本文選題：膠體晶體　切入點：溫度測控　出處：《浙江理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：自組裝是一種很好的利用微納米粒子構(gòu)建有序微結(jié)構(gòu)的方法,隨著納米技術(shù)的發(fā)展而出現(xiàn)并越來越受到人們的重視。膠體自組裝獲取有序結(jié)構(gòu)的方法不依靠人力就可以完成,方法簡便、制造結(jié)構(gòu)多樣、重復(fù)性好,已經(jīng)在物理、化學(xué)、生物、材料、醫(yī)藥等領(lǐng)域得到了廣泛的應(yīng)用。主要的自組裝方法包括模板法、無模板法、外場定向法和其他物理方法等。其中,PS膠體在平面基片上蒸發(fā)溶劑法自組裝因其簡單的操作方法而應(yīng)用最為廣泛。已知的影響蒸發(fā)溶劑法自組裝結(jié)果的因素主要是溶劑的蒸發(fā)速度、組裝環(huán)境的溫度和PS溶液的濃度,溶劑蒸發(fā)法自組裝對組裝環(huán)境溫度變化、溶液濃度、環(huán)境濕度敏感,組裝得到的晶體薄膜的質(zhì)量直接由這些因素決定,因此很難控制晶體薄膜的厚度和結(jié)晶有序度,所以非常有必要對這些因素對膠體晶體生長的影響規(guī)律進(jìn)行研究。本論文首先研究了對PS膠體自組裝環(huán)境的溫度控制,然后研究了密封方式、環(huán)境溫度、溶液濃度對膠體晶體周期性常數(shù)和完整性的影響規(guī)律,主要工作內(nèi)容和取得的成果歸納如下:1、完成了基于FPGA和SHT20的溫度測控系統(tǒng)設(shè)計:首先,采用自頂向下的方案設(shè)計了系統(tǒng)框架;然后進(jìn)行PID控制器和測控系統(tǒng)其他各個模塊的設(shè)計和仿真驗證;最后經(jīng)過工程的方法整定了PID參數(shù),使控制精度達(dá)到0.1℃。2、推導(dǎo)了光子帶隙中心波長值與膠體晶體中PS微球填充率、PS微球粒徑之間的關(guān)系公式。利用設(shè)計的溫度測控系統(tǒng),采用平面基片蒸發(fā)溶劑法在不密封、密封、有水密封三種環(huán)境密封方式下進(jìn)行自組裝獲得PS膠體晶體薄膜。利用掃描電鏡獲取膠體晶體的表面影像,利用紫外-可見光譜儀對光學(xué)性能進(jìn)行分析和研究。分析不同密封條件下PS膠粒在自組裝過程中的行為機(jī)理,得出密封條件造成的溶劑蒸發(fā)速度變化對組裝所得膠體晶體結(jié)構(gòu)形貌和光學(xué)性能的影響規(guī)律。3、在組裝效果最好的帶水密封環(huán)境中,進(jìn)行不同溫度條件下不同濃度的PS溶液在平面基片蒸發(fā)溶劑法自組裝實驗。分別分析組裝溫度、PS溶液濃度兩個因素對膠粒在組裝過程中的行為機(jī)理的影響,探究對膠體晶體形貌、結(jié)構(gòu)特征,光子晶體周期性常數(shù)、填充率以及完整性的影響規(guī)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，

本文編號：1602305