Effect of Particle Interactions on the Assembly of Drying Colloidal Mixtures.
Effect of Particle Interactions on the Assembly of Drying Colloidal Mixtures.
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颗粒相互作用对干燥胶体混合物组装的影响。
DOI：
10.1021/acs.langmuir.1c03144
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发表时间：
2022-05-10
期刊：
影响因子：
3.9
通讯作者：
Martin-Fabiani, Ignacio
中科院分区：
文献类型：
--
作者：
Tinkler, James D.;Scacchi, Alberto;Argaiz, Maialen;Tomovska, Radmila;Archer, Andrew J.;Willcock, Helen;Martin-Fabiani, Ignacio
研究了颗粒相互作用对胶体混合物在干燥过程中尺寸分离和组装的影响。将阳离子表面活性剂添加到二元胶乳/二氧化硅胶体分散体中，该分散体已被证明在室温下干燥后会自我分层。原子力显微镜被用来表明，由于表面活性剂的存在，颗粒相互作用的变化降低了层化程度，在某些情况下，完全抑制了这种影响。含有较高表面活性剂浓度的胶体分散体可以经历完全的形态变化，从而形成由乳胶颗粒组成的装甲颗粒，其中包裹着较小的二氧化硅纳米颗粒。为了进一步证明装甲颗粒的产生和层化被抑制，用能量色散X射线光谱和共聚焦荧光显微镜产生了横截面图像。用动态光散射法测量了装甲颗粒的生长情况。为了补充这项研究，我们使用布朗动力学模拟来模拟干燥过程。通过调整粒子相互作用使其更具吸引力，模拟显示了装甲粒子的存在，并阻碍了尺寸分离过程。防止分离也会提高胶体膜的透明度。总体而言，这项研究证明了胶体混合物干燥过程中颗粒相互作用和尺寸分离之间存在联系，并为使用极其简单的方法控制不同薄膜结构的组装提供了有价值的工具。
The effects of particle interactions on the size segregation and assembly of colloidal mixtures during drying were investigated. A cationic surfactant was added to a binary latex/silica colloidal dispersion that has been shown to self-stratify upon drying at room temperature. Atomic force microscopy was used to show that the change in particle interactions due to the presence of surfactants reduced the degree of stratification and, in some cases, suppressed the effect altogether. Colloidal dispersions containing higher surfactant concentrations can undergo a complete morphology change, resulting instead in the formation of armored particles consisting of latex particles coated with smaller silica nanoparticles. To further prove that armored particles are produced and that stratification is suppressed, cross-sectional images were produced with energy-dispersive X-ray spectroscopy and confocal fluorescence microscopy. The growth of armored particles was also measured using dynamic light scattering. To complement this research, Brownian dynamics simulations were used to model the drying. By tuning the particle interactions to make them more attractive, the simulations showed the presence of armored particles, and the size segregation process was hindered. The prevention of segregation also results in enhanced transparency of the colloidal films. Overall, this research proves that there is a link between particle interactions and size segregation in drying colloidal blends and provides a valuable tool to control the assembly of different film architectures using an extremely simple method.
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影响因子：
5
作者：
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通讯作者：
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