埃洛石用于凝胶因子自组装和增强超分子凝胶的分析-application of halloysite in gel factor self-assembly and analysis of enhanced supramolecular gel.docxVIP

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埃洛石用于凝胶因子自组装和增强超分子凝胶的分析-application of halloysite in gel factor self-assembly and analysis of enhanced supramolecular gel.docx

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埃洛石用于凝胶因子自组装和增强超分子凝胶的分析-application of halloysite in gel factor self-assembly and analysis of enhanced supramolecular gel

AbstractHalloysite is a natural multi-walled nanotubes having a large hollow cavity that is a good space to conduct molecular confined study, and as a kind of inorganic clay mineral, halloysite can be used on the study of the molecular gel strength through appropriate modified.In this work, we choice DBS and cyclohexanone as gelator and solvent respectively, and prepare the DBS/cyclohexanone gel samples of the confined space within empty cavity of halloysite by mixed acid treatment, and compare the DSC and XRD data of this samples with that in bulk space. The results indicate that the gel-sol phase transition temperature of this samples prepared within confined space rose to 130.94°C in contrast to 97.35°C in bulk space. Lowest-energy molecular conformations of DBS were obtained by simulation software Spartan02, UV spectrum and FT-IR data proved that the main driving forces for DBS to form fibrils are π-π stacking of the benzene ring and hydrogen bonding. On this basis, we determine the position of a key by combining with large amounts of data, and thereby speculate the different manner for self-assembling of gelator DBS in body and confined space, and analysis the reason for the change on phase transition temperature.We dispersed certain amount KH550 modified halloysite (m-HNTs) in 1,2-propanediol or iso-butanol hot solution containing DBS by stirring and ultrasonic, and prepared a uniformly dispersed nanocomposite organic gel with good stability. At the same time, we prepared nanocomposite hydrogel by mixing the unmodified halloysite (HNTs) and sodium deoxycholate (NaDC) and solid NaCl at pH = 7 buffer solution. The compression test and rheology results of nanocomposite gel show that the strength of composite gel increase first and then decrease along with the increase on the added amount of m-HNTs (or HNTs). For instance, in DBS/1,2-propylene glycol/m-HNTs organic gel systems, the strength of the gel that m-HNTs were added in an amount of 5%is greater than that