| Abstract [eng] |
The aim of the thesis is to investigate Young’s modulus and hydrophobicity of the PZT composite material for biosensor application. Piezoelectric materials are popular because of their ability to convert the biological, chemical or mechanical response to the electrical signal by using piezoelectric or piezoresistive effect. In this thesis, three different types of piezoelectric composite materials with polymer composition (PVB, PS, and PMMA) are investigated and displaying its mechanical properties such as Young’s modulus and Density. Also, simulation has been done using Comsol Multiphysics 5.0 software to verify the experimental results. Composite materials display the properties of the piezo effect that could be useful for the formation of microstructure on it. These microstructure can be used as innovative functional elements in a biomedical micro hydro-mechanical system such as microchannels. On the other hand, hydrophobicity plays an important role for biosensors which are working in the viscous (liquid) environment. Hydrophobicity investigation was done for PZT composite material (PVB, PS, and PMMA) with different liquids (Distilled water, Glycerine, Spirit, and Olive oil). For hydrophobicity identification of these PZT composite materials new experimental setup has been designed to measure contact angle, because Contact angle measurement is a convenient method for surface identification either it's hydrophobic or hydrophilic. Then by using image analysis software (ImageJ, DropSnake plugins) to analyze images to measure contact angle which is formed by liquid drops on PVB, PS, and PMMA composite surface. Moreover, the influence of different coating thickness of PZT composite material and different base materials on contact angle was investigated using same experiment platform. |
