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1、第30卷第2期矿冶工程Vo.l30#22010年04月MININGANDMETALLURGICALENGINEERINGApril2010形貌控制合成纤维状氧化亚镍粉末新型前驱体湛菁,邬建辉,张传福,岳建峰(中南大学冶金科学与工程学院,湖南长沙410083)摘要:以可溶性镍盐和草酸或草酸铵为原料,利用氨为配位剂,通过配位沉淀法制备了纤维状氧化亚镍粉新型前驱体,并采用XRD、红外光谱(IR)和扫描电镜(SEM)研究了前驱体粉末的物相、成分与形貌,系统考察配位沉淀条件包括溶液pH值、反应温度、2-+反应物浓度和表面活性剂对前驱体粉末形貌、粒度和
2、成分的影响。结果表明:Ni()C2O4NH3NH4H2O反应体系中,在溶液2+pH值为8.2~8.8,温度为60~70!,Ni浓度为0.5~0.8mol/L,表面活性剂聚乙烯吡咯烷酮(PVP)用量为0.1%~0.5%条件下得到的新型前驱体为草酸镍氨复盐,其形貌为纤维状;氨与镍离子配合并生成草酸镍氨复盐是纤维状形貌形成的内在机制。通过2在空气中热分解该种前驱体即可得到比表面积为5.944m/g、轴径比大于50的纤维状氧化亚镍粉末。关键词:草酸镍氨复盐粉末;氧化亚镍粉;纤维状;生长机理中图分类号:O614.8文献标识码:A文章编号:0253-609
3、9(2010)02-0064-06ShapecontrolledSynthesisofNovelPrecursorforPreparingFiberlikeNickelOxidePowdersZHANJing,WUJianhu,iZHANGChuanfu,YUEJianfeng(SchoolofMetallurgyScienceandEngineering,CentralSouthUniversity,Changsha410083,Hunan,China)Abstract:Anovelprecursorforfiberlikenickelo
4、xidepowdershasbeensynthesizedbycoordinationprecipitationprocessusingNiCl2∀6H2Oandoxalateorammoniaoxalateasstartingmaterialsandammoniaascomplexingagen.tThephase,compositionandmorphologyofthenovelprecursorwereanalyzedbyXRD,IRandSEM.Theinfluencesofvariouscoordinationprecipitation
5、conditionsincludingpHvalue,precipitationtemperature,reactantconcentrationandsurfactantadditiononthemorphology,compositionandsizeoftheprecursorparticleswereinvestigatedindetai.lThere2-+sultsshowedthattheprecursorsobtainedinthereactionsystemofNi()C2O4NH3NH4H2Ounderthecondi2+
6、tionssuchaspHvalueof8.2~8.8,Niconcentrationof0.5~0.8mol/L,coordinationprecipitationtemperatureof60~75!andsurfactantPVPdosageof0.1%~0.5%wasnickeloxalateammoniacomplexsal,twhichhasafiberlikemorphology.Thecoordinationofammoniawithnickelionsresultedinnickeloxalateammoniacomplexs
7、al,twhichtellstheintrinsicmechanismoftheformationoffiberlikemorphology.ThefiberlikeNiOpowderswithaxis/diameter2ratiomorethan50andspecificsurfaceareaof5.944m/gcanbeproducedbythermaldecompositionofthenovelprecursorinair.Keywords:nickeloxalateammoniacomplexsal;tNiOpowder;fiberl
8、ike;growthmechanism[7]氧化亚镍作为一种非常重要的无机功能材料,已制备
