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The coordination polymers were analyzed by using FT-IR, UV-vis, and WAXD measurements. From FT-IR spectroscopy, we observed a CN stretching band shift from 2045 to 2084 cm-1 after the polymerization,6 indicating the formation of a cyanide bridge of Fe(II)-CN-Fe(III).7 In UV-vis spectra, a strong absorption at ca. 670 nm due to the FeII to FeIII CT8 appeared upon the addition of Fe3+.6 The intensity of this peak increased in proportion to the amount of Fe3+ added,6 suggesting the added Fe3+ ions were involved in the coordination polymerization. Different from other solid PB NPs,2,3 we found that MEPP-produced shells were amorphous probably due to their curved structures.6 Figure 1a shows a typical TEM image of the coordination polymer nanoshells with a diameter of ca. 65 nm. However, DLS measurements of the particles in a diluted solution revealed a diameter of 133 nm. These different results may be caused by interparticle coordination. As a matter of fact, the connection of the particles is clearly observed in the TEM image (see Figure 1a). This interparticle coordination could be alleviated by dropwise addition of the miniemulsion to Fe3+ aqueous solution instead of adding the Fe3+ to the miniemulsion.6A TEM image at higher magnification (see Figure 1b) shows that the particles exhibit a ring-like morphology, typical of hollow shell structures. The thickness of the ring is ca. 2 nm indicating the formation of a thin layer of the coordination polymer with anestimated aggregation number of 1106.6 EDX mapping reveals that carbon and iron elements (see Figure 1c and 1d) are uniformly distributed over the surface of the shells, confirming the formation of a shell of an organometallic network. A tapping mode AFM was performed, and short rods with hemisphere caps are observed (see Figure 1e). Undeformed shells were also observed from SEM experiments (see Figure 2). The observed rigidity of the shells could be attributed to directional coordination interactions. We next investigated the coordination polymerization with varied equivalents of Fe3+ with respect to Fe2+ in the surfactants.6 The resulting samples were dried from the solutions and characterized using SEM. The SEM images indicated that a minimum of 1 equiv of Fe3+ is required to preserve the shape of the miniemulsion droplets6 and hence to generate shell structures. Synthesis of the shells with varied size using MEPP is possible. In two experiments, we prepared a miniemulsion using the same amount of EPE-Fe (0.5% by weight), but with a toluene content of 5% and 20% by weight, respectively. As characterized by TEM, the particles prepared from the solution containing 20% toluene are ca. 198 nm, which is about twice as large as those in the system with 5% toluene.6 |
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zap65535(金币-5):本版严格禁止。机器翻译。 1-25 22:37
zap65535(金币-5):本版严格禁止。机器翻译。 1-25 22:37
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用谷歌翻页的结果,如下： http://translate.google.cn/translate_t# 将英语译成中文显示拼音 协调聚合物进行了分析用红外光谱， 紫外可见，和WAXD测量。从红外光谱， 我们观察到的CN延伸带，从2045年转移到2084厘米- 1 聚合后，6显示了一个氰化物的形成 桥中Fe（Ⅱ）-架CN -铁（Ⅲ）在0.7紫外可见光谱，强大的 CA公司吸收。 670纳米，由于FeII的FeIII八号货柜码头后出现 除了在中Fe3 + 0.6本峰强度增加 按比例掺杂Fe3 +的含量增加，6暗示说Fe3 +的 离子参与了配位聚合。不同 从其他固体铅纳米粒，2,3，我们发现，终板电位生产的炮弹 非晶态可能是由于其弯曲structures.6 图1a显示了典型的TEM照片协调 一个直径聚合物纳米壳的CA。 65纳米。然而，当值律师服务 粒子测量稀释液中发现一 直径133纳米。这些不同的结果可能是由 粒间的协调。由于事实上，连接的 颗粒显然是透射电子显微镜观察到的图像（参见图1a）。 这粒间协调，可以缓解滴加 除了在细乳液的Fe3 +水溶液代替 添加Fe3 +离子在高放大倍率的miniemulsion.6A TEM图（见图1b）显示 这些颗粒展示出环状形态，典型的空心 壳结构。环的厚度是CA。 2纳米说明 在一个与anestimated映射的1106.6能谱聚集数位聚合物薄膜层的形成表明， 元素碳和铁（见图1C和1D）是均匀 分布在地表的炮弹，确认形成 一个网络的金属外壳。阿轻敲模式原子力显微镜 是执行，并与半球帽短杆得到遵守 （见图1e段）。未变形炮弹还指出，从扫描电镜 实验（见图2）。该炮弹可观察到刚性 归因于方向性的协调互动。 我们今后研究与协调，聚合不同 等值中Fe3 +与Fe2 +的方面在surfactants.6的 造成样品干燥的解决方案和特点 利用扫描电镜。扫描电镜图像显示，至少1当量 中Fe3 +必须保持形状的细乳液 droplets6，从而产生壳结构。 与使用不同大小的弹终板电位合成是可能的。 在两个实验，我们准备了细乳液使用相同的 量珍珠棉铁（0.5％重量比），但有甲苯含量 5％和20％的重量分别。由于用TEM， 从含20％甲苯溶液编写的粒子 是的CA。 198纳米，大约是两倍，系统内的大 5％toluene.6 大致能翻译，语序和语法自己调整，大体上能翻译出来 |
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4楼2010-01-25 13:05:08
chengcj.2008
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