熟料粒度对骨粉/磷酸钙生物骨水泥结构与性能的影响

采用新方法首次将动物骨中的鱼骨引入到磷酸三钙和磷酸氢钙等原料体系中通过高温烧结制备磷酸钙基生物骨水泥（CPC）,以柠檬酸和柠檬酸钠的缓冲液为固化液、按一定的液固比制备固化试样,通过扫描电子显微分析（SEM）和力学性能测试等方法,研究了熟料粒度对其固化试样结构与抗压强度的影响.结果表明：制备过程中骨水泥粉末的粒度对其固化试样的微观结构及其抗压强度有着较为显著的影响,通过调整骨水泥粉末的粒度可达到优化其固化试样的微观结构和改善其力学性能的目的.     

磷酸钙陶瓷纤维的研究

用前驱体法制备出了磷酸钙陶瓷纤维，运用Ｘ－射线衍射仪、扫描电镜等测试手段，对磷酸钙纤维的组成进行了分析，结果表明：Ｎａ－Ａｌｇ（海藻酸钠）／Ｎａ４Ｐ２Ｏ７比和烧结温度等对纤维的矿物组成有很大影响。当ＮａＡｌｇ／Ｎａ４Ｐ２Ｏ７比大于２．８时，可以得到羟基磷灰石（ＨＡＰ）和缺钙型ＨＡＰ（ＤＨＡＰ）纤维；将ＨＡＰ＋ＤＨＡＰ纤维加热到１１００℃时，有β－ＴＣＰ产生，温度高于１２００℃时β－ＴＣＰ能形成稳定的α－ＴＣＰ。     

工业溶液中新生磷酸钙深沉的吸附特性研究

研究了新生磷酸钙深沉在工业溶液中对典型色素－焦糖、葡萄糖碱性降解物及类黑素的吸附特性。实验表明,新生磷酸钙沉淀对这类色素的吸附特性均属于Ｌａｎｇｍｉｕｒ型;温度升高时,新生磷酸钙沉淀对色素的吸附量均下降;溶液中存在原地新生儿磷酸钙沉淀的吸附能力有一定的影响。     

工业溶液中新生磷酸钙沉淀的吸附特性研究

研究了新生磷酸钙沉淀在工业溶液中对典型色素———焦糖、葡萄糖碱性降解物及类黑素的吸附特性。实验表明,新生磷酸钙沉淀对这类色素的吸附特性均属于Ｌａｎｇｍｉｕｒ 型;温度升高时,新生磷酸钙沉淀对色素的吸附量均下降;溶液中存在的蔗糖对新生磷酸钙沉淀的吸附能力有一定的影响     

掺铕稀土磷酸钙红色荧光粉的制备及其电荷补偿

采用高温固相法在1 200℃下制备了Ca3(PO4)2∶Eu3+红色荧光粉,并通过X射线衍射分析和荧光光谱分析表征,考察荧光粉的物相、发光性质以及激活剂Eu3+的最佳掺杂浓度,研究结果发现Eu3+取代Ca2+占据八面体中心格位,由于离子半径差异,产生大量晶格缺陷,影响其发光性能.为了进一步提高其发光强度,在荧光粉中引入了电荷补偿剂Na+.通过研究Na+浓度对荧光粉发光性质的影响,发现电荷补偿后荧光粉的发射强度是电荷补偿前发射强度的2.9倍左右,得到荧光粉最佳化学组成为Ca2.3Na0.4(PO4)2∶0.3Eu3+.根据缺陷的生成和反应原理,并结合晶体场环境的中心对称性变化,提出电荷补偿的微观机制主要包括缺陷反应以消除晶格畸变和降低晶格中心对称性以增强红光发射.     

Fabrication, in vitro Degradation and Cytotoxic Assay of Different Crystalline Phases Calcium Polyphosphate

Fabrication, in vitro degradation and cytotoxic assay of different crystalline phases calcium polyphosphate（CPP） were reported. The CPP ceramics were fabricated by crystallizing the amorptous frits, and sintered at 550℃ ,875℃, 1000℃ for 1 h to obtain the 7-CPP, β-CPP and α-CPP respectively. The efffects of the different crystalline phases on their weight loss and released PO4^3- were investigated during the degradation. And the surface change was observed by the SEM, The osteoblastic ROS17/2.8 cell line was used to estimate the cytotoxicity of CPP. The effects of CPP on cells ＇ proliferation were evaluated by using MTT assay. The experimental restdts showed that γ-CPP, β-CPP and α-CPP did not exert cytotoxic effect on the cells. In addition, the proliferation of the growth of ROS17/2.8 cells on β-CPP was optimal.     

Preparation of Laminin-apatite-polymer Composites Using Metastable Calcium Phosphate Solutions

A synthetic polymer with a laminin-apatite composite layer on its surface would be useful as a percutaneous device. The preparation of such a composite was attempted in the present study using poly（ ethylene terephthalate ） （PET） and polyethylene （PE） as the synthetic polymer. PET and PE plates and those pretreated with an oxygen plasma were alternately dipped in calcium and phosphate ion solutions, and then immersed in a metastable calcium phosphate solution supplemented with laminin （ LCP solution ）. The PET and PE plates pretreated with an oxygen plasma formed a uniform and continuous layer of a laminin-apatite composite on their surfaces. In contrast, the PET and PE plates that had not been pretreated with an oxygen plasma did not form a continuous layer of a laminin-apatite composite on their surfaces. The hydrophilic functional groups on the PET and PE surfaces introduced by the plasma treatment were responsible for the successful laminin-apatite coruposite coating.     

α-TCP/TECP双相磷酸钙的胶凝特性研究

主要研究了α-Ca3(PO4)2-Ca4(PO4)2O体系胶凝材料的凝结硬化及强度性质.研究表明,在实验条件下,该体系胶凝材料的凝固时间随粉料中TECP质量分数的增加而缩短.硬化体24h抗压强度与TECP质量分数的关系呈凸型曲线关系.当TECP质量分数为20%时,抗压强度最大为37.6MPa.此外,阐述了硬化体的XRD分析和SEM观察.     

Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance

Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance (PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation; and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance (C _s)—time curves. Foundation item: Project(2005CB623901) supported by the Major State Basic Research and Development Program of China     

偏磷酸钙生物活性玻璃陶瓷纤维的研究

以磷酸氢钙和磷酸为起始原料，对熔融ＣａＯ－Ｐ２Ｏ５系统玻璃进行一系列处理，得到了新型的磷酸钙质生物材料－主晶相为β－磷酸钙的生物活性玻璃陶瓷纤维，探讨了这种玻璃组成、热处理制度、洗涤制度对β－Ｃａ（ＰＯ３）２纤维数量及长径比的影响。