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首页> 美国卫生研究院文献>Nanomaterials >Micromechanical Properties of Nanostructured Clay-Oxide Multilayers Synthesized by Layer-by-Layer Self-Assembly
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Micromechanical Properties of Nanostructured Clay-Oxide Multilayers Synthesized by Layer-by-Layer Self-Assembly

机译：层状自组装合成纳米结构粘土氧化物多层复合材料的微机械性能

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摘要

Clay-based nanostructured multilayers, such as clay-polymer multilayers and clay-oxide multilayers, have attracted growing attention owing to their remarkable mechanical properties and promising application in various fields. In this paper, synthesis of a new kind of nanostructured clay-oxide multilayers by layer-by-layer self-assembly was explored. Nano-mechanical characterization of 18 clay-based multilayer samples, prepared under as-deposited (i.e., air-dried) and annealing conditions at 400 °C/600 °C with different precursor cations and multilayer structure, were carried out using nanoindentation testing, atomic force microscopy (AFM), and X-ray diffraction (XRD). The influencing factors, including as-deposited and annealing conditions and clay concentrations on the mechanical properties were analyzed. Results show that all of the multilayers exhibit high bonding strength between interlayers. Higher modulus and hardness of clay-based multilayers were obtained with lower clay concentrations than that with higher clay concentrations. Different relationships between the modulus and hardness and the annealing temperature exist for a specific type of clay-oxide multilayer. This work offers the basic and essential knowledge on design of clay-based nanostructured multilayers by layer-by-layer self-assembly.
机译：粘土基纳米结构多层，例如粘土聚合物多层和粘土氧化物多层，由于其卓越的机械性能和在各个领域的应用前景而备受关注。本文研究了一种通过层间自组装合成新型纳米结构粘土氧化物多层膜的方法。使用纳米压痕测试对18种粘土基多层样品进行了纳米力学表征，这些样品是在沉积（即风干）条件下和在400°C / 600°C退火条件下制备的，具有不同的前体阳离子和多层结构。原子力显微镜（AFM）和X射线衍射（XRD）。分析了沉积条件，退火条件和黏土浓度对力学性能的影响。结果表明，所有的多层在中间层之间都表现出高的粘结强度。与较低的粘土浓度相比，较低的粘土浓度可获得较高的模量和硬度。对于特定类型的粘土氧化物多层，在模量和硬度与退火温度之间存在不同的关系。这项工作提供了通过逐层自组装设计基于粘土的纳米结构多层的基础知识。

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