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扫描电子显微镜

Scanning Electron Microscope

 
 
 
 
 

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扫描电镜应用之:化学工程催化吸附材料  

2011-12-03 00:33:20|  分类: 默认分类 |  标签: |举报 |字号 订阅

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By means of micro- and nano-fabrication methods based on electrohydrodynamic forces, we can  design nanocapsules, nanotubes, and nanofibers of inorganic, hybrid (organic/inorganic), organic, and biological materials for a variety of applications. Specifically, these submicron structures can be utilized for preparing nanovesicles for controlled release applications, reinforced composites, sorbents and catalysts, and tissue scaffolds.

扫描电镜应用之:化学工程催化吸附材料 - 驰奔 - --COXEM (酷塞目)有限公司--

Figure 1.
The two immiscible liquids (red and blue in this figure) are injected through two concentric electrified needles which are placed a few centimeters away from a grounded electrode (the collector). A compound Taylor cone is developed from whose tip a coaxial nano jet is emitted. Upon solidification of the outer liquid a sheathed fiber, or a liquid filled hollow fiber is formed
\扫描电镜应用之:化学工程催化吸附材料 - 驰奔 - --COXEM (酷塞目)有限公司--
Figure 2. Hollow nanotubes, as-collected, from a compound electrospray of an aged sol formulation (outer fluid) and glycerin (inner liquid).(A) Cylindrical nanotubes, without traces of varicose deformations. (B) View of the sample after being cut perpendicularly to the axis of the fibers, to expose their hollow structure. Note the good degree of monodispersity in tube diameter. (C) High resolution SEM of one of the nanotubes. (D) Cotton puff-like hollow nanofiber deposits collected in few minutes of operation; the ruler is in cm.
 
扫描电镜应用之:化学工程催化吸附材料 - 驰奔 - --COXEM (酷塞目)有限公司--
3. A fibrous chitosan film with a very high degree of microfiber orientation. Shown on the right is the nanofiber interconnects that gives improved mechanical strength to the overall structure.
 
扫描电镜应用之:化学工程催化吸附材料 - 驰奔 - --COXEM (酷塞目)有限公司--
4. A macroporous carbon sorbent made by templating a resin with silica submicron fibers, followed by pyrolysis and removal of the fibers by HF washing. Macroporous sorbents with quasi-cylindrical pores are more difficult to synthesize than their less efficient counterparts based on spheroidal cavities. The latter present transport "bottlenecks" due to their narrow pore interconnects. 
 
扫描电镜应用之:化学工程催化吸附材料 - 驰奔 - --COXEM (酷塞目)有限公司--

 Figure 5. 3-7 ?m silica/siloxane hybrid vesicles with 50-100 nm shells. The vesicles were solvent-extracted and mechanically broken to expose their core-shell structure.

From:Research Centers of Chemical & Biomolecular Engineering University of Nebraska-Lincoln

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