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本实验从理论和试验方面研究了头发与天然染料苏木精之间的相互作用，为天然染料的配方和染发工艺提供理论依据。主要内容如下： 1）建立了不同pH值下苏木精紫外吸光度与浓度之间的相互关系，求出中性条件下头发与天然染料之间相互作用的吉布斯自由能变化、焓变及熵变。结果表明，在所测温度范围内，苏木精在头发上的吸附基本满足Langmuir等温吸附关系式，求得吉布斯自由能变化和焓变均小于零，系统的熵变大于零。 2）利用量化软件考察了苏木精与头发模型的相互作用，发现苏木精与肽键相互作用时，主要通过肽键头发分子片段上的羰基与苏木精分子发生作用。计算结果表明，系统的吉布斯自由能变化和焓变均小于零，系统的熵变大于零，与试验结果一致。 |
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2楼2010-06-04 18:25:34
ag_mirabel
银虫 (初入文坛)
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wypward(金币+2):欢迎新虫，谢谢参与 2010-06-06 10:27:09
gaohaiyan(金币+30, 翻译EPI+1):很好，谢谢 2010-06-07 11:58:47
wypward(金币+2):欢迎新虫，谢谢参与 2010-06-06 10:27:09
gaohaiyan(金币+30, 翻译EPI+1):很好，谢谢 2010-06-07 11:58:47
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The experiment investigates how hair interact with hematoxylin, a natural dye, pratically and theoretically, which provides theoretical foundation for ingredients of natural dyes and coloring process. The gists are as follows: 1.Relation between adsorption of hematoxylin and concentration under varios pH is determined, including changes in Gibbs free energy, enthalpy and entropy of the interaction between hair and the natural dye under neutral condition. The results shows that during the scope of temperature in experiment, the adsorption of hematoxylin on hair basically agrees with Langmuir adsorption isotherm formula. Both Gibbs free energy change and enthalpy change are less than 0, while entropy change is more than 0. 2.With the help of software of quantum chemistry, investigation of the model of the interaction between hematoxylin and hair reveals that it occurs through the carbonyl group of peptide bond of hair interacts with hematoxylin. The calculation shows that both Gibbs free energy change and enthalpy change are less than 0, while entropy change is more than 0. This accords with the experimental result. |
3楼2010-06-05 21:37:20