表面活性剂辅助水热法制备碳酸铝铵纤维及其生长机理初探  

Surfactant Assisted Hydrothermal Synthesis of AACH Microfiber and Its Growth Mechanisim

作　　者：朱振峰[1] 孙洪军[1] 刘辉[1] 杨冬[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《人工晶体学报》2010年第1期110-114,119,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50772064);陕西科技大学研究生创新基金资助课题

摘　　要：以硝酸铝为铝源,聚乙二醇(PEG)为表面活性剂,采用水热法制备了碳酸铝铵(AACH)纤维。利用XRD、SEM、TEM、TGA以及FT-IR对产物的相态、结构、形貌进行了分析,对其生长机理进行了初步研究。实验结果表明:具有单晶属性的AACH纤维直径约为500nm,长径比为15～20,热分解过程中经历Al2O3(无定形)→γ-Al2O3→α-Al2O3+θ-Al2O3→α-Al2O3的相变过程,并释放出约56.32wt%的气体,是一种很好的阻燃剂材料。AACH纤维的生长首先是AACH纳米晶通过氢键作用沿着聚乙二醇主链定向生长形成纳米纤维,进而纳米纤维通过层层自组装以及Ostwald熟化机理形成微米级AACH纤维。AACH fibers were sythesized using PEG as template and aluminium nitrate as aluminium source under hydrothermal conditions,and its growth mechanism was initially explored.The phase state,chemical structure,surface morphology of the sythesized AACH fibers were measured by means of XRD,SEM,TEM,TGA,DSC,FT-IR,respectively.The experimental results show that AACH fibers with diameter about 500 nm were synthesized,the release weight of gas is 56.32 wt% in AACH,length/width ratio of the fiber is 15-20.The phase transformation sequence was found to be AACH→amorphous Al2O3→γ-Al2O3→α-Al2O3＋θ-Al2O3→α-Al2O3.It is considered that the grow mechanism for AACH fiber is that the AACH nanocrystals grow into AACH nanofibers along the chains of PEG micelle via hydrogen bonding,the resulting AACH nanofibers aggregate into AACH microfibers through layer-by-layer self-assembly and Ostwald ripening mechanism.

关 键 词：碳酸铝铵纤维 水热法合成 生长机理 层层自组装 

分 类 号：TQ343.2[化学工程—化纤工业]