Journal
CRYSTAL GROWTH & DESIGN
Volume 12, Issue 5, Pages 2204-2212Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg200917y
Keywords
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Funding
- National Natural Science Foundation of China [81071272]
- National Basic Research Program of China [2011CB606201]
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The effects of poly(ethylene glycol) (PEG) molecular weights on nano hydroxyapatite (n-HA) crystal growth were studied, and a possible mechanism was proposed. n-HA crystals were synthesized in the presence of PEG with different molecular weights via hydrothermal method. Transmission electron microscopy (TEM) analysis showed that the presence of PEG increased the size of n-HA crystals; PEG with larger molecular weights produced larger n-HA crystals. High-resolution TEM observation indicated that all of the n-HA crystals tended to grow along the < 002 > axis. X-ray diffraction patterns showed that all of the samples consisted of only the HA phase. Besides, PEG increased the crystallinity of n-HA crystals, and this effect was more significant for PEGs with larger molecular weights. Fourier transform infrared results further revealed that all of the crystals were carbonated HA. Thermogravimetry/differential scanning calorimetry analysis detected PEG residues on n-HA particles mechanism of PEGs on n-HA crystal growth, n-HA samples heat-treated for various PEG20000, and a possible mechanism in which PEG modulated the growth of n-HA. To thoroughly study the modulating times were prepared in the presence of crystals was discussed.
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