發(fā)布時間：2018-06-20 04:23

  本文選題：高嶺石-絲氨酸 + 形成��； 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：高嶺石是一種常見的1：l層狀硅酸鹽材料,其插層復(fù)合物在醫(yī)藥、電化學(xué)、高分子納米聚合物、催化以及美容護(hù)膚領(lǐng)域具有巨大的應(yīng)用前景,但是只有極少數(shù)的有機(jī)小分子能夠直接插層高嶺石,大部分的其他分子都要合適的前驅(qū)體經(jīng)過液相置換法進(jìn)入,以環(huán)境友好型的(1001=0.84 nm水合高嶺石為預(yù)插層體,制備時間短且工藝簡單。本文在查閱大量的國內(nèi)外文獻(xiàn)基礎(chǔ)上,綜述了高嶺石插層復(fù)合物及其應(yīng)用的研究現(xiàn)狀,尤其是在醫(yī)藥方面和美容護(hù)膚方面的應(yīng)用,并與插層分子絲氨酸的醫(yī)藥功能和美容護(hù)膚功能結(jié)合。本文主要分別以高嶺石-乙二醇插層復(fù)合物和d001=1.0 nm水合高嶺石為插層前驅(qū)體,制備了高嶺石-絲氨酸插層復(fù)合物并對其形成過程和機(jī)理進(jìn)行了研究,具體如下：通過液相置換法成功地制備了高嶺石-絲氨酸插層復(fù)合物,并通過掃描電鏡、X射線衍射、傅里葉紅外光譜對其進(jìn)行了表征。結(jié)果表明,絲氨酸能夠通過置換客體分子乙二醇或水插入高嶺石層間,不能直接插層高嶺石。經(jīng)過絲氨酸分子的插層,高嶺石的厚度從原先的30 nm減小至大約14 nm,層間距從0.72nm擴(kuò)大至1.13 nm,絲氨酸以單層分子在高嶺石層間分布,并形成盡可能多的氫鍵,高嶺石羥基基團(tuán)與絲氨酸的COO-,高嶺石Si-O層與絲氨酸的NH3+分別形成氫鍵,并且絲氨酸的-OH基團(tuán)很有可能嵌入高嶺石Si-O層的(SiO)6六方孔洞,與高嶺石的內(nèi)羥基作用。插層前驅(qū)體中的乙二醇分子和水分子分別將高嶺石原石的層間距擴(kuò)大1.08 nm和1.0 nm,便于絲氨酸分子的插層,客體分子在高溫下很容易脫嵌,在被絲氨酸分子取代之前脫嵌的激活能Ea控制了高嶺石-絲氨酸的含量,乙二醇的Ea為6.95 kJ/mol,水分子的Ea為21.2 kJ/mol,分別基于α=0.9-8.6exp(-6.95/T)和α=0.4-564.2exp(-21.2/T)。所以后者的插層率為85%,是前者45%的1.8倍。另外,高嶺石-環(huán)絲氨酸插層復(fù)合物通過與絲氨酸一樣的方法成功形成,并表現(xiàn)出極為相似的性質(zhì),所以高嶺石-絲氨酸在醫(yī)藥方面和美容護(hù)膚方面具有很大的應(yīng)用潛力。
[Abstract]:Kaolinite is a kind of common 1: l layered silicate material. Its intercalation compound has great application prospect in medicine, electrochemistry, polymer nano-polymer, catalysis and beauty care. But only a very small number of organic molecules can intercalate kaolinite directly, and most of the other molecules need suitable precursors to enter through the liquid phase displacement process, with the environmentally friendly kaolinite hydrated at 0.84 nm as the pre-intercalation. The preparation time is short and the process is simple. Based on a large number of literatures at home and abroad, this paper reviews the research status of kaolinite intercalation composites and their applications, especially in medicine and beauty care. It is combined with the medical function of intercalated molecular serine and the function of beauty and skin care. In this paper, the kaolinite-serine intercalation complex was prepared by using kaolinite ethylene glycol intercalation complex and d001 1. 0 nm hydrated kaolinite as intercalation precursor. The formation process and mechanism of kaolinite serine intercalation complex were studied. The main results are as follows: the kaolinite-serine intercalation complex was successfully prepared by liquid phase replacement method and characterized by scanning electron microscopy (SEM) X-ray diffraction and Fourier transform infrared spectroscopy (FTIR). The results showed that serine could not intercalate kaolinite directly by replacing guest molecule ethylene glycol or water into the interlayer of kaolinite. Through the intercalation of serine molecules, the thickness of kaolinite is reduced from 30 nm to about 14 nm, and the interlayer spacing is extended from 0.72nm to 1.13 nm. Serine distributes as monolayer between kaolinite layers and forms as many hydrogen bonds as possible. The hydroxyl groups of kaolinite and serine, kaolinite Si-O layer and serine NH _ 3 respectively form hydrogen bonds, and the -OH group of serine is likely to be embedded in the Si-O layer of kaolinite's Si-O layer and intercalated with the hexagonal pore of kaolinite, which acts with the inner hydroxyl of kaolinite. Ethylene glycol and water molecules in the intercalation precursor expand the interlayer spacing of kaolinite by 1.08 nm and 1.0 nm, respectively, so as to facilitate the intercalation of serine molecules. The activation energy (EA) of kaolinite and serine was controlled by the activation energy EA before being replaced by serine molecule. The EA of ethylene glycol was 6.95 kJ / mol, and the EA of water molecule was 21.2 kJ / mol, based on 偽 -0.9-8.6exp-6.95 / T) and 偽 -0.4-564.2exp-21.2 / T ~ (-1 / T), respectively. So the intercalation rate of the latter is 85%, 1.8 times that of the former 45%. In addition, kaolinite-cyclic serine intercalation complex was successfully formed by the same method as serine, and showed very similar properties, so kaolinite-serine has great application potential in medicine and beauty care.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

【參考文獻(xiàn)】

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本文編號：2042938