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Coagel Prepared from Aqueous Octyl β -d-Galactoside Solution

  • Original Article
  • Published:
Journal of Surfactants and Detergents

Abstract

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 (T K) 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 T K 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.

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Abbreviations

AFM:

Atomic force microscopy

DSC:

Differential scanning calorimetry

T K :

Krafft boundary temperature

Z:

Number of formula units in the unit cell

C8-β-Gal:

Octyl β -d-galactoside

PXRD:

Powder X-ray diffraction

FE-SEM:

Field-emission scanning electron microscopy

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Acknowledgements

The authors gratefully acknowledge the financial support by the MEXT-Supported Program for the Strategic Research Foundation at Private Universities (S1201027) 2012–2016.

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Author notes

  1. Shigesaburo Ogawa

    Present address: Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, Musashino, Japan

  2. Maito Koga

    Present address: Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Japan

Authors and Affiliations

  1. School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan

    Shigesaburo Ogawa & Isao Takahashi

  2. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan

    Shigesaburo Ogawa, Maito Koga, Kouichi Asakura & Shuichi Osanai

Authors
  1. Shigesaburo Ogawa
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  2. Maito Koga
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  3. Kouichi Asakura
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Correspondence to Shigesaburo Ogawa.

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Ogawa, S., Koga, M., Asakura, K. et al. Coagel Prepared from Aqueous Octyl β -d-Galactoside Solution. J Surfact Deterg 20, 255–261 (2017). https://doi.org/10.1007/s11743-016-1894-8

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  • DOI: https://doi.org/10.1007/s11743-016-1894-8

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