Controllable synthesis of hydroxyapatite nanocrystals via a dendrimer-assisted hydrothermal process

Journal Article · Tue Sep 04 04:00:00 EDT 2007 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2006.11.041· OSTI ID:21000698

Zhuohua, Zhou ^[1]; Zhou, Ping-Le ^[1]; Shiping, Yang ^[1]; Xibin, Yu ^[1]; Liangzhun, Yang ^[1]

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1. Department of Chemistry, Shanghai Normal University, Shanghai 200234 (China)

The morphology and size of hydroxyapatite Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2} (denoted HAP) can be controlled under hydrothermal treatment assisted with different dendrimers, such as carboxylic terminated poly(amidoamine) (PAMAM) and polyhydroxy terminated PAMAM. The structure and morphology were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and transmission electron microscopy (TEM). IR spectra were also used to investigate the complexation of Ca{sup 2+} with PAMAM. The results revealed that the inner cores of the PAMAM dendrimers are hydrophilic and potentially open to calcium ions, since interior nitrogen moieties serve as complexation sites, especially in case of the polyhydroxy terminated PAMAM. And the reasonable mechanism of crystallization was proposed that it can be attributed to the localization of nucleation site: external or interior PAMAM. Additionally, the PAMAM dendrimer with carboxylic and polyhydroxy groups has an effective influence on the size and shape of hydroxyapatite (HAP) nanostructures. Different crystal morphology was accomplished by adsorption of different dendrimers onto specific faces of growing crystals, altering the relative growth rates of the different crystallographic faces and leading to different crystal habits.

• OSTI ID: 21000698
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 9 Vol. 42; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ADSORPTION
APATITES
CALCIUM IONS
CHEMICAL PREPARATION
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALLIZATION
CRYSTALLOGRAPHY
CRYSTALS
INFRARED SPECTRA
MORPHOLOGY
NANOSTRUCTURES
NITROGEN
NUCLEATION
PHOSPHATES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION