. In this dispersion method, a dispersion apparatus containing a container 3 for placing a mixture 2 of a dispersion medium and dispersoids, and an electric field application means 4 for applying an electric field to the mixture 2, which has a pair of opposing electrodes 5a and 5b, can be used.