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Hyaluronic acid — gelatin hydrogels as bioelectrets: Charge transport and dielectric polarization effects
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 3.1 ) Pub Date : 2020-10-01 , DOI: 10.1109/tdei.2020.008439 S. Kripotou , S. N. Tegopoulos , A. Kyritsis , Lluis Oliver Cervello , Ana Valles-Lluch , G. Gallego Ferrer
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 3.1 ) Pub Date : 2020-10-01 , DOI: 10.1109/tdei.2020.008439 S. Kripotou , S. N. Tegopoulos , A. Kyritsis , Lluis Oliver Cervello , Ana Valles-Lluch , G. Gallego Ferrer
In this work, we study the role of water molecules on the polarization processes activated on hyaluronic acid (HA), and gelatin (Gel) hydrogels at rather low hydration levels, by employing mainly broadband dielectric spectroscopy (BDS) and thermally stimulated depolarization currents (TSDC) technique. Our results suggest that the polarization capability of the hydrogels depends strongly on the water fraction, already at temperatures as low as −90 °C, and that charge (protons) long-range mobility is inevitably related with polarization processes in the biomaterials. The polarizabilty enhances strongly at temperatures above the onset temperature for structural rearrangements and conformational fluctuations in the hydrogels. At temperatures below this critical temperature, the polarizability is related to water secondary relaxation process (ν-process) and to polarization process within ice-like structures of hydration water. These findings imply that polarization effects in biomaterials are strongly affected by contributions due to hydration water (even for traces of water).
中文翻译:
透明质酸——明胶水凝胶作为生物驻极体:电荷传输和介电极化效应
在这项工作中,我们主要采用宽带介电光谱 (BDS) 和热刺激去极化电流,研究了水分子对透明质酸 (HA) 和明胶 (Gel) 水凝胶在相当低的水合水平上激活的极化过程的作用。 TSDC) 技术。我们的结果表明,水凝胶的极化能力在很大程度上取决于水的比例,在低至 -90 °C 的温度下,电荷(质子)的长程迁移率不可避免地与生物材料中的极化过程有关。极化率在高于起始温度的温度下强烈增强,用于水凝胶中的结构重排和构象波动。在低于这个临界温度的温度下,极化率与水的二次弛豫过程(ν-过程)和水合水的冰状结构内的极化过程有关。这些发现意味着生物材料中的极化效应受到水合水(即使是痕量水)的贡献的强烈影响。
更新日期:2020-10-01
中文翻译:
透明质酸——明胶水凝胶作为生物驻极体:电荷传输和介电极化效应
在这项工作中,我们主要采用宽带介电光谱 (BDS) 和热刺激去极化电流,研究了水分子对透明质酸 (HA) 和明胶 (Gel) 水凝胶在相当低的水合水平上激活的极化过程的作用。 TSDC) 技术。我们的结果表明,水凝胶的极化能力在很大程度上取决于水的比例,在低至 -90 °C 的温度下,电荷(质子)的长程迁移率不可避免地与生物材料中的极化过程有关。极化率在高于起始温度的温度下强烈增强,用于水凝胶中的结构重排和构象波动。在低于这个临界温度的温度下,极化率与水的二次弛豫过程(ν-过程)和水合水的冰状结构内的极化过程有关。这些发现意味着生物材料中的极化效应受到水合水(即使是痕量水)的贡献的强烈影响。