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

1Introduction Themostimportantrequirementofapercutaneous deviceisthepreventionofbacterialinfectionthroughtheinterfacebetweenthematerialandtheskin.Therefore,a percutaneousdevicehastoadherefirmlytoskintissueandpreventepidermaldowngrowth.Previously,Aokietalp…     

Preparation of Porous Calcium Phosphate Bioceramic

1Introduction Humanlongbonehasgradientstructure,whichis thattheouterlayeriscortical(ie,dense)boneandthe innerlayeristrabecular(ie,spongy)bone.Thecortical boneconsistsofcylindricalchannelsthatareheldtogether byaframeworkofhardtissue,mainlynaturalcalcium ph…     

一种新型蛋白质大分子印迹杂化聚合物微球的制备

采用反相悬浮法,通过引入磷酸氢二铵,制备了大分子印迹的磷酸钙/海藻酸钙(CP/CA)杂化微球.研究结果表明,采用本文的制备技术可以方便地获得球形和透明性良好的大分子印迹微球,并且湿态凝胶微球的表观机械强度优于纯海藻酸钙微球.红外光谱测试研究结果表明,微球中出现了新的杂化组分.紫外光谱对重结合行为的研究表明,大分子印迹微球的重结合容量得到显著提高.该基材可以作为一种新的蛋白质大分子印迹聚合物基材.     

Preparation of a Novel Calcium Phosphate Cement Using N-methylene Phosphonic Chitosan as a Gelling Agent

1Introduction Self hardeningcalciumphosphatecements(CPC)consistingoftetracalciumphosphate(TTCP)anddicalci umphosphate(DCPAorDCPD)havebeendeveloped since1986.ThereactionbetweenDCPAandTTCPis[1]:2CaHPO4 2Ca4(PO4)2OH2OCa10(PO4)6(OH)2.CPC isreadilyosseointegra…     

Preparation of a Novel Calcium Phosphate Cement Using N-methylene Phosphonic Chitosan as a Gelling Agent

A modified chitosan （ N-methylene phosphonic Chitosan, NMPC） was synthesized to improve solubility and ability to bind calcium ion. The properties of the raw material chitosan and its derivative NMPC were characterised using FTIR , ^1H- NMR . The aim of this study was to enhance the compressive CPC by reinforcing with NMPC. A formulation consisting of CPC powder , buffer solution and gelling agent was used for preparation of the CPC. CPC powder coasisted of tetracalcium phosphate（ TTCP ） and dicalcium phosphate anhydrous （ DCPA ）. NMPC which acted as the gelling ageut was dissohed into KH2PO4-Na2 HPO4 buffer solution. Each specimen in the mold was sandciched between two fritted glass sides and kept for 24 hours. Compressive strengths were determined, the setting product was identified using X-ray diffraction and scanning electron microscopy was used to investigate the hydroxyapatite particles size and porosity. The experimental results showed that the dominating influence on the compressive strengths of CPC-AMPC was the HA panicle size, its uniformity and appropriate porosity.     

Preparation and Luminescent Properties of Eu 3 Doped Calcium Phosphate Nanocrystalline

1Introduction TheapatiteswithgeneralformulaM5(PO4)3X(M beinganalkalinerareearthandXbeingahalogen,oxy genorhydroxylion)havebeenextensivelystudied,which permitsawiderangeofcationandanionsubstitutions,suchasNd3 [1],Yb3 [2],Pr3 [3,4],Tb3 [5],Eu3 [6,7]andCe3 […     

利用氯化石蜡副产盐酸制取沉淀磷酸钙

采用氯化石蜡副产盐酸制取沉淀磷酸钙的不去渣脱氟两段中和流程，重点对萃取磷酸液的脱氟、一段中和及ＣａＣｌ２的回收利用等工艺条件进行了研究，试验结果表明，利用此副产盐酸制取沉淀磷酸钙（饲肥比为６：４）在技术、经济上都是完全可行的。     

聚合磷酸钙骨水泥的制备和性能研究

采用丙烯酸和衣康酸的共聚物与自制磷酸钙粉末反应制备骨水泥。用自凝牙托水对类磷酸四钙（TTCP）粉末进行表面改性后所制备的骨水泥,初凝时间为4．5min,终凝时间为8.5min,抗压强度可达４２MPa。采用类TTCPα－磷酸三钙的混合粉料制备的骨水泥,初凝时间为５．５min,终凝时间为１１．０min,抗压强度可达４３MPa。     

Three-dimensionally Perforated Calcium Phosphate Ceramics

1Introduction Calciumphosphateceramicswithopenporousstruc tureandsufficientmechanicalstrengthareusefulfor combingmedicines,growthfactorsandcellswiththece ramicsbecausetheopenporescanbeusedasthespace forpreservingthesesubstancesandcells.However,most ofconv…     

镍钛合金表面含壳聚糖的钙磷复合涂层的仿生合成

将高浓度模拟体液5×SBF与壳聚糖溶液相互结合,在预处理后的镍钛合金基体上快速形成了含壳聚糖的钙磷复合涂层。电化学测试表明,钙磷涂层复合壳聚糖以后,阳极极化曲线中的钝化区变宽,击穿电位明显升高,涂层的抗腐蚀性增强。复合涂层在单倍模拟体液SBF中浸泡4d后,SEM、EDS对涂层的测试结果表明,复合涂层具有良好的生物活性。     

镍钛合金表面含壳聚糖的钙磷复合涂层的仿生合成

将高浓度模拟体液5×SBF与壳聚糖溶液相互结合,在预处理后的镍钛合金基体上快速形成了含壳聚糖的钙磷复合涂层。电化学测试表明,钙磷涂层复合壳聚糖以后,阳极极化曲线中的钝化区变宽,击穿电位明显升高,涂层的抗腐蚀性增强。复合涂层在单倍模拟体液SBF中浸泡4d后,SEM、EDS对涂层的测试结果表明,复合涂层具有良好的生物活性。     

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。     

可注射磷酸钙骨水泥的研究

可注射磷酸钙骨水泥具有良好的生物相容性、骨传导性、可降解性、易操作性及可塑性等优点，临床上可用于非负重部位骨缺损的修复、药物或生物因子载体、牙根管的充填、松质骨螺钉的加固以及骨折的固定等方面，在植入学、骨创伤学及放射介入学等领域中具有广泛的应用前景。目前可注射磷酸钙骨水泥已经成为骨水泥研究中的主要课题，就其最新研究进展进行了讨论。     

Preparation and Compressive Strength of Calcium Phosphate Bone Cement Containing N, O-carboxymethyl Chitosan

N, O-carboxymethyl chitosan （ CMCTS ）, a kind of biodegradable organic substance, was added to calcium phosphate bone cement （CPC） to prodnce a composite more similar in composition to human bone. The compressive strength of the new material was inereased by 10 times compared with conventional CPC.     

Preparation and Compressive Strength of Calcium Phosphate Bone Cement Containing N,O-carboxymethyl Chitosan

1Introduction Calciumphosphatebonecement(CPC)hasbeen preparedbyBrownandChowin1985[1].Thematerial consistsofcementpowderandbuffersolution.Thepow dercontainsteracalciumphosphate(TetCP)anddicalci umphosphate(DCPA).Thebuffersolutionismadeupof phosphateandwate…     

Calcium Phosphate Coating over Silk Fibroin Film by Biomimetic Methods

1Introduction Silkfibroin(SF)providesanimportantsetofmate rialoptionsforbiomaterialsandscaffoldsfortissueengi neeringbecauseofitsimpressivemechanicalproperties,biocompatibilityandbiodegradability[1].Tofabricateanorganic inorganiccompositescaffold forbonet…     

不同电源模式对电沉积磷酸钙涂层的影响

采用电化学沉积的方法在钛合金（Ti-6Al-4V）表面制备生物涂层．通过采用恒电流模式和脉冲电源模式考察不同的电源模式对电沉积磷酸钙涂层的影响．试验研究了不同电源模式对涂层的微观形貌及涂层厚度的影响．结果表明：脉冲电流下制备的涂层比恒电流条件下制备的涂层更为均匀致密．在同等的沉积条件下。脉冲电流制备的涂层厚度比恒电流条件制备的涂层厚度增加了16．2μm．XPD分析表明,电源模式的改变并没有影响磷酸钙的生成．     

AZ91D镁合金表面环保型钙系磷化膜的制备及其耐蚀性

采用化学转化处理的方法,在AZ91D镁合金的表面制备了均匀致密的钙系磷化膜,其中磷化液配方中不含铬、氟及亚硝酸盐等对环境有害的离子。通过场发射扫描电子显微镜和X射线衍射仪研究了磷化时间及温度对磷化膜结构和相组成的影响。结果表明:磷化时间为20min,磷化温度为40℃时,所得到的磷化膜的致密性和均匀性较好。与空白基体相比,经磷化处理后的镁合金在3.5%NaCl溶液中的耐腐蚀性能明显提高。     

Ca（OH）2和H3PO4制备β—Ca3（PO4）2生物陶瓷粉末的研究

对 Ｃａ（ Ｏ Ｈ）２ － Ｈ３ Ｐ Ｏ４ － Ｈ２ Ｏ 直接沉淀法制取β－ Ｃａ３（ Ｐ Ｏ４）２（β－ Ｔ Ｃ Ｐ 的溶液体系以及非化学计量磷灰石的热行为和 Ｃａ Ｈ Ｐ Ｏ４·２ Ｈ２ Ｏ 与 Ｃａ（ Ｏ Ｈ）２ 的热反应等进行了热力分析,提出制备β－ Ｔ Ｃ Ｐ 生物陶瓷粉末的新工艺,解决了湿法制备β－ Ｔ Ｃ Ｐ 工艺中长期存在的固液难以分离的难题,所制得的陶瓷粉末经元素分析和 Ｘ 射线衍射谱分析,表明为 Ｃａ／ Ｐ＝ １ ．５０９ 的无杂相高纯β－ Ｔ Ｃ Ｐ