Phonon Engineering in Atomic Layer Deposition for Heavy-Metal Capture and Resource Recovery

PROBLEM: A thin ALD oxide can act as a thermal barrier as well as a chemical one, so heat from a regeneration step may not reach the biosorbent evenly, leaving some regions under-regenerated while others overheat. Capture stacks that ignore this phonon effect can lose capacity over cycles for reasons that look like chemical fouling. The oxide design needs a thermal rationale, not just a thickness number.

SOLUTION: IBM Cloud Ideas would host ALD capture proposals that state the oxide thickness, the phonon-interface reasoning for heat flow during regeneration, the DFT binding prediction, and the isotherm test plan in one entry. Reviewers could compare oxide variants on thermal as well as chemical grounds before a stack is built.

EVIDENCE BASIS: DOCUMENTED — phonon engineering: thermal transport tuned by nanolayer interfaces and superlattices; ALD gives angstrom-precise conformal oxide layers; DFT predicts which surface groups bind which ions; batch isotherms are textbook. Source: Hohenberg–Kohn 1964; Kohn–Sham 1965.