CAJ | 학술논문

以多孔块状硅体为模板,通过一步浸渍、炭化、酸处理工艺,制备出结构可控、孔隙联通且具有多重孔隙的铸型炭体.分别采用氮吸附技术、高分辨透射电镜和扫描电镜对模板硅、硅碳复合物及相应炭体进行了结构表征.从微米尺度分析,该炭体是由高度联接的枝状结构单元为骨架构筑而成.与模板硅相比较,此炭体是硅体的正复本.从纳米尺度分析,这种炭体枝状骨架是由分布均匀且相互连接的中孔构成,此中孔及其孔壁对应于模板硅的孔壁及中孔,是多孔硅的负复本.此外构成中孔的炭骨架本体又含有大量炭化过程产生的微孔.因此该法合成的铸型炭具有孔隙高度发达和结构层层嵌套的特点.
이다공괴상규체위모판,통과일보침지、탄화、산처리공예,제비출결구가공、공극련통차구유다중공극적주형탄체.분별채용담흡부기술、고분변투사전경화소묘전경대모판규、규탄복합물급상응탄체진행료결구표정.종미미척도분석,해탄체시유고도련접적지상결구단원위골가구축이성.여모판규상비교,차탄체시규체적정복본.종납미척도분석,저충탄체지상골가시유분포균균차상호련접적중공구성,차중공급기공벽대응우모판규적공벽급중공,시다공규적부복본.차외구성중공적탄골가본체우함유대량탄화과정산생적미공.인차해법합성적주형탄구유공극고도발체화결구층층감투적특점.
Carbon monoliths with a multi-modal hierarchical porosity have been prepared by a nanocasting method with silica monoliths as the scaffold, in which volume and surface templating has been successfully combined in a one-step impregnation approach, and the smaller pores in the silica template are impregnated in a straightforward way. The monoliths obtained at different stages of the process were characterized by N2-adsorption, scanning electron microscopy and transmission electron microscopy. It is shown that the carbon monoliths represent a positive replica of the starting silica monoliths on the micrometer scale. The surface templated mesopores can be regarded as a positive replica, while the volume templated mesopores are a negative replica of the silica scaffold.