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Self-assembly fabrication, microstructures and antibacterial performance of layer-structured montmorillonite nanocomposites with cationic silica nanoparticles

机译：用阳离子二氧化硅纳米粒子的层结构蒙脱石纳米复合材料的自组装制造，微观结构和抗菌性能

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摘要

This paper reports the synthesis and antibacterial performance of a novel type of layer-structured montmorillonite (MMT) nanocomposite with cationic silica nanoparticles through an intercalating self-assembly method. The quaternary amine-functionalized SiO2 nanoparticles were first prepared by grafting dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (PQAC) onto the surfaces of silica nanoparticles, and their chemical composition and structure were characterized by Fourier-transform infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy. Then, the reactant PQAC-SiO2 nanoparticles were intercalated into the interlayers of MMT through electrostatic self-assembly to achieve the layer-structured MMT/PQAC-SiO2 nanocomposites. The ordered and layered structural characteristics of the resulting nanocomposites were characterized using X-ray diffraction patterns and N-2 adsorption-desorption measurements and then confirmed by scanning electron microscopy and transmission electron microscopy. The optimum weight ratio of MMT/PQAC-SiO2 nanoparticles was also achieved for the self-assembly fabrication of the nanocomposites on the basis of results mentioned above. The MMT/PQAC-SiO2 nanoparticles gained an excellent thermal stability due to the intercalation of PQAC-SiO2 nanocomposites into MMT and their onset degradation temperature was improved by 40 degrees C compared to that of PQAC-SiO2 nanoparticles. Most of all, the nanocomposites presented a significant antibacterial effect against Escherichia coli and Staphylococcus aureus as the model microorganisms of Gram-negative and Gram-positive bacteria, respectively. This type of layered structural nanocomposite is expected to be applied for food packaging and containment of food materials, medical bandages for wound care, removal of environment pollutants like pesticides and phenol, etc.
机译：本文通过互连的自组装方法报道了一种具有阳离子结构型蒙脱石（MMT）纳米颗粒的新型层结构蒙脱土（MMT）纳米粒子的合成和抗菌性能。首先通过将二甲基癸基[3-（三甲氧基甲硅烷基）丙基氯化铵（PQAC）涂覆到二氧化硅纳米颗粒的表面上制备季胺官能化的SiO 2纳米颗粒，其化学组成和结构的特征在于傅里叶变换红外光谱，热重分析和X射线光电子能谱。然后，通过静电自组装将反应物PQAC-SiO 2纳米颗粒嵌入到MMT的中间层中以实现层结构的MMT / PQAC-SiO2纳米复合材料。使用X射线衍射图和N-2吸附 - 解吸测量的所得纳米复合材料的有序和分层结构特性，然后通过扫描电子显微镜和透射电子显微镜确认。基于上述结果，还实现了MMT / PQAC-SiO2纳米颗粒的最佳重量比对于纳米复合材料的自组装制造。由于PQAC-SiO2纳米颗粒的纳米粒子与PQAC-SiO2纳米颗粒相比，MMT / PQAC-SiO2纳米颗粒在MMT中的插入中获得了优异的热稳定性。大多数情况下，纳米复合材料分别向大肠杆菌和金黄色葡萄球菌的显着抗菌作用分别作为革兰氏阴性和革兰氏阳性细菌的模型微生物。这种类型的层状结构纳米复合材料预计将适用于食品包装和遏制食品材料，用于伤口护理的医用绷带，除去杀虫剂和苯酚等环境污染物等。

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  • 来源
    《RSC Advances》 |2017年第50期|共10页
  • 作者

    Wang Xiangshuo; Shi Ling; Zhang Junying; Cheng Jue; Wang Xiaodong;

  • 作者单位

    Beijing Univ Chem Technol Key Lab Beijing City Preparat &

    Proc Novel Polyme Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Key Lab Beijing City Preparat &

    Proc Novel Polyme Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Key Lab Beijing City Preparat &

    Proc Novel Polyme Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Key Lab Beijing City Preparat &

    Proc Novel Polyme Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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