Amphiphile-Induced Anisotropic Colloidal Self-Assembly.

Amphiphile-Induced Anisotropic Colloidal Self-Assembly.
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两亲物诱导的各向异性胶体自组装。

DOI:
10.1021/acs.langmuir.8b01382
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发表时间:
2018
期刊:
the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Rey M
Rey M
中科院分区:
--
文献类型:
--
作者:
Rey M

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球形胶体颗粒通常在吸附于液体界面时自组装成六边形晶格。更复杂的组装结构,包括粒子链和具有正方形对称性的相位,在大约20年前就已经被理论预测为通过软排斥肩相互作用的球形粒子。在这里,我们证明,这种复杂的组装相可以通过实验实现与球形胶体颗粒组装在空气/水界面的分子两亲物的存在下。我们研究了两亲分子存在下胶体粒子在朗缪尔槽中的界面行为。我们将在界面处形成的结构转移到固体基底上,同时连续压缩,这使我们能够将占主导地位的组装相关联为可用界面面积的函数。我们观察到,嵌段共聚物与胶体颗粒的化学性质相似,以及表面活性蛋白牛血清白蛋白,直接胶体颗粒进入复杂的组装阶段,包括链和方形排列。观察到的结构再现的最小能量计算的硬核软肩粒子与实验现实的相互作用参数。从实验和理论之间的协议,我们假设,两亲物的存在操纵的胶体粒子的相互作用潜力。球形胶体颗粒在固体基底上组装成复杂的组装相,通过丰富可用于胶体光刻的可能结构库,为表面图案化开辟了新的可能性。
Spherical colloidal particles typically self-assemble into hexagonal lattices when adsorbed at liquid interfaces. More complex assembly structures, including particle chains and phases with square symmetry, were theoretically predicted almost two decades ago for spherical particles interacting via a soft repulsive shoulder. Here, we demonstrate that such complex assembly phases can be experimentally realized with spherical colloidal particles assembled at the air/water interface in the presence of molecular amphiphiles. We investigate the interfacial behavior of colloidal particles in the presence of different amphiphiles on a Langmuir trough. We transfer the structures formed at the interface onto a solid substrate while continuously compressing, which enables us to correlate the prevailing assembly phase as a function of the available interfacial area. We observe that block copolymers with similarities to the chemical nature of the colloidal particles, as well as the surface-active protein bovine serum albumin, direct the colloidal particles into complex assembly phases, including chains and square arrangements. The observed structures are reproduced by minimum energy calculations of hard core–soft shoulder particles with experimentally realistic interaction parameters. From the agreement between experiments and theory, we hypothesize that the presence of the amphiphiles manipulates the interaction potential of the colloidal particles. The assembly of spherical colloidal particles into complex assembly phases on solid substrates opens new possibilities for surface patterning by enriching the library of possible structures available for colloidal lithography.
方形胶体晶体的界面聚合物相分离与自组装
DOI: --
发表时间: 2012
期刊:
影响因子: --
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