000911210 001__ 911210
000911210 005__ 20221116131015.0
000911210 037__ $$aFZJ-2022-04515
000911210 041__ $$aEnglish
000911210 1001_ $$0P:(DE-Juel1)130749$$aKang, Kyongok$$b0$$eCorresponding author
000911210 1112_ $$aInvited Seminar Talk, SNU, South Korea$$wSouth Korea
000911210 245__ $$aOrientational Glasses and Phase Behavior of Charged DNA-Rods and their Response to Shear Flow$$f2022-04-18 - 
000911210 260__ $$c2022
000911210 3367_ $$033$$2EndNote$$aConference Paper
000911210 3367_ $$2DataCite$$aOther
000911210 3367_ $$2BibTeX$$aINPROCEEDINGS
000911210 3367_ $$2ORCID$$aLECTURE_SPEECH
000911210 3367_ $$0PUB:(DE-HGF)31$$2PUB:(DE-HGF)$$aTalk (non-conference)$$btalk$$mtalk$$s1668514915_2645$$xInvited
000911210 3367_ $$2DINI$$aOther
000911210 520__ $$aLong and thin, highly charged colloidal rods (fd-virus particles) exhibit a glass transition at a concentration for low ionic strengths, far above the isotropic-nematic coexistence region. The morphology of the system consists of chiral-nematic mesophases with different orientations. The dynamics of single particles within the domains is arrested due to initial caging of the charged rods by their neighbors through long-ranged electrostatic interactions. The microscopic dynamics of the orientation texture in domains is found to freeze at the same concentration where single particles are dynamically arrested [1,2]. Below the glass-transition concentration, the initial morphology with large shear-aligned domains breaks up into smaller domains, and equilibrates after typically 50–100 hours. Two dynamical modes are observed below the glass transition upon equilibration. On approach of the glass-transition concentration, the slow dynamical mode increases in amplitude, while the amplitudes of a fast and slow modes become equal at the glass transition [3-6]. In the first part of this talk I will present experimental results on the glass transition, the dynamics below the glass-transition, and the phase diagram in the fd-concentration versus ionic strength.The second part of the talk will be devoted to the flow behavior of fd-suspensions in the glassy state. Such suspensions exhibit stable inhomogeneous flow profiles, depending on the applied shear rate: fracture and plug flow at low shear rates, shear-banding at intermediate shear rates, and a linear profile at sufficiently high shear rate. These flow profiles coexist with Taylor vorticity bands [7,8]. The mechanism for shear-banding in these systems with a soft, long-ranged repulsive inter-particle potential is not related to shear-gradient induced mass transport that occurs in systems with a short-ranged interaction potential [9], but is due to the classic banding scenario related to strong shear-thinning behavior [7]. It is shown that there is a subtle interplay between the stress originating from inter-particle interactions within the domains and the texture stress due to inter-domain interactions [8,10]. References: [1] Phys. Rev. Lett. 110, 015901 (2013) [2] Soft Matter 9, 4401 (2013)[3] Soft Matter 10, 3311 (2014)[4] Scientific Reports 11, 3472 (2021), [5] J. Phys. Commun. 5, 065011 (2021)[6] J. Phys. Commun. 6, 015001 (2022)[7] Phys. Rev. Fluids 2, 043301 (2017)[8] J. Rheol. 66, 2, March 1st (2022)[9] Soft Matter 10, 9470 (2014) [10] J. Phys. Commun. 5, 045011 (2021)
000911210 536__ $$0G:(DE-HGF)POF4-5241$$a5241 - Molecular Information Processing in Cellular Systems (POF4-524)$$cPOF4-524$$fPOF IV$$x0
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000911210 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130749$$aForschungszentrum Jülich$$b0$$kFZJ
000911210 9131_ $$0G:(DE-HGF)POF4-524$$1G:(DE-HGF)POF4-520$$2G:(DE-HGF)POF4-500$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-5241$$aDE-HGF$$bKey Technologies$$lNatural, Artificial and Cognitive Information Processing$$vMolecular and Cellular Information Processing$$x0
000911210 9141_ $$y2022
000911210 920__ $$lyes
000911210 9201_ $$0I:(DE-Juel1)IBI-4-20200312$$kIBI-4$$lBiomakromolekulare Systeme und Prozesse$$x0
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000911210 980__ $$aI:(DE-Juel1)IBI-4-20200312
000911210 980__ $$aUNRESTRICTED