Building Reversible Nano-raspberries - Eren et al. - Unknown - Unknown

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1、SupplementaryInformationfor:BuildingReversibleNano-raspberriesE.DenizEren1,Mohammad-AminMoradi1,HeinerFriedrich1,2andGijsbertusdeWith11LaboratoryofPhysicalChemistry,DepartmentofChemicalEngineeringandChemistry,EindhovenUniversityofTechnology,Eindhoven

2、,TheNetherlands2InstituteforComplexMolecularSystems,EindhovenUniversityofTechnology,Eindhoven,TheNetherlandsCorrespondenceto:G.deWith(G.deWith@tue.nl;orcid.org/0000-0002-7163-8429)MaterialsandMethodsSynthesisofsilicananoparticles100mgL-lysine(Fluka)w

3、asdissolvedin100mlpurewaterina250mlthree-neckflaskbymagneticallystirring(270rpm)at60°C.Thereafter,theformationoftheSiO2NPswasinitiatedbyadding6mltetraethylorthosilicate(TEOS)tothereactionsolutionandthereactionvesselwasclosedoffbyarubberseptumwithasma

4、llneedleinsertedasavent.Thereactionwasleftmeanwhilestirringfor1day.SurfacemodificationofsilicananoparticlesSilicananoparticlesneedtobesurfacemodifiedtoprovidethemwiththeproperchargedensityandasaresult,havingacontrollableinteractionforbuildingblockass

5、emblyforthefollowingstep.Tomodifythesurfaceofsilicananoparticles,1wt%(3-Aminopropyl)triethoxysilane(APTES)(Sigma-Aldrich)solutioninwater(pH∼11)wasslowlyaddedtotheas-preparedsilicasuspensionwhilestirringvigorously(~700rpm).TheinitialamountofAPTESandco

6、lloidalsilicausedhadasilane:silicaweightratioof1:50,abovewhichtheparticlesrapidlycoagulated.Thesilane-silicamixturewasthenwashedbyrepeatedcentrifugationandreplacementofthesupernatantforatleastfivetimes.Sizemeasurementsofsilicaandpolystyrenelatexnanop

7、articlesSizedistributionsweredeterminedbymanuallymeasuringtheshortandlongaxesofindividualsilicananoparticles(SiO2NPs)incryoTEMimagesusinganin-housemadeMATLABscript.TheaverageradiusofaSiO2NPwastakentobeaquarterofthesumofthelongandshortaxesoftheSiO2NPa

8、ndthesizeisreportedas:mean±standarddeviationofthemean(262SiO2NPswereusedtocalculatethesizedistributionandthesizewasfoundtobe28.8±0.4nm).TheresultscanbeseeninFigureSI1.FigureSI1.ThesizedistributionoftheSiO2NPsdeterminedfroma-b)cryoTEMimagesusinganin-h