Anisotropic Growth of Silver Dendrites Regulated by Preferential Adsorption of Nitrate Ions on Crystal Facets,Crystal Research and Technology

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Anisotropic Growth of Silver Dendrites Regulated by Preferential Adsorption of Nitrate Ions on Crystal Facets
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2021-05-25 , DOI: 10.1002/crat.202100014
Haoyang Huang _{1,

2} , Xiangyu Dou _{1,

2,

3} , Yongsheng Han _{1,

2}

Affiliation

Dendritic structures are widely present in nature, from snowflakes to dendritic cells. However, their formation mechanisms are unclear, which causes long unsolved engineering problems, such as lithium dendrites. Here a strategy to control the growth of dendritic structures by the selective adsorption of ions on crystal facets is reported. Silver particles are synthesized by galvanic replacement reaction and the growth anisotropy of crystals is regulated by changing the concentration of nitrate ions in silver nitrate precursor solution. At a low concentration of nitrate ions, messy branching particles are synthesized while symmetric dendrites are generated at a high concentration of nitrate ions. Molecular dynamics simulation suggests that the selective adsorption of abundant nitrate ions on low-energy facets promotes the prior growth of the high-energy facets, resulting in the symmetric dendritic structures. When the potassium nitrate is changed to sodium nitrate, similar phenomena are obtained, confirming the role of selective adsorption of additives in regulating the growth anisotropy of crystals.

中文翻译：

硝酸根离子在晶面上的优先吸附调控银枝晶的各向异性生长

树突状结构广泛存在于自然界中，从雪花到树突状细胞。然而，它们的形成机制尚不清楚，这导致了长期未解决的工程问题，例如锂枝晶。本文报道了一种通过选择性吸附离子在晶面上来控制树枝状结构生长的策略。银粒子是通过电置换反应合成的，晶体的生长各向异性是通过改变硝酸银前体溶液中硝酸根离子的浓度来调节的。在低硝酸根离子浓度下，会合成杂乱的分支粒子，而在高浓度硝酸根离子下生成对称树突。分子动力学模拟表明，大量硝酸根离子在低能晶面上的选择性吸附促进了高能晶面的预先生长，从而形成了对称的树枝状结构。当硝酸钾变为硝酸钠时，得到了类似的现象，证实了添加剂的选择性吸附在调节晶体生长各向异性中的作用。

更新日期：2021-07-12

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