期刊
RSC ADVANCES
卷 4, 期 48, 页码 25234-25240出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra02925a
关键词
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资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2012R1A2A2A02046367]
- Converging Research Center Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-50210]
- Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [201320200000420]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20132020000420] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012R1A2A2A02046367] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper introduces a facile method for synthesizing a new structured hydroxyapatite [HAp, Ca-10(PO4)(6)(OH)(2)] material, named yolk-shell, by a simple spray drying process. The spray-dried precursor powders, consisting of Ca and P salts and dextrin, are transformed into powders of yolk-shell HAp by a simple combustion process under an oxygen atmosphere. For comparison, filled-structure HAp powders are prepared by spray pyrolysis in the absence of dextrin. A few small apatite crystals are found to be formed on the surfaces of the filled-structure HAp grains after 7 days of soaking in simulated body fluid (SBF). On the other hand, small acicular apatite crystals are observed on the yolk-shell grain surfaces after only 9 hours of soaking in SBF. The entire specimen surface is covered by numerous acicular and newly-formed hydroxyl carbonate apatite crystals after 1 day of soaking. These crystals are observed both at the outer and inner surfaces of the shell and the outer surface of the core. Inductively coupled plasma analysis shows that the dissolution of calcium and hydroxyl ions from yolk-shell HAp is notably increased compared with a filled-structure HAp. These results indicate that yolk-shell-structured HAp powders possess an enhanced in vitro bioactivity, which is encouraging for its potential use as a bone grafting material.
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