Connecting Surface‐Forces‐Based Energy Barriers to Nonhomogeneous Colloidal Structures to Appear from Volatile Binary Mixtures of Same Size Nanoparticle Species,Advanced Functional Materials

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Connecting Surface‐Forces‐Based Energy Barriers to Nonhomogeneous Colloidal Structures to Appear from Volatile Binary Mixtures of Same Size Nanoparticle Species
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-09-16 , DOI: 10.1002/adfm.202005486
Ekhlas Homede ₁ , Mohammad Abo Jabal ₁ , Ofer Manor ₁

Affiliation

The capacity of nanoparticles to self‐arrange to various structures and their unique physical properties has made these building blocks essential in a broad range of applications and scientific disciplines. In this work, the manipulation of particulate structures that appear from binary dispersions is demonstrated, comprising same size particles of two different chemistries, following the evaporation of an electrolyte solution carrier. By varying the ionic strength and pH in the solutions, the balance between attractive and repulsive surface forces is tuned, that is, electrical double layer, Van der Waals, hydrophobic, and hydrophilic forces, in the binary particle mixtures. Hence, the corresponding potential energy barriers are tuned to particle attachments to each other and to the underlying substrate and alter the nanoscopic arrangement of the different types of particles in the microscopic particulate structures, which appear by convective pattern formation. Hence, by realizing the physical mechanisms which govern the potential energy contributions to the pattern formation of particulate structures at the nanometer scale, the 3D morphology of binary mixtures of same size particles is rendered homogeneous, layered, or phases separated. This is a useful approach toward the top‐down fabrication of nonhomogeneous colloidal structures.

中文翻译：

将基于表面力的能垒连接到非均匀胶体结构，以从相同大小的纳米粒子种类的挥发性二元混合物中出现

纳米粒子能够自动排列成各种结构的能力及其独特的物理特性，使这些构建基块在广泛的应用和科学学科中至关重要。在这项工作中，随着电解质溶液载体的蒸发，证明了对由二元分散体出现的颗粒结构的控制，包括两种不同化学性质的相同尺寸的颗粒。通过改变溶液中的离子强度和pH值，可调节二元颗粒混合物中吸引和排斥表面力之间的平衡，即双电层，范德华力，疏水力和亲水力。因此，相应的势能垒被调整为彼此之间以及与下面的基质之间的颗粒附着，并改变微观颗粒结构中不同类型颗粒的纳米排列，这通过对流图形的形成而出现。因此，通过实现控制在纳米尺度上控制对微粒结构的图案形成的潜在能量贡献的物理机制，使得相同尺寸的颗粒的二元混合物的3D形态变得均匀，分层或相分离。这是自上而下制造非均匀胶体结构的有用方法。通过实现控制潜在能量对纳米级颗粒结构图案形成的物理机制，相同尺寸颗粒的二元混合物的3D形态变得均匀，分层或相分离。这是自上而下制造非均匀胶体结构的有用方法。通过实现控制潜在能量对纳米级颗粒结构图案形成的物理机制，相同尺寸颗粒的二元混合物的3D形态变得均匀，分层或相分离。这是自上而下制造非均匀胶体结构的有用方法。

更新日期：2020-09-16

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