桉木浆纳/微米和脱脂棉纳米纤维素的形貌分析

Morphology Analysis of Nano-Microcrystalline Cellulose from Eucalyptus Pulp and Cotton Nanocrystalline Cellulose

用环境扫描电子显微镜和透射电子显微镜表征了桉木浆纳/微米和脱脂棉纳米纤维素的形貌。环境扫描电子显微镜观察桉木浆纳/微米和脱脂棉纳米纤维素表面形貌不同,桉木浆纳/微米纤维素主要呈棒状,长度小于20μm,直径可达0.377μm;脱脂棉纳米纤维素主要呈球状,长度小于0.5μm。利用环境扫描电子显微镜,脱脂棉纳米纤维素超声波破碎后直接观察和再经冷冻干燥后观察表面形貌有一定的差异。透射电子显微镜观察桉木浆纳/微米纤维素和脱脂棉纳米纤维素的长度可达到纳米级。

The morphology of microcrystalline cellulose（MCC） or nanocrystalline cellulose（NCC） from eucalyptus pulp and dewaxed cotton NCC were characterized by means of an environmental scanning electronic microscope（ESEM） and transmission electronic microscope（TEM）,respectively.The surface morphology of nano-microcrystalline cellulose（N-MCC） from eucalyptus pulp is different from that of NCC from dewaxed cotton.The surface morphology of eucalyptus pulp N-MCC is rod-like with less than 20 μm of length,but the diameter of the N-MCC could reach up to 377 nm.The surface morphology of dewaxed cotton NCC is spherical-like with less than 500 nm in length.For the surface morphology of the dewaxed cotton NCC,there is a little difference after ultrasonic crushing between direct and freeze-dried observation with ESEM.The lengths of celluloses from eucalyptus pulp and dewaxed cotton could be reached up to nanometer grade.