Globular Pattern Formation of Hierarchical Ceria Nanoarchitectures

Overview

Journal Commun Chem

Publisher Springer Nature

Specialty Chemistry

Date 2024 Jun 12

PMID 38867063

Authors

Noboru Aoyagi

Ryuhei Motokawa

Masahiko Okumura

Yuki Ueda

Takumi Saito

Shotaro Nishitsuji

Tomitsugu Taguchi

Takumi Yomogida

Gen Sazaki

Atsushi Ikeda-Ohno

Affiliations

Soon will be listed here.

Abstract

Dissipative structures often appear as an unstable counterpart of ordered structures owing to fluctuations that do not form a homogeneous phase. Even a multiphase mixture may simultaneously undergo one chemical reaction near equilibrium and another one that is far from equilibrium. Here, we observed in real time crystal seed formation and simultaneous nanocrystal aggregation proceeding from Ce complexes to CeO nanoparticles in an acidic aqueous solution, and investigated the resultant hierarchical nanoarchitecture. The formed particles exhibited two very different size ranges, resulting in further pattern formation with opalescence. The hierarchically assembled structures in solutions were CeO colloids, viz. primary core clusters (1-3 nm) of crystalline ceria and secondary clusters (20-30 nm) assembled through surface ions. Such self-assembly is widespread in multi-component complex fluids, paradoxically moderating hierarchical reactions. Stability and instability are not only critical but also complementary for co-optimisation around the nearby free energy landscape prior to bifurcation.

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