材料期刊网

以α-磷酸锆(分子式: Zr(HPO₄)₂·H₂O, 以下简称α-ZrP)为载体, 三种季铵型离子液体: 溴化十六烷基三甲基咪唑(C₁₆MIMBr)、氯化十六烷基二甲基苄基铵(C₁₆HDBACCl)和氯化十六烷基三甲基铵(C₁₆CTACCl)被引入α-ZrP层间, 制备得到三种离子液体/α-磷酸锆(IL-ZrP)复合抗菌材料. 通过X射线衍射法(XRD)、红外光谱分析(FTIR)、热重-红外联用分析(TG-FTIR)对材料的结构、组成和热稳定性进行表征. XRD结果表明: 相对于α-ZrP, 三种复合抗菌材料的层间距明显增大, 这证明离子液体已经成功地嵌入到α-ZrP的层间. TG-FTIR实验显示三种离子液体在复合抗菌材料中分别占53.11wt%、50.65wt%和51.25wt%. 三种纯离子液体的热分解起始温度分别为174℃、198℃和219℃, 而离子液体/α-ZrP(IL-ZrP)复合抗菌材料中所含的离子液体的热分解起始温度为219℃、225℃和263℃, 这表明α-ZrP能有效提高离子液体的耐热性. 抗菌性能检测结果表明: 在三种复合材料中, C₁₆MIMBr-ZrP具有较好的抗菌效果(在24 h内, 其对大肠杆菌、金色葡萄球菌的最小抑菌浓度均小于19 mg/L).

Three different ionic liquids/α-zirconium phosphonates (IL-ZrP) composites antibacterial materials were prepared by introducing quarternary ammonium type ionic liquids (1-hexadecyl-3-methylimidazolium bromide, C₁₆MIMBr; hexadecyl dimethyl benzyl ammonium chloride, C₁₆HDBACCl; hexadecyl trimethyl ammonium chloride, C₁₆CTACCl) into the interlayer of α-zirconium phosphonates (α-ZrP). The structure, components and thermal stability of composites was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR), Thermogravimetric-Fourier transform infrared spectroscope analysis (TG-FTIR). XRD patterns show that the interlayer spacing of IL-ZrP are larger than the original α-ZrP. It represents that the ionic liquids are intercalated into the layer of α-ZrP. TG-FTIR shows that the mass fraction of C₁₆MIMBr, C₁₆HDBACCl and C₁₆CTACCl in three IL-ZrP are 53.11wt%, 50.65wt% and 51.25wt%, respectively. The onset temperatures of the decomposition for C₁₆MIMBr, C₁₆HDBACCl and C₁₆CTACCl are 174℃, 198℃ and 219℃, while the onset temperatures of the decomposition for C16MIMBr-ZrP, C₁₆HDBACCl-ZrP and C₁₆CTACCl-ZrP are 219℃, 225℃ and 263℃. The existing of α-ZrP improves the thermal stability of ionic liquids. Among the three IL-ZrP, the C₁₆MIMBr-ZrP has excellent antibacterial activity, (i.e. within 24 h, the minimal inhibitory concentration of C₁₆MIMBr pillared α-zirconium phosphonates against S. aureus and E. coli is less than 19 mg/L).