Impact of molecular symmetry on crystallization pathways in highly supersaturated KH2PO4 solutions

Author:

Cho Yong ChanORCID,Lee Sooheyong,Wang LeiORCID,Lee Yun-Hee,Kim SeongheunORCID,Lee Hyun-Hwi,Lee John Jonghyun,Lee Geun WooORCID

Abstract

AbstractSolute structure and its evolution in supersaturated aqueous solutions are key clues to understand Ostwald’s step rule. Here, we measure the structural evolution of solute molecules in highly supersaturated solutions of KH2PO4 (KDP) and NH4H2PO4 (ADP) using a combination of electrostatic levitation and synchrotron X-ray scattering. The measurement reveals the existence of a solution-solution transition in KDP solution, caused by changing molecular symmetries and structural evolution of the solution with supersaturation. Moreover, we find that the molecular symmetry of H2PO4- impacts on phase selection. These findings manifest that molecular symmetry and its structural evolution can govern the crystallization pathways in aqueous solutions, explaining the microscopic origin of Ostwald’s step rule.

Funder

Korea Research Institute of Standards and Science

National Research Council of Science and Technology

Ministry of Science, ICT and Future Planning

Publisher

Springer Science and Business Media LLC

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