方向特定的相互作用通过定向附着力迫使氧化锌晶体生长。,Nature Communications

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方向特定的相互作用通过定向附着力迫使氧化锌晶体生长。
Nature Communications ( IF 14.7 ) Pub Date : 2017-10-10 , DOI: 10.1038/s41467-017-00844-6
X. Zhang , Z. Shen , J. Liu , S. N. Kerisit , M. E. Bowden , M. L. Sushko , J. J. De Yoreo , K. M. Rosso

颗粒附着引起的结晶正在影响我们对天然矿化过程的理解，并为新颖的材料设计提供了希望。当颗粒以晶体学排列方式聚集时，通过仍难以量化的颗粒间作用力实现近乎完美的共排列，可以排出中间溶剂并实现颗粒聚结。在这里，我们报告了水溶液中ZnO（0001）-ZnO（000 [公式：参见文字]）系统的这些纳米级对准力的测量和模拟。使用纳米工程单晶探针的动态力谱显示了60 ^o的吸引力旋转周期。计算得出的平均力的距离和与方向有关的电势显示出一些有吸引力的自由能井，这些自由能井的中间水层数量独特，排列时达到最小值。计算出的分离出有吸引力结合的溶剂化界面的活化能可完美地再现所测得的60 ^o周期性，揭示了介入水结构的关键作用，作为产生完成对齐并实现聚结的粒子间扭矩的基础。晶体生长是一个基本过程，在广泛的领域中都很重要，但负责分子对齐的粒子间作用力却不大完全了解。在这里，作者使用动态力谱法测量了ZnO中的取向力，突出了介入水分子的作用。

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Direction-specific interaction forces underlying zinc oxide crystal growth by oriented attachment.

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 60^o 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 60^o 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.

更新日期：2017-10-10

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