中性红预胶束自组装体系的性能研究

发布时间：2018-11-11 16:12

【摘要】：材料对人们生产生活有着革命性的引领作用,因此材料的研究越来越热,尤其自组装材料和智能材料是近几年研究的热点内容。自组装避免了复杂的有机合成,智能材料对环境起一定的感知、反应、自调节作用,这些不剧烈的、缓慢的、柔和的反应,更接近于生命的生理过程,具有很大的研究前景和价值。预胶束和胶束也属于自组装的范畴,但人们却对预胶束的领域研究很少,尤其是在国内。预胶束作为胶束形成之前的一个状态,对环境的变化敏感而且做出响应,各项性能都与胶束有很大差异,都有待探讨。本文致力于研究荧光试剂与表面活性剂各浓度比例下的自组装,主要探讨预胶束浓度范围内自组装和智能响应。通过高分辨率透射电子显微镜、紫外-可见吸收光谱、荧光发射光谱、荧光寿命、电化学循环伏安法等多种手段探究荧光试剂中性红分别与表面活性剂十二烷基磺酸钠、十二烷基苯磺酸钠混合时的形貌,光谱性能以及对外界环境的响应能力,得出一系列相关结论。具体研究工作包括以下几个方面:1、本文研究了中性红在碱性条件下稍高的浓度范围内,通过紫外-可见吸收光谱、荧光发射光谱、超高分辨透射电子显微镜多种手段探讨其自组装行为。中性红在中性和碱性环境中,大量转化为中式型体,该型体疏水性强,因此发生自我聚集和组装的能力大大增强,在疏水性、π-π堆积等多种分子间作用力的协同作用下,发生自组装,且加热也不能使这种组装逆转,因此,中性红对酸碱的响应很灵敏,在碱性环境中自组装能力很强。2、本文研究了中性红与十二烷基磺酸钠的自组装体系,且比例不同可以形成不同的形貌:沉淀、囊泡、胶束。探讨比例、浓度等多方面因素对体系光谱性能的影响,并首次用超高分辨透射电子显微镜观察了此种自组装体系的微观形貌,利用循环伏安表征该体系的氧化还原性能,同时也探讨了此自组装体系对pH、温度和金属离子的响应。3、本文研究了中性红与十二烷基苯磺酸钠的自组装体系,比例不同可以形成不同的形貌:沉淀、纤维、胶束。和中性红与十二烷基磺酸钠形成对比,中性红与十二烷基苯磺酸钠发生自组装主要通过疏水作用力诱导、π-π堆积和静电的影响,比中性红和十二烷基磺酸钠的结合力强,因此体系更稳定。也探讨比例、浓度等多方面因素对体系光谱性能的影响、并用超高分辨透射电子显微镜观察了此种自组装体系的微观形貌,利用循环伏安表征该体系的氧化还原性能,也研究了自组装体系对金属离子、p H和温度的响应。4、本文合成了中性红和十二烷基磺酸钠浓度较浓时形成的凝胶体系。探究此凝胶体系形成的最佳条件,例如浓度配比、pH、温度、盐、表面活性剂种类等,并进行了机理探讨即依靠静电作用、氢键、链的缠绕形成的非永久性的热可逆凝胶,对研究凝胶材料和制作凝胶与智能材料奠定一定的理论基础。
[Abstract]:Materials have a revolutionary leading role in people's production and life, so the research of materials is becoming more and more hot, especially self-assembled materials and smart materials are hot topics in recent years. Self-assembly avoids complex organic synthesis, smart materials have a certain sense, reaction, self-regulation of the environment, these nonviolent, slow, soft reactions are closer to the physiological processes of life. It has great research prospect and value. Premicelles and micelles also belong to the category of self-assembly, but there are few researches on premicelles, especially in China. As a state before micelle formation, premicelles are sensitive to and responsive to environmental changes. The properties of premicelles are very different from those of micelles, which need to be discussed. In this paper, the self-assembly of fluorescent reagents and surfactants at different concentrations is studied, and the self-assembly and intelligent response in the concentration range of premicelle are mainly discussed. Fluorescence reagent neutral red and surfactant sodium dodecyl sulfonate were investigated by means of high resolution transmission electron microscope, UV-Vis absorption spectrum, fluorescence emission spectrum, fluorescence lifetime, electrochemical cyclic voltammetry, etc. The morphology, spectral properties and responsiveness to the environment of sodium dodecylbenzene sulfonate were studied and a series of conclusions were obtained. The specific research work includes the following aspects: 1. In this paper, we have studied the fluorescence emission spectrum of neutral red in the range of slightly higher concentration under alkaline condition through UV-Vis absorption spectrum, The self-assembly behavior of ultrahigh resolution transmission electron microscope (UHTEM) was investigated by various means. Neutral red is transformed into Chinese type in neutral and alkaline environment, which has strong hydrophobicity, so the ability of self-aggregation and assembly is greatly enhanced by the synergistic action of hydrophobicity, 蟺-蟺 stacking and other intermolecular forces. Self-assembly occurs, and heating can not reverse the assembly. Therefore, neutral red is sensitive to acid-base and has strong self-assembly ability in alkaline environment. 2. The self-assembly system of neutral red and sodium dodecyl sulfonate has been studied in this paper. And different proportion can form different morphology: precipitate, vesicle, micelle. The effects of various factors, such as ratio and concentration, on the spectral properties of the system were discussed. The micromorphology of the self-assembled system was observed by ultrahigh resolution transmission electron microscope for the first time, and the redox properties of the system were characterized by cyclic voltammetry. At the same time, the response of the self-assembly system to pH, temperature and metal ions is also discussed. 3. The self-assembly system of neutral red and sodium dodecylbenzene sulfonate has been studied in this paper. Different proportions can form different morphologies: precipitate, fiber and micelle. In contrast with neutral red and sodium dodecyl sulfonate, the self-assembly of neutral red and sodium dodecyl benzene sulfonate is mainly induced by hydrophobic force, 蟺-蟺 accumulation and electrostatic effect, which is stronger than that of neutral red and sodium dodecyl sulfonate. As a result, the system is more stable. The effects of various factors, such as ratio and concentration, on the spectral properties of the system were also discussed. The micro-morphology of the self-assembled system was observed by ultrahigh resolution transmission electron microscope, and the redox performance of the system was characterized by cyclic voltammetry. The response of the self-assembled system to, p H and temperature of metal ions was also studied. 4 the gel system of neutral red and sodium dodecyl sulfonate was synthesized when the concentration of neutral red and sodium dodecyl sulfonate was high. The optimum conditions for the formation of this gel system, such as concentration ratio, pH, temperature, salt, surfactant species and so on, were investigated. The mechanism of the formation of the non-permanent thermoreversible gel by electrostatic interaction, hydrogen bond and chain winding was discussed. It lays a theoretical foundation for the study of gel materials and the manufacture of gel and smart materials.
【学位授予单位】：河南师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O648.1

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