溶剂处理法制备规整排列的非球形结构
发布时间：2018-10-09 20:52
【摘要】：规整排列的碗状阵列结构在光学,微反应器等方面有广泛的运用,不过目前的问题是碗状阵列的取向性不容易控制,用传统的自组装方法并不能很好的实现取向的均一,所以用简便通用的方法获得规整取向的碗状阵列一直是人们的研究重点。规整排列的异形粒子,比如规整排列的形状各异的Janus粒子,在光学性能方面与一般的球形粒子相比,有可能获得完全的光子禁带,或是用于制备光学器件如纳米透镜等,所以也引起了人们的广泛关注,不过这种粒子的排列更为困难,如果借助外场则会对微球和运用条件方面有诸多限制,所以如何能简便的控制取向和形貌也是大家关注的热点。本文通过分散聚合两步法先制备出PS-DVB核壳微球,再利用注射器法使微球在水面规整的排列,然后将规整排列的核壳微球进行溶剂处理,通过调控处理条件和球的性质就可以获得规整排列的纳米碗结构或异形粒子结构。本文方法的特点是操作简便,结果重复性好,并且用类似的操作可以得到规整排列的碗状阵列或规整排列的异形粒子,取向性的问题也能很好的解决。在制备微球的过程中,通过控制加料时间、加入二乙烯基苯的含量、加入过硫酸铵和甲基丙烯酸甲酯的含量,可以对PS-DVB核壳微球的表面的疏水性、微球的凝胶含量及壳层厚度进行控制,通过对反应介质极性的改变,也可以对微球的粒径进行调控,这些在制备球过程中调控的因素在后面对球的形貌的控制方面有重要的作用。在溶剂处理的过程中,通过对球的凝胶含量、球的表面疏水性、溶剂处理时间和溶剂处理类型等因素的控制,可以控制球的变形结果,并对球的形貌进行调控。凝胶含量较低、壳层较薄的样品可以很容易的获得规整排列的纳米碗状阵列,纳米碗的深度和形貌也可以通过处理时间和溶剂类型进行调控;球表面疏水性较小、凝胶含量较低的样品可以比较容易获得规整排列的异形粒子阵列,通过对球的疏水性的大小和处理溶剂的调控,也可以对异形粒子阵列的形貌进行调控。
[Abstract]:Structured bowl arrays are widely used in optics, microreactors and so on. However, the problem is that the orientation of bowl arrays is not easy to control, and the traditional self-assembly method is not able to achieve uniformity of orientation. Therefore, it is always the focus of research to obtain the bowl-shaped array with regular orientation by a simple and universal method. Irregular particles, such as structured Janus particles of different shapes, have the possibility of obtaining complete photonic bandgap compared with normal spherical particles in terms of optical properties, or used to fabricate optical devices such as nanophones. So people pay more attention to this kind of particles, but it is more difficult to arrange the particles. If the outside field is used, there will be a lot of restrictions on the microspheres and application conditions, so how to easily control the orientation and morphology is also the focus of attention. In this paper, PS-DVB core-shell microspheres were prepared by two steps of dispersion polymerization, then the microspheres were arranged on the surface of water by injector method, and then the core-shell microspheres were treated with solvent. By adjusting the treatment conditions and the properties of the ball, we can obtain the structured nano-bowl structure or the special-shaped particle structure. The characteristic of this method is that it is easy to operate and the results are reproducible, and the problem of orientation can be solved well by using the similar operation to obtain regular bowl arrays or irregular particles. In the process of preparing microspheres, the hydrophobicity of PS-DVB core-shell microspheres can be improved by controlling the feeding time, adding the content of divinylbenzene, adding ammonium persulfate and methyl methacrylate. The gel content and shell thickness of the microspheres can be controlled by changing the polarity of the reaction medium, and the particle size of the microspheres can also be controlled. These factors play an important role in controlling the morphology of the spheres. In the process of solvent treatment, by controlling the gel content, surface hydrophobicity, solvent treatment time and the type of solvent treatment, the deformation of the ball can be controlled, and the morphology of the ball can be controlled. The gel content is low, the shell layer thin sample can easily obtain the regular arrangement of the nano-bowl array, the depth and morphology of the nano-bowl can also be controlled by the treatment time and the type of solvent, the hydrophobicity of the spherical surface is relatively small, It is easy to obtain irregular particle arrays with low gel content. The morphology of irregular particle arrays can also be controlled by controlling the hydrophobicity of the spheres and the treatment solvent.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O734
，
本文编号：2260750
[Abstract]:Structured bowl arrays are widely used in optics, microreactors and so on. However, the problem is that the orientation of bowl arrays is not easy to control, and the traditional self-assembly method is not able to achieve uniformity of orientation. Therefore, it is always the focus of research to obtain the bowl-shaped array with regular orientation by a simple and universal method. Irregular particles, such as structured Janus particles of different shapes, have the possibility of obtaining complete photonic bandgap compared with normal spherical particles in terms of optical properties, or used to fabricate optical devices such as nanophones. So people pay more attention to this kind of particles, but it is more difficult to arrange the particles. If the outside field is used, there will be a lot of restrictions on the microspheres and application conditions, so how to easily control the orientation and morphology is also the focus of attention. In this paper, PS-DVB core-shell microspheres were prepared by two steps of dispersion polymerization, then the microspheres were arranged on the surface of water by injector method, and then the core-shell microspheres were treated with solvent. By adjusting the treatment conditions and the properties of the ball, we can obtain the structured nano-bowl structure or the special-shaped particle structure. The characteristic of this method is that it is easy to operate and the results are reproducible, and the problem of orientation can be solved well by using the similar operation to obtain regular bowl arrays or irregular particles. In the process of preparing microspheres, the hydrophobicity of PS-DVB core-shell microspheres can be improved by controlling the feeding time, adding the content of divinylbenzene, adding ammonium persulfate and methyl methacrylate. The gel content and shell thickness of the microspheres can be controlled by changing the polarity of the reaction medium, and the particle size of the microspheres can also be controlled. These factors play an important role in controlling the morphology of the spheres. In the process of solvent treatment, by controlling the gel content, surface hydrophobicity, solvent treatment time and the type of solvent treatment, the deformation of the ball can be controlled, and the morphology of the ball can be controlled. The gel content is low, the shell layer thin sample can easily obtain the regular arrangement of the nano-bowl array, the depth and morphology of the nano-bowl can also be controlled by the treatment time and the type of solvent, the hydrophobicity of the spherical surface is relatively small, It is easy to obtain irregular particle arrays with low gel content. The morphology of irregular particle arrays can also be controlled by controlling the hydrophobicity of the spheres and the treatment solvent.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O734
，
本文编号：2260750
本文链接：https://www.wllwen.com/kejilunwen/huaxue/2260750.html
教材专著
