Synthesis and antimicrobial activity of ZnTi-layered double hydroxide nanosheets.
Synthesis and antimicrobial activity of ZnTi-layered double hydroxide nanosheets.
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DOI：
10.1039/c3tb21059f
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Yufei Zhao;Chenglei Wang;W. Gao;Bei Li;Qiang Wang;Lirong Zheng;Min Wei;D. Evans;X. Duan;D. O′Hare
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文献类型：
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作者：
Yufei Zhao;Chenglei Wang;W. Gao;Bei Li;Qiang Wang;Lirong Zheng;Min Wei;D. Evans;X. Duan;D. O′Hare
采用反相微乳液法制备了横向尺寸为40 ~ 80 nm的窄粒径分散双氢氧化物（LDH）纳米片。电子自旋共振（ESR）和x射线光电子能谱（XPS）测量显示，Ti3+位点在这些纳米级LDH血小板中产生。结果表明，纳米片中Ti3+离子的浓度与纳米片的大小有关，40 nm纳米片的带隙约为2.3 eV。光化学活性和纳米颗粒尺寸的结合导致材料在可见光下表现出高的抗病原体活性。在可见光下，研究了LDHs的杀虫效果。ZnTi-LDHs在培养中对酿酒葡萄球菌、金黄色葡萄球菌和大肠杆菌表现出大小依赖性的细胞毒性。40nm的ZnTi-LDH纳米血小板（ZnTi-LDH- rm1）是最有效的，导致95%的细胞死亡。与传统制备的ZnTi-LDH或纳米颗粒金属氧化物WO3和TiO2 （P25）相比，这些纳米血小板更具活性。纳米ZnTi-LDHs在培养中对酿酒葡萄球菌、金黄色葡萄球菌和大肠杆菌的生长有明显的抑制作用。
Narrow size dispersion ZnTi-layered double hydroxide (LDH) nanosheets with lateral dimensions in the range 40-80 nm have been synthesised using a reverse microemulsion method. Electron Spin Resonance (ESR) and X-ray photoelectron spectroscopy (XPS) measurements reveal that Ti3+ sites are generated within these nanosized LDH platelets. The data show that the concentration of Ti3+ cations in the nanoplatelets is size-dependent, the 40 nm nanoplatelets have a bandgap of ca. 2.3 eV. The combination of photochemcially activity and nanoparticle size results in materials that exhibit high antipathogen activity under visible light. The biocidal efficacies of the LDHs have been investigated under visible light. The ZnTi-LDHs display size-dependent cytotoxicity against S. cerevisiae, S. aureus and E. coli in culture. The 40 nm ZnTi-LDH nanoplatelets (ZnTi-LDH-RM1) are the most potent resulting in 95% cell death. These nanoplatelets are more active compared to a conventionally prepared ZnTi-LDH or the nanoparticulate metal oxides WO3 and TiO2 (P25). The nanosized ZnTi-LDHs severely inhibit the growth of S. cerevisiae, S. aureus and E. coli in culture.