Coagel Prepared from Aqueous Octyl β -d-Galactoside Solution
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- 作者：Shigesaburo Ogawa ; Maito Koga ; Kouichi Asakura…
- 关键词：Coagel ; Krafft ; Alkyl glycoside ; Octyl β ; d ; galactoside ; Ribbon phase ; Semi ; crystalline network
- 刊名：Journal of Surfactants and Detergents
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：20
- 期：1
- 页码：255-261
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Industrial Chemistry/Chemical Engineering; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution; Surfaces and Interfaces, Thin Films; Polymer Sciences; Physical Chem
- 出版者：Springer Berlin Heidelberg
- ISSN：1558-9293
- 卷排序：20
文摘
Structuring of semi-crystalline networks in water systems is significant for a variety of industrial applications. In the present work, we investigated the coagel formation from aqueous octyl β-d-galactoside (C8-β-Gal) solutions and characterized the crystal structure and crystallite network in the prepared coagel. Differential scanning calorimetry (DSC) confirmed that the Krafft boundary temperature (TK) is 32–35 °C for C8-β-Gal concentrations below 30 wt% and a knee of the Krafft boundary exists around 2.5 wt% C8-β-Gal concentrations. The addition of NaCl increased TK slightly because of the salting-out effect. Powder X-ray diffraction (PXRD) analysis, field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) observations revealed that the coagel is comprised of the three dimensional bundled semi-crystalline network consisting of a “ribbon crystal phase” of hemihydrate crystals. Moreover, the excellent ability of C8-β-Gal to form a macroscopically homogeneous coagel was demonstrated by the comparison with other representative mono-alkylated glycoside’ systems containing octyl a-d-glucoside or dodecyl β-d-glucoside. Persistence of the liquid phase without liquid–liquid phase separation prior to and during the coagel formation was a key factor for the preparation. A novel coagel was obtained from a principal synthetic galactoside.