简介:Thechemicalgraftingofthiolterminatedpoly(sodiumstyrenesulfonate)(HS-PSSS)chainsfromsodiumnitrate(NaNO3)saltsolutiontoagoldsurfacewasinvestigatedwithaquartzcrystalmicrobalancewithdissipationmonitoring(QCM-D)indifferentsaltconcentrations.ItwasfoundthatatlowsaltconcentrationgraftingdensityofHS-PSSSwaslowandthegraftedchainsadoptedamushroomconformation.Withtheincreaseofsaltconcentrationpolyelectrolytechainsunderwentatransitiontowardcoiledstateduetoreductionofelectrostaticrepulsionandasaresultmorechainsweregraftedonthesurface.WhenthegraftingdensityreachedacertainlimitafterwhichfurthergraftingcausedrepulsionbetweenalreadygraftedHS-PSSSchainsandasaresultgraftedchainsadoptedabrushconformation.
简介:Theadsorptionofnano-particlesonbubblesurfaceisdiscussedforsaturatedboilingonthinwireofnano-particlesuspensions.Owingtothedecreaseofsurfacetensionforsuspensions,thenano-particlestendtoadsorbonthebubblesurfacetodecreasetheGibbsfreeenergyforstability,andmeanwhilethevelocityofnano-particleswouldbesmallerthanthatofbubblegrowth.Thelong-rangevanderWaalsforceexistingbetween'waterparticles'andnano-particlesisconsideredtheattractiveforcebetweenthenano-particlesandthebubblesurface.Thus,thenano-particleswouldattachonthebubblesurfaceiftheparticle-surfacedistanceissmallerthanitscriticalvalue.Thedistributionofnano-particlesonthebubblesurfaceandintheadjacentregionisalsoinvestigated.
简介:StrataofdifferentgeologicalperiodsextensivelyoutcropinwesternGuang-dongProvince,butmostgolddepositsarerestrictedtotheMiddle-LateProterozoicYunkaiGroupandtheCambrianBacunGroup,showingobviousstrata-bouncharacter-istics.GoldabundanceandtraceelementgeochemistryoftheYunkaiandBacunGroupsarecomparedwiththoseoftheOrdovicianandSilurianstrta.TheYunkaiGroupisconsideredtobethesourcestrataforgoldmineralizationintheregion.
简介:CalculationsbasedontheavailablethermodynamicdataofAuCl2^-andAu(HS)2^-indicatethatAuCl2^-isresponsibleforthetransportandenrichmentofgoldduringthestageofpre-concentrationinthesourcebedwhileAu(HS)2^-isthemaingoldspeciesinvolvedintheformationofgolddepositsinresponsetohydrothermalreworking.Acidchloridesolutionswithαcl^->10°andsulfur-richsolutionswitha∑sinexcessof10^-2areheldasimportantcriteriaforgoldenrichmentinthesourcebedandfortheformationofgolddepositsbysubsequenthydrothermalevent,respectively.
简介:在用黄金和银做的塑造的nanoparticles的合成的进展在这篇文章被考察。这评论由分析在nanoparticle形状和它的内部水晶的结构的几何对称之间的关系以一个新角度开始。根据关系,有明确的形状的nanoparticles被分类进三个范畴:有单个crystallinity,有尖双胞胎的nanoparticles,和有平行双胞胎的nanoparticles的nanoparticles。为在每个范畴的塑造的nanoparticles的合成的古典方法的讨论和分析也被包括,在塑造的金属nanoparticles的合成的未来研究方向上的个人观点简短被总结。这评论被期望在为塑造的nanoparticles的合成设计策略并且分析相应生长机制提供一个指南。
简介:SubordinatedtotheMinistryofMetallurgicalIndustrytheChinaNationalGoldCorporationistheonlystate-runnationalgroupcorporationinChina.Itisauthorizedtoperformitsobligationsinthecontrolandoperationofthestateownedassetsofitssubordinatedenterprisesandundertakinginstitutions.Anditisalsoresponsibleforworkingoutandimplementingthelong-termprogrammesandyearlyplansofthoseenterprisesandofficesdirectlyaffiliatedtothecorporationandfortheinvestmentandbuildupoftheentiregoldindustryinChina.Ithastheautonomytodevelopinternationaleconomicandtechnicalexchangeandcooperationwithitsforeigncounterpartsandtoconductimportandexportbusinessofthematerials,equipmentandtechnologiesforuseintheindustry.