Artificial volcanoes to combat climates changing

It might be a great idea to create essentially an ""artificial volcano", to release particles of very specifically modified type into the stratosphere, exosphere, or thermosphere: particles that can change color to black or white depending on the amount of sunlight that starts to reach them. For example, perhaps one side facing the sun could be black and the side facing away, or facing the Earth, could be white. Or, have some particles be composed of structures resembling the shape of crystals, and be oriented in relation to the sun in a way as to reflect as much sunlight as possible towards the Earths' surface, and while facing the sun, to absorb as much sunlight as possible; I was initially thinking of something like that to put on the surface of the Earth, to create as much warmth as possible.