Stability of Binary Mixtures in Electric Field Gradients (2009)
We consider the influence of electric field gradients on the phase behavior of nonpolar binary mixtures. Small fields give rise to smooth composition profiles, whereas large enough fields lead to a...
Interfacial Instability of Charged End-Group Polymer Brushes (2008)
Tsori, Yoav, Andelman, David, Joanny, Jean-François
We consider a polymer brush grafted to a surface (acting as an electrode) and bearing a charged group at its free end. Using a second distant electrode, the brush is subject to a constant electric...
Phase-Separation Transition in Liquid Mixtures Near Charged Objects (2007)
Marcus, Gilad, Samin, Sela, Tsori, Yoav
We study the thermodynamic behavior of nonpolar liquid mixtures in the vicinity of curved charged objects, such as electrodes or charged colloids. For small enough charge on the object, or...
Phase-separation of miscible liquids in a centrifuge (2007)
We show that a liquid mixture in the thermodynamically stable homogeneous phase can undergo a phase-separation transition when rotated at sufficiently high frequency $\omega$. This phase-transition...
We calculate the meniscus location in tapered capillaries under the influence of pressure difference and dielectrophoretic forces with and without gravity. We find that the meniscus location can be a...
Phase-separation in ion-containing mixtures in electric fields (2006)
When a liquid mixture is subjected to external electric fields, ionic screening leads to field gradients. We point out that if the mixture is initially in the homogeneous phase, this screening can...
Self Trapping of a Single Bacterium in its Own Chemoattractant (2006)
Tsori, Yoav, De Gennes, Pierre-Gilles
Bacteria (e.g. E. Coli) are very sensitive to certain chemoattractants (e.g. asparate) which they themselves produce. This leads to chemical instabilities in a uniform population. We discuss here the...
Damping of acoustic waves in dilute polymer solutions (2006)
Tsori, Yoav, De Gennes, Pierre-Gilles
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity...
Parallel and Perpendicular Lamellae on Corrugated Surfaces (2006)
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of...
Structural changes in block copolymers: coupling of electric field and mobile ions (2006)
Tsori, Yoav, Tournilhac, Francois, Andelman, David, Leibler, Ludwik
We consider the coupling between an external electric field and dissociated ions embedded in anisotropic polarizable media such as block copolymers. We argue that the presence of such ions can induce...
We consider orientational transitions of lamellar phases under the influence of a spatially nonuniform electric field. The transition between parallel and perpendicular lamellar stackings with...
Discontinuous liquid rise in capillaries with nonuniform cross-sections (2006)
We consider theoretically liquid rise against gravity in capillaries with height-dependent cross-section. For a conical capillary made from a hydrophobic surface and dipped in a liquid reservoir, the...
Coarse Graining in Block Copolymer Films (2006)
We present few ordering mechanisms in block copolymer melts in the coarse-graining approach. For chemically homogeneous or modulated confining surfaces, the surface ordering is investigated above and...
Tsori, Yoav, Andelman, David, Lin, Chin-Yet, Schick, M.
We compare two theoretical approaches to dielectric diblock copolymer melts in an external electric field. The first is a relatively simple analytic expansion in the relative copolymer concentration,...
Orientational transitions in symmetric diblock copolymers on rough surfaces (2005)
Tsori, Yoav, Sivaniah, Easan, Andelman, David, Hashimoto, Takeji
We present a model addressing the orientation transition of symmetric block copolymers such as PS/PMMA on smooth and rough surfaces. The distortion free energy of parallel and perpendicular lamellar...
Electrostatic Cancellation of Gravity Effects in Liquid Mixtures (2005)
We point out that a spatially-varying electric field can be used to cancel the effect of gravity in liquid mixtures by coupling to the different components' permittivities. Cancellation occurs if the...
Damping of acoustic waves in dilute polymer solutions (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity...
Self Trapping of a Single Bacterium in its Own Chemoattractant (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
Bacteria (e.g. E. Coli) are very sensitive to certain chemoattractants (e.g. asparate) which they themselves produce. This leads to chemical instabilities in a uniform population. We discuss here the...
Self Trapping of a Single Bacterium in its Own Chemoattractant (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
Bacteria (e.g. E. Coli) are very sensitive to certain chemoattractants (e.g. asparate) which they themselves produce. This leads to chemical instabilities in a uniform population. We discuss here the...
Damping of acoustic waves in dilute polymer solutions (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity...
Self Trapping of a Single Bacterium in its Own Chemoattractant (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
Bacteria (e.g. E. Coli) are very sensitive to certain chemoattractants (e.g. asparate) which they themselves produce. This leads to chemical instabilities in a uniform population. We discuss here the...
Damping of acoustic waves in dilute polymer solutions (2004)
Tsori, Yoav, De Gennes, Pierre-Gilles
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity...
Parallel and Perpendicular Lamellae on Corrugated Surfaces (2003)
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of...
Parallel and Perpendicular Lamellae on Corrugated Surfaces (2003)
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of...
Structural changes in block copolymers: coupling of electric field and mobile ions (2003)
Tsori, Yoav, Tournilhac, Francois, Andelman, David, Leibler, Ludwik
We consider the coupling between an external electric field and dissociated ions embedded in anisotropic polarizable media such as block copolymers. We argue that the presence of such ions can induce...
Parallel and Perpendicular Lamellae on Corrugated Surfaces (2003)
We consider the relative stability of parallel and perpendicular lamellar layers on corrugated surfaces. The model can be applied to smectic phases of liquid crystals, to lamellar phases of...
Structural changes in block copolymers: coupling of electric field and mobile ions (2003)
Tsori, Yoav, Tournilhac, Francois, Andelman, David, Leibler, Ludwik
We consider the coupling between an external electric field and dissociated ions embedded in anisotropic polarizable media such as block copolymers. We argue that the presence of such ions can induce...
Ordering mechanisms in confined diblock copolymers (2002)
We present several ordering mechanisms in diblock copolymers. For temperatures above the order-disorder temperature and in the weak segregation regime, a linear response theory is presented which...
Structural changes in block copolymers: coupling of electric field and mobile ions (2002)
Tsori, Yoav, Tournilhac, Francois, Andelman, David, Leibler, Ludwik
We consider the coupling between an external electric field and dissociated ions embedded in anisotropic polarizable media such as block copolymers. We argue that the presence of such ions can induce...
We examine the alignment of thin film diblock copolymers subject to a perpendicular electric field. Two regimes are considered separately: weak segregation and strong segregation. For weakly...
We study morphologies of thin-film diblock copolymers between two flat and parallel walls. The study is restricted to the weak segregation regime below the order-disorder transition temperature. The...
Surface induced ordering in thin film diblock copolymers: tilted lamellar phases (2001)
We investigate the effect of chemically patterned surfaces on the morphology of diblock copolymers below the order-disorder transition. Profiles for lamellar phases in contact with one surface, or...
Ordered Morphologies of Confined Diblock Copolymers (2001)
We investigate the ordered morphologies occurring in thin-films diblock copolymer. For temperatures above the order-disorder transition and for an arbitrary two-dimensional surface pattern, we use a...
Diblock copolymer ordering induced by patterned surfaces (2000)
We use a Ginzburg-Landau free energy functional to investigate diblock copolymer morphologies when the copolymer melt interacts with one surface or is confined between two chemically patterned...
Diblock Copolymer Ordering Induced by Patterned Surfaces Above the Order-Disorder Transition (2000)
We investigate the morphology of diblock copolymers in the vicinity of flat, chemically patterned surfaces. Using a Ginzburg-Landau free energy, spatial variations of the order parameter are given in...
Defects in Lamellar Diblock Copolymers: Chevron- and Omega-shaped Tilt Boundaries (1999)
Tsori, Yoav, Andelman, David, Schick, Michael
We investigate symmetric grain boundaries in a lamellar diblock copolymer system. The form of the interface between two grains strongly depends on the angle $\theta$, between the normals of the...
Phase-separation in ion-containing mixtures in electric fields
When a liquid mixture is subjected to external electric fields, ionic screening leads to field gradients. We point out that, if the mixture is initially in the homogeneous phase, this screening can...