PS胶体自组装测控系统设计及组装工艺研究

发布时间：2018-03-12 16:12

  本文选题：胶体晶体　切入点：温度测控　出处：《浙江理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：自组装是一种很好的利用微纳米粒子构建有序微结构的方法,随着纳米技术的发展而出现并越来越受到人们的重视。胶体自组装获取有序结构的方法不依靠人力就可以完成,方法简便、制造结构多样、重复性好,已经在物理、化学、生物、材料、医药等领域得到了广泛的应用。主要的自组装方法包括模板法、无模板法、外场定向法和其他物理方法等。其中,PS胶体在平面基片上蒸发溶剂法自组装因其简单的操作方法而应用最为广泛。已知的影响蒸发溶剂法自组装结果的因素主要是溶剂的蒸发速度、组装环境的温度和PS溶液的浓度,溶剂蒸发法自组装对组装环境温度变化、溶液浓度、环境湿度敏感,组装得到的晶体薄膜的质量直接由这些因素决定,因此很难控制晶体薄膜的厚度和结晶有序度,所以非常有必要对这些因素对胶体晶体生长的影响规律进行研究。本论文首先研究了对PS胶体自组装环境的温度控制,然后研究了密封方式、环境温度、溶液浓度对胶体晶体周期性常数和完整性的影响规律,主要工作内容和取得的成果归纳如下:1、完成了基于FPGA和SHT20的温度测控系统设计:首先,采用自顶向下的方案设计了系统框架;然后进行PID控制器和测控系统其他各个模块的设计和仿真验证;最后经过工程的方法整定了PID参数,使控制精度达到0.1℃。2、推导了光子带隙中心波长值与胶体晶体中PS微球填充率、PS微球粒径之间的关系公式。利用设计的温度测控系统,采用平面基片蒸发溶剂法在不密封、密封、有水密封三种环境密封方式下进行自组装获得PS胶体晶体薄膜。利用扫描电镜获取胶体晶体的表面影像,利用紫外-可见光谱仪对光学性能进行分析和研究。分析不同密封条件下PS胶粒在自组装过程中的行为机理,得出密封条件造成的溶剂蒸发速度变化对组装所得胶体晶体结构形貌和光学性能的影响规律。3、在组装效果最好的带水密封环境中,进行不同温度条件下不同浓度的PS溶液在平面基片蒸发溶剂法自组装实验。分别分析组装温度、PS溶液浓度两个因素对胶粒在组装过程中的行为机理的影响,探究对胶体晶体形貌、结构特征,光子晶体周期性常数、填充率以及完整性的影响规律。
[Abstract]:Self-assembly is a good method to construct ordered microstructures by using microparticles. With the development of nanotechnology, people pay more and more attention to it. It has been widely used in the fields of physics, chemistry, biology, materials, medicine and so on. The main self-assembly methods include template method, no template method, no template method, etc. The external field orientation method and other physical methods are used. The PS colloid is widely used in the evaporation solvent self-assembly on the flat substrate because of its simple operation method. The known factors affecting the self-assembly result of the evaporative solvent method are the main factors. It's the evaporation rate of the solvent, The temperature of the assembly environment and the concentration of PS solution, the solvent evaporation self-assembly is sensitive to the temperature of the assembly environment, the concentration of the solution, the humidity of the environment, the quality of the crystal film is directly determined by these factors. Therefore, it is difficult to control the thickness and orderliness of crystalline films, so it is necessary to study the influence of these factors on the growth of colloidal crystals. Then, the effects of sealing mode, ambient temperature and solution concentration on the periodic constant and integrity of colloidal crystal are studied. The main work contents and achievements are summarized as follows: 1. The design of temperature measurement and control system based on FPGA and SHT20 is completed. The system framework is designed by the top-down scheme, and then the PID controller and other modules of the measurement and control system are designed and simulated. Finally, the PID parameters are adjusted by the engineering method. The control accuracy reaches 0.1 鈩，

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