摘要现如今细菌感染的形势愈发严峻,随着人们健康意识的逐渐提高,对抗菌制品的需求也与日俱增。单一的抗菌机理存在各自的缺陷,需要将不同的抗菌机理复合应用,构建具有多重功效的抗菌体系。Fe3O4磁性纳米粒子既有独特的磁学性质,又有纳米粒子的特性,是构建多重抗菌体系一种优良的载体。73518
本论文中,以共沉淀法制备出Fe3O4磁性纳米粒子,对其表面进行修饰改性,然后用静电层层自组装的方法在其表面逐层组装季铵化壳聚糖和海藻酸钠多层膜,并利用抗坏血酸的还原作用生成纳米银,制备了兼具季铵盐类抗菌机理和银系抗菌机理的双重抗菌纳米材料。利用红外光谱(FTIR)、Zeta电位、动态光散射(DLS)、X射线衍射(XRD)、透射电镜(TEM)等手段对实验过程和实验结果进行了系统的表征分析,通过抑菌圈和抗菌动力学测试评价了材料的抗菌性能。
毕业论文关键词 抗菌 磁性纳米粒子 层层自组装
毕业设计说明书外文摘要
Title Research on preparing multiple antibacterial magnetic nanoparticles by layer-by-layer self-assembly technology
Abstract Nowadays the situation of bacterial infection is getting worse and worse。 With the improvement of people’s health consciousness, the demand for potent antibacterial products is growing。 The simplex antibacterial mechanism has their own defects, so it is necessary to combine different antibacterial mechanism into one single system to build multiple antibacterial meterials。 Fe3O4 magnetic nanoparticles have both magnetic properties and nano-characteristics which is a good carrier to build a multiple antibacterial system。
In this paper, Fe3O4 magnetic nanoparticles were prepared by an improved chemical coprecipitation method。 After surface modification, quaternary ammonium/nano silver modified magnetic nanoparticles were prepared by layer-by-Iayer self-assembly technology。 The material was characterized by infrared spectroscopy (FTIR), Zeta potential, dynamic light scattering (DLS), X-ray diffraction (XRD) and transmission electron microscope (TEM)。 The manufacture of inhibition zone and time-killing assay was used to evaluate the properties of antibacterial materials。
Keywords antibacterial magnetic nanoparticles layer-by-Iayer self-assembly technology
目 次
1 绪论1
1。1 引言1
1。2 抗菌剂概述1
1。2。1 抗菌剂的分类1
1。2。2 天然抗菌剂2
1。2。3 季铵盐类抗菌剂2
1。2。4 银系抗菌剂3
1。3 磁性纳米材料4
1。3。1 磁性纳米材料的特点4
1。3。2 磁性纳米粒子表面修饰方法5
1。3。3 经表面改性磁性纳米粒子的特性6
1。4 本课题的选题意义及研究内容6
1。4。1 选题意义6
1。4。2 研究内容7
2 静电层层自组装构建多重抗菌磁性纳米粒子的研究8
2。1 静电层层自组装技术8
2。1。1 概述8
2。1。2 自组装方法的优点8
2。1。3 对自组装技术的展望9
2。2 季铵盐/纳米银型磁性纳米多重抗菌复合材料的制备9
2。2。1 前言9