炭微球的结构演变:从实心到中空(英文)  

Structure evolution of carbon microspheres from solid to hollow

作　　者：杨永珍[1,2] 刘旭光[1,3] 罗秋苹[1,2] 金琳[1,2] 许并社[1,2] 

机构地区：[1]新材料界面科学与工程教育部重点实验室(太原理工大学),山西太原030024 [2]太原理工大学材料科学与工程学院,山西太原030024 [3]太原理工大学化学化工学院,山西太原030024

出　　处：《新型炭材料》2010年第6期431-437,共7页New Carbon Materials

基　　金：Changjiang Scholar and Innovative Research Team in University(IRT0972);National Natural Science Foundation of China(20971094);International S&T Cooperation Program(2007DFA50940);Natural Science Foundation of Shanxi Province(2009011012-4);International S&T Cooperation Program of Shanxi Province(2009081018,2010081017);Shanxi Research Fund for Returned Scholars(2008-31)~~

摘　　要：采用简单的空气氧化法由实心炭微球制备中空结构的炭微球。通过场发射扫描电子显微镜、高分辨透射电子显微镜、X-射线衍射仪、拉曼光谱和热重分析仪对产物的形貌和结构进行表征。结果表明:中空炭微球的石墨化程度较低。在炭微球的空气热氧化过程中,反应温度对炭微球从实心到中空的结构演变起着关键性的作用,温度越高,中空炭微球的内径越大、壁越薄。其形成机理可认为是炭微球的曲率和结晶度协同作用的结果。亦即,实心炭微球进行热氧化时,其内部的大曲率和低结晶度更易氧化,以致形成中空炭微球。Hollow carbon microspheres,several micrometers in diameter,were prepared from solid carbon microspheres by a simple oxidation-in-air process.The morphology and structure of these products were characterized by field-emission scanning electron microscopy,high-resolution transmission electron microscopy,X-ray diffraction,Raman spectroscopy,and thermogravimetry.Results indicate that heat treatment temperature in air plays a key role in the evolution of the cavity size and wall thickness of the hollow carbon microspheres with poor graphitization,and high heating temperature leads to a thin wall thickness and large inner diameter.A proposed formation mechanism reveals that the hollow carbon microspheres are formed as a result of the effect of curvature and crystallinity,i.e.the inner part of solid carbon microspheres has a large curvature and a low crystallinity,which is much more easily oxidized to form hollow carbon microspheres when subjected to air oxidation.

关 键 词：炭微球 氧化 中空炭微球 形成机理 

分 类 号：O613.71[理学—无机化学]