Directed self-assembly of spherical caps via confinement

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1、SoftMatterViewArticleOnlinePAPERViewJournal

2、ViewIssueDirectedself-assemblyofsphericalcapsviaconfinementabcaCarlosAvendano,~ChekeshaM.LiddellWatsonandFernandoA.Escobedo*Citethis:SoftMatter,2013,9,9153InthisworkweuseMonteCarlosimulationstostudythephasebehaviorofsphericalcapsconfinedbetwe

3、entwoparallelhardwallsseparatedbyadistanceH.Theparticlemodelconsistsofahardsphereofdiameterscutoffbyaplaneataheightc,anditislooselybasedonmushroomcap-shapedparticleswhosephasebehaviorwasrecentlystudiedexperimentally[E.K.RileyandC.M.Liddell,Langmuir,26,2010,11648].Thegeometryoftheparti

4、clesischaracterizedbythereducedheightc*¼c/s,suchthatthemodelextrapolatesbetweenhardspheresforc*/1andinfinitelythinhardsphericalcapsforc*/0.Three3differentparticleshapesareinvestigated:(a)three-quarterheightsphericalcaps(c*¼/4),(b)one-halfheightsphericalcapsorhemispheres(c*¼½),and(c)one

5、-quarterheightsphericalcaps(c*¼¼).Thesethreemodelsareusedtorationalizetheeffectofparticleshapeontheentropy-drivenself-assemblyoftheparticlesunderstrongconfinements;i.e.,for1

6、esobservedinconfinedhardspheresonaccountoftheremainingsphericalsurfaceintheparticles,butwithadditionalfeaturesonaccountoftheparticleshapeshavingintrinsicanisotropyandorientationaldegreesof3freedom.Thec*¼/4systemisfoundtoexhibitaphasediagramthatismostsimilartotheoneobtainedReceived23rd

7、March2013experimentallyfortheconfinedmushroomcap-shapedcolloidalparticlesunderconfinement;however,Accepted23rdApril2013simulationsalsorevealsixotherphasesthatoccuronapproachingtheclose-packingconditionsforaDOI:10.1039/c3sm50833agivenH.Aqualitativeglobalphasediagramisconstructedthathelp

8、srevealtheinterrelationsamongwww.rsc.org/softmatterdifferentphasesforalltheparticleshapesandconfinementsstudied.IIntroductionmaterialswithspecicpropertiesbytailoringtheindividualparticles.Materialsthatareabletocontrolandmodifylightpropaga-Severalexamplesofcrystalsformedbytheself-assem

9、blyof1Publis