陶瓷膜射流法制备单分散异辛烷/甲酰胺乳液的研究

乳液模板法是制备高度有序多孔材料的重要方法之一。采用二次陶瓷膜乳化在射流条件下制备单分散乳液的方法成功制备出一种非水乳液模板。一次射流过程采用平均孔径为0.2μm的ZrO2陶瓷膜作为乳化介质,二次射流乳化过程采用平均孔径为1.6μm的α-Al2O3陶瓷膜作为乳化介质。异辛烷/甲酰胺体系为研究对象,三嵌段高分子聚（乙二醇）-聚（丙二醇）-聚（乙二醇）作为乳化剂,制备出平均粒径在1-2μm的单分散乳液模板,并考察了操作压力、异辛烷浓度对液滴粒径及粘度的影响。

Preparation of Macroporous TiO2 Ceramic Based on Membrane Jet-flow Emulsification

A novel method to prepare macroporous TiO2 ceramic,based on membrane emulsification was reported. To solve the paradox between the instability of nonaqueous emulsion and long emulsification time required by the membrane emulsification,a two-stage ceramic membrane jet-flow emulsification was proposed.Discussion was conducted on the evolution of droplet size with time,which followed the Ostwald ripening theory.And a monodis- persed nonaqueous emulsion with an average droplet size of 1.6μm could be prepared.Using the emulsion as a template,TiO2 ceramics with an average pore size of 1.1μm were obtained.The material could be prospectively used for preparation of catalysts,adsorbents,and membranes.

石墨烯基氧还原催化剂在金属空气电池中的应用

随着金属空气电池技术的不断发展,氧还原催化剂成为限制其动力化的最主要瓶颈之一。近几年来,石墨烯基氧还原催化剂(GORRC)由于优异的氧还原催化活性而备受关注。本文结合石墨烯基氧还原催化剂的研究现状,将其分为三类:石墨烯作氧还原催化剂载体,氮掺杂石墨烯作为氧还原催化剂,以及氮掺杂石墨烯与其他催化剂形成的复合催化体系,并对这三种石墨烯基氧还原催化剂进行了详细的综述。石墨烯作为一种优良的催化剂载体,能够显著降低活性物质负载量,提高氧还原催化剂的催化活性和长期稳定性。氮掺杂石墨烯显示了优良的氧还原催化性能。氮掺杂石墨烯与其他催化剂复合后,由于两者之间的相互作用,可得到性能更为优异的氧还原催化剂。最后,本文还对石墨烯基氧还原催化剂及其在金属空气电池中的研究前景和发展方向进行了展望,指出了将来的研究重点。

追逐青春的梦想

青春的阳光清新而芬芳风吹柳条。