This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Open AccessArticle
Structural and Dynamical Effects of the CaO/SrO Substitution in Bioactive Glasses
by
Margit Fabian
Margit Fabian 1,
Matthew Krzystyniak
Matthew Krzystyniak 2,*,
Atul Khanna
Atul Khanna 3 and
Zsolt Kovacs
Zsolt Kovacs 4
1
HUN-REN Centre for Energy Research, Konkoly Thege Miklos st. 29-33, 1121 Budapest, Hungary
2
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
3
Department of Physics, Guru Nanak Dev University, Amritsar 143005, India
4
Department of Materials Physics, Institute of Physics, Eötvös Loránd University, Pázmány Péter st. 1/a, H-1117 Budapest, Hungary
*
Author to whom correspondence should be addressed.
Molecules 2024, 29(19), 4720; https://doi.org/10.3390/molecules29194720 (registering DOI)
Submission received: 12 August 2024
/
Revised: 2 October 2024
/
Accepted: 3 October 2024
/
Published: 5 October 2024
Abstract
Silicate glasses containing silicon, sodium, phosphorous, and calcium have the ability to promote bone regeneration and biodegrade as new tissue is generated. Recently, it has been suggested that adding SrO can benefit tissue growth and silicate glass dissolution. Motivated by these recent developments, the effect of SrO/CaO–CaO/SrO substitution on the local structure and dynamics of Si-Na-P-Ca-O oxide glasses has been studied in this work. Differential thermal analysis has been performed to determine the thermal stability of the glasses after the addition of strontium. The local structure has been studied by neutron diffraction augmented by Reverse Monte Carlo simulation, and the local dynamics by neutron Compton scattering and Raman spectroscopy. Differential thermal analysis has shown that SrO-containing glasses have lower glass transition, melting, and crystallisation temperatures. Moreover, the addition of the Sr2+ ions decreased the thermal stability of the glass structure. The total neutron diffraction augmented by the RMC simulation revealed that Sr played a similar role as Ca in the glass structure when substituted on a molar basis. The bond length and the coordination number distributions of the network modifiers and network formers did not change when SrO (x = 0.125, 0.25) was substituted for CaO (25-x). However, the network connectivity increased in glass with 12.5 mol% CaO due to the increased length of the Si-O-Si interconnected chain. The analysis of Raman spectra revealed that substituting CaO with SrO in the glass structure dramatically enhances the intensity of the high-frequency band of 1110–2000 cm−1. For all glasses under investigation, the changes in the relative intensities of Raman bands and the distributions of the bond lengths and coordination numbers upon the SrO substitution were correlated with the values of the widths of nuclear momentum distributions of Si, Na, P, Ca, O, and Sr. The widths of nuclear momentum distributions were observed to soften compared to the values observed and simulated in their parent metal-oxide crystals. The widths of nuclear momentum distributions, obtained from fitting the experimental data to neutron Compton spectra, were related to the amount of disorder of effective force constants acting on individual atomic species in the glasses.
Share and Cite
MDPI and ACS Style
Fabian, M.; Krzystyniak, M.; Khanna, A.; Kovacs, Z.
Structural and Dynamical Effects of the CaO/SrO Substitution in Bioactive Glasses. Molecules 2024, 29, 4720.
https://doi.org/10.3390/molecules29194720
AMA Style
Fabian M, Krzystyniak M, Khanna A, Kovacs Z.
Structural and Dynamical Effects of the CaO/SrO Substitution in Bioactive Glasses. Molecules. 2024; 29(19):4720.
https://doi.org/10.3390/molecules29194720
Chicago/Turabian Style
Fabian, Margit, Matthew Krzystyniak, Atul Khanna, and Zsolt Kovacs.
2024. "Structural and Dynamical Effects of the CaO/SrO Substitution in Bioactive Glasses" Molecules 29, no. 19: 4720.
https://doi.org/10.3390/molecules29194720
Article Metrics
Article Access Statistics
For more information on the journal statistics, click
here.
Multiple requests from the same IP address are counted as one view.