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Mechanical Properties of Organic/Inorganic Nanoscale Lamelleted Composite Thin Flims

Author: TanHaiFeng
Tutor: ZhangBin
School: Northeastern University
Course: Materials Science
Keywords: PE/TiO2nanocomposite multilayer layer by layer (LBL) self-assembly chemical bath deposition (CBD) mechanical properties
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Type: Master's thesis
Year: 2012
Downloads: 4
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Abstract


Shells, especially the nacre in the shells, have extremely outstanding mechanical properties which have attracted much attention. The investigations of the shells have shown that the excellent mechanical properties derive from their unique "brick-and-mortar-like" structures. In order to simulate or copy the unique structure, PE/TiO2nanocomposite multilayer films were prepared and the mechanical behavior was also investigated.Layer by layer (LBL) self-assembly and chemical bath deposition (CBD) methods were carried out to prepare PE/TiO2nanocomposite multilayer films on (100)-oriented Si substrates. The process parameters for deposition of PE/TiO2nanocomposite multilayers were investigated systematically. The surface morphologies, compositions and the microstructures of the PE/TiO2multilayers were characterized by LSCM, SEM and TEM/HRTEM. Mechanical properties of the nano-multilayer films were studied using micro-indentation, nano-indentation and the simply supported beam bending devices. Conculsions can be drawn as follows:(1) LBL and CBD methods have been used successfully to prepare PE/TiO2nanocomposite multilayer films on (100)-oriented Si substrate. The as-prepared multilayer films have lamelleted structures in which the interfacials between the organic layers and the inorganic layers play an important role in resisting the crack growth.(2) The minerals bridges were formed and observed between the organic layers and the inorganic layers through TEM and HRTEM when the cycles of organic poly electrolysis (PAH/PSS) was twice. Crack deflection was observed on the interface of the organic layer and inorganic layer; Inorganic layers consist of amorphous TiO2and a part of nanocrystalline TiO2. The grain size of the nanocrystalline TiO2is about5nm.(3) The hardness and the Young’s modulus of the composite films have the rising tendency with the increasing of the thickness ratio of the TiO2/PE, while the fracture toughness of the films decrease accordingly. (4) Rapture work of the nanocomposite films whose organic layers circulation is PEI/PSS/(PAH/PSS)3was measured using simply supported beam bending method, and the value of the fracture energy was1.02J·m-2through calculations.

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