Research On Surface Stress Of Azobenzene Under UV Light By Microcantilever Sensor Technology

Azobenzene polymers are photo responsive polymer materials with reversible cis-trans isomerism the most widely studied as class of photo responsive polymers;their special photo responsive properties make them useful in information storage,actuators,and surface activity.Agents and other fields have been widely used.Recently,some researchers have designed and manufactured an azobenzene polymer that can achieve solid-liquid transition under UV/Vis irradiation;the real-time changes in surface stress study promote azobenzene polymer in polymer processing,intelligent light driving,and surface the development of active agents and other fields is of great significance.However,the characteristics of solid-liquid transition also make it difficult to study surface stress changes.This paper uses microcantilever sensors to perform real-time changes in the surface stress of solid-liquid convertible azobenzene polymers.In this paper,the microcantilever modification device and the microcantilever sensing device are independently designed and constructed for the study of the surface stress of azobenzene polymer.The microcantilever beam modification device is mainly used to modify the azobenzene polymer on the surface of the microcantilever before the experiment for the experimental detection of the surface stress,and the research mainly achieves the final realization of the azobenzene polymer by changing the dissolution method and the modification method.Uniformly modified to lay the foundation for the reliability of experimental results.The microcantilever sensing device is mainly used to detect the deflection of the microcantilever in the real-time variation of the surface stress of the azobenzene polymer,and mainly includes three systems:an optical lever detection system,an ultraviolet/visible light switching system,and a temperature control system.The research mainly obtains the accuracy of the device through actual calibration and theoretical calculation.The temperature response test is used to verify the accuracy of the device and the temperature sensitivity of the experimental device is explored.The experimental results show that the device has good stability with an accuracy of 3.74nm and a temperature sensitivity of 0.12?.Using a microcantilever sensing device,an experimental investigation of the real-time changes in surface stress of solid-liquid convertible azobenzene polymers was conducted.The experiments were divided into three parts:the real-time change of surface stress during the solid-liquid transition of azobenzene under alternating irradiation of ultraviolet/visible light,the change of surface stress under continuous cyclic alternate irradiation,and the real-time change of surface stress under irradiation of different ultraviolet light intensity.Explore.According to the experimental data,the experimental results are analyzed and summarized.The results show that the change of the surface stress of the azobenzene polymer that can be transformed with solid and liquid shows the first decrease,then increase and then decrease to the equilibrium change under UV light,after visible light irradiation.Revert to the original state,and the surface stress changes show recyclable,light-affected results.The good repetitive cycle characteristics and the stronger the stronger the change in the light intensity,will make the solid-liquid changeable azobenzene polymer more widely used in the field of actuators and regulatable surfactants.At the end of this thesis,a brief summary and prospect of the device construction work and the research work on the properties of Azobenzene polymer are presented.