The paper "Observation of Single Colloidal Platinum Nanocrystal Growth Trajectories" by Haimei Zheng and colleagues from Lawrence Berkeley National Laboratory and the University of California, Berkeley, presents a detailed study on the growth mechanisms of colloidal platinum nanocrystals. Using in situ transmission electron microscopy (TEM), the authors observed that platinum nanocrystals can grow through monomer attachment from solution or by coalescence between particles. Surprisingly, an initially broad size distribution of the nanocrystals can spontaneously narrow, suggesting that different growth pathways are influenced by size- and morphology-dependent internal energies. The study challenges classical growth models and highlights the importance of coalescence in nanocrystal synthesis. The findings have significant implications for understanding and controlling the growth of other nanocrystal systems. The research was supported by the U.S. Department of Energy and the University of California.The paper "Observation of Single Colloidal Platinum Nanocrystal Growth Trajectories" by Haimei Zheng and colleagues from Lawrence Berkeley National Laboratory and the University of California, Berkeley, presents a detailed study on the growth mechanisms of colloidal platinum nanocrystals. Using in situ transmission electron microscopy (TEM), the authors observed that platinum nanocrystals can grow through monomer attachment from solution or by coalescence between particles. Surprisingly, an initially broad size distribution of the nanocrystals can spontaneously narrow, suggesting that different growth pathways are influenced by size- and morphology-dependent internal energies. The study challenges classical growth models and highlights the importance of coalescence in nanocrystal synthesis. The findings have significant implications for understanding and controlling the growth of other nanocrystal systems. The research was supported by the U.S. Department of Energy and the University of California.