Jingxiao Liu
材料科学技术（英文）
Chitosan-hydroxyapatite (CS-HA) composite powders were synthesized via in situ co-precipitation method, through the reaction of Ca(NO3)2 and H3PO4 in the simulated body fluid (SBF) containing appropriate amount of chitosan. The thermal evolution, microstructure and morphology were studied by TG-DTA (thermogravimetry-differential thermal analysis), XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy) and TEM (transmission electron microscopy). The in vitro bioactivity test showed that the obtained CS-HA composites had higher capability of inducing calcium ions deposition. Effects of CS-HA composites on the bioactivity and compressive strength of bioglass bone cement were investigated. The results indicated that the bioactivity of bioglass bone cement could be improved further when CS-HA composite powders were added into the cement, and appropriate amount of CS-HA additive was favorable for compressive strength improvement of bioglass bone cement.
关键词:
Hydroxyapatite
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null
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null
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null
Zude FENG
,
Qishen SU
,
Zuochen LI
材料科学技术（英文）
Hydroxyapatite (HAP) coatings were deposited onto titanium substrates by electrophoretic deposition (EPD) from ethanol. The results indicated that the addition of very small amount of HCl resulted in a decrease in the aging time as well as the suspension concentration required to obtain a coating. In addition, the results revealed the existence of a critical saturated voltage (Vsat), which had significant effect on the quality of deposition. The mean interfacial shear strengths of HAP coatings after sintering were found to be greater than 13MPa.
关键词:
Hydroxyapatite
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null
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null
倪昕晔
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汤晓斌
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林涛
,
赵全娣
,
耿长冉
,
蔡雷铭
,
顾卫东
,
缪云良
,
陈达
新型炭材料
为了提高等离子喷涂法所制羟基磷灰石涂层与炭/炭复合材料的结合力,采用氩气等离子体预处理结合等离子体喷涂法在炭/炭基体表面制备羟基磷灰石涂层,采用扫描电镜、X射线衍射仪、红外光谱仪、划痕仪等研究羟基磷灰石涂层的形貌、相组成以及羟基磷灰石涂层与基体的结合力.结果表明:采用或不采用等离子体处理炭/炭复合材料,羟基磷灰石涂层形貌和相组成接近,羟基磷灰石涂层的临界载荷分别为14.0 N、8.9N,前者比后者临界载荷提高了57.3％.采用等离子体处理可提高等离子体喷涂羟基磷灰石涂层与炭/炭复合材料基体的结合力.
关键词:
炭/炭复合材料
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氩气
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等离子
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羟基磷灰石
赵昆峰
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乔波涛
,
张彦杰
,
王军虎
催化学报
doi:10.1016/S1872-2067(12)60590-7
近期我们报道了Au/FeOx-羟基磷灰石(HAP,Ca10(PO4)6(OH)2)催化剂应用于CO氧化反应的研究结果,该催化剂不仅具有很高的低温CO氧化活性和反应稳定性,同时也具有很好的高温抗烧结性能,即使600 ℃焙烧后依然能够维持很好的CO氧化反应活性.为了进一步研究Au/FeOx-HAP催化CO氧化反应中HAP和FeOx的作用,本文对该催化剂进行了更加深入的表征.X射线光电子能谱结果表明,HAP能与Au和FeOx形成强相互作用,进而在高温条件下稳定Au和Feq纳米粒子.根据原位漫反射红外结果,Feq则主要通过改变反应路径和中间产物的方式起到促进催化剂CO氧化活性的作用.结合透射电镜,穆斯堡尔谱和原位漫反射红外结果可知,Au/FeOx-HAP催化剂良好的反应稳定性源于其优异的抗碳酸盐累积能力.
关键词:
金
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氧化铁
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羟基磷灰石
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一氧化碳
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抗烧结
田涛
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刘英
,
张勋高
催化学报
doi:10.1016/S1872-2067(15)60854-3
采用均匀沉积-沉淀法制备了氧化铜修饰羟基磷灰石负载金催化剂(Au/CuO-HAP),并用原子吸收光谱、N2吸附脱附、X射线粉末衍射、透射电镜和X射线光电子能谱等方法对催化剂结构和形貌进行了表征.考察了催化剂对醇类液相需氧氧化的催化性能.与单金属Au/HAP或CuO-HAP相比较,双金属Au/CuO-HAP对苯甲醇氧化的催化活性和苯甲醛的选择性有显著提高,120 oC反应1.5 h,苯甲醇的转化率和苯甲醛的选择性分别达到99.7%和98.4%.在Au/CuO-HAP的催化下,其它类型的芳香醇均可高选择性转化为相应的醛或酮. Au/CuO-HAP催化剂有很好的稳定性和可回收性,4次回收后,其催化活性没有明显变化.
关键词:
多相催化
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金-铜双金属催化剂
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醇类的需氧氧化
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羟基磷灰石
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重复使用性
曹宁
,
白允强
,
马泉生
,
隋金玲
,
李木森
新型炭材料
采用等离子体喷涂法在炭/炭复合材料基体上制备了羟基磷灰石涂层,并对所制材料开展体外模拟和试验.结果表明:在体外模拟生理环境的Ringer溶液中,涂层组成相随浸泡时间发生变化.涂层表面有新生羟基磷灰石结晶析出并聚集长大.骨内种植试验期间,动物末出现排异和炎症反应,涂层与基体结合良好.组织学观察发现,涂层与骨界面处有明显的组织改建和新骨形成形态.炭/炭复合材料表面等离子体喷涂羟基磷灰石涂层作为一种潜在的骨组织修复材料具有良好的应用前景.
关键词:
羟基磷灰石
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炭/炭复合材料
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体外模拟
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生物学性能
