纳米羟基磷灰石/聚合物复合生物材料的制备方法研究进展

纳米羟基磷灰石是自然骨的主要组分之一,具有良好的生物相容性和生物活性,被广泛应用于骨组织的修复与替代材料。但是,由于材料本身力学性能较差制约了羟基磷灰石的进一步应用,且自然骨是由纳米羟基磷灰石和聚合物组成的天然复合材料,因此制备综合性能优越的羟基磷灰石/聚合物复合生物材料是当今研究的热点。综述了羟基磷灰石/聚合物复合生物材料的制备方法,并对其发展趋势进行了简单探讨。     

生物医用纳米羟基磷灰石的研究进展

纳米羟基磷灰石既具有纳米材料的特性,又具有羟基磷灰石本身的特性,在生物医学领域具有非常广阔的应用前景.本文详细介绍了纳米羟基磷灰石的历史发展、制备方法、表面改性及其在生物医用材料领域的应用.     

纳米HAP粉末的制备技术及其研究进展

羟基磷灰石具有重要的医学价值,简要介绍了羟基磷灰石的结构和性质,并综述了目前国内外制备纳米羟基磷灰石的技术及其进展情况,通过对这些制备技术的概括比较,提出了纳米羟基磷灰石在制备、应用等方面的未来发展方向.     

纳米掺锶羟基磷灰石及其在牙膏中的应用研究

采用化学沉淀法以金属锶元素取代纳米羟基磷灰石中的部分钙元素。可制得纳米掺锶羟基磷灰石；通过XRD、FTIR、TEM等手段，对纳米掺锶羟基磷灰石进行了结构分析；掺锶后提高了纳米掺锶羟基磷灰石的生物性能和使用性能，将其应用于牙膏，可以提高牙膏的使用功效作用，具有广阔的应用前景。     

纳米羟基磷灰石的制备、性能及在牙膏中的应用

介绍了纳米羟基磷灰石的制备方法，纳米羟基磷灰石在牙齿再矿化、牙齿脱敏和牙齿美白方面的性能及纳米羟基磷灰石在牙膏中的应用。     

纳米羟基磷灰石的制备方法研究进展

介绍了羟基磷灰石的应用和纳米羟基磷灰石的制备方法。总结了不同制备方法的优缺点,指出了寻找新的表面活性剂可以合成出性能更好的纳米羟基磷灰石。     

纳米级羟基磷灰石在牙膏中的应用研究

主要研究纳米级羟基磷灰石(Nano-HAP)在牙膏中的应用。通过抑菌试验与再矿化试验,分别研究其抗菌效果和对人工龋的再矿化效果。结果表明,纳米级羟基磷灰石(Nano-HAP)质量分数为5%时具有非常显著的抑制变形链球菌生长作用(P<0.01),含纳米级羟基磷灰石(Nano-HAP)质量分数为5%的牙膏对人工龋进行再矿化10 d后,牙釉质的显微硬度值得到非常显著的提高(P<0.01),对牙齿脱矿区有较好的再矿化作用。含纳米级羟基磷灰石(Nano-HAP)质量分数为5%的牙膏具有防龋效果。     

纳米羟基磷灰石合成及表面改性的途径和方法

综合论述了羟基磷灰石的晶体结构及表面结构特点,纳米羟基磷灰石的主要合成方法,同时通过对目前纳米羟基磷灰石颗粒表面改性研究现状的分析,提出了进行纳米HAP颗粒表面改性的几种主要方法.     

纳米羟基磷灰石及其复合材料技术进展

介绍了纳米羟基磷灰石制备和掺杂技术,以及纳米羟基磷灰石复合材料,包括它们在组织工程支架材料、缓控释药物载体、靶向药物传递及环境功能材料等方面的制备技术和应用,显示纳米羟基磷灰石及其复合材料在生物医学领域将会有良好发展前景。     

羟基磷灰石生物医用陶瓷材料的研究与发展

自然骨的主要无机矿物成分为纳米羟基磷灰石[Ca10（PO4）6（OH）2，HAP]针状晶体。人工合成的羟基磷灰石材料具有与自然矿物相似的结构，形态，成分，表现出良好的生物相容性和生物活性，广泛应用于医药和牙科领域。对近年来羟基磷灰石生物材料的制备和应用进行了综述。     

增强型聚乳酸纳米纤维复合支架的制备与表征

采用热致相分离法制备了纳米羟基磷灰石和壳聚糖纤维增强的聚乳酸复合支架。扫描电镜结果显示复合支架具有纳米纤维和微米孔隙共存的亚微观结构形态,利于细胞生长。孔隙率测定结果显示复合支架的孔隙率较高(>88%),满足组织工程用要求。力学性能测定结果显示复合支架的压缩模量有显著增加,与纯聚乳酸支架相比,复合支架压缩模量的最大值能增加2~3倍。     

以磷石膏为原料制备纳米羟基磷灰石的研究

借助正交设计法设计试验方案,以磷石膏为原料制备纳米羟基磷灰石,利用FT-IR、XRD、SEM等手段对样品进行结构表征与分析.试验结果表明:所制备出的纳米羟基磷灰石呈球形,其平均直径为97nm,且分散性好,大小均匀.     

Preparation and characterization of new nano-composite scaffolds loaded with vascular stents

In this study, vascular stents were fabricated from poly (lactide-ɛ-caprolactone)/collagen/nano-hydroxyapatite (PLCL/Col/nHA) by electrospinning, and the surface morphology and breaking strength were observed or measured through scanning electron microscopy and tensile tests. The anti-clotting properties of stents were evaluated for anticoagulation surfaces modified by the electrostatic layer-by-layer self-assembly technique. In addition, nano-composite scaffolds of poly (lactic-co-glycolic acid)/polycaprolactone/nano-hydroxyapatite (PLGA/PCL/nHA) loaded with the vascular stents were prepared by thermoforming-particle leaching and their basic performance and osteogenesis were tested in vitro and in vivo. The results show that the PLCL/Col/nHA stents and PLGA/PCL/nHA nano-composite scaffolds had good surface structures, mechanical properties, biocompatibility and could guide bone regeneration. These may provide a new way to build vascularized-tissue engineered bone to repair large bone defects in bone tissue engineering.     

纳米羟基磷灰石粉体的制备工艺

简要介绍了羟基磷灰石的结晶结构和其理化性质,综合论述了纳米羟基磷灰石的制备工艺及其原理。同时,对常用制备方法进行了比较,指出了目前纳米羟基磷灰石粉体制备存在的问题及今后的发展方向。     

The Effect of Temozolomide/Poly(lactide-co-glycolide) (PLGA)/Nano-Hydroxyapatite Microspheres on Glioma U87 Cells Behavior

In this study, we investigated the effects of temozolomide (TMZ)/Poly (lactide-co-glycolide)(PLGA)/nano-hydroxyapatite microspheres on the behavior of U87 glioma cells. The microspheres were fabricated by the "Solid/Water/Oil" method, and they were characterized by using X-Ray diffraction, scanning electron microscopy and differential scanning calorimetry. The proliferation, apoptosis and invasion of glioma cells were evaluated by MTT, flow cytometry assay and Transwell assay. The presence of the key invasive gene, α(V)β3 integrin, was detected by the RT-PCR and Western blot method. It was found that the temozolomide/PLGA/nano-hydroxyapatite microspheres have a significantly diminished initial burst of drug release, compared to the TMZ laden PLGA microspheres. Our results suggest they can significantly inhibit the proliferation and invasion of glioma cells, and induce their apoptosis. Additionally, α(V)β3 integrin was also reduced by the microspheres. These data suggest that by inhibiting the biological behavior of glioma cells in vitro, the newly designed temozolomide/PLGA/nano-hydroxyapatite microspheres, as controlled drug release carriers, have promising potential in treating glioma.     

一种新型复合医用乳胶膜的制备及其生物学性能研究

将纳米羟基磷灰石与天然胶乳复合,制备出羟基磷灰石/天然胶乳复合医用乳胶膜。采用广角X射线衍射（XRD）和透射电子显微镜（TEM）对纳米羟基磷灰石进行表征,结果表明与人体内羟基磷灰石纳米晶非常相似。对羟基磷灰石/天然胶乳复合医用乳胶膜的力学性能、蛋白质含量以及生物相容性进行的测试表明这是一种非常有前途的医用复合材料,有望获得广泛应用。     

The importance of chitosan and nano-TiHA in cement-type composites on the basis of calcium sulfate

The objective of this study was to combine titanium doped nano-hydroxyapatite with chitosan and calcium sulfate to obtain cement-type materials with improved cohesion and handling properties. It was proven that the presence of nano-TiHA influenced setting, hardening, microstructure and bioactivity of the cement samples. In the developed composites chitosan played a role of the cohesion promotor and created homogenous organic layers on the materials surfaces. Application of chitosan in acetic acid solution favorably delayed setting process of calcium sulfate dihydrate. The polymer combined with nano-TiHA and calcium sulfate improved handling and workability of the cements without diminishing their mechanical properties. It was suggested that the resorption rate of materials based on calcium sulfate can be optimized by addition of both titanium doped nano-hydroxyapatite and chitosan.     

氢氧化钙—磷酸钠体系沉淀法合成纳米羟基磷灰石

以固废磷化渣和NaOH为原料制得Na3PO4,再在超声波辅助下,采用化学沉淀法将Na3PO4溶液缓慢滴加到Ca(OH)2溶液中反应制备出纳米羟基磷灰石,并用FTIR、XRD和SEM等手段对羟基磷灰石进行表征分析。结果表明,在常温和超声波辅助条件下,Na3PO4溶液滴加速度为0.3 mL/min时,用无水乙醇洗涤沉淀物,可获得质量分数达99.5%、粒径为50 nm左右的高结晶度和高分散性纳米羟基磷灰石。