Study of apatite layer formation on SBF-treated chitosan composite thin films

Surface modifications of thin films based on chitosan (Ch), pure Ch and either Ch/montmorillonite (MMT) or Ch/nanoclay composites, were characterised by infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Biominer...

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Bibliographic Details
Published in:Polymer testing 2018-10, Vol.71, p.173-181
Main Authors: Lewandowska, Katarzyna, Furtos, Gabriel
Format: Article
Language:English
Subjects:
Apatite
Atomic force microscopy
Biocompatibility
Biomedical materials
Biomineralisation
Body fluids
Chitosan
Clay
Composites
Degree of crystallinity
Fourier transforms
In vitro methods and tests
Infrared analysis
Infrared spectroscopy
Mineralization
Montmorillonite
Nanoclay
Polymers
Scanning electron microscopy
Submerging
Surface properties
Surface treatment
Surgical implants
Thermodynamic properties
Thermogravimetric analysis
Thin films
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Summary:Surface modifications of thin films based on chitosan (Ch), pure Ch and either Ch/montmorillonite (MMT) or Ch/nanoclay composites, were characterised by infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Biomineralisation of the Ch-based materials without any prior surface treatment was evaluated by immersing films in simulated body fluid (SBF) at 37 °C for 14 days. Samples were compared before and after soaking. Results obtained from SEM-EDX, AFM, and infrared spectroscopy (ATR-FTIR) were compared, and all prepared films showed growth of a new phase containing calcium. The composition of thin films influenced the amount of new phase formed as well as the degree of crystallinity of the newly formed phase. The largest increase was observed for the Ch composite with modified nanoclay. Moreover, increased growth of the new phase on the surface of films after immersion in SBF solution significantly influenced the thermal properties of the materials. •This paper focused on the development and characterisation of new thin films based on chitosan composites.•SEM-EDX and AFM microscopy and infrared spectroscopy showed growth of a new phases containing calcium in all prepared films.•The composition of thin films influenced the amount and crystallinity of new formed phases.•The largest increase was observed for chitosan composite with modified nanoclay (contains 25% of octadecylamine).•The new phase provides a thermal barrier and decreases mass loss.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2018.09.007