干燥时间对制备大面积有序纳米孔炭膜的影响

Effect of Drying Time on the Large-Scaled Preparation of Ordered Nanoporous Carbon Membranes

以酚醛树脂为前驱体,表面活性剂F127为模板剂,NaOH为催化剂,通过有机自组装、成膜和炭化等过程,制备了有序纳米孔炭膜(ONCM)。采用热失重分析、扫描电镜、透射电镜和氮吸附等技术,对前驱体热稳定性、ONCM表观形貌、微孔孔结构有序性和孔结构参数进行了测定。考察了干燥时间和F127用量等对ONCM成膜性与微结构的影响。结果显示,在最佳成膜条件为干燥4h、苯酚/活性剂F127物质的量比为1∶0.008时,所得ONCM具有最小平均孔径、孔体积和比表面积。

Ordered nanpoporous carbon membranes(ONCM)were prepared by applying phenolic resin as precursor and surfactant F127 as template,in the presence of NaOH as catalyst,through the processes of organic assembly,membrane-forming and carbonization.Thermogravimetric analysis,scanning electron microscope,transmittance electron microscope and nitrogen adsorption techniques were utilized to characterize the thermal stability of precursor,the morphology,the regularity of microporous structure and porous structure parameters of ONCM.The effects of membrane-forming factors of F127 amount,drying time,etc.,on the membrane-forming efficiency and microstructure of ONCM was investigated.The results showed that ONCM exhibited smallest mean pore diameter,porous volume and specific area under the optimum membrane-forming condition of drying duration of 4 hand phenol/surfactant F127 molar ratio of 1∶0.008.