Heterogeneous nucleation and microstructure formation in colloidal model systems with various interactions

Lederer, Achim; Franke, Markus; Schöpe, Hans Joachim

doi:10.1140/epjst/e2014-02098-9

Cited by 10 publications

(8 citation statements)

References 139 publications

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“…Nevertheless, any system in which the heterogeneously grown crystal has a different structure from the thermodynamically favoured crystal will accumulate seed-induced distortions. They not only result in a decrease of the crystallization speed 8 22 28 29 30 but can also lead to detachment allowing the crystallite to release the elastic stress. This is expected to be very common, as a perfect match is very difficult to achieve in practice.…”

Section: Discussionmentioning

confidence: 99%

Crystallization seeds favour crystallization only during initial growth

et al. 2015

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Crystallization represents the prime example of a disorder–order transition. In realistic situations, however, container walls and impurities are frequently present and hence crystallization is heterogeneously seeded. Rarely the seeds are perfectly compatible with the thermodynamically favoured crystal structure and thus induce elastic distortions, which impede further crystal growth. Here we use a colloidal model system, which not only allows us to quantitatively control the induced distortions but also to visualize and follow heterogeneous crystallization with single-particle resolution. We determine the sequence of intermediate structures by confocal microscopy and computer simulations, and develop a theoretical model that describes our findings. The crystallite first grows on the seed but then, on reaching a critical size, detaches from the seed. The detached and relaxed crystallite continues to grow, except close to the seed, which now prevents crystallization. Hence, crystallization seeds facilitate crystallization only during initial growth and then act as impurities.

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Section: Discussionmentioning

confidence: 99%

Crystallization seeds favour crystallization only during initial growth

et al. 2015

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“…Hence, the knowledge about the crystallization mechanism of generic crystals, such as colloidal or rare gas crystals, may improve the understanding of heterogeneous ice nucleation. The morphology of surfaces and the strengths of the crystallizing particles-surface interactions play a decisive role in the heterogeneous crystal nucleation [51]. Computer simulations and experimental investigations of colloidal crystal nucleation indicate that the curvature of the substrate affect the heterogeneous crystal nucleation.…”

Section: The Importance Of Molecular Modeling For the Understanding Omentioning

confidence: 99%

Perspectives on the Future of Ice Nucleation Research: Research Needs and Unanswered Questions Identified from Two International Workshops

et al. 2017

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There has been increasing interest in ice nucleation research in the last decade. To identify important gaps in our knowledge of ice nucleation processes and their impacts, two international workshops on ice nucleation were held in Vienna, Austria in 2015 and 2016. Experts from these workshops identified the following research needs: (1) uncovering the molecular identity of active sites for ice nucleation; (2) the importance of modeling for the understanding of heterogeneous ice nucleation; (3) identifying and quantifying contributions of biological ice nuclei from natural and managed environments; (4) examining the role of aging in ice nuclei; (5) conducting targeted sampling campaigns in clouds; and (6) designing lab and field experiments to increase our understanding of

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“…At the late stages of the transition, however, the spherical impurity which initially acted as a nucleation site may frustrate the growth process of the crystals. 9 , 10 Further studies analyzed the impacts of planar 11 − 14 and patterned surfaces 15 − 26 indicating that, while a flat substrate drastically reduces the free energy barrier to the crystalline phase by favoring the formation of the initial crystalline layer at the wall even at pre-transition conditions, the effect of a rough substrate strongly depends on the commensurability of the wall and crystal structures. Similarly, pre-structured clusters, templates, and impurities of finite size 8 , 10 , 27 − 32 influence the transition to a degree which is determined by the commensurability of the structures, supersaturation, and the size of the additives.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Crystallization on Pairs of Pre-Structured Seeds

Jungblut

Dellago

2016

J. Phys. Chem. B

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Studying the effects of small pre-structured seeds on the crystallization transition in an undercooled monodisperse Lennard-Jones fluid with transition interface path sampling combined with molecular dynamics simulations, we analyze the impact of the simultaneous presence of two seeds with various structures. In the presence of seeds with face- and body-centered cubic structures, we find that decreasing the seed-to-seed distance enhances the probability of the crystalline clusters formed on one of the seeds to grow beyond the critical size, thus, increasing the crystal nucleation rates. In contrast, when seeds have an icosahedral structure, the crystalline clusters form mostly in the bulk. The crystal nucleation rate, however, is also determined by the distance between the seeds with regular structure in which the lattice spacing is equal to the bulk lattice constant, pointing to a heterogeneous crystal nucleation that occurs away from the icosahedrally structured seeds. For slightly squeezed seeds, the effects of the presence of seeds with face- and body-centered cubic structures are reduced in comparison to the regular seeds, and we do not see any effect of the presence of the second seed for seeds with squeezed icosahedral structure.

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Heterogeneous nucleation and microstructure formation in colloidal model systems with various interactions

Cited by 10 publications

References 139 publications

Crystallization seeds favour crystallization only during initial growth

Crystallization seeds favour crystallization only during initial growth

Perspectives on the Future of Ice Nucleation Research: Research Needs and Unanswered Questions Identified from Two International Workshops

Heterogeneous Crystallization on Pairs of Pre-Structured Seeds

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