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The nickel nanoparticles with different sizes and spherical shape were prepared by the reduction of nickel sulfate with sodium borohydride in the water-in-oil emulsions of water/SDBS(sodium dodecylbenzene sulfonate)/n-pentanol/n-heptane. The effects of aging time, molar ratio of water to SDBS(R) and the concentration of nickel sulfate on the size of particles were studied. The samples were characterized by transmission electron microscopy(TEM) and inductively coupled plasma spectrometry(ICP). The results show that the average particle size changes from 20 to 40 nm by adjusting aging time (15-30 min) and R (9-11.5). The concentration of nickel sulfate of 1.0 mol/L is the favorite condition. 相似文献
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在AOT/正庚烷/氯金酸反相微乳液中,用水合肼作为还原剂制备了纳米金粒子, 用紫外-可见光谱和透射电镜进行分析,系统地研究了水和表面活性剂摩尔比 (ω=nH2O/nAOT)以及氯金酸浓度对粒径的影响。结果表明, 制备的纳米金粒子粒径在4~12 nm、单分散性好。纳米金粒径与ω值存在线性关系。氯金酸的浓度对粒径的影响比较复杂, 随着浓度增大, 粒径先减小后增大。用FT-IR红外光谱解释了AOT的磺酸基对纳米金粒子表面有强烈的吸附作用,从而对合成的纳米金粒子有着很强的保护作用 相似文献
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微乳中界面聚合法制备包载胰岛素纳米胶囊 总被引:4,自引:0,他引:4
通过界面聚合法,以嵌段共聚物表面活性剂作为乳化剂得到结构紧密的微乳液,在该微乳液中制备聚氰基丙烯酸乙酯(PECA)纳米胶囊,产物粒径较小(约100 nm),与作为模板的微乳液液滴大小相对应.微乳组成对纳米胶囊粒径影响较大.微乳聚合所得聚氰基丙烯酸乙酯纳米胶囊对胰岛素的包裹率较大,最大超过90%.同时考察了胰岛素从纳米胶囊中的释放行为. 相似文献
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