Unfortunately, there is a long history of heavy government intervention to specify what refrigerants can be used in refrigerators! Remember ozone depletion potential (ODP) and global warming potential (GWP)!
"In this work, researchers led by Daniel Madyira studied an alternative refrigerant called R600a, or isobutane. This chemical has a low GWP as well as a low ODP and is starting to replace R134a in new refrigeration units, especially domestic and light commercial systems such as fridges, freezers and drink dispensers. ... R600a, unlike R134a, is flammable ..."
Nanolubricant makes household fridges more efficient – Physics World Adding multi-walled carbon nanotubes (MWCNTs) to a common refrigerant can reduce a domestic refrigerator’s power consumption by nearly 30%, according to researchers at the University of Johannesburg in South Africa.
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