Nonlinear Viscoelasticity of Highly Ordered, Two-Dimensional Assemblies of Metal Nanoparticles Confined at the Air/Water Interface.
Nonlinear Viscoelasticity of Highly Ordered, Two-Dimensional Assemblies of Metal Nanoparticles Confined at the Air/Water Interface.
复制标题
限制在空气/水界面的高度有序、二维金属纳米颗粒组件的非线性粘弹性
DOI：
10.1021/acs.langmuir.8b02713
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Tanaka
中科院分区：
文献类型：
--
作者：
S. Masuda;S. Mielke;F. Amadei;A. Yamamoto;P. Wdaang;T. Taniguchi;K. Yoshikawa; K. Tama;M. Tanaka
在这项研究中，我们用膨胀流变学的方法研究了金属纳米颗粒单分子膜在空气/水界面的粘弹性。用油胺覆盖的金纳米颗粒在朗缪尔膜天平上形成了稳定、致密的单分子膜。首先利用经典的Kelvin-Voigt模型分析了纳米颗粒单分子膜的应力响应函数，得到了弹性常数和粘度。所获得的结果表明，纳米颗粒的单层主要是弹性的，形成了二维物理凝胶。由于信号的整体形状表现出明显的非线性，我们进一步分析了傅立叶级数展开中高阶模式的数据。高阶振型信号的虚部比实部强，表明耗散项是引起非线性的主要原因。有趣的是，在较大应变幅度下测量的响应函数变得不对称，并伴随着偶数模式的出现。通过计算平均力势，定量评估了纳米颗粒之间相互作用的重要性，表明横向关联可以达到远大于颗粒直径的距离。用部分氟化的硫代烷基硫酸酯包裹的金纳米粒子和肉豆蔻酸包裹的银纳米粒子也考察了表面化学功能和核心金属的影响。扩张流变学和相关分析的结合可以帮助我们通过精细可调的局部表面等离子体共振来精确控制金属纳米颗粒的二维胶体组装。
In this study, we investigated the viscoelastic properties of metal nanoparticle monolayers at the air/water interface by dilational rheology under periodic oscillation of surface area. Au nanoparticles capped with oleylamine form a stable, dense monolayer on a Langmuir film balance. The stress response function of a nanoparticle monolayer was first analyzed using the classical Kelvin–Voigt model, yielding the spring constant and viscosity. The obtained results suggest that the monolayer of nanoparticles is predominantly elastic, forming a two-dimensional physical gel. As the global shape of the signal exhibited a clear nonlinearity, we further analyzed the data with the higher modes in the Fourier series expansion. The imaginary part of the higher mode signal was stronger than the real part, suggesting that the dissipative term mainly causes the nonlinearity. Intriguingly, the response function measured at larger strain amplitude became asymmetric, accompanied by the emergence of even modes. The significance of interactions between nanoparticles was quantitatively assessed by calculating the potential of mean force, indicating that the lateral correlation could reach up to the distance much larger than the particle diameter. The influence of surface chemical functions and core metal has also been examined by using Au nanoparticles capped with partially fluorinated alkanethiolate and Ag nanoparticles capped with myristic acid. The combination of dilational rheology and correlation analyses can help us precisely control two-dimensional colloidal assembly of metal nanoparticles with fine-adjustable localized surface plasmon resonance.
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