Synthesis and characterization of needlelike apatitic nanocomposite with controlled aspect ratios
Synthesis and characterization of needlelike apatitic nanocomposite with controlled aspect ratios
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DOI：
10.1016/s0142-9612(03)00303-x
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发表时间：
2003-10-01
期刊：
影响因子：
14
通讯作者：
Liu, DM
中科院分区：
文献类型：
--
作者：
Liou, SC;Chen, SY;Liu, DM
缺钙磷灰石（cd-HA）晶体具有针状的核壳纳米结构，直径5- 10 nm，长度2080 nm。在不同pH值的水溶液中，以聚丙烯酸（PAA）为催化剂，通过原位合成法制备了聚丙烯酸（PAA）纳米复合材料。从9到11。研究了所得晶体的纳米结构，其显示出具有约Irim厚度的PAA壳薄层的核-壳构型。发现针状复合物的纵横比（AR）取决于PAA的浓度和溶液pH。在较低的溶液pH下，晶体生长被抑制，即，随着PAA浓度的增加，AR降低。而在较高的溶液pH下检测到增加的AR，表明cd-HA纳米晶体的优先生长。初步提出了这种优先生长的机制，并建议纠正PAA沿针状纳米粒子的长轴吸附。(C)2003爱思唯尔科技有限公司。保留所有权利。
Calcium-deficient apatitic (cd-HA) crystals with core-shell nanostructure with needlelike shape, 5-10nm in diameter and 2080 nm in length. were prepared via an in situ formation in the presence of polyacrylic acid (PAA) under aqueous solution of different pH values. ranging from 9 to 11. Nanostructure of the resulting crystals showing a core-shell configuration with a thin layer of PAA shell of about I rim thickness was investigated. Aspect ratio (AR) of the needlelike composite was found to depend on the concentration of the PAA and solution pH. At lower solution pH crystal growth was inhibited, i.e., leading to a decreased AR, with increase of PAA concentration. while an increased AR was detected at higher solution pH, suggesting a preferential growth of the cd-HA nanocrystals. Mechanism of such preferential growth was tentatively proposed and is suggested to correct PAA adsorption alone the long axis of the needlelike nanoparticles. (C) 2003 Elsevier Science Ltd. All rights reserved.