无机材料学报Issue(2)：159-164,6.DOI:10.15541/jim20150293
不同尺寸COM、COD对阳离子表面活性剂CTAB的吸附性质差异
Adsorption of Cetyltrimethylammonium Bromide on Different-sized Calcium Oxalate Monohydrate and Dihydrate Crystals
摘要
Abstract
The aim of this study was to compare the adsorption difference of cetyltrimethylammonium bromide (CTAB) on nano/micron calcium oxalate monohydrate (COM) and dihydrate (COD) crystals, so as to explore the stone formation mechanism. The crystal phase transformation before and after adsorption was analyzed by XRD and FT-IR. Adsorbed amount of nano/micron COM and COD to CTAB was detected by colorimetry. Zeta potentials of crystals were measured by Zeta potential analyzer. The adsorption curves of large-sized COM and COD (3μm and 10μm) formed a platform with increase of c (CTAB), while the small-sized COM and COD (50 nm, 100 nm and 1 μm) showed linear-type. The adsorbed amounts of COM and COD crystals were reduced with increase of crystal size. Ad-sorbed amounts of CTAB on COM were more than COD with the same size, because CTAB is more likely to adsorb to the negative charges on the COM surface. In conclusion, adsorption of crystals is related to the specific surface area and crystal structure. The adsorption quantity, absolute values of zeta potential of crystals and electrostatic repul-sive-force are increased with the decrease of crystal size because of the increased specific surface area and exposed oxalate ions. The adsorption could inhibit the aggregation of urine crystals thus reduce the risk of calcium oxalate stone formation.关键词
晶体尺寸/阳离子表面活性剂/吸附模型/草酸钙Key words
crystal size/cationic surfactant/adsorption model/calcium oxalate分类
化学化工引用本文复制引用
甘琼枝,温小玲,丁一鸣,欧阳健明..不同尺寸COM、COD对阳离子表面活性剂CTAB的吸附性质差异[J].无机材料学报,2016,(2):159-164,6.基金项目
国家自然科学基金(21371077) National Natural Science Foundation of China(21371077) （21371077）
