Microscope Slide Cooler

A poor man's microscopy cryo stage. We use this to prepare air-sensitive single crystals at low temperature in an inert atmosphere, but I don't see why it couldn't be used for other purposes such as biological samples. The idea is creating a cold upward N2 or air gradient over the sample, which is constantly replaced. The slide itself has a large contact surface with the cold gas flow, which helps maintain a constant sample temp. The gas is cooled by passing it through some sort of heat exchange