纳米铋的表面改性研究  

Study on surface modification of bismuth nanoparticles

作　　者：罗洁[1] 卢业玉[1] 余林[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《无机盐工业》2012年第6期24-26,51,共4页Inorganic Chemicals Industry

摘　　要：测定了3种表面活性剂硬脂酸（SA）、油酸（0A）和十六烷基三甲基溴化铵（CTAB）在纳米铋表面的吸附量，进而选出最佳表面改性剂。研究了硬脂酸改性纳米铋粉各种因素对改性效果的影响，确定最佳工艺条件：改性剂用量为10％（相对于铋粉质量），pH为5N6，改性时间为1h。此条件下，改性后的纳米铋粉能在液体石蜡中润湿和分散，表明改性后粉体由亲水性变为亲油性。红外光谱（FT-IR）分析及X射线衍射（XRD）分析结果表明，硬脂酸有机长链基团成功地以化学键结合在纳米铋表面．改性后的铋粒子未发生晶型改变．只是粒径略有降低。The adsorption amounts of three types of surfactants, i.e.stearic acid （SA）, oleic acid （OA）, and cetyltrimethylam- monium bromide （CTAB）, on the surface of bismuth nanoparticles were investigated, in order to select the best surface modi- fier. Effects of various factors on modification of bismuth nanoparticles with stearic acid were discussed, and optimal modifi- cation conditions were obtained as follows：dosage of stearic acid was 10% （relative to thc mass of bismuth powder）, pH=5~6, and modification time was 1 h.Under these conditions,the modified bismuth nanoparticles had good wetting and dispersity in liquid paraffin and the powder was changed from hydrophilicity to hydrophobicity.FT-IR and XRD results showed the organic long-chain group of stearic acid grafted onto the surface of bismuth nanoparticles by chemical bonds ;the crystal type of bis- muth nanoparticles was not changed, but the grain diameter was decreased periodically.

关 键 词：纳米铋 吸附 硬脂酸 表面改性 

分 类 号：TQ135.32[化学工程—无机化工]