简介：Silicaaggregateswerepreparedbybase-catalyzedhydrolysisandcondensationofalkoxidesinalcohol.Polyethyleneglycol(PEG)wasusedasorganicmodifier.ThesolswerecharacterizedusingSmallAngleX-rayScattering(SAXS)withsynchrotronradiationasX-raysource.Thestructureevolutionduringthesol-gelprocesswasdeterminedanddescribedintermsofthefractalgeometry.As-producedsilicaaggregateswerefoundtobemassfractals.Thefractldimensionsspannedtheregime2.1-2.6correspondingtomorebranchedandcompactstructures.BothRLCAandEdenmodelsdominatedthekineticgrowthunderbase-catalyzedcondition.

简介：SmallX-rayScattering(SAXS)experimentusingSynchrotronRadiationasX-raysourcewasusedtodeterminetheaveragewallthicknessofmesoporoussilicaprepardbycondensationoftetraethylorthosilicate(TEOS)usingnon-ionicalkylpolyethyleneoxide(AEO9)surfactantastemplates.Theresultsagreedwiththatofhigh-resolutionTEM(HRTEM)measurement.

简介：Asmall-anglex-rayscattering(SAXS)techniqueusingsynchrotronradiationasthex-raysourcehasbeenemployedtocharacterizethemicrostructureofmesoporoussilicapreparedbyone-pottemplate-directedsynthesismethodology.ThescatteringofpuresilicaagreedwithPorod’slaw.thescatteringoforganomodifiedmesoporoussilicashowedanegativedeviationfromPorod’slaw,suggestingthataninterfaciallayerexistsbetweentheporesandsilicamatrix.Itwastheorganicgroupscomprisingtheinterface,asshownby^29Sicross-polarizationmagic-anglespinningnuclearmagneticresonanceimaging(^29SicpMAS/NMR)andFouriertransforminfraredspectroscopy(FTIR),thatcausedthisnegativedeviationofSAXSintensityfromPorod’slaw,andtheaveragethichnessoftheinterfaciallayercouldbededucedfromthisnegativedeviation.Copyright2001johnWileyandSons,Ltd.

简介：Poly(bis(phenoxy)phosphazene)(SPBPP)/phosphotungsticacid(PWA)/silicacompositemembranesforfuelcellswereprepared.ThecompositemembraneswerecharacterizedbyusingFTIR,TGAandSEMtechniquies.IncorporationofPWAparticlesandsilicaparticlesintotheSPBPPpolymermatrixandaspecificinteractionbetweenthemwereconfirmedbyFTIRspectra.TGAresultsshowedthatthecompositemembraneshadhighthermalstability.HomogeneousdistributionofPWAandsilicaparticleswithintheSPBPPmatrixwasverifiedbySEMmicrographs.Thedopedmembranesshowedincreasedwateruptakeandprotonconductivity.

简介：皮克林乳剂作为emulsifiers用硅石和方解石的混合粒子被准备。在稳定性和皮克林乳剂的落下尺寸上的混合粒子的硅石内容的效果被调查。结果证明皮克林乳剂具有oil-in-water类型。与在混合粒子增加硅石内容，稳定性和皮克林乳剂的落下尺寸减少了。更大的硅石粒子在乳剂的稳定性上有更多的影响，当更小的在乳剂的落下尺寸上有更多的影响时。乳剂上的硅石粒子的效果在皮克林乳剂的oilwater接口被归因于他们的吸附的行为。

简介：Coreshell硅石nanoparticles在修改弄湿行为的表面是优异的，提高在结晶化的成核和生长，改进裸体nanoparticles的分散，并且因此升级器官的聚合物的全面性质。在包括聚酯的几聚合物的monodispersecoreshell硅石粒子的分散行为和形态学被考察，他们的潜在的应用程序被讨论。

简介：

简介：Anefficientmethodtomountacoupledsilicamicrosphereandtaperedfibersystemisproposedanddemonstratedexperimentally.Forthepurposeofoptomechanicalstudies,high-quality-factoroptical(Q_o～10~8)andmechanicalmodes(Q_m～0.87×10~4)aremaintainedafterthemountingprocess.Forthemountedmicrosphere,thecouplingsystemismorestableandcompactand,thus,isbeneficialforfuturestudiesandapplicationsbasedonoptomechanicalinteractions.Especially,thepackagedoptomechanicalsystem,whichistestedinavacuumchamber,pavesthewaytowardquantumoptomechanicsresearchincryostat.

简介：SmallangleX-rayscatteringexperimentshavebeenperformedtostudythemicrostructureofmessoporoussilicameterialspreparedbycondensationoftetraethylorthosilicateusingnonionicalkylpolyethyleneoxide(AEO9)andioniccetyltrimethylammoniumbromide(CTAB)surfactantastemplates.Itistheporeswithinthenanometrerangethatproducethemaincattering.ThescatteringofthepuresilicasystemsobeyPorod’slaw.Thismaybebecausethetemplatesproducesomeadditionalscatteringbackgroundandthenmakethescatteringofporesdistorted.TheresultsshowthatthefullremovaloftemplatesfromtheporesofthematerialsbySoxhletextractionisveryeasyforAEO9,butitisdifficultforCTAB.Thepositivedeviationcorrectionisalsoperfromed.

简介：Polyacrylamide/silica（PAM/SiO2）compositecapsulesweresynthesizedbyinversePickeringemulsionpolymerization.Silicananoparticlesmodifiedwithmethacryloxypropyltrimethoxysilane（MPS）wereusedasastabilizer.Transmissionelectronmicroscopy（TEM）,scanningelectronmicroscopy（SEM）,Fouriertransforminfrared（FT1R）spectroscopy,andthermalgravimetricanalysis（TGA）wereusedtocharacterizethemorphologyandcompositionofthecompositecapsules.SEMandTEMimagesshowedthatcapsulesconsistedofaparticleshellandapolymerinnerlayer.Thecapsulesizedependsonthenanoparticleconcentrationinthecontinuousphase.Thecompositerigiditylargelydependsontheacrylamideconcentration.FTIRandTGAresultsindicatedtheexistenceofpolyacrylamideandSiO2inthecompositeparticles.AqueousHg（Ⅱ）removaltestingbythePAM/SiO2compositecapsulesindicatedpromisingpotentialforremovingheavymetalionsfromwastewater.

简介：

简介：Silica-bound15-Crown-5,18-Crown-6withaspacerofpropyloxymethylandtheirplatinumcomplexeshavebeensynthesized.Itwasfoundthattheywereefficientcatalystsforthehydrosilylationofolefmswithtriethoxysilaneinthetemperaturerangeof60to130℃.

简介：

简介：Thepresentpaperrepresentsthesynthesesofpolypropyloxymethyldithia15-crown-5and18-crown-6supportedonsilicaandtheirplatinumcomplexes.Theplatinumcomplexesareeffectivecatalystsforthehydrosilylationofolefinswithtriethoxysilane.Theinfluencesoftemperature,amountofplatinumcomplexesusedandthenatureofolefinsusedonthecatalyticactivityofthecomplexesarealsoinvestigatedinthispaper.

简介：

简介：Polymethylmethacrylate(PMMA)包含了硅石nanocomposite粒子被准备由超声地在硅石大音阶的第五音的表面上在situ导致了甲基methacrylate(MMA)的聚合。nanoparticles被Fourier变换描绘红外线的光谱学(FTIR)，传播电子显微镜学(TEM)，thermogravimetry(TG)，扫描电子显微镜学(SEM)。结果证明有36nm的一种平均尺寸的coreshell结构nanocomposite粒子被获得，并且包含层的聚合物的厚度是大约8nm。有tert丁基hydroperoxide(TBHP)和增加的硅石大音阶的第五音的预告的处理?-methacryloxypropyltrimethoxysilane(MAPTS)显著地提高了封装效果。由聚合物层修改了，硅石粒子能很好在矩阵被驱散并且利用了改进polyacrylates的机械表演。

简介：由支持硅石的钠氢硫酸盐的本甲基酉旨的新debenzylation被描述。debenzylation能有选择地并且高效地被完成在对没有影响象nitro，不饱和的契约，和乙醇酉旨那样的敏感的功能的组的优秀收益好。

简介：Inthispaper,amultidimensionaltuningmethodofthesilicamicrocapillaryresonator(MCR)isproposedanddemonstratedwherebytheextinctionratio(ER)aswellastheresonantwavelengthcanbeindividuallycontrolled.AnERtuningrangeofupto17dBandamaximumtuningsensitivityof0.3dB/μmarerealizedduetothetaperedprofileofthesilicaopticalmicrofiber(MF)whentheMFisadjustedalongitsaxialdirection.Comparedtodirecttuningofthecouplinggap,thismethodcouldlowertherequirementfortheresolutionofdisplacementstagetomicrometers.WhentheMFisadjustedalongtheaxialdirectionofthesilicamicrocapillary,aresonanceshiftof3.06nmandmaximumtuningsensitivityof0.01nm/μmareachieved.Thismethodavoidstheuseofanappliedexternalfieldtocontrolthesilicamicroresonators.Moreover,whenairisreplacedbyethanolandwaterinthecoreofthesilicamicrocapillary,amaximumresonanceshiftof5.22nmisalsoachievedtofurtherenlargetheresonancetuningrange.Finally,amicrobubbleresonatorwithahigherQfactorisalsofabricatedtoachieveanERtuningrangeof8.5dB.OurmethodfullytakesadvantageoftheuniquestructureoftheMCRtoseparatelyandeasilytuneitskeyparameters,andmaybroadenitsapplicationsinopticalsignalprocessingandsensing.

简介：Thecompositeofα-ZrPandfumedsilicawaspreparedbydispersingpredeterminedmolarratiosofpolycrystallineα-ZrPinwater.Admittancemeasurementofthesampleswasmadeinthefrequencerangefrom5Hzto1MHzandthetemperaturerangefrom-20℃to20℃.Theactivationenergyinconductionofthecomposites,withdifferentmolarfractionofα-ZrP,isabout5.9KJ/molat60%and40%relativehumidities.Theresultsshowthatthechargetransportmechanismwasnotchangedaftermixingfumedsilicaintoα-ZrPandthechargetransportmediumiswaterinα-ZrPandthecomposites.

简介：Acidicionicliquid([BsAIm][OTf])wasimmobilizedonsulfhydryl-group-modifiedSiO2(MPS-SiO2)viafreeradicaladditionreaction.The[BsAIm][OTf]loadingonacidicionicliquid-functionalizedsilica([BsAIm][OTf]/SiO2)wascontrolledthroughtuningthesulfydryl(SH)contentofMPS-SiO2.AllthesampleswerecharacterizedbyFT-IR,elementalanalysis,N2adsorption-desorptionmeasurementsandTGDTA.Thecatalyticperformanceof[BsAIm][OTf]/SiO2intheesterificationofoleicacidandthetransesterificationofglyceroltrioleateforbiodieselproductionwasinvestigated.Theresultsshowedthatwiththeincreaseof[BsAIm][OTf]loadingonSiO2thespecificsurfaceareaandporevolumeof[BsAIm][OTf]/SiO2decreased,andtheporediameterof[BsAIm][OTf]/SiO2narrowed.Intheesterificaitonofoleicacid,theoleicacidconversionincreasedwiththeincreasing[BsAIm][OTf]loading.Inthetransesterificationofglyceroltrioleate,withtheincreasing[BsAIm][OTf]loadingtheglyceroltrioleateconversiondecreasedandtheselectivitiestoglycerolmonooleateandmethyloleateincreased.