指针形与patchy-porous 型各向异性颗粒的制备、表征及调控

发布时间：2018-06-26 06:27

本文选题：各向异性颗粒 + 指针结构　；参考：《华东理工大学》2015年硕士论文

【摘要】：由于具有非对称的形状或不均匀的性质,各向异性颗粒具有很多普通均匀球形颗粒所不具备的优势以突破其固有的功能局限。多年来,以Janus、patchy及多组分型三种颗粒为基本类型,大量具有不同结构与性质的各向异性颗粒得到了广泛的研究。其中,微流控技术因其操作简易、可重复性高、成本低廉、产品可控等优点也在各向异性颗粒的制备研究中具有越来越重要的地位。但是,目前关于复合型各向异性颗粒的研究偏少,且颗粒整体与内部的结构特征难以实现完全独立地合成与调控。本文以微流控技术为基础,制备了指针形及patchy-porous型各向异性颗粒,结合SEM、micro-CT、显微成像等方法,对两者的微观结构进行了表征,通过改变实验条件进行了参数调控实验。此外,提出并验证了指针结构的形成机理,通过引入磁流体研究了指针结构的功能化,研究了patchy-porous型颗粒“skin”现象的产生原因及解决方法,结合拉曼光谱验证了其快速检测功能性。取得的主要研究结论如下：(1)确定了指针形颗粒的可重复性制备方法,实现了颗粒内外各向异性结构的独立合成与调控,全面观察且定量分析了指针结构的微观界面与形貌特征,实现了结构参数大范围、高精度的调控,并确定了较佳制备条件,初步探究了指针颗粒在微流变示踪、磁感线标记等领域的应用潜力。(2)发现了指针结构的形成机理,此种由渗透压引发的聚合层内外液体传质所造成的界面性质差异,为聚合材料结构与形貌的可控化合成提供了新的思路。(3)确定了patchy-porous型颗粒的制备方法,得到了不同实验条件对H202与NH4NCO3体系颗粒结构参数的影响规律,解决了H202体系颗粒的“skin”现象,获得了由Ag纳米粒子组成的表面patchy结构,初步探究了其在颗粒吸附物快速检测方面的应用潜力。
[Abstract]:Due to their asymmetric shape or uneven properties, anisotropic particles have many advantages that ordinary uniform spherical particles do not have in order to break through their inherent functional limitations. Over the years, a large number of anisotropic particles with different structures and properties have been widely studied with Januspatchy and multicomponent particles as the basic types. Microfluidic technology plays an increasingly important role in the preparation of anisotropic particles because of its simple operation, high reproducibility, low cost and controllable products. However, there are few studies on composite anisotropic particles, and it is difficult to synthesize and regulate the structural characteristics of the particles completely independently. Based on the microfluidic technique, the pointer and patchy-porous anisotropic particles were prepared. The microstructure of the two particles was characterized by means of SEMM-micro-CTand microscopic imaging, and the parameter adjustment experiments were carried out by changing the experimental conditions. In addition, the formation mechanism of pointer structure is proposed and verified. The functionalization of pointer structure is studied by introducing magnetic fluid, and the causes and solutions of the phenomenon of "skin" of patchy-porous type particles are studied. The rapid detection function was verified by Raman spectroscopy. The main conclusions are as follows: (1) the repeatable preparation method of pointer particle is determined, and the independent synthesis and regulation of anisotropic structure inside and outside the particle are realized. The microcosmic interface and morphology of pointer structure were observed and quantitatively analyzed, the structural parameters were adjusted in a wide range and high precision, the better preparation conditions were determined, and the microrheological tracer of pointer particles was preliminarily explored. (2) the formation mechanism of pointer structure, which is caused by liquid mass transfer inside and outside the polymer layer induced by osmotic pressure, is different. It provides a new idea for the controllable synthesis of the structure and morphology of polymeric materials. (3) the preparation method of patchy-porous particles is determined, and the influence of different experimental conditions on the particle structure parameters of H202 and NH _ 4NCO _ 3 system is obtained. The "skin" phenomenon of H202 particles was solved and the surface patchy structure composed of Ag nanoparticles was obtained. The potential of its application in the rapid detection of particle adsorbents was preliminarily explored.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.4

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