Zippelius, Annette

[["dc.bibliographiccitation.firstpage","14001"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","EPL"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Mokhtari, Zahra"],["dc.contributor.author","Aspelmeier, Timo"],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2020-12-10T18:41:38Z"],["dc.date.available","2020-12-10T18:41:38Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1209/0295-5075/120/14001"],["dc.identifier.eissn","1286-4854"],["dc.identifier.issn","0295-5075"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/77635"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Collective rotations of active particles interacting with obstacles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","214905"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","The Journal of Chemical Physics"],["dc.bibliographiccitation.volume","124"],["dc.contributor.author","Wald, Christian"],["dc.contributor.author","Goldbart, Paul M."],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T09:41:48Z"],["dc.date.available","2018-11-07T09:41:48Z"],["dc.date.issued","2006"],["dc.description.abstract","We consider a microscopic model of a polymer blend that is prone to phase separation. Permanent cross-links are introduced between randomly chosen pairs of monomers, drawn from the Deam-Edwards distribution. Thereby, not only density but also concentration fluctuations of the melt are quenched-in in the gel state, which emerge upon sufficient cross-linking. We derive a Landau expansion in terms of the order parameters for gelation and phase separation, and analyze it on the mean-field level, including Gaussian fluctuations. The mixed gel is characterized by thermal as well as time-persistent (glassy) concentration fluctuations. Whereas the former are independent of the preparation state, the latter reflect the concentration fluctuations at the instant of cross-linking, provided the mesh size is smaller than the correlation length of phase separation. The mixed get becomes unstable to microphase separation upon lowering the temperature in the gel phase. Whereas the length scale of microphase separation is given by the mesh size, at least close to the transition, the emergent microstructure depends on the composition and compressibility of the melt. Hexagonal structures, as well as lamellas or random structures with a unique wavelength, can be energetically favorable. (c) 2006 American Institute of Physics."],["dc.identifier.doi","10.1063/1.2200697"],["dc.identifier.isi","000238758700049"],["dc.identifier.pmid","16774440"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33812"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","1089-7690"],["dc.relation.issn","0021-9606"],["dc.title","Glassy correlations and microstructures in randomly cross-linked homopolymer blends"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","051802"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Physical Review. E"],["dc.bibliographiccitation.volume","77"],["dc.contributor.author","Xing, Xiangjun"],["dc.contributor.author","Pfahl, Stephan"],["dc.contributor.author","Mukhopadhyay, Swagatam"],["dc.contributor.author","Goldbart, Paul M."],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T11:15:48Z"],["dc.date.available","2018-11-07T11:15:48Z"],["dc.date.issued","2008"],["dc.description.abstract","A Landau theory is constructed for the gelation transition in cross-linked polymer systems possessing spontaneous nematic ordering, based on symmetry principles and the concept of an order parameter for the amorphous solid state. This theory is substantiated with help of a simple microscopic model of cross-linked dimers. Minimization of the Landau free energy in the presence of nematic order yields the neoclassical theory of the elasticity of nematic elastomers and, in the isotropic limit, the classical theory of isotropic elasticity. These phenomenological theories of elasticity are thereby derived from a microscopic model, and it is furthermore demonstrated that they are universal mean-field descriptions of the elasticity for all chemical gels and vulcanized media."],["dc.identifier.doi","10.1103/PhysRevE.77.051802"],["dc.identifier.isi","000256885400084"],["dc.identifier.pmid","18643092"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54445"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1539-3755"],["dc.title","Nematic elastomers: From a microscopic model to macroscopic elasticity theory"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","3161"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Macromolecules"],["dc.bibliographiccitation.lastpage","3164"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","von der Heydt, Alice"],["dc.contributor.author","Mueller, Marcus"],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T08:44:08Z"],["dc.date.available","2018-11-07T08:44:08Z"],["dc.date.issued","2010"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [SFB-602/B6]"],["dc.identifier.doi","10.1021/ma100192n"],["dc.identifier.isi","000276232800010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20130"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0024-9297"],["dc.title","Sequence Fractionation in Symmetric Random Block Copolymers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5360"],["dc.bibliographiccitation.issue","25"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.lastpage","5363"],["dc.bibliographiccitation.volume","85"],["dc.contributor.author","Broderix, K."],["dc.contributor.author","Bhattacharya, K. K."],["dc.contributor.author","Cavagna, A."],["dc.contributor.author","Zippelius, Annette"],["dc.contributor.author","Giardina, I."],["dc.date.accessioned","2018-11-07T09:17:56Z"],["dc.date.available","2018-11-07T09:17:56Z"],["dc.date.issued","2000"],["dc.description.abstract","Molecular dynamics simulations are used to generate an ensemble of saddles of the potential energy of a Lennard-Jones liquid. Classifying all extrema by their potential energy u and number of unstable directions k, a well-defined relation k(u) is revealed. The degree of instability of typical stationary points vanishes at a threshold potential energy u(th), which lies above the energy of the lowest glassy minima of the system. The energies of the inherent states, as obtained by the Stillinger-Weber method, approach u(th) at a temperature close to the mode-coupling transition temperature T-c."],["dc.identifier.doi","10.1103/PhysRevLett.85.5360"],["dc.identifier.isi","000165884200025"],["dc.identifier.pmid","11135996"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28291"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Energy landscape of a Lennard-Jones liquid: Statistics of stationary points"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","68003"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","EPL"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Vogel, Florian"],["dc.contributor.author","Zippelius, Annette"],["dc.contributor.author","Fuchs, Matthias"],["dc.date.accessioned","2020-12-10T18:41:38Z"],["dc.date.available","2020-12-10T18:41:38Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1209/0295-5075/125/68003"],["dc.identifier.eissn","1286-4854"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/77637"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Emergence of Goldstone excitations in stress correlations of glass-forming colloidal dispersions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","65"],["dc.bibliographiccitation.journal","Neurocomputing"],["dc.bibliographiccitation.lastpage","71"],["dc.bibliographiccitation.volume","38"],["dc.contributor.author","Trommershauser, J."],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T09:01:49Z"],["dc.date.available","2018-11-07T09:01:49Z"],["dc.date.issued","2001"],["dc.description.abstract","A stochastic model of synaptic transmission has been designed on the basis of electrophysiological experiments. The model includes presynaptic mechanisms of recruitment and calcium related release of vesicles, transmitter dynamics in the cleft and postsynaptic receptor kinetics. Monte Carlo simulations of a single synaptic connection are performed and demonstrate that synapses depress during repetitive presynaptic stimulation due to depletion of presynaptic vesicles as well as receptor desensitization. Only for stimulation frequencies below 40 Hz depression is caused solely presynaptically by depletion of vesicles. It is shown that specific physiological conditions determine the frequency dependence of steady state depression currents and set limits on the range of possibly rate-coded transmission. (C) 2001 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0925-2312(01)00486-6"],["dc.identifier.isi","000169129200010"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24523"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","9th Annual Computational Neuroscience Meeting (CNS*00)"],["dc.relation.eventlocation","BRUGGE, BELGIUM"],["dc.relation.issn","0925-2312"],["dc.title","Biophysical model of a single synaptic connection: Transmission properties are determined by the cooperation of pre- and postsynaptic mechanisms"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","198301"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","99"],["dc.contributor.author","Benetatos, Panayotis"],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T10:54:12Z"],["dc.date.available","2018-11-07T10:54:12Z"],["dc.date.issued","2007"],["dc.description.abstract","Motivated by the organization of cross-linked cytoskeletal biopolymers, we present a semimicroscopic replica field theory for the formation of anisotropic random networks of semiflexible polymers. The networks are formed by introducing random permanent cross-links which fix the orientations of the corresponding polymer segments to align with one another. Upon increasing the cross-link density, we obtain a continuous gelation transition from a fluid phase to a gel where a finite fraction of the system gets localized at random positions. For sufficiently stiff polymers, this positional localization is accompanied by a continuous isotropic-to-nematic (IN) transition occurring at the same cross-link density. As the polymer stiffness decreases, the IN transition becomes first order, shifts to a higher cross-link density, and is preceded by an amorphous solid where the average polymer orientations freeze in random directions."],["dc.identifier.doi","10.1103/PhysRevLett.99.198301"],["dc.identifier.isi","000250810500074"],["dc.identifier.pmid","18233121"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49514"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Anisotropic random networks of semiflexible polymers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","041505"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Physical Review. E"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","Broderix, K."],["dc.contributor.author","Mueller, P."],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2018-11-07T10:31:02Z"],["dc.date.available","2018-11-07T10:31:02Z"],["dc.date.issued","2002"],["dc.description.abstract","A simple Rouse-type model, generalized to incorporate the effects of chemical cross-links, is used to obtain a theoretical prediction for the critical behavior of the normal-stress coefficients Psi(1) and Psi(2) in polymeric liquids when approaching the gelation transition from the sol side. While the exact calculation shows Psi(2)=0, a typical result for these types of models, an additional scaling ansatz is used to demonstrate that Psi(1) diverges with a critical exponent l=k+z. Here, k denotes the critical exponent of the shear viscosity and z the exponent governing the divergence of the time scale in the Kohlrausch decay of the shear-stress relaxation function. For cross-links distributed according to mean-field percolation, this scaling relation yields l=3, in accordance with an exact expression for the first normal-stress coefficient based on a replica calculation. Alternatively, using three-dimensional percolation for the cross-link ensemble we find the value lapproximate to4.9. Results on time-dependent normal-stress response are also presented."],["dc.identifier.doi","10.1103/PhysRevE.65.041505"],["dc.identifier.isi","000175146400035"],["dc.identifier.pmid","12005827"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/44004"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1539-3755"],["dc.title","Normal stresses at the gelation transition"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","154907"],["dc.bibliographiccitation.issue","15"],["dc.bibliographiccitation.journal","The Journal of Chemical Physics"],["dc.bibliographiccitation.volume","124"],["dc.contributor.author","Otto, Matthias"],["dc.contributor.author","Aspelmeier, Timo"],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2021-06-01T10:51:02Z"],["dc.date.available","2021-06-01T10:51:02Z"],["dc.date.issued","2006"],["dc.identifier.doi","10.1063/1.2186325"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/86866"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.eissn","1089-7690"],["dc.relation.issn","0021-9606"],["dc.title","Microscopic dynamics of thin hard rods"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]