化学论文精选.doc

论文题目:甲基紫与十二烷基硫酸钠的相互作用的研究 本科生姓名:金林仟 指导教师: 刘玉香 摘 要 甲基紫和十二烷基硫酸钠的反应已有过很多的动力学和光谱学上的研究，动力学研究表明它为一个离子对形成过程。在没有表面活性剂存在时，甲基紫的吸收光谱可分解为两个子带，分别为以k=552nm为中心和以k=582nm为中心的子带。当存在表面活性剂时，又形成了两条新的子带，分别为以k=528nm为中心和以k=625nm为中心的子带。随着表面活性剂的浓度的增大，使得各子带所包含的面积也不断增大，直至表面活性剂的浓度为1.0×10-3M，之后随着浓度的增大不断减小。当[SDS]=8.0×10-3M时，随着SDS浓度的变化，实验没有明显的变化。这一现象可能是染料与表面活性剂单体形成了离子对产生的。并且存在一个预胶束化聚合浓度，它导致SDS-MV+离子对的破坏。之后，再增加SDS的浓度，将产生胶团，染料分子附着在胶团表面。 关 键 词：甲基紫，，， 论文类型：研究型 Subject : Spectroscopic and kinetic investigation of the interaction between methyl violet and sodium dodecylsulfate Specialty : Chemical Engineering And Technology Name : Hou Chunxiao (Signature) Instructor: Liang Yaodong (Signature) ABSTRACT The interaction between methyl violet (MV) and SDS has been kinetically and spectroscopically studied. Kinetic results are consistent with an ion-pair formation process. In the absence of surfactant, the CV absorption spectrum is decomposed in two sub-bands centred at k = 552nm and k = 5582nm. In the presence of SDS we observe the formation of two new sub-bands centredat k = 528 nm and k = 625 nm. The addition of surfactant results in an increase of the area of these subbands until they reach a maximum value for [SDS]=1×10-3M and, afterwards diminish. At [SDS] =8×10-3M there are no significant changes related to SDS addition. This behaviour has been explained considering the formation of ionic pairs between dye and SDS monomers. At one SDS concentration, the premicellar aggregation results in a destruction of SDS-CV+ ionic pairs. Later, an increase of SDS concentration yields the micelle formation and the dye incorporation on the micellar surface. Key words: methyl violet,sodium dodecylsulfate,sodium hydroxide,mixed acid Papers types: Investigative Study 目 录 第一章 文 献 综 述 1 1.1 碱性染料 1 1.1.1 甲基紫 1 1.1.2 甲基紫的结构和用途 2 1.2 阴离子表面活性剂 3 1.2.1 表面活性剂的性质和应用 4 1.2.2 SDS的结构和用途 5 1.3 紫