多孔β-TCP陶瓷的制备及其性能研究

开发了一个制备多孔β -TCP陶瓷的新工艺 ,从HAP出发 ,通过加入一定比例的低钙磷比生物玻璃作为反应物和增强剂 ,使HAP在高温下反应生成β -TCP。该工艺一反传统由β-TCP粉末为原料制备块体多孔材料的方法 ,不仅解决了湿法制备 β -TCP粉末时冗长的陈化时间、pH值的调定、固液相难分离等过程 ,而且由HAP向 β

Effect of Marangoni Convection on Mass Transfer in Liquid Phase

Marangoni convection and its influence on the mass transter in the liquid phase were investigated. Marangoni convection was visualized using laser Schlieren technique, Orderly polygonal convection patterns and random interfacial turbulence were observed. The effect of Marangoni convection on the mass transfer rate was studied by desorbing ethanol from aqneous solution in the falling film. The experimental results show that Marangoni convection can speed up the surface real and enhance the mass transfer rate in the liquid phase.The liquid mass transfer coefficient can be enhanced by as much as 3 folds. The corresponding empirical correlations are given in terms of the mass transfer enhancement factor. Furthermore, in considering the Marangoni effect, the conventional mass transfer correlation was modified, The differences between the values predicted by the correlation and the experimental data are within ±8.2% and the average difference is 4.2%.

QuEChERS-UPLC-MRM-IDA-EPI法测定巴比妥类药物的临床监测

目的 :建立检测生物样本(全血、尿液、唾液)中所含巴比妥、苯巴比妥、异戊巴比妥药物成分的QuEChERS-超高效液相色谱(UPLC)-多重反应监测(MRM)-条件触发(IDA Criteria)-增强子离子扫描(EPI)检测方法。方法 :色谱柱为Waters Atlantis T3 C_(18),100 mm×2.1 mm,3μm;柱温为40℃;流动相为含0.1%甲酸的5 mmol/L甲酸铵水溶液及乙腈,梯度洗脱15 min;流速为0.2 mL/min;以优化后的质谱参数采集信号。结果 :检出限浓度为0.5 ng/mL;定量限浓度为1.0 ng/mL;线性范围为定量限浓度～200 ng/mL;在线性范围内相关系数在0.999以上;加标回收率为88.0%～96.8%。结论 :本方法准确,灵敏度高,专属性好;能用于生物样本(全血、尿液、唾液)中巴比妥、苯巴比妥、异戊巴比妥化学成分的同时定性及定量检测。