Lehrstuhl Anorganische Chemie II, Universität Bayreuth, Bayreuth, Germany.
Small. 2013 Apr 8;9(7):984-9. doi: 10.1002/smll.201370042.
SiCN fibers with a mean diameter of 50 nm and an aspect ratio of up to 100 are produced in a two-step process by R. Kempe and co-workers. The key step to fabricate the longitudinal and cross-sectional views of the mesofibers shown here is a concerted block-copolymer synthesis, microphase separation, and cross linking at 140 °C followed by pyrolysis at 1100 °C. Inexpensive components like a commercially available silazane and polyethylene are linked. The fibers may find application in electronic devices, as components of ceramic matrix composites, as fiber beds in high-temperature nano-filtering like diesel fine dust removal, or as thermally robust and chemically inert catalyst supports. Furthermore, the SiCN nanofibers introduced on page 984 are a promising alternative to ultrathin carbon fibers, due to their oxidation resistance.
R. Kempe 等人采用两步法制备出平均直径为 50nm、纵横比高达 100 的 SiCN 纤维。在此展示的中孔纤维的纵截面和横截面的关键步骤是通过协调的嵌段共聚物合成、微相分离和在 140°C 交联，然后在 1100°C 下进行热解。廉价的成分，如市售的硅氮烷和聚乙烯被连接在一起。这些纤维可能在电子设备中找到应用，作为陶瓷基质复合材料的组成部分，作为高温纳米过滤（如柴油细粉尘去除）中的纤维床，或作为热稳定和化学惰性的催化剂载体。此外，由于其抗氧化性，第 984 页介绍的 SiCN 纳米纤维是超纤细碳纤维的一种很有前途的替代品。
