Hydroxyapatite with Permanent Electrical Polarization: Preparation, Characterization, and Response against Inorganic Adsorbates. Issue 14 (3rd May 2018)

• Record Type: Journal Article
• Authors: Rivas, Manuel; del Valle, Luis J.; Armelin, Elaine; Bertran, Oscar; Turon, Pau; Puiggalí, Jordi; Alemán, Carlos
• Is Part Of: Chemphyschem. Volume 19:Issue 14(2018)
• Page Start: 1746
• Page End: 1755
• Publication Date: 2018-05-03
• Subjects: Bioadsorption -- capacitance -- charge mobility -- electrocatalysis -- electrostimulation; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201800196
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Permanently polarized hydroxyapatite (HAp) particles have been prepared by applying a constant DC of 500 V at 1000 °C for 1 h to the sintered mineral. This process causes important chemical changes, as the formation of OH − defects (vacancies), the disappearance of hydrogenophosphate ions at the mineral surface layer, and structural variations reflected by the increment of the crystallinity. As a consequence, the electrochemical properties and electrical conductivity of the polarized mineral increase noticeably compared with as‐prepared and sintered samples. Moreover, these increments remain practically unaltered after several months. In addition, permanent polarization favours significantly the ability of HAp to adsorb inorganic bioadsorbates in comparison with as‐prepared and sintered samples. The adsorbates cause a significant increment of the electrochemical stability and electrical conductivity with respect to bare polarized HAp, which may have many implications for biomedical applications of permanently polarized HAp. Abstract : Permanently polarized hydroxyapatite – an electrocatalyst that yields amino acids by fixing N2, CH4, and CO2 – shows unique electrochemical and electrical properties, which are retained even after several months. The authors prove the material's noticeable ability to adsorb bioinorganic molecules, which enhances its electrochemical stability and electrical resistance. The results open new possibilities for biomedical applications.