Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids,ACS Nano

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Crystal-to-Crystal Transitions in Binary Mixtures of Soft Colloids
ACS Nano ( IF 15.8 ) Pub Date : 2020-11-14 , DOI: 10.1021/acsnano.0c03966
Jasper N. Immink ₁ , Maxime J. Bergman ₂ , J. J. Erik Maris ₃ , Joakim Stenhammar ₁ , Peter Schurtenberger _{1,

4}

Affiliation

In this article, we demonstrate a method for inducing reversible crystal-to-crystal transitions in binary mixtures of soft colloidal particles. Through a controlled decrease of salinity and increasingly dominating electrostatic interactions, a single sample is shown to reversibly organize into entropic crystals, electrostatic attraction-dominated crystals, or aggregated gels, which we quantify using microscopy and image analysis. We furthermore analyze crystalline structures with bond order analysis to discern between two crystal phases. We observe the different phases using a sample holder geometry that allows both in situ salinity control and imaging through confocal laser scanning microscopy and apply a synthesis method producing particles with high resolvability in microscopy with control over particle size. The particle softness provides for an enhanced crystallization speed, while altering the re-entrant melting behavior as compared to hard sphere systems. This work thus provides several tools for use in the reproducible manufacture and analysis of binary colloidal crystals.

中文翻译：

软胶体二元混合物中的晶体到晶体的转变

在本文中，我们演示了一种在软胶体颗粒的二元混合物中诱导可逆的晶体间转换的方法。通过控制盐度的降低和逐渐增加的静电相互作用，可以显示单个样品可逆地组织成熵晶体，以静电引力为主的晶体或聚集的凝胶，我们使用显微镜和图像分析对其进行量化。我们进一步通过键序分析来分析晶体结构，以区分两个晶体相。我们使用样品架几何形状观察不同的相位，从而可以同时进行通过共聚焦激光扫描显微镜对盐度进行控制和成像，并应用合成方法在显微镜下产生具有高可分辨性的颗粒，并控制粒径。与硬球系统相比，颗粒柔软度可提高结晶速度，同时改变凹角熔化行为。因此，这项工作提供了用于可重复制造和分析二元胶体晶体的几种工具。

更新日期：2020-11-25

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