DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses
Bioactive glasses have recently been extensively used to replace, regenerate, and repair hard tissues in the human body because of their ability to bond with living tissue. In this work, the effects of replacing Na<sub>2</sub>O with MgO on the electrical, biosolubility, and thermal prope...
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2021-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/10/2626 |
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| author | Natalia Anna Wójcik Sharafat Ali Jakub Lech Karczewski Bo Jonson Michał Bartmański Ryszard Jan Barczyński |
| author_facet | Natalia Anna Wójcik Sharafat Ali Jakub Lech Karczewski Bo Jonson Michał Bartmański Ryszard Jan Barczyński |
| author_sort | Natalia Anna Wójcik |
| collection | DOAJ |
| description | Bioactive glasses have recently been extensively used to replace, regenerate, and repair hard tissues in the human body because of their ability to bond with living tissue. In this work, the effects of replacing Na<sub>2</sub>O with MgO on the electrical, biosolubility, and thermal properties of the target glass 10Na<sub>2</sub>O–60P<sub>2</sub>O<sub>5</sub>–30CaO (in mol%) were investigated. The electrical properties of the glasses were studied with the impedance spectroscopy technique. At 473 K, DC conductivity values decreased from 4.21 × 10<sup>−11</sup> to 4.21 × 10<sup>−12</sup> S cm<sup>−1</sup> after complete substitution of MgO for Na<sub>2</sub>O. All samples had a similar activation energy of the DC conduction process ~1.27 eV. Conduction mechanisms were found to be due to hop of ions: Na<sup>+</sup>, Mg<sup>2+</sup><sub>,</sub> and probable H<sup>+</sup>. FTIR analysis showed that, as the Mg content increased, the Q<sup>2</sup> unit (PO<sub>2</sub><sup>−</sup>) shifted towards higher wavenumbers. The proportion of Q<sup>3</sup> unit (P<sub>2</sub>O<sub>5</sub>) decreased in the glass structure. This confirmed that the replacement of Na<sup>+</sup> by Mg<sup>2+</sup> was accompanied by concurrent polymerization of the calcium–phosphate glass network. The biosolubility test in the phosphate-buffered saline solution showed that the magnesium addition enhanced the biosolubility properties of Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> glasses by increasing their dissolution rate and supporting forming CaP-rich layers on the surface. The glass transition temperature increased, and thermal stability decreased substantially upon substitution of Na<sub>2</sub>O by MgO. |
| first_indexed | 2024-03-10T11:20:19Z |
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| id | doaj.art-ba990109460c487c85f6c57d485e2706 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:20:19Z |
| publishDate | 2021-05-01 |
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| spelling | doaj.art-ba990109460c487c85f6c57d485e27062023-11-21T20:08:50ZengMDPI AGMaterials1996-19442021-05-011410262610.3390/ma14102626DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> GlassesNatalia Anna Wójcik0Sharafat Ali1Jakub Lech Karczewski2Bo Jonson3Michał Bartmański4Ryszard Jan Barczyński5Advanced Materials Center, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, PolandDepartment of Built Environment and Energy Technology, Linnaeus University, 35195 Växjö, SwedenAdvanced Materials Center, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, PolandDepartment of Built Environment and Energy Technology, Linnaeus University, 35195 Växjö, SwedenAdvanced Materials Center, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, PolandAdvanced Materials Center, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, PolandBioactive glasses have recently been extensively used to replace, regenerate, and repair hard tissues in the human body because of their ability to bond with living tissue. In this work, the effects of replacing Na<sub>2</sub>O with MgO on the electrical, biosolubility, and thermal properties of the target glass 10Na<sub>2</sub>O–60P<sub>2</sub>O<sub>5</sub>–30CaO (in mol%) were investigated. The electrical properties of the glasses were studied with the impedance spectroscopy technique. At 473 K, DC conductivity values decreased from 4.21 × 10<sup>−11</sup> to 4.21 × 10<sup>−12</sup> S cm<sup>−1</sup> after complete substitution of MgO for Na<sub>2</sub>O. All samples had a similar activation energy of the DC conduction process ~1.27 eV. Conduction mechanisms were found to be due to hop of ions: Na<sup>+</sup>, Mg<sup>2+</sup><sub>,</sub> and probable H<sup>+</sup>. FTIR analysis showed that, as the Mg content increased, the Q<sup>2</sup> unit (PO<sub>2</sub><sup>−</sup>) shifted towards higher wavenumbers. The proportion of Q<sup>3</sup> unit (P<sub>2</sub>O<sub>5</sub>) decreased in the glass structure. This confirmed that the replacement of Na<sup>+</sup> by Mg<sup>2+</sup> was accompanied by concurrent polymerization of the calcium–phosphate glass network. The biosolubility test in the phosphate-buffered saline solution showed that the magnesium addition enhanced the biosolubility properties of Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> glasses by increasing their dissolution rate and supporting forming CaP-rich layers on the surface. The glass transition temperature increased, and thermal stability decreased substantially upon substitution of Na<sub>2</sub>O by MgO.https://www.mdpi.com/1996-1944/14/10/2626calcium–phosphate glassFTIRimpedance spectroscopybiosolubilitythermal properties |
| spellingShingle | Natalia Anna Wójcik Sharafat Ali Jakub Lech Karczewski Bo Jonson Michał Bartmański Ryszard Jan Barczyński DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses Materials calcium–phosphate glass FTIR impedance spectroscopy biosolubility thermal properties |
| title | DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses |
| title_full | DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses |
| title_fullStr | DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses |
| title_full_unstemmed | DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses |
| title_short | DC and AC Conductivity, Biosolubility and Thermal Properties of Mg-Doped Na<sub>2</sub>O–CaO–P<sub>2</sub>O<sub>5</sub> Glasses |
| title_sort | dc and ac conductivity biosolubility and thermal properties of mg doped na sub 2 sub o cao p sub 2 sub o sub 5 sub glasses |
| topic | calcium–phosphate glass FTIR impedance spectroscopy biosolubility thermal properties |
| url | https://www.mdpi.com/1996-1944/14/10/2626 |
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