Effect of cetyltrimethylammonium bromide on morphology and porous structure of mesoporous hydroxyapatite  

CTAB对于介孔羟基磷灰石形貌和孔结构的影响（英文）

作　　者：王晶[1] 黄苏萍[1] 胡堃[1] 周科朝[1] 孙虹[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学湘雅医院耳鼻喉头颈外科,长沙410008

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第2期483-489,共7页中国有色金属学报（英文版）

基　　金：Projects(51102285,81170912)supported by the National Natural Science Foundation of China;Project supported by the Open Foundation of State Key Laboratory of Powder Metallurgy,China

摘　　要：The mesoporous hydroxyapatite （HA） was synthesized by hydrothermal method utilizing cationic surfactant cetyltrimethylammonium bromide （CTAB） as template. The crystalline phase, morphology and porous structure were characterized respectively by different detecting techniques. The results reveal that the particles are highly crystalline hydroxyapatite phase. The surfactant has little influence on the morphology of the crystals, but affects the porous structure obviously. The sample without CTAB has a low surface area not exceeding 33 m^2/g, and no distinct pores can be observed by TEM. While the samples obtained with the surfactant get better parameters. Numerous open-ended pores centered at 2-7 nm spread unequally on the surface of the hydroxyapatite nanorods. The N2 adsorption-desorption experiments show type IV isotherms with distinct hysteresis loops, illustrating the presence of mesoporous structure. When the mole ratio of CTAB to HA is 1：2, the sample has the largest surface area of 97.1 m^2/g and pore volume of 0.466 cm^3/g.以阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）为模板剂，采用水热法合成介孔羟基磷灰石，并利用不同检测手段对其物相、形貌和孔结构进行表征。结果表明，合成物是高度结晶的羟基磷灰石相。表面活性剂对催化剂晶粒的形貌影响较小，但明显影响孔结构的形成。无表面活性剂存在时晶粒的比表面积较小（≤33m^2／g），，通过TEM无法观察到明显的孔结构。而对于有表面活性剂存在时合成的样品，可以看到许多孔径大小为2～7mm的开孔，不均匀地分布在羟基磷灰石纳米棒的表面。氮气吸附一脱附实验得到的均为吸附Ⅳ型等温线，并伴有明显的滞后环，证实了介孔结构的存在。当CTAB与羟基磷灰石的摩尔比为1：2时，样品的比表面积与孔容最大，其比表面积为97．1m^2／g，孔容为0．466cm^3／g。

关 键 词：HYDROXYAPATITE cetyltrimethylammonium bromide cationic surfactant soft-template mesoporous structure 

分 类 号：TB383.4[一般工业技术—材料科学与工程]