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首页> 外文期刊>RSC Advances >Anti-microbial efficiency of nano silver-silica modified geopolymer mortar for eco-friendly green construction technology
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Anti-microbial efficiency of nano silver-silica modified geopolymer mortar for eco-friendly green construction technology

机译：纳米银-二氧化硅改性地聚合物砂浆的环保绿色施工工艺抗菌效果

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摘要

A silver-silica nano composite based geopolymer mortar has been developed by simple adsorption of silver in a suitable amount of a colloidal silica suspension for anti-bacterial property development. The silver nanoparticles (3-7 nm) were attached on the surface of 20-50 nm sized silica nanoparticles. The silver-silica nano-composite was characterized by Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD) and energy dispersive X-ray spectral analysis. Mechanical strength, durability and mechanistic antibacterial activity of the silver-silica nano composite modified geopolymer mortar (GMAg-Si) were investigated and compared to nano silica modified geopolymer mortar (GM(Si)) and control cement mortar (CM). To accesses the anti-microbial efficacy of the samples, 99% mortality for Gram positive and Gram negative bacteria was calculated. Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) values were determined from batch cultures. The addition of 6% (w/w) of the silver-silica nano composite in the geopolymer mortar cured at ambient temperature shows substantial improvement in mechanical strength, durability and anti-bacterial property. Reactive Oxygen Species (ROS) generation and cell wall rupture as observed from fluorescence microscopy and Field Emission Scanning Electron Microscopy (FESEM) may be possible reasons behind the anti-bacterial efficacy of silver-silica nano composite modified geopolymer mortar.
机译：通过简单地将银吸附在适量的胶态二氧化硅悬浮液中来开发银-二氧化硅纳米复合材料基地质聚合物砂浆，以开发抗菌性能。将银纳米颗粒（3-7 nm）附着在20-50 nm尺寸的二氧化硅纳米颗粒的表面上。通过透射电子显微镜（TEM），X射线衍射（XRD）和能量色散X射线光谱分析对银-二氧化硅纳米复合材料进行了表征。研究了银-二氧化硅纳米复合改性地质聚合物砂浆（GMAg-Si）的机械强度，耐久性和机械抗菌活性，并将其与纳米二氧化硅改性的地质聚合物砂浆（GM（Si））和对照水泥砂浆（CM）进行了比较。为了获得样品的抗微生物功效，计算了革兰氏阳性和革兰氏阴性细菌的99％死亡率。从分批培养物中确定最小抑菌浓度（MIC）和最小杀菌浓度（MBC）值。在环境温度下固化的地聚合物砂浆中添加6％（w / w）的银-二氧化硅纳米复合材料可显着改善机械强度，耐久性和抗菌性能。从荧光显微镜和场发射扫描电子显微镜（FESEM）观察到，活性氧（ROS）的产生和细胞壁破裂可能是银-二氧化硅纳米复合改性土聚合物砂浆的抗菌功效背后的可能原因。

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