The Synthesis And Characterization Of Mesoporous Organic-inorganic Composite Nanoparticle

In recent years, the synthesis and characterization of mesoporous organic-inorgainc nanocomposite materials has been regarded as one of the hot spot in materials science and attracted lots of attention both in academic and industry. As a very important organic-inorganic composite materials, the mesoporous organic-silica nanocomposite system intrigues much interests from scientists. The mesoporous silica usually possesses some unique characters, such as high specific surface areas, uniform pore diameters, well stability and so on. Therefore, composite the mesoporous silica with another organics or organic polymer to form a mesoporous organic-silica nanocpomposite materials would present a double merits of the composites and could be utilized in various areas. Consequently, the synthesis and structure characterization of mesoporous organic-silica nanocomposites is a significant and meaningful work.Mesoporous organic-silica nanocomposite materials can be used in many fields and are closely related to people’ s production and life, such as heat storage material field, the field of new energy electrode material, protein separation material field, pollutants adsorption material field etc.. The structure of the materials can affect their performance, and then determine the scope of their application. Therefore, through careful design and synthesis of the mesoporous organic-silica nanocomposites with different structure will make it also has many functions and meet the requirements of different applications.In this paper, three mesoporous organic-silica nanocomposite materials were synthesized by a modified sol-gel approach, including mesoporous searic acid-silica nanocomposites, mesoporous polypropylene-silica nanoparticle composites and mesoporous polycarbonate-silica nanosphere composites. The structure characterrizaiton of these three nanocomposites was performed by utilizing the Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Infrared spectrometry (IR) analyses, Thermogravimetric analyses (TGA), Differential scanning calorimetry (DSC), Wide angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS), Nanoparticle tracking analysis (NTA).All the research contents and results are as follows:(1) Preparation and thermal characterization of mesoporous stearic acid-silica phase change materialPhase change energy storage materials development has been widespread concerned in the field of environmental protection. Stearic acid is a widely used organic solid-liquid phase change material, it has good phase transition properties. However, in the use of stearic acid as phase change material, in the event of solid-liquid phase change often occur when stearic acid leaks, which would affect the scope of its application. The mechanical strength of stearic acid is low because of the can not be used as an effective material for energy storage and alone. In order to solve these two problems, the design and synthesis of stearic acid composite, mesoporous silica phase change material in this paper. Silica also has better mechanical strength and excellent thermal conductivity, which makes the composite phase change can also have good performance of mechanical and phase transition. In this paper, the mesoporous stearic acid-silica composite phase change material was synthesized by the solvent-free sol-gel approach. The thermal property and crystallization behavior and phase change behavior were investigated particularly. This three component phase change materials with good phase change and mechanical properties, which is expected to be an excellent phase change energy storage material and has been widely applied.(2) Preparation and characterization of polypropylene-silica nanoparticle with interpenetrating network via hot emulsion sol-gel approachThrough careful design and synthesis of the special structure of organic silica composite materials will make it with a variety of functions and used for different applications. In this paper, the polypropylene melt emulsion as template, tetraethyl orthosilicate as the inorganic precursors by sol gel method, were synthesized for the first time with interpenetrating structure of polypropylene-silica composite nanoparticles, and using scanning electron microscopy, transmission electron microscopy, infrared spectroscopy, thermogravimetric analyzer, nitrogen adsorption instrument of a detailed analysis of the structure of the composite particles. The composite particles with organic-inorganic interpenetrating structure, so it can improve the toughness and mechanical stability of silica, which makes it can be used as a new type of electrode material and the development and application in lithium batteries are widely used. At the same time, because the organic-inorganic interpenetrating structure, the composite particles uniformly distributed in the hydrophilic hydrophobic region exists, the hydrophilic hydrophobic point can be with the hydrophilic hydrophobic protein of points to cooperate with each other to produce strong adsorption function, so it can be used as protein separation material is an effective and widely used.(3) Synthesis and characterization of full interpenetrating structure mesoporous polycarbonate-silica spheres and p-phenylenediamine adsorptionAdsorption material with multi functions has received widespread attention in the field of environmental protection. In the adsorption materials currently in use, most only have single function such as adsorption, only the adsorption of organic-pollutants and harmful gas. Therefore, through the design and synthesis of the important scientific and practical significance of adsorption material with multi functions. Multifunctional adsorption material of this model not only can adsorb organic pollutants effectively but also can remove radioactive gases harmful to human body. In this content, a novel mesoporous PC-silica spheres with full interpenetrating structure were synthesized through a modified sol-gel approach. The results showed that the composite microspheres, radiation type channel the submicron spherical morphology and rules are uniform, with larger specific surface area and uniform pore size distribution, and has excellent adsorption properties of benzene two amine, which may be used as an efficient multifunctional adsorption material and has been widely applied.