Thermal diffusion of aqueous solution of acetylated dextran: The effect of hydrophobicity using optical beam deflection technique

Dueramae I.; Yoneyama M.; Shinyashiki N.; Yagihara S.; Kita R.

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Thermal diffusion of aqueous solution of acetylated dextran: The effect of hydrophobicity using optical beam deflection technique

机译：乙酰化右旋糖酐水溶液的热扩散：光束偏转技术对疏水性的影响

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The effect of hydrophobicity on thermal diffusion of acetylated dextran in aqueous solution was studied in the temperature range of 15-50 degrees C by optical beam deflection (OBD) technique. The hydrophobicity was controlled by substitution of hydroxyl groups on dextran chain with acetylated groups. The Soret coefficient S-T and thermal diffusion coefficient D-T significantly increased with an increase of temperature. The hydrophobicity plays an important role in the thermal diffusion behavior, i.e. S-T and D-T switch the sign from negative to positive magnitude with an increase of hydrophobic contents. We observed a correlation between the parameters obtained from lacopini and Piazza equation (Europhy. Lett. 63 (2003) 247-253.) and the hydrophobic content of the binary aqueous solutions. A master curve can be used to describe the temperature dependence of ST and D-T for acetylated samples. The ST linearly decreases with an increase of particle size for dextran whereas it scales linearly with the volume of particles for acetylated samples. (C) 2018 Elsevier Ltd. All rights reserved.

机译：通过光束偏转（OBD）技术研究了疏水性对乙酰化葡聚糖在水溶液中热扩散的影响，温度范围为15-50摄氏度。通过用乙酰化基团取代右旋糖酐链上的羟基来控制疏水性。 Soret系数S-T和热扩散系数D-T随着温度的升高而显着增加。疏水性在热扩散行为中起重要作用，即，随着疏水含量的增加，S-T和D-T将符号从负值切换为正值。我们观察到从lacopini和Piazza方程（Europhy。Lett。63（2003）247-253。）获得的参数与二元水溶液的疏水含量之间的相关性。主曲线可用于描述乙酰化样品的ST和D-T的温度依赖性。对于右旋糖酐，ST随粒径的增加而线性减小，而对于乙酰化样品，ST随颗粒的体积呈线性比例。（C）2018 Elsevier Ltd.保留所有权利。

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来源
《International Journal of Heat and Mass Transfer》 |2019年第4期|997-1003|共7页
作者
Dueramae I.; Yoneyama M.; Shinyashiki N.; Yagihara S.; Kita R.;
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作者单位

Tokai Univ, Micro Nano Technol Ctr, Hiratsuka, Kanagawa 2591292, Japan;

Gunma Univ, Fac Sci & Technol, Kiryu, Gunma 3768515, Japan;

Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan;

Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan;

Tokai Univ, Micro Nano Technol Ctr, Hiratsuka, Kanagawa 2591292, Japan|Tokai Univ, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Thermal diffusion; Ludwig-Soret effect; Acetylated dextran; Aqueous solution; Hydrophobicity;

机译：热扩散Ludwig-Soret效应乙酰化葡聚糖水溶液疏水性;

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Thermal diffusion of aqueous solution of acetylated dextran: The effect of hydrophobicity using optical beam deflection technique

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