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Browsing Hatsopoulos Microfluids Laboratory (HML) by Title

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Browsing Hatsopoulos Microfluids Laboratory (HML) by Title

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  • Clasen, Christian; Eggers, Jens; Fontelos, Marco A.; Li, Jie; McKinley, Gareth H. (2007-01-23)
    By adding minute concentrations of a high molecular weight polymer, liquid jets or bridges collapsing under the action of surface tension develop a characteristic shape of uniform threads connecting spherical uid drops. ...
  • Rodd, Lucy E.; Scott, Timothy P.; Cooper-White, Justin J.; McKinley, Gareth H. (2004-11-01)
    We investigate the dynamics of the capillary thinning and break-up process for low viscosity elastic fluids such as dilute polymer solutions. Standard measurements of the evolution of the midpoint diameter of the necking ...
  • Agrawal, Abhinandan; Park, Juhyun; Ryu, Du Y.; Hammond, Paula T.; Russell, Thomas P.; McKinley, Gareth H. (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 ...
  • Stocker, Roman; Hosoi, A.E. (2004-08-24)
    A lubrication-flow model for a free film in a corner is presented. The model, written in the hyperbolic coordinate system ξ = x² – y², η = 2xy, applies to films that are thin in the η direction. The lubrication approximation ...
  • McKinley, Gareth H. (2005-06-09)
    No abstract
  • Tirtaatmadja, Viyada; McKinley, Gareth H.; Cooper-White, Justin J. (2007-01-23)
    The dynamics of drop formation and pinch-off have been investigated for a series of low viscosity elastic fluids possessing similar shear viscosities, but differing substantially in elastic properties. On initial approach ...
  • Nielsen, Jens K.; Rasmussen, Henrik K.; Hassager, Ole; McKinley, Gareth H. (2007-01-23)
    The startup and steady uniaxial elongational viscosity have been measured for two monodisperse polystyrene melts with molecular weights of 52 kg/mole and 103 kg/mole, and for three bidisperse polystyrene melts. The ...
  • Yu, Tony S.; Lauga, Eric; Hosoi, A.E. (2007-05-04)
    A simple way to generate propulsion at low Reynolds number is to periodically oscillate a passive flexible filament. Here we present a macroscopic experimental investigation of such a propulsive mechanism. A robotic swimmer ...
  • Kojic, Nikola; Bico, Jose; Clasen, Christian; McKinley, Gareth H. (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 ...
  • Clasen, Christian; Gearing, Brian P.; McKinley, Gareth H. (2007-01-23)
    We describe the design and construction of a new microrheometer designed to facilitate the viscometric study of complex fluids with very small sample volumes (1-10 μl)and gaps of micrometer dimensions. The Flexure-based ...
  • Clasen, Christian; Plog, J.P.; Kulicke, W.-M.; Owens, M.; Macosko, C.; Scriven, L.E.; Verani, M.; McKinley, Gareth H. (2007-01-23)
    We investigate the concentration-dependence of the characteristic relaxation time of dilute polymer solutions in transient uniaxial elongational flow. A series of monodisperse polystyrene solutions of five different ...
  • Buckley, Patrick R.; McKinley, Gareth H.; Wilson, Thomas S.; Small IV, Ward; Benett, William J.; Bearinger, Jane P.; McElfresh, Michael W.; Maitland, Duncan J. (2007-01-23)
    Presently there is interest in making medical devices such as expandable stents and intravascular microactuators from shape memory polymer (SMP). One of the key challenges in realizing SMP medical devices is the implementation ...
  • Rodd, Lucy E.; Scott, Timothy P.; Boger, David V.; Cooper-White, Justin J.; McKinley, Gareth H. (2004-12-17)
    The non-Newtonian flow of dilute aqueous polyethylene oxide (PEO) solutions through microfabricated planar abrupt contraction-expansions is investigated. The contraction geometries are fabricated from a high-resolution ...
  • Oliveira, Monica S. N.; McKinley, Gareth H. (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 ...
  • Oliveira, Monica S. N.; Yeh, Roger; McKinley, Gareth H. (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 ...
  • Ng, Trevor S.K.; McKinley, Gareth H.; Padmanabhan, Mahesh (2007-01-23)
    We provide an overview of transient extensional rheometry techniques for wheat flour doughs in which the deformation and material response is well defined. The behavior of a range of model doughs was explored with a ...
  • Kopesky, Edward T.; Haddad, Timothy S.; McKinley, Gareth H.; Cohen, Robert E. (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 ...
  • Yesilata, B.; Clasen, Christian; McKinley, Gareth H. (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 ...
  • Hosoi, A.E.; Mahadevan, L. (PRL, 2004)
    We consider the dynamics of an elastic sheet lubricated by the flow of a thin layer of fluid that separates it from a rigid wall. By considering long wavelength deformations of the sheet, we derive an evolution equation ...
  • James-Korley, LaShanda T.; Liff, Shawna M.; Kumar, Nitin; McKinley, Gareth H.; Hammond, Paula T. (2007-01-23)
    Controlling the level of dispersion of silicate layers in polymer matrices through intermolecular interactions and exploiting these interactions to enhance thermomechanical behavior are key challenges in the field of polymer ...
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