title: Shear viscosity and structural scalings in model adhesive hard-sphere gels.
abstract: We present experiments and simulations that show a fundamental scaling for both the rheology and microstructure of flowing gels. Unique flow-SANS measurements demonstrate that the structure orients along both the neutral and compression axis. We quantify the anisotropy using a single parameter, α, that scales by a dimensionless number, M^{'}, that arises from a force balance on a particle. Simulations support the scalings and confirm the results are independent of the shape and range of the potential suggesting a universal for colloidal gels with short-ranged attractions.
authors.affiliation: NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA and Center for Neutron Science and Department of Chemical & Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Aaron P R
authors.initials: AP
authors.lastname: Eberle
authors.affiliation: Building and Fire Research Laboratory, NIST, Gaithersburg, Maryland 20899, USA.
authors.forename: Nicos
authors.initials: N
authors.lastname: Martys
authors.affiliation: Large Scale Structures Group, Institut Laue-Langevin, Grenoble, France.
authors.forename: Lionel
authors.initials: L
authors.lastname: Porcar
authors.affiliation: NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA.
authors.forename: Steven R
authors.initials: SR
authors.lastname: Kline
authors.affiliation: NIST Information Technology Laboratory, Gaithersburg, Maryland 20899, USA.
authors.forename: William L
authors.initials: WL
authors.lastname: George
authors.affiliation: Center for Neutron Science and Department of Chemical & Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Jung M
authors.initials: JM
authors.lastname: Kim
authors.affiliation: NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Butler
authors.affiliation: Center for Neutron Science and Department of Chemical & Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Norman J
authors.initials: NJ
authors.lastname: Wagner
mesh_terms: D000269:Adhesives / Q000737:chemistry*; D016880:Anisotropy; D003102:Colloids; D019245:Compressive Strength; D003198:Computer Simulation; D055119:Elastic Modulus; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular; D012212:Rheology / Q000379:methods*; D033081:Shear Strength; D058428:Silica Gel / Q000737:chemistry*; D013314:Stress, Mechanical; D014783:Viscosity
chemical_list: D000269:Adhesives; D003102:Colloids; D058428:Silica Gel