有无液晶性的氧化石墨烯之间的差异  

Differences between Graphene Oxides with and without Liquid Crystalline

作　　者：汤慕尧 贺春华[1] 张海燕[1] 林锦[1] 成正东[1] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《材料科学与工程学报》2015年第2期203-206,267,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51276044);广东省自然科学基金资助项目(S2013010015994);国家高技术研究发展计划(863计划)资助项目(2012AA040210);广东省高等学校科技创新重点资助项目(粤财教〔2011〕473号)

摘　　要：本文采用两种化学氧化法制备氧化石墨烯(graphene oxide GO),在偏光显微镜下GO A有液晶性为各向异性相,GO B无液晶性呈现各向同性相。正交偏光片下GO A有光学变化而GO B没有光学变化。借助X射线衍射和拉曼光谱比较两种GO的结构,利用傅里叶红外光谱比较GO的表面官能团,利用旋转流变仪比较GO的流变性能,在扫描电镜下比较GO的形貌。研究结果表明,有液晶性的GO A质量更优异。Two chemical oxidation methods were used to synthesize graphene oxide （GO）. An anisotropic phase with liquid crystalline characteristics in GO A and an isotropic phase without liquid crystals in GO B were found under polarizing microscope. GO A showed an obvious optical change between crossed polarizers, but GO B did not. Structures of GO A and GO B were examined using X-ray diffraction （XRD） and Raman spectra. Fourier Transform Infrared （FTIR） was used to compare the oxygen containing function groups of GO A and GO B. Rheological properties were tested by rotary rheometer And morphologies of these samples were also observed by scanning electron microscope （SEM）. Experimental results show the GO A has much larger interlayer spacing, more incomplete structure, more rich hydrophilic groups, smaller thickness and greater viscosity. Liquid crystalline of GO provides a simple way to judge the quality of GO which is prepared hy the chemical oxidation method.

关 键 词：氧化石墨烯 液晶性 各向异性相 

分 类 号：O613.71[理学—无机化学]