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Porous artificial bone scaffold synthesized from a facile in situ hydroxyapatite coating and crosslinking reaction of crystalline nanocellulose

Journal Article · · Materialia
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Nanjing Forestry Univ., Nanjing (China); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Nanjing Forestry Univ., Nanjing (China)
  5. Univ. of Tennessee, Knoxville, TN (United States); Univ. of Tennessee Institute of Agriculture, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Research into artificial bone scaffolds has increased substantially over the past decade as current solutions have significant limitations. Inspired by mineral hydroxyapatite (HAP) in natural bone, this study developed a facile in situ HAP coating on cellulose nanocrystals (CNCs) matrix followed by a crosslinking reaction. By changing the amount of CNCs added to a simulated body fluid (SBF), HAP content in the nanocomposite could be controlled between 0 and 40.1%, with a HAP coating thickness of ~10 nm. Moreover, CNCs/HAP was crosslinked with poly(methyl vinyl ether-alt-maleic acid) (PMVEMA) and polyethylene glycol (PEG) to enhance its water stability and mechanical properties. FTIR and NMR analysis revealed that crosslinking happened via an esterification reaction between CNCs, HAP, PMVEMA, and PEG. Compression strength of the scaffolds showed a result as high as 41.8 MPa, almost 20 times of scaffold prepared by just mixing CNCs and HAP. Further investigations revealed that this scaffold was highly porous (as high as 91.0%) and lightweight (with a density between 60-70 mg/cm3). In addition, this composite showed good biocompatibility as it can stabilize BSA protein, suggesting a promising material as a bone scaffold.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1489096
Journal Information:
Materialia, Journal Name: Materialia Journal Issue: C Vol. 4; ISSN 2589-1529
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

The Effect of Hydroxyapatite Prepared by In Situ Synthesis on the Properties of Poly(Vinyl Alcohol)/Cellulose Nanocrystals Biomaterial journal October 2019
Biomimetic composite scaffold from an in situ hydroxyapatite coating on cellulose nanocrystals journal January 2019


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