کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9783132 | 1511869 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ observation of hydroxyapatite nanocrystal formation from amorphous calcium phosphate in calcium-rich solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
The formation of hydroxyapatite (HAp) from amorphous calcium phosphate (ACP) was in situ observed in calcium-rich aqueous solutions (Ca/P molar ratios were 1.67, 1.83, and 2.0) by freeze-drying the precipitates withdrawn at selected time intervals during the reaction. As the more excess calcium ions exist in the solution, the HAp crystallization from ACP occurred more rapidly and the Ca/P molar ratio of the finally obtained precipitates increased to reach the stoichiometric value of 1.67. Acicular HAp nanocrystals grew from the inter-particle phase between the spherical particles within the ACP aggregates in an initial stage of the phase transformation. This observation is in favour of the view that the internal rearrangement process is responsible for the ACP-HAp transformation - it is against the opinion suggesting a dissolution-reprecipitation process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 91, Issues 2â3, 15 June 2005, Pages 500-506
Journal: Materials Chemistry and Physics - Volume 91, Issues 2â3, 15 June 2005, Pages 500-506
نویسندگان
Sujin Kim, Hyun-Seung Ryu, Hyunho Shin, Hyun Suk Jung, Kug Sun Hong,