含羧/酯基有机分子对氧化铝微粒形态调控作用研究

Shape-controlled Synthesis of Alumina Nanoparticles by Carboxy-containing Organic Molecules

研究了液相法制备纳米微粒过程中 ,某些含羧 /酯基有机分子 (乙酸、乙酰乙酸乙酯、聚酰胺羧酸盐等 )分别在水相和有机相中对氧化铝纳米微粒形态的调控作用 ,通过选择该类有机物的种类和用量 ,制备了不同粒径范围的球形和不同长径比的纤维状 Al2 O3纳米粒子 。

Shape\|control has been much more difficult to be achieved in the synthesis of nanoparticles. For the aim to establish whether a favorable combination of functional organic molecules and inorganic precursors might produce predictable particle morphology, several carboxy\|containing organic compounds, such as acetic acid(AcOH), acetoacetic ester(EAA), poly(amidoamine)dendrimer(PAMAM) and the like, have been investigated in both organic solvent and aqueous solution in the synthesis of Al\-2O\-3 nanoparticles from aluminium alkoxide and aluminium nitrate precursors, respectively. The spherical particles with different size\|ranges(<10 nm, 20\_40 nm, 50\_100 nm), and the fibrous with changed aspect ratios(from \{100 nm/4\} nm to 10 nm/4 nm) were observed and characterized, whose distribution was dependent on the property of organic compounds and its concentration used. A possible shape\|control mechanism was proposed and discussed.