A micro-mirror device includes a substrate having a surface, and a plate spaced from and oriented substantially parallel to the surface of the substrate such that the plate and the surface of the substrate define a cavity therebetween. The thermally expandable microcapsule also provides a foamed product using the thermally expandable microcapsule. The transfer tube is coaxial with the piston, the piston rod, and the cylinder body and a discharge port of the fluid pump is in flow communication with an extension pressure chamber. The switch modules from each of the switches are configured to permit the switch modules from either switch to be used interchangeably to complete optical switching in the other. Only the DC image of the I picture passing through the blank test is outputted as the thumbnail image. Such methods can provide nanomaterials with improved morphologies relative to previous methods.