Browsing HML Preprints 2005 by Title
Now showing items 1-13 of 13
-
Controlling the Location and Spatial Extent of Nanobubbles Using Hydrophobically Nanopatterned Surfaces
(2005-08-22)The presence of nanobubbles—as imaged with tapping-mode atomic force microscopy— is controlled using nanopatterned surfaces possessing repeating patterns of polystyrene (hydrophobic domains) and polymethyl-methacrylate ... -
Dimensionless Groups For Understanding Free Surface Flows of Complex Fluids
(2005-06-09)No abstract -
Ex vivo Rheology of Spider Silk
(2005-08-05)We investigate the rheological properties of microliter quantities of the spinning material extracted ex vivo from the major ampullate gland of a Nephila clavipes spider using two new micro-rheometric devices. A sliding ... -
Iterated Stretching and Multiple Beads-on-a-String Phenomena in Dilute Solutions of Highly-Extensible Flexible Polymers
(2005-04-13)The dynamics of elastocapillary thinning in high molecular weight polymer solutions are re-examined using high-speed digital video microscopy. At long times, the evolution of the viscoelastic thread deviates from self-similar ... -
Iterated Stretching, Extensional Rheology and Formation of Beads-on-a-String Structures in Polymer Solutions
(2005-12-01)The transient extensional rheology and the dynamics of elastocapillary thinning in aqueous solutions of polyethylene oxide (PEO) are studied with high-speed digital video microscopy. At long times, the evolution of the ... -
Miscibility and Viscoelastic Properties of Acrylic Polyhedral Oligomeric Silsesquioxane-Poly(methyl methacrylate) Blends
(2005-04-19)We investigate the miscibility of acrylic polyhedral oligomeric silsesquioxanes (POSS) [characteristic size d ≈ 2 nm] and poly(methyl methacrylate)(PMMA) in order to determine the effect of well-dispersed POSS nanoparticles ... -
Nonlinear Shear and Extensional Flow Dynamics of Wormlike Surfactant Solutions
(2005-10-04)Nonlinear shear and extensional flow dynamics of rheological properties of a wormlike micellar solution based on erucyl bis (2-hydroxyethyl) methyl ammonium chloride, EHAC, are reported here. The influences of surfactant ... -
Rheology and Dynamics of Associative Polymers in Shear and Extension: Theory and Experiment
(2005-08-22)We investigate the steady and transient shear and extensional rheological properties of a series of model hydrophobically modified ethoxylate-urethane (HEUR) polymers with varying degrees of hydrophobicity. A new nonlinear ... -
Shock Dynamics in Particle-Laden Thin Films
(2005-04-22)We present theory and experiments for thin film particle-laden flow on an incline. At higher particle concentration and inclination angle, a new phenomenon is observed in which a large particle-rich ridge forms at the ... -
Slippage and Migration in Taylor-Couette Flow of a Model for Dilute Wormlike Micellar Solutions
(2005-06-09)In this paper we explore a model, most appropriate for dilute or semi-dilute worm-like micellar solutions, in an axisymmetric circular Taylor-Couette geometry. This study is a natural continuation of earlier work on ... -
Thermorheological Properties Near the Glass Transition of Oligomeric Poly(methyl methacrylate) Blended with Acrylic Polyhedral Oligomeric Silsesquioxane Nanocages
(2005-08-26)Two distinct oligomeric species of similar mass and chemical functionality (Mw ≈ 2,000 g/mol), one a linear methyl methacrylate oligomer (radius of gyration Rg ≈ 1.1 nm) and the other a hybrid organic-inorganic polyhedral ... -
Two-Dimensional Self-Assembly in Diblock Copolymers
(2005-06-20)Diblock copolymers confined to a two-dimensional surface may produce uniform features of macromolecular dimensions (10 − 100 nm). We present a mathematical model for nanoscale pattern formation in such polymers which ... -
Visco-Elasto-Capillary Thinning and Break-Up of Complex Fluids
(2005-06-09)The progressive break-up of an initially stable fluid column or thread into a number of smaller droplets is an important dynamical process that impacts many commercial operations from spraying and atomization of fertilizers ...
