Abstract:
:Crystallization by particle attachment is impacting our understanding of natural mineralization processes and holds promise for novel materials design. When particles assemble in crystallographic alignment, expulsion of the intervening solvent and particle coalescence are enabled by near-perfect co-alignment via interparticle forces that remain poorly quantified. Here we report measurement and simulation of these nanoscale aligning forces for the ZnO(0001)-ZnO(000[Formula: see text]) system in aqueous solution. Dynamic force spectroscopy using nanoengineered single crystal probes reveals an attractive force with 60o rotational periodicity. Calculated distance and orientation-dependent potentials of mean force show several attractive free energy wells distinguished by numbers of intervening water layers, which reach a minimum when aligned. The calculated activation energy to separate the attractively bound solvated interfaces perfectly reproduces the measured 60o periodicity, revealing the key role of intervening water structuring as a basis to generate the interparticle torque that completes alignment and enables coalescence.Crystal growth is a fundamental process, important in a wide range of fields, but the interparticle forces responsible for molecule alignment are not well understood. Here, the authors measure the alignment forces in ZnO using dynamic force spectroscopy, highlighting the role of intervening water molecules.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang X,Shen Z,Liu J,Kerisit SN,Bowden ME,Sushko ML,De Yoreo JJ,Rosso KMdoi
10.1038/s41467-017-00844-6subject
Has Abstractpub_date
2017-10-10 00:00:00pages
835issue
1issn
2041-1723pii
10.1038/s41467-017-00844-6journal_volume
8pub_type
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