title: Molecular dynamics simulations for the examination of mechanical properties of hydroxyapatite/ poly α-n-butyl cyanoacrylate under additive manufacturing.
abstract: Molecular dynamics (MD) simulations emerged to be a helpful tool in the field of material science. In rapid prototyping artificial bone scaffolds process, the binder spraying volume and mechanism are very important for bone scaffolds mechanical properties. In this study, we applied MD simulations to investigating the binding energy of α-n-butyl cyanoacrylate (NBCA) on Hydroxyapatite (HA) crystallographic planes (001, 100 and 110), and to calculating and analyzing the mechanical properties and radial distribution function of the HA(110)/NBCA mixed system. The simulation results suggested that HA (110) has the highest binding energy with NBCA owing to the high planar atom density, and the mechanical properties of HA(110)/NBCA mixed system is stronger than pure HA system. Therefore, the multi-grade strength bone scaffold could be fabricated through spraying various volume NBCA binders during 3D printing process. By calculating the radial distribution function of HA(110)/NBCA, the essence of the interface interaction were successfully elucidated. The forming situation parameters can be referred to calculation results. There exists a strong interaction between HA crystallographic plane (110) and NBCA, it is mainly derived from the hydrogen bonds between O atoms which connect with C atoms of NBCA and H atoms in HA crystal. Furthermore, a strong adsorption effect can be demonstrated between HA and NBCA.
authors.affiliation: The Mechatronics School, Northwestern Polytechnical University, Xi'an, 710072, P.R. China.
authors.forename: Yanen
authors.initials: Y
authors.lastname: Wang
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Wei
authors.forename: Feilong
authors.initials: F
authors.lastname: Pan
authors.forename: Mingming
authors.initials: M
authors.lastname: Yang
authors.forename: Shengmin
authors.initials: S
authors.lastname: Wei
mesh_terms: D001842:Bone and Bones; D002244:Carbon / Q000737:chemistry; D003198:Computer Simulation; D018360:Crystallography, X-Ray; D017886:Durapatite / Q000737:chemistry*; D004659:Enbucrilate / Q000737:chemistry*; D006801:Humans; D006860:Hydrogen Bonding; D021621:Imaging, Three-Dimensional; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D011108:Polymers / Q000737:chemistry; D011208:Powders; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D023822:Tissue Engineering; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D011108:Polymers; D011208:Powders; D002244:Carbon; D017886:Durapatite; D004659:Enbucrilate
keywords: Molecular dynamics simulation; binding energy; hydroxyapatite; mechanical properties; poly α-n-butyl cyanoacrylate; radial distribution function