The Fabrication And Studies On Polymeric Core-shell Microsphere By Using Synchrotron Radiation

For the advantages of X-ray microscopy techniques about high spatial resolution, high penetrability, rich contrast mechanism and the linear absorption, X-ray microscopy techniques can analyze the different substructures of the objects. It is a suitable tool for the dynamic non-destruction measurement on polymeric core-shell microspheres. The new techniques in X-ray microscopy and nano-CT were introduced to get the three dimensional distribution and the slice pictures of the polymeric core-shell microsphere. Meanwhile, synchrotron radiation infrared micro spectroscopy is suitable for the high sensitivity microanalysis on the components of polymer microspheres. It is not only a conventional infrared micro spectroscopy, which has the advantages such as high sensitivity, short time and no destroying. The high brightness of synchrotron radiation source makes it get the arbitrary micro components information of the core-shell microspheres. According to the structural features of the polymeric core-shell microspheres, the thesis use X-ray microscopy techniques and synchrotron radiation infrared micro spectroscopy to analyze the structure and the components of the micro reactor, and verify the feasibility of this test method.The main works in the thesis are described as the following:1. This chapter summarized the concept of micro reactor and the concept of micro fluidic chips. Analyzed the application advantages, the present situation and the development prospect of micro reactor and micro fluidic chips in biochemistry and other areas, expounded the existing problems of the two technologies respectively, and expounded the whitespace between them. Based on the current rapid development requirement of micro reactor in chemical and biological engineering, it is our immediate needs to development a new technology.2. The chapter described the fabrication of polymeric core-shell microspheres. We used the coaxial capillary microfludic device to fabricate the polymeric core-shell microspheres and made it a micro reactor. We used the UV-light to initiate polymerization, and used the ⁶⁰Co gamma ray to complete the reaction inside the reactor. The devices used throughout the experimental process are simple, inexpensive, accurate, uniform and easy encapsulation.3. The chapter descripts the fabrication of polymeric core-shell microspheres. We used the coaxial capillary microfludic device to fabricate the polymeric core-shell microspheres and made it a micro reactor. We used the UV-light to initiate polymerization, and used the ⁶⁰Co gamma ray to complete the reaction inside the reactor. The device used throughout the experimental process is simple, inexpensive, accurate, uniform and easy encapsulation. A variety of morphology inside the polymeric core-shell microspheres was observed, and the possible optimized parameters are given. Meanwhile, a lot of iron is detected; it should be elemental iron or iron oxide due to the 60nm spatial resolution of TXM.4. The composition of the core material has been studied by using synchrotron radiation infrared microspectroscopy. The high brightness advantage of synchrotron radiation infrared microspectroscopy was used to analyze the arbitrary microarea of polymeric core-shell microspheres, and the difference between the three iron oxidesα- Fe₂O₃,γ-Fe₂O₃ and Fe₃O₄ was observed. We identified this material isγ-Fe₂O₃. We also identified that the reaction process of the irradiation and oxidation.