Journal Article solar steam generation 39355-34-5 7440-57-5 7631-86-9 7OV03QG267 Anaerobic digestion Complementary circuits E1UOL152H7 Gold Iron Machine learning Methane Methane production Nickel OP0UW79H66 Prediction Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Resins, Synthetic Silicon Dioxide Zero-valent iron absorption aerogels aerosol jet printing electrolyte gated transistors flexible electronics graphene oxide gravure printing heat loss