有序微納結(jié)構(gòu)材料的制備及其對(duì)細(xì)胞的作用研究
[Abstract]:The interaction between cells and nanomaterials is one of the most important issues in the field of material science. The physical and chemical properties of materials play an important role in regulating cell behavior, and then affect cell adhesion, proliferation, migration and differentiation. In general, the surface properties of materials can be divided into chemical and physical properties. Modification of the surface of the material with chemical groups can change the adhesion behavior of the cells, but the cell growth environment is still confined to the two-dimensional plane. Physical modification can not only regulate the behavior of cell adhesion, but also provide a three-dimensional environment for cell culture. At present, the methods to change the physical morphology of materials are self-assembly, electron beam etching, nano-imprint and so on. In recent years, self-assembly and photolithography techniques have been widely used in the field of cell culture because they can be used to fabricate multi-size and multi-functional microstructures in the range of microscale and nano-scale. In this paper, two-dimensional and three-dimensional ordered micro-nano structure materials were constructed by self-assembly and photolithography, and used in cell culture. The main contents of the study are as follows: (1) the micro-nano porous ordered structure materials were prepared by the self-assembly method, and then the ordered structure materials with pore deformation were obtained by drawing. Through cell culture, it was found that the pore morphology induced the cell morphology and cell alignment, and the different stretching times induced the cell orientation. The higher the stretching ratio, the more obvious the cell orientation was. On this basis, the adhesion and orientation behavior of the cells were regulated simultaneously by the gel modification of the ordered structure materials with different pore morphology. This material is expected to be anisotropic tissue such as myocardium. The study of blood vessels provides a new method. (2) the method of preparing ordered structure materials based on step stretching method is proposed, by drawing different times of the same material in different regions. A series of ordered structure materials with different pore morphology were obtained. On the basis of this method, the ordered structure materials with gradual pore morphology were obtained, and the cellular experiments showed that the tendon cells were disordered to orderly arranged on the surface of the gradients. This gradual arrangement of cells provides a basis for future research on joint junctions in the field of tissue engineering. (3) based on the method of horizontal contact exposure combined with bidirectional exposure, the ordered meshed hollow fibers are obtained. Cell experiments showed that the cells could form dense layers around the tubular structure, and then the drug loaded functional fibers were obtained through the drug gel perfusion of hollow fibers, and the effects of functional fibers on the surface adhesion cells were discussed. In addition, a fiber network scaffold with single inlet and multiple outlets was designed and prepared. The hollow fiber and its fiber network with penetrating channels and through the tube wall are expected to be applied in the fields of three-dimensional perfusion cell culture and drug delivery.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:R318.08
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