3D printing of Pickering emulsion inks to construct poly(D,L-lactide-co-trimethylene carbonate)-based porous bioactive s
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3D printing of Pickering emulsion inks to construct poly(D,L-lactide-co-trimethylene carbonate)-based porous bioactive scaffolds with shape memory effect Jingguang Wang1, Huichang Gao2, Yang Hu1,* , Naiyue Zhang1, Wuyi Zhou1, Chaoyang Wang3, Bernard P. Binks4,*, and Zhuohong Yang1,5,* 1
Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China 2 School of Medicine, South China University of Technology, Guangzhou 510006, China 3 Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China 4 Department of Chemistry, University of Hull, Hull HU6 7RX, UK 5 Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province, Guangzhou 510640, China
Received: 9 May 2020
ABSTRACT
Accepted: 8 September 2020
Biocompatible and bioactive scaffolds with multiscale porosity, shape memory effect and drug delivery performance are highly promising in bone tissue engineering applications within the approach of minimally invasive surgical implantation. In this study, we report an effective method to fabricate multiscale porous bioactive (MPB) scaffolds with shape memory effect by freeze drying of 3D printed high internal phase Pickering emulsion (Pickering HIPE) templates stabilized by hydrophobically modified hydroxyapatite and silica nanoparticles. MPB scaffolds containing a shape memory polymer matrix of poly(D,L-lactideco-trimethylene carbonate) display high porosity and fully interconnected filament networks with multiscale pore structures. The in vitro biomineralization study verifies that MPB scaffolds are bioactive with the apatite formation ability. The thermal property testing shows that the glass transition temperature of MPB scaffolds is easily tuned to fall between 45.9 and 49.1 °C by varying the HIPE composition. Moreover, MPB scaffolds exhibit observable shape memory properties with fast shape recovery. The antibacterial drug enrofloxacin can be efficiently loaded into MPB scaffolds and then released in a sustained manner displaying effective antimicrobial effect. Furthermore, cell culture assays confirm that MPB scaffolds could sustain the cell growth, proliferation and osteogenic differentiation, indicating the cytocompatibility and osteoinduction activity of MPB scaffolds. Therefore, combining freeze drying with 3D printing
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Annela M. Seddon. Jingguang Wang and Huichang Gao have contributed equally to this work.
Address correspondence to E-mail: [email protected]; [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05318-7
J Mater Sci
of Pickering HIPE templates paves the way towards MPB scaffolds with shape memory effect, which are promising as minimally invasive implantation scaffolds in bone tissue engineering applications.
GRAPHIC ABSTRACT
Introduction Bone defect is a serious public health issue, which is often ca
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