简介:纤维素醚广泛地习惯于臼明确的表达,并且理解在纤维素醚和水泥粘贴之间的相互作用是重要的。英尺红外系列,热分析和SEM被用来在HEMC和HPMC在这篇文章修改的水泥粘贴调查水和产品。结果证明在修改水泥粘贴的水和产品与在未修改的水泥浆糊,而是主要水和产品的那些是最后相同的,例如CH(氢氧化钙),ettringite和C-S-H,比的在修改水泥粘贴显得以后在未修改的水泥浆糊。纤维素醚减少外部产品和增加C-S-H胶化的内部产品。比作未修改的水泥粘贴,没有新产品在现在的实验在修改水泥粘贴被发现。HEMC和HPMC调查几乎在波特兰水泥的水和产品上显示出一样的影响。
简介:Zincwasrecentlysuggestedtobeapotentialcandidatematerialfordegradablecoronaryarterystent.Thecorrosionbehaviorofpurezincexposedtor-SBFupto336hwasinvestigatedbyelectrochemicalmeasurementsandimmersiontests.Themorphologyandchemicalcompositesofthecorrosionproductswereinvestigatedbyscanningelectronmicroscope,grazing-incidenceX-raydiffraction,X-rayphotoelectronspectroscopyandFouriertransforminfraredspectrometer.Theresultsdemonstratethattheinitialcorrosionproductsonthepurezincmainlyconsistofzincoxide/hydroxideandzinc/calciumphosphatecompounds.ThepureZnencountersuniformcorrosionwithanestimatedcorrosionrateof0.02-0.07mmy^-1duringtheimmersion,whichsuggeststhesuitabilityofpureZnforbiomedicalapplications.
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