简介:Thepreparationofcalciumphosphate(CP)coatingonaluminaceramicsusingelectricpulsestimulatingmethodhasbeeninvestigated.Thecup-shapedaluminaceramicsweresoakedinasimulatedbodyfluid(SBF),andasquarepulsepotentialwithfrequencyof1Hzandvoltageof110Vwasappliedbetweentheinnerandoutersurfacesofthealuminacup.SurfacemorphologyofCPcoatingsduringdifferentdepositionperiodswasobservedbyaPhilipsXL-30scanningelectronmicroscope(SEM).CompositionalanalysiswasexaminedbyEDAX.ThemechanismofnucleationandgrowthofCPcoatingwasdiscussed.SEMresultindicatesthatthecoatingcomprisesofalargenumberoftinyneedle-likegrainsandhasaporousmicrostructure.ThereisastrongbondbetweenthedepositedlayerandAl2O3substrate,whichmaybeduetothegentlegrowthofthebiomimeticmethod.TheEDAXanalysisindicatesthatmaincompositionofthecoatingiscalciumandphosphor.TheformationofCPcoatingmaybecontributedtothestimulationofelectricpulseandthehighionsconcentrationwhichis1.5timesoftheconcentrationofSBFsolution(1.5SBFsolution).SuchsurfacefunctionalizationmethodbyelectricpulsepotentialcanbeusedtoprepareCPcoatingonvariouselectric-insulatingbioinertmaterialsforimprovingtheirbioactivecharacter.
简介:基于对域外P2P行业监管的梳理和分析,结合我国P2P小额信贷中介服务机构所兼具的创新性金融服务机构、投资咨询类中介服务机构和电子商务金融创新服务平台的三重性质,我国应当尽快完善并不断发展P2P小额信贷中介服务行业的法律制度体系建设,践行多方推动、统筹兼顾、虚实结合、着力创新、注重实效、规范发展、保障安全的新型监管理念并将政府主导型监管制度和市场需求引致型监管制度演变相结合,从而建立起由中国人民银行主导监管、银监会在相应业务领域紧密配合、地方政府严格实施、工商行政管理机关和工信部门积极参与的P2P行业监管框架.
简介:通过溶液法培养了3-氨基-2-羧基吡嗪的单晶,利用单晶X-射线衍射法测定了其晶体结构。同时利用元素分析、红外光谱对其进行了表征。晶体学数据:单斜晶系,P2(1)/c空间群,a=3.7629(7)Ao,b=14.2098(3)Ao,c=10.9212(19)A°^,α=90°,β=99.182(3)°,γ=90°,V=576.47(18)A°^3,Z=4,ρcalc=1.603g·cm^-3,R1=0.0527,WR2=0.1368。结构分析表明,3-氨基-2-羧基吡嗪分子通过氢键作用和π-π堆积作用连接成三维超分子网络结构。