Miculescu Florin, Maidaniuc Andreea, Miculescu Marian, Dan Batalu Nicolae, Cătălin Ciocoiu Robert, Voicu Ştefan Ioan, Stan George E, Thakur Vijay Kumar
Faculty of Material Science and Engineering, Metallic Material Science, Physical Metallurgy Department, Politehnica University of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
Faculty of Applied Chemistry and Materials Science, Department of Analytical Chemistry and Environmental Engineering, Politehnica University of Bucharest, 1-7 Gheorghe Polizu, 060042 Bucharest, Romania.
ACS Omega. 2018 Jan 31;3(1):1338-1349. doi: 10.1021/acsomega.7b01855.
Hydroxyapatite-starch composites solidify rapidly via jellification, making them suitable candidates for robocasting. However, many aspects related to hydroxyapatite powder characteristics, hydroxyapatite-starch interaction, and composites composition and properties need to be aligned with robocasting requirements to achieve a notable improvement in the functionality of printed scaffolds intended for bone regeneration. This article presents a preliminary evaluation of hydroxyapatite-starch microcomposites. Thermal analysis of the starting powders was performed for predicting composites' behavior during heat-induced densification. Also, morphology, mechanical properties, and hydroxyapatite-starch interaction were evaluated for the jellified composites and the porous bodies obtained after conventional sintering, for different starch additions, and for ceramic particle size distributions. The results indicate that starch could be used for hydroxyapatite consolidation in limited quantities, whereas the composites shall be processed under controlled temperature. Due to a different mechanical behavior induced by particle size and geometry, a wide particle size distribution of hydroxyapatite powder is recommended for further robocasting ink development.
羟基磷灰石-淀粉复合材料通过胶凝作用迅速固化，使其成为用于机器人铸造的合适候选材料。然而，许多与羟基磷灰石粉末特性、羟基磷灰石-淀粉相互作用以及复合材料组成和性能相关的方面需要与机器人铸造要求相匹配，以显著改善用于骨再生的打印支架的功能。本文对羟基磷灰石-淀粉微复合材料进行了初步评估。对起始粉末进行热分析以预测复合材料在热诱导致密化过程中的行为。此外，还对胶凝复合材料以及常规烧结后获得的多孔体、不同淀粉添加量以及陶瓷颗粒尺寸分布的复合材料的形态、力学性能和羟基磷灰石-淀粉相互作用进行了评估。结果表明，淀粉可用于有限量的羟基磷灰石固结，而复合材料应在受控温度下加工。由于颗粒尺寸和几何形状引起的不同力学行为，建议使用宽颗粒尺寸分布的羟基磷灰石粉末用于进一步开发机器人铸造墨水。
