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A Method of Targeted Cell Isolation via Glass Surface Functionalization
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Facile and innovative method for bioglass surface modification: Optimization studies.

João Henrique Lopes1, Emanuella Maria Barreto Fonseca2, Italo O Mazali1

  • 1Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil.

Materials Science & Engineering. C, Materials for Biological Applications
|December 28, 2016
PubMed
Summary
This summary is machine-generated.

A novel molten salt bath method enhances bioglass surface reactivity by exchanging sodium ions for calcium ions. This creates a reactive shell on the BG45S5 bioglass, increasing its pH response for potential biomedical applications.

Keywords:
45S5 bioglassBioactivityCalcium ionIon exchangeSilicate glassSurface modification

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Bioglasses are crucial biomaterials for bone regeneration.
  • Modifying bioglass surfaces can enhance their bioactivity and performance.
  • Existing surface modification methods may have limitations in efficiency or selectivity.

Purpose of the Study:

  • To develop a facile and novel method for modifying the surface of BG45S5 bioglass.
  • To investigate the effects of calcium-ion exchange on the surface composition and structure of bioglass.
  • To evaluate the impact of surface modification on the reactivity and pH response of bioglass.

Main Methods:

  • Ion exchange using a molten salt bath of calcium nitrate and sodium nitrate at 480°C.
  • Optimization of ion exchange time using X-ray fluorescence (XRF) and X-ray diffraction (XRD).
  • Characterization of surface composition, morphology, and structure using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and solid-state nuclear magnetic resonance (29Si MAS-NMR).
  • Evaluation of pH changes in deionized water and HEPES-buffered solutions.

Main Results:

  • A core-shell bioglass system was successfully created with a modified surface layer.
  • Optimal ion exchange time of 30 minutes was determined, preserving the non-crystalline structure.
  • Surface modification led to increased formation of non-bridging oxygen (NBO) groups and depolymerization of the silicate network (decrease in Qn species).
  • The modified BG45Ca30 bioglass exhibited a significant increase in pH during early reaction stages compared to BG45S5.

Conclusions:

  • The molten salt bath ion exchange is an effective method for enhancing bioglass surface reactivity.
  • Surface modification with calcium ions alters the silicate network structure and increases surface activity.
  • The enhanced reactivity and pH response suggest potential for improved performance in biomedical applications.