Engstrand Unosson Johanna, Persson Cecilia, Engqvist Håkan
Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden.
J Biomed Mater Res B Appl Biomater. 2015 Jan;103(1):62-71. doi: 10.1002/jbm.b.33173. Epub 2014 Apr 25.
The porosity of a material can be determined using a diversity of methods; however, the results from these methods have so far not been compared and analyzed for calcium phosphate cements (CPCs). The aim of this study was to compare a fast and easy method for porosity measurements with some commonly used porosity methods for CPCs. The investigated method is based on the assumption that when a wet cement sample is dried, the volume of the evaporated water is equal to the volume of pores within the cement. Moreover, different methods of drying the cements were evaluated for acidic CPCs. The results showed that drying at room temperature (22 ± 1°C) is preferable, since a phase transformation was observed at higher temperatures. The results also showed that drying for 24 h in vacuum was sufficient to achieve water-free cements. The porosity measured was found to vary between the porosity methods evaluated herein, and to get a complete picture of a cement's porosity more than one method is recommended. Water evaporation, is, however, a fast and easy method to estimate the porosity of CPCs and could simplify porosity measurements in the future.
材料的孔隙率可以用多种方法测定；然而，到目前为止，尚未对磷酸钙骨水泥（CPC）的这些方法的结果进行比较和分析。本研究的目的是将一种快速简便的孔隙率测量方法与一些常用的CPC孔隙率方法进行比较。所研究的方法基于这样一种假设，即当湿水泥样品干燥时，蒸发水的体积等于水泥内部孔隙的体积。此外，还对酸性CPC的不同干燥方法进行了评估。结果表明，室温（22±1°C）干燥较为适宜，因为在较高温度下观察到了相变。结果还表明，在真空中干燥24小时足以得到无水水泥。在所评估的孔隙率方法中，测得的孔隙率有所不同，建议采用多种方法以全面了解水泥的孔隙率。然而，水蒸发是一种快速简便的估算CPC孔隙率的方法，未来可能会简化孔隙率测量。
