| 阴离子、阳离子和非离子表面活性剂在纳/微米草酸钙晶体上的吸附差异 |
| Differences in Adsorption of Anionic, Cationic and Nonionic Surfactant on Micron/nano Calcium Oxalate Monohydrate and Dihydrate Crystals |
|
| 摘要: 研究了尺寸分别为50 nm和3 μm的一水草酸钙（COM）和二水草酸钙（COD）晶体对不同电荷表面活性剂的吸附差异，包括阴离子型表面活性剂磺基琥珀酸钠二辛酯（AOT）、阳离子型表面活性剂十六烷基三甲基溴化铵（CTAB）和非离子型表面活性剂壬基酚聚氧乙烯醚（NP-40），探究了尿液中带不同电荷的分子对纳米、微米尿微晶的影响。结果表明，表面活性剂的吸附量大小为AOT > CTAB > NP-40，即阴离子型表面活性剂的吸附量最大，非离子型表面活性剂的吸附量最小；晶体尺寸相同时，COM的吸附能力稍大于COD；吸附表面活性剂后，晶体表面的ζ电位绝对值都增大，有利于抑制晶体的团聚和沉降。提出了晶体吸附不同表面活性剂的分子模型。不同电荷表面活性剂与纳/微米COM、COD晶体之间存在不同的相互作用。表面活性剂吸附量越大，沉降越慢，对晶体悬浮液的稳定效果越明显。 |
| 关键词: 晶体尺寸 阴离子表面活性剂 阳离子表面活性剂 非离子表面活性剂 吸附模型 草酸钙 |
| 基金项目: 国家自然科学基金（No.21371077）资助项目。 |
| Abstract: In order to explore the effect of urine components with different charges on micron/nano urinary crystallites, the adsorption difference of three surfactants with different charges onto micron/nano calcium oxalate monohydrate (COM) and dihydrate (COD) was studied, including anionic surfactant sodium diisooctyl sulfosuccinate (AOT), cationic surfactant cetyltrimethylammonium bromide (CTAB), and nonionic surfactant nonylphenol ethoxylate (NP-40). The adsorption quantity of surfactants on COM and COD was ranked in the following order:AOT > CTAB > NP-40, that is, the absorption quantity of anionic surfactant is the maximum, and absorption quantity of nonionic surfactant is the minimum. The adsorption quantity of COM was greater than COD with the same size; the absolute value of ζ potential on surface of COM and COD was increased after adsorption of surfactants, it was conducive to inhibit crystal aggregation and sedimentation. The molecular models of surfactants adsorbed on crystal surface were proposed. There are different interactions between micro/nano COM, COD crystal and anionic, cationic, nonionic surfactants. The larger the adsorption quantity of surfactants is, the slower the sedimentation rate is, so the stabilizing effect on crystal suspension is more obvious. |
| Keywords: crystal size anionic surfactant cationic surfactant nonionic surfactant adsorption model calcium oxalate |
| 投稿时间：2016-04-16 修订日期：2016-09-09 |
| 摘要点击次数: 3158 |
| 全文下载次数: 2278 |
| 温小玲,丁一鸣,欧阳健明.阴离子、阳离子和非离子表面活性剂在纳/微米草酸钙晶体上的吸附差异[J].无机化学学报,2016,32(12):2102-2108. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
