Three-dimensional nanocomposite scaffolds with ordered cylindrical orthogonal pores

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Silica reinforcement enhances the mechanical properties of hydrogels, particularly in their rubbery state.
• Developing scaffolds with controlled porosity is crucial for various applications, including tissue engineering.

Purpose of the Study:

• To present a method for preparing hydrogel-silica hybrid nanocomposite scaffolds with a well-ordered array of cylindrical pores.
• To investigate the mechanical properties and structural integrity of these novel scaffolds.

Main Methods:

• Fabrication of a biphasic matrix using poly(2-hydroxyethyl acrylate) (PHEA) hydrogel and a silica network via tetraethoxysilane (TEOS) sol-gel process.
• Utilized stacked polyamide 6 fabrics as a porogenic template, employing compression and sintering.
• Characterized porosity, dynamic mechanical response, and silica network continuity through pyrolysis and atomic force microscopy (AFM).

Main Results:

• The developed method successfully yielded scaffolds with a well-ordered array of cylindrical pores.
• Pyrolysis confirmed the continuity of the silica network, with the residue maintaining the pore structure.
• AFM revealed a silica structure composed of particle aggregates in the tens of nanometers, and X-ray microanalysis indicated homogeneity at the micrometer scale.

Conclusions:

• The presented method enables the fabrication of robust, ordered porous hydrogel-silica hybrid nanocomposite scaffolds.
• The continuous silica network contributes to the structural integrity and mechanical enhancement of the scaffolds.
• These findings offer a promising approach for designing advanced biomaterials with tailored properties.