合作客戶/
拜耳公司 |
同濟(jì)大學(xué) |
聯(lián)合大學(xué) |
美國保潔 |
美國強(qiáng)生 |
瑞士羅氏 |
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水和乙二醇-水混合體系中的離子液體-陽離子表面活性劑混合膠束自聚焦-電導(dǎo)法 表面張立法和光譜研究法—
來源：上海謂載 瀏覽 1828 次 發(fā)布時(shí)間:2021-12-16
4.結(jié)論
觀察到，十六烷基-3-甲基咪唑氯化銨（CET+[C10min][Cl]）和純[C10min][Cl]的混合體系中，西三胺的cmc值介于純[C10min][Cl]和CET之間。在混合體系中，cmc值隨著[C10min][Cl]摩爾分?jǐn)?shù)的增加而增加，證實(shí)其形成膠束的趨勢(shì)小于純表面活性劑分子。cmc值也隨著溶液中DEG體積百分比的增加而增加，這是由于隨著溶劑極性的降低，表面活性劑的疏溶劑性降低。cmc b cmc*、βb 0和（f1和f2）b 1的觀察值清楚地表明了混合物的非理想行為，并且還表明混合膠束中CET和[C10min][Cl]分子之間存在比純組分更強(qiáng)的相互作用。純組分和混合物的ΔGm值均為負(fù)值，表明膠束形成是熱力學(xué)自發(fā)的。ΔGad 0的負(fù)值大于ΔGm0的負(fù)值表明，在空氣-溶液界面的吸附比在本體溶液中形成膠束更有利。由表面張力法計(jì)算的Γmax和Amin值對(duì)于確定表面活性劑分子在氣液界面的排列非常有用。Γmax值為我們提供了關(guān)于液/氣界面吸附效率的信息，該值隨著溶液中DEG體積百分比的增加而降低。DEG實(shí)際上在界面上與混合表面活性劑系統(tǒng)競爭，因此減少了其數(shù)量，從而降低了吸附效率。此外，P的值為b0。33，表明形成的膠束/混合膠束本質(zhì)上是球形的。從紫外-可見光譜可以得出結(jié)論，[C10min][Cl]與CET形成混合膠束，這從存在和不存在[C10min][Cl]時(shí)的cmc值可以清楚地看出。在cmc以下，大部分離子對(duì)形成，但一旦達(dá)到cmc，這些離子對(duì)就會(huì)轉(zhuǎn)變?yōu)閇C10min][Cl]/CET混合膠束和可溶性染料分子。
致謝
U.Farooq感謝UGC以BSR（基礎(chǔ)科學(xué)研究）的形式提供獎(jiǎng)學(xué)金，N.A.Malik感謝化學(xué)系主任、伊斯蘭教理工大學(xué)（IIST）、Awantipora、普拉瑪、J＆K等提供必要的設(shè)施。
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