Coupled Modulated Bilayers (2009)
Hirose, Yuichi, Komura, Shigeyuki, Andelman, David
We propose a model addressing the coupling mechanism between two spatially modulated monolayers. We obtain the mean-field phase diagrams of coupled bilayers when the two monolayers have the same...
Beyond standard Poisson-Boltzmann theory: ion-specific interactions in aqueous solutions (2009)
Ben-Yaakov, Dan, Andelman, David, Harries, Daniel, Podgornik, Rudi
The Poisson-Boltzmann mean-field description of ionic solutions has been successfully used in predicting charge distributions and interactions between charged macromolecules. While the electrostatic...
Ben-Yaakov, Dan, Andelman, David, Harries, Daniel, Podgornik, Rudi
The forces between charged macromolecules, usually given in terms of osmotic pressure, are highly affected by the intervening ionic solution. While in most theoretical studies the solution is treated...
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...
Dipolar Poisson-Boltzmann Equation: Ions and Dipoles Close to Charged Surfaces (2007)
Abrashkin, Ariel, Andelman, David, Orland, Henri
We present an extension to the Poisson-Boltzmann model where the dipolar features of solvent molecules are taken explicitly into account. The formulation is derived at mean-field level and can be...
Electrostatic Interactions of Asymmetrically Charged Membranes (2007)
Ben-Yaakov, Dan, Burak, Yoram, Andelman, David, Safran, S. A.
We predict the nature (attractive or repulsive) and range (exponentially screened or long-range power law) of the electrostatic interactions of oppositely charged and planar plates as a function of...
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...
Ordering mechanisms in confined diblock copolymers (2006)
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...
Bending Moduli of Charged Membranes Immersed in Polyelectrolyte Solutions (2006)
We study the contribution of polyelectrolytes in solution to the bending moduli of charged membranes. Using the Helfrich free energy, and within the mean-field theory, we calculate the dependence of...
Phase Behavior of Polyelectrolyte-Surfactant Complexes at Planar Surfaces (2006)
We investigate theoretically the phase diagram of an insoluble charged surfactant monolayer in contact with a semi-dilute polyelectrolyte solution (of opposite charge). The polyelectrolytes are...
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...
Polyelectrolyte multilayer formation: electrostatics and short-range interactions (2005)
We investigate the phenomenon of multilayer formation via layer-by-layer deposition of alternating charge polyelectrolytes. Using mean-field theory, we find that a strong short-range attraction...
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,...
Ion Induced Lamellar-Lamellar Phase Transition in Charged Surfactant Systems (2005)
Harries, Daniel, Podgornik, Rudi, Parsegian, V. Adrian, Mar-Or, Etay, Andelman, David
We propose a model for the liquid-liquid phase transition observed in osmotic pressure measurements of certain charged lamellae-forming amphiphiles. The model free energy combines mean-field...
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...
Lin, Chin-Yet, Schick, Michael, Andelman, David
We study the phase behavior of diblock copolymers in presence of an external electric field. We employ self-consistent field theory and treat the relevant Maxwell equation as an additional...
Stripes of Partially Fluorinated Alkyl Chains: Dipolar Langmuir Monolayers (2005)
Schneider, Matthias F., Andelman, David, Tanaka, Motomu
Stripe-like domains of Langmuir monolayers formed by surfactants with partially fluorinated lipid anchors (F-alkyl lipids) are observed at the gas-liquid phase coexistence. The average periodicity of...
Competition between condensation of monovalent and multivalent ions in DNA aggregation (2004)
Burak, Yoram, Ariel, Gil, Andelman, David
We discuss the distribution of ions around highly charged PEs when there is competition between monovalent and multivalent ions, pointing out that in this case the number of condensed ions is...
Lateral phase separation in mixtures of lipids and cholesterol systems (2004)
Komura, Shigeyuki, Shirotori, Hisashi, Olmsted, Peter D., Andelman, David
In an effort to understand ``rafts'' in biological membranes, we propose phenomenological models for saturated and unsaturated lipid mixtures, and lipid-cholesterol mixtures. We consider simple...
Polyelectrolytes Adsorption: Chemical and Electrostatic Interactions (2003)
Mean-field theory is used to model polyelectrolyte adsorption and the possibility of overcompensation of charged surfaces. For charged surfaces that are also chemically attractive, the overcharging...
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...
Models of gemini surfactants (2003)
Diamant, Haim, Andelman, David
Gemini (dimeric) surfactants are composed of two monomeric surfactant molecules linked by a spacer chain. Their self-assembly behavior differs qualitatively from that of monomeric surfactants. We...
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 (2003)
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...
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 (2003)
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...
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...
The persistence length of a single, intrinsically rigid polyelectrolyte chain, above the Manning condensation threshold is investigated theoretically in presence of added salt. Using a loop expansion...
The unbinding transition of mixed fluid membranes (2002)
Komura, Shigeyugi, Andelman, David
A phenomenological model for the unbinding transition of multi-component fluid membranes is proposed, where the unbinding transition is described using a theory analogous to Flory-Huggins theory for...
Adhesion of membranes with competing specific and generic interactions (2002)
Weikl, Thomas R., Andelman, David, Komura, Shigeyuki, Lipowsky, Reinhard
Biomimetic membranes in contact with a planar substrate or a second membrane are studied theoretically. The membranes contain specific adhesion molecules (stickers) which are attracted by the second...
Neutral and Charged Polymers at Interfaces (2002)
Chain-like macromolecules (polymers) show characteristic adsorption properties due to their flexibility and internal degrees of freedom, when attracted to surfaces and interfaces. In this review we...
The persistence length of a single, strongly charged, stiff polyelectrolyte chain is investigated theoretically. Path integral formulation is used to obtain the effective electrostatic interaction...
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...
Polyelectrolytes in Solution and at Surfaces (2001)
Netz, Roland R., Andelman, David
This chapter deals with charged polymers (polyelectrolytes) in solution and at surfaces. The behavior of polyelectrolytes is markedly different from that of neutral polymers. In bulk solutions, i.e....
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...
Polyelectrolyte Adsorption (2000)
Andelman, David, Joanny, Jean-Francois
The problem of charged polymer chains (polyelectrolytes) as they adsorb on a planar surface is addressed theoretically. We review the basic mechanisms and theory underlying polyelectrolyte adsorption...
Supported Membranes on Chemically Structured and Rough Surfaces (2000)
We present a general linear response description of membrane adhesion at rough or chemically structured surfaces. Our method accounts for non-local Van der Waals effects and contains the more...
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...
Discrete aqueous solvent effects and possible attractive forces (2000)
We study discrete solvent effects on the interaction of two parallel charged surfaces in ionic aqueous solution. These effects are taken into account by adding a bilinear non-local term to the free...
Hydration interactions: aqueous solvent effects in electric double layers (2000)
A model for ionic solutions with an attractive short-range pair interaction between the ions is presented. The short-range interaction is accounted for by adding a quadratic non-local term to the...
Adsorbed and Grafted Polymers at Equilibrium (2000)
Andelman, David, Netz, Roland R.
This chapter deals with various aspects related to the adsorption of long chain-like macromolecules (polymers) onto solid surfaces. Physical aspects of the adsorption mechanism are elaborated mainly...
Adhesion-Induced Lateral Phase Separation in Membranes (2000)
Komura, Shigeyuki, Andelman, David
Adhesion between membranes is studied using a phenomenological model, where the inter-membrane distance is coupled to the concentration of sticker molecules on the membranes. The model applies to...
Binding of molecules to DNA and other semiflexible polymers (1999)
Diamant, Haim, Andelman, David
A theory is presented for the binding of small molecules such as surfactants to semiflexible polymers. The persistence length is assumed to be large compared to the monomer size but much smaller than...
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...
The Influence of Substrate Structure on Membrane Adhesion (1999)
We consider a membrane both weakly and strongly adhering to a geometrically structured substrate. The interaction potential is assumed to be local, via the Deryagin approximation, and harmonic....
Onset of Self-Assembly in Polymer-Surfactant Systems (1999)
Diamant, Haim, Andelman, David
The onset of self-assembly in a dilute aqueous solution containing a flexible polymer and surfactant is theoretically studied. Focusing on the effect of the surfactant on polymer conformation and...
Interfaces and Grain Boundaries of Lamellar Phases (1998)
Villain-Guillot, Simon, Netz, Roland R., Andelman, David, Schick, Michael
Interfaces between lamellar and disordered phases, and grain boundaries within lamellar phases, are investigated employing a simple Landau free energy functional. The former are examined using...
The Lamellar-Disorder Interface : One-Dimensional Modulated Profiles (1998)
Villain-Guillot, Simon, Andelman, David
We study interfacial behavior of a lamellar (stripe) phase coexisting with a disordered phase. Systematic analytical expansions are obtained for the interfacial profile in the vicinity of a...
Protein Adsorption on Lipid Monolayers at their Coexistence Region (1996)
Netz, Roland, Andelman, David, Orland, H.
We investigate theoretically the behavior of proteins as well as other macro-molecules which are incorporated into amphiphilic monolayers at the air-water interface. We assume the monolayer to be in...
Protein Adsorption on Lipid Monolayers at their Coexistence Region (1996)
Netz, Roland, Andelman, David, Orland, H.
We investigate theoretically the behavior of proteins as well as other macro-molecules which are incorporated into amphiphilic monolayers at the air-water interface. We assume the monolayer to be in...
Protein Adsorption on Lipid Monolayers at their Coexistence Region (1996)
Netz, Roland, Andelman, David, Orland, H.
We investigate theoretically the behavior of proteins as well as other macro-molecules which are incorporated into amphiphilic monolayers at the air-water interface. We assume the monolayer to be in...
Taniguchi, Takashi, Kawasaki, Kyozi, Andelman, David, Kawakatsu, Toshihiro
We investigate equilibrium shapes of vesicles composed of a mixture of partially miscible amphiphiles embedded in two- and three-dimensional space. The amphiphilic molecules can diffuse within the...
Taniguchi, Takashi, Kawasaki, Kyozi, Andelman, David, Kawakatsu, Toshihiro
We investigate equilibrium shapes of vesicles composed of a mixture of partially miscible amphiphiles embedded in two- and three-dimensional space. The amphiphilic molecules can diffuse within the...
Taniguchi, Takashi, Kawasaki, Kyozi, Andelman, David, Kawakatsu, Toshihiro
We investigate equilibrium shapes of vesicles composed of a mixture of partially miscible amphiphiles embedded in two- and three-dimensional space. The amphiphilic molecules can diffuse within the...
Electrostatic interactions in two-component membranes (1993)
Guttman, Glen, Andelman, David
The effect of electrostatic interactions on membrane undulations is examined. We consider a mixed membrane consisting of neutral and charged amphiphiles in an aqueous solution. In general, this...
Kawakatsu, Toshihiro, Andelman, David, Kawasaki, Kyozi, Taniguchi, Takashi
We investigate unilamellar membranes and vesicles composed of an A/B mixture of partially miscible amphiphiles. Assuming a simple bilinear coupling between relative composition and local curvature,...
Polymer adsorption on surfactant monolayers and heterogeneous solid surfaces (1993)
Andelman, David, Joanny, Jean-François
We study polymer adsorption on a flat but heterogeneous surface, in both cases where the heterogeneity is quenched or annealed. We always find that the heterogeneity of the adsorbing surface enhances...
Electrostatic interactions in two-component membranes (1993)
Guttman, Glen, Andelman, David
The effect of electrostatic interactions on membrane undulations is examined. We consider a mixed membrane consisting of neutral and charged amphiphiles in an aqueous solution. In general, this...
Kawakatsu, Toshihiro, Andelman, David, Kawasaki, Kyozi, Taniguchi, Takashi
We investigate unilamellar membranes and vesicles composed of an A/B mixture of partially miscible amphiphiles. Assuming a simple bilinear coupling between relative composition and local curvature,...
Polymer adsorption on surfactant monolayers and heterogeneous solid surfaces (1993)
Andelman, David, Joanny, Jean-François
We study polymer adsorption on a flat but heterogeneous surface, in both cases where the heterogeneity is quenched or annealed. We always find that the heterogeneity of the adsorbing surface enhances...
Electrostatic interactions in two-component membranes (1993)
Guttman, Glen, Andelman, David
The effect of electrostatic interactions on membrane undulations is examined. We consider a mixed membrane consisting of neutral and charged amphiphiles in an aqueous solution. In general, this...
Kawakatsu, Toshihiro, Andelman, David, Kawasaki, Kyozi, Taniguchi, Takashi
We investigate unilamellar membranes and vesicles composed of an A/B mixture of partially miscible amphiphiles. Assuming a simple bilinear coupling between relative composition and local curvature,...
Polymer adsorption on surfactant monolayers and heterogeneous solid surfaces (1993)
Andelman, David, Joanny, Jean-François
We study polymer adsorption on a flat but heterogeneous surface, in both cases where the heterogeneity is quenched or annealed. We always find that the heterogeneity of the adsorbing surface enhances...
Supervised by A. Nihat Berker.
Modulated structures and competing interactions in amphiphilic monolayers
Andelman, David, Brochard, Françoise, Joanny, Jean-François
We investigate the effects of electrostatic interactions on the phase behavior and structure of insoluble Langmuir monolayers at the liquid/air interface. Both for charged and neutral monolayers, the...
Onset of DNA Aggregation in Presence of Monovalent and Multivalent Counterions
Burak, Yoram, Ariel, Gil, Andelman, David
We address theoretically aggregation of DNA segments by multivalent polyamines such as spermine and spermidine. In experiments, the aggregation occurs above a certain threshold concentration of...
Modulated structures and competing interactions in amphiphilic monolayers
Andelman, David, Brochard, Françoise, Joanny, Jean-François
We investigate the effects of electrostatic interactions on the phase behavior and structure of insoluble Langmuir monolayers at the liquid/air interface. Both for charged and neutral monolayers, the...
Onset of DNA Aggregation in Presence of Monovalent and Multivalent Counterions
Burak, Yoram, Ariel, Gil, Andelman, David
We address theoretically aggregation of DNA segments by multivalent polyamines such as spermine and spermidine. In experiments, the aggregation occurs above a certain threshold concentration of...