Hydroxyapatite Thin Films with Giant Electrical Polarization

被引：40

作者：

Fu, Cong ^{[1
,2
]}

Savino, Keith ^{[1
,2
]}

Gabrys, Paul ^{[1
,2
]}

Zeng, Aibin ^{[1
,2
,3
]}

Guan, Baohong ^{[1
,2
,4
]}

Olvera, Diana ^{[5
]}

Wang, Chenggong ^{[6
]}

Song, Boao ^{[1
,2
]}

Awad, Hani ^{[5
]}

Gao, Yongli ^{[6
]}

Yates, Matthew Z. ^{[1
,2
]}

机构：

[1] Univ Rochester, Dept Chem Engn, Rochester, NY 14627 USA

[2] Univ Rochester, Laser Energet Lab, Rochester, NY 14627 USA

[3] Hangzhou Wamdang Polytech, Dept Appl Engn, Hangzhou 310023, Zhejiang, Peoples R China

[4] Zhejiang Univ, Dept Environm Engn, Hangzhou 310058, Zhejiang, Peoples R China

[5] Univ Rochester, Ctr Musculoskeletal Res, Rochester, NY 14627 USA

[6] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

来源：

CHEMISTRY OF MATERIALS | 2015年 / 27卷 / 04期

基金：

美国国家科学基金会;

关键词：

Solutions - Bone - Ion exchange - Thin films - Electrodes - Calcium phosphate - Ferroelectric materials - Hydroxyapatite - Drug delivery;

D O I：

10.1021/cm503364s

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

It is demonstrated that hydroxyapatite, a type of calcium phosphate commonly found in bone tissue, retains surprisingly large stored charge when synthesized electrochemically from aqueous solution. Thin films of hydroxyapatite formed on titanium and stainless steel electrodes were found to display giant polarization with quasi-permanent stored charge in excess of 70 000 microcoulombs per square centimeter. The polarization of the hydroxyapatite film develops during synthesis as a result of field-induced changes in concentration of ionic reactants in the electrical double layer near the electrode surface. This novel mechanism of polarization during synthesis provides much larger stored charge than what is possible by postsynthesis poling of ferroelectric or electret materials. The polarized hydroxyapatite films on titanium are shown through in vitro experiments to hold promise in stimulating bone growth and may enable new applications in ion exchange separations, drug delivery, or energy storage.

引用

页码：1164 / 1171

页数：8

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