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摘要： The presented thesis theoretically describes methods applied for the characterization of organic substances presented on the surfaces of advanced ceramic *** of contact angles experimentally verifies the changes on surfaces of advanced ceramics. These changes are caused by the contamination of the surface. Adsorption of organic compounds on inorganic surfaces is rather unfavorable,  therefore obtained results may provide useful information about the mechanisms of removal of the contaminants from *** the experimental part, water contact angle measurements were used to monitor and describe the changes of surface characteristics of ceramic oxides ZnO, TiO2, hydroxyapatite, Al2O3 and ZrO2. WCAs for untreated surfaces along with the WCA values for thermally or chemically treated surfaces of studied materials were assessed and compared in order to describe  changes  in surface energy, hydrophilicity and adhesivity caused by adsorbed organic adlayer. The decrease of contact angle values was achieved by cleaning of the surface with subsequent deprivation of adsorbed molecules.

关键词： 骨缺损   全氟化合物   1-溴十七氟辛烷   温控型骨组织工程材料   骨移植   家兔  

摘要： 目的构建一种富氧温控型骨组织工程材料并对其性能进行评价。方法本实验制备出含5%和10%1-溴十七氟辛烷的温控型骨组织工程材料,检测2种材料的凝固时间、pH值、释氧曲线,并通过筛选较优1-溴十七氟辛烷浓度的材料,检测该材料的微观结构、毒性及生物相容性。结果2种1-溴十七氟辛烷浓度的材料均可在37℃条件下凝固成胶,时间为4.5 min。2种材料的凝固时间和pH值比较差异无统计学意义(P>0.05)。2种材料浸提液中的氧分压均呈上升趋势,并在7 d时达到峰值,10 d内均可持续释放氧气,但1-溴十七氟辛烷浓度为10%的材料的释氧效能更高(P<0.01)。1-溴十七氟辛烷浓度为10%的温控型骨组织工程材料呈三维立体网状结构,孔隙率较高,且无细胞毒性,生物相容性良好,在体内可被完全降解。结论1-溴十七氟辛烷浓度为10%的温控型骨组织工程材料具有良好的释氧性能、良好的生物相容性和可降解性,可作为改善移植后早期低氧环境的缓释骨移植替代物。

关键词： 汽车车身   机械工程   材料选用   成型技术  

摘要： 随着汽车的逐步普及,汽车的使用也带来了许多负面效应,例如燃油消耗、报废汽车处理等问题.因此,在汽车设计和制造方面进行革新,是一种行之有效的方法,特别是引入轻量化技术,既可以减少环境污染,又可以提高汽车的安全性和环保性,为今后的汽车发展指明了方向.因此,分析汽车的轻质材料和生产技术是非常有意义的.