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为了模拟细胞色素P450酶的催化活性功能,提高金属卟啉的重复使用催化效率,通过π-π叠加相互作用将CoTNPP固载在氧化石墨烯(GO)上,形成一种仿生催化材料(CoTNPP/GO).用紫外可见光谱(UV-Vis)、傅里叶红外光谱(FT-IR)、比表面测试(BET)、X射线光电子能谱(XPS)、扫描电镜(SEM)和热重分析(TG)技术对该催化材料进行表征,并用于催化分子氧氧化乙苯.在最佳的反应温度和氧气压力(150℃和0.8 MPa)条件下,0.25g固载催化材料可重复使用8次,平均的乙苯转化率和醇酮产率分别为24.5%和16.3%. 相似文献
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The effects of crystallization temperature and blend ratio on the polymorphic crystal structures of poly(butylene adipate)(PBA) in poly(butylene succinate)(PBS)/poly(butylene adipate)(PBS/PBA) blends were studied by means of differential scanning calorimetry(DSC), wide-angle X-ray diffraction(XRD) and atomic force microscopy(AFM). It was revealed that the polymorphism of PBA can be regulated by the blend ratio even in a non-isothermal crystallization process. The results demonstrate that high temperature favors flat-on α crystals, while low temperature contributes to edge-on β crystals. It was also found that the effect of blend ratio on the crystallization mechanism of PBA is well coincident with that of the crystallization temperature. The increment of PBS content in the PBS/PBA blend gives rise to more β-form crystals of PBA. For those PBS/PBA blends with low PBA content, the interlamellar phase segregation of PBA makes its molecular chains so difficult to diffuse from one isolated microdomain to another that high crystallization temperature and sufficiently long crystallization time will be required if the PBA α-type crystals are targeted. 相似文献
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通过静态呼吸图法制备了具有高度有序微结构的聚苯乙烯-嵌段-聚4-乙烯吡啶共聚物(PS-b-P4VP)膜。以该嵌段共聚物膜为模板,可制得金属纳米粒子阵列。借助光化学还原途径制得了具有蜂窝状微结构的Ag纳米颗粒膜。以罗丹明6G(R6G)为探针分子,考察了蜂窝状Ag纳米颗粒膜用作表面增强拉曼散射(SERS)基底的性能。蜂窝状Ag纳米颗粒膜对R6G分子的表面拉曼散射增强因子高达1.31×10~9。另外,该SERS基底还显示了较低的检测限,检测限低至10~(-10)mol·L~(-1)。拉曼信号面扫显示了基底很好的信号均匀性。在此SERS基底上30μm×30μm范围内随机收集的120个拉曼信号强度的相对标准偏差仅为~12%。 相似文献
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