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Papers by Henri Van Damme

Journal of Environment Quality, 2000

portance, sulfometuron 2-13-( 4.6-dimethylpyrimidin-2-yl) ureidosulfonylbenzoic acid, sulfate, ac... more portance, sulfometuron 2-13-( 4.6-dimethylpyrimidin-2-yl) ureidosulfonylbenzoic acid, sulfate, acetnte, and chloride on pillared clay was studied. Pillared clay (pe) is a very effcctive adsorbent of unioos froOl aqueolls solutioos. The fractions of sulfometuron adsorbed fraln aqucQUS solutions were more tlmn 90% of adclcd, but Iow soIubility limited the added amollotS. The maxiDlal adsorbed 3Dlollnt of sulfate was 0.72 mole kg-' and ofacetate \Vas 0.41 mole kg-' . Addition oflOO and 500 mM oC NnCl as fhe background eIectrolytc did oot affect fhe adsorption of sulfometuron, but drastically reduced the adsorption of sulfate and acetate. Acetate at 1000~fold larger excess competes with sulfometuron for the surface sites, but sulfate does noto Acetate decreased dramatically the adsorption of sulfate when both anions were added simultaneously, but acetate did not adsorb on the clay with pre~adsorbed sulfate. The sequence of adsorption affinity of anions to the pe surface is: sulfometuron > > sulfate> acetate > > chloride. The binding coefficient was 12 000 M-1 for sulfometuron, 650 M-1 for sulfate, 350 M-¡ for acetate, and 15 M-¡ for chloride. The dominant mode of sulfometuron adsorption on pe is vía strong electrostatic interactions. The proposed interactions of sulfate with pe are outer~ and inner~sphere complexation. The pH is reduced with sulfate adsorption and Al is released. The proposed mode of acetate interactions with pe is mainly vía inner-sphere complexation.

Journal of Volcanology and Geothermal Research, Apr 1, 1996

Injection of Newtonian crystal-free magmas into a partially crystallised host which may exhibit n... more Injection of Newtonian crystal-free magmas into a partially crystallised host which may exhibit non-Newtonian properties produces magmatic structures such as pipes, syn-plutonic dikes or dendritic structures. Field relationships between the structure and the host rock commonly indicate what the rheological contrasts during the injection were. The manner in which a magma deforms in response to injection is mainly linked to crystal content and strain rate (i.e., injection rate). Three kinds of behaviour can be distinguished: (1) Newtonian at low crystal contents; (2) Non-Newtonian at intermediate (40-60%) crystal contents, or at high crystal contents if the strain rate is small; and (3) brittle failure at high crystal content or strain rates. Petrologic observations indicate that injection can take place when the host magma still behaves as a fluid. To investigate the physics of the injection process we review the results of injection experiments in non-Newtonian fluids. These experiments were performed to study viscous fingering in 2-D Hele Shaw cells. They provide the first step to establishing the main non-Newtonian effects during the formation of interfacial instabilities arising when a Newtonian fluid is injected into a more viscous fluid or paste. The qualitative comparison of the morphological features of the interfaces between the fluids in the experiments with those in nature suggests that, in magmas, irregularities of the interfaces (dikes and dendrites) result from non-Newtonian properties of the host. We conclude that fluid-like deformation, rather than brittle behaviour of the host, during injection is likely to produce the general features observed on the field. Cooling effects might be responsible for the widespread phenomenon of fragmentation. We emphasise that the main effect of non-Newtonian properties in partially crystallised magmas is to generate strongly heterogeneous media producing discontinuities which could explain the main morphological features of syn-plutonic injection structures.

L'objectif de notre travail est de comprendre l'origine de deux propriétés remarquables de la ter... more L'objectif de notre travail est de comprendre l'origine de deux propriétés remarquables de la terre crue : d'une part, sa forte cohésion à l'état sec et, d'autre part, son remarquable pouvoir collant à l'état de boue. Nous montrons que la cohésion de la terre à l'état (apparemment) sec est essentiellement due aux forces capillaires générées par les quantités minimes d'eau de condensation en équilibre avec l'humidité atmosphérique. D'autre part, nous montrons que son pouvoir collant à l'état humide est lié à un phénomène de cavitation dans la solution aqueuse entre les grains solides. L'eau est impliquée dans les deux cas.

The Journal of Physical Chemistry, 1984

The method previously developed by us in part 1 of this work for the determination of the average... more The method previously developed by us in part 1 of this work for the determination of the average aggregation number in the adsorption layer of a nonionic surfactant (Triton X-100) at the silica-aqueous solution interface has been improved and extended to other surfactants of ...

Physical Review Letters, 2005

The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. ... more The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. It is shown that the use of rough spherical particles reduces the hydrodynamic lubrication forces between adjacent colloids and makes possible the study of the stress tensor anisotropy. At low shear rates, the suspension exerts an attractive force between two opposite surfaces, whereas at higher shear rates it becomes dilatant. Direct confocal microscopy observation of the particles organization reveal that crystallites form at high shear rate.

Clay Science, Apr 1, 2006

Polymer International, Mar 20, 2003

As a consequence of an increasingly wide range of application conditions, formulation of cementic... more As a consequence of an increasingly wide range of application conditions, formulation of cementicious materials is no longer restricted to specialty products but concerns increasingly widespread materials such as concrete. Adequate rheology (viscosity, yield stress, shear-thinning, etc), lack of ...

Polymer Bulletin, Jun 30, 1994

ABSTRACT Polyether-modified fullerenes have been prepared under mild conditions by reacting C60 o... more ABSTRACT Polyether-modified fullerenes have been prepared under mild conditions by reacting C60 or C70 in toluene with a precursor poly(oxyethylene) or poly(oxypropylene) polymer possessing amino end-groups. In the early stages of the interaction, soluble products are formed. Later, cross-linking proceeds between the polyfunctional fullerenes and the bifunctional polyethers. The non-crosslinked fullerene derivatives are soluble both in toluene and water; by evaporation of toluene, very adhesive films are formed.

Mrs Bulletin, Apr 30, 2004

... L. Cassar, A. Strini, E. Mapelli, L. Schiavi, C. Gobin, H. André, N. Moussiopoulos, A. Papado... more ... L. Cassar, A. Strini, E. Mapelli, L. Schiavi, C. Gobin, H. André, N. Moussiopoulos, A. Papadopoulos, J. Bartzis, T. Maggos, R. McIntyre, C. Lehaut-Burnouf, A. Henrichsen, P. Laugesen, R. Amadelli, D ... 41-21-693-46-73, fax 41-21-693-58-00, and e-mail frederic.heger@ epfl.ch. ...

In this communication, an efficient fractal estimation is proposed in a given frequency range. It... more In this communication, an efficient fractal estimation is proposed in a given frequency range. It is based on the maximum likelihood Whittle approximation for the stationary increments of fractional Brownian motion. Its efficiency is first shown on synthetic data generated by the Cholesky method. Then it is applied to smectite deposits on films analyzed by atomic force microscope. It is shown that the fractal parameter measured in the low frequency region allows to separate 3 groups of smectite clay images, and enables to recover chemical properties of the material.

Developments in Sedimentology

ABSTRACT

Materials Science Forum

ABSTRACT

Revue française de génie civil

Revue française de génie civil

Journal of Environment Quality, 2000

portance, sulfometuron 2-13-( 4.6-dimethylpyrimidin-2-yl) ureidosulfonylbenzoic acid, sulfate, ac... more portance, sulfometuron 2-13-( 4.6-dimethylpyrimidin-2-yl) ureidosulfonylbenzoic acid, sulfate, acetnte, and chloride on pillared clay was studied. Pillared clay (pe) is a very effcctive adsorbent of unioos froOl aqueolls solutioos. The fractions of sulfometuron adsorbed fraln aqucQUS solutions were more tlmn 90% of adclcd, but Iow soIubility limited the added amollotS. The maxiDlal adsorbed 3Dlollnt of sulfate was 0.72 mole kg-' and ofacetate \Vas 0.41 mole kg-' . Addition oflOO and 500 mM oC NnCl as fhe background eIectrolytc did oot affect fhe adsorption of sulfometuron, but drastically reduced the adsorption of sulfate and acetate. Acetate at 1000~fold larger excess competes with sulfometuron for the surface sites, but sulfate does noto Acetate decreased dramatically the adsorption of sulfate when both anions were added simultaneously, but acetate did not adsorb on the clay with pre~adsorbed sulfate. The sequence of adsorption affinity of anions to the pe surface is: sulfometuron > > sulfate> acetate > > chloride. The binding coefficient was 12 000 M-1 for sulfometuron, 650 M-1 for sulfate, 350 M-¡ for acetate, and 15 M-¡ for chloride. The dominant mode of sulfometuron adsorption on pe is vía strong electrostatic interactions. The proposed interactions of sulfate with pe are outer~ and inner~sphere complexation. The pH is reduced with sulfate adsorption and Al is released. The proposed mode of acetate interactions with pe is mainly vía inner-sphere complexation.

Journal of Volcanology and Geothermal Research, Apr 1, 1996

Injection of Newtonian crystal-free magmas into a partially crystallised host which may exhibit n... more Injection of Newtonian crystal-free magmas into a partially crystallised host which may exhibit non-Newtonian properties produces magmatic structures such as pipes, syn-plutonic dikes or dendritic structures. Field relationships between the structure and the host rock commonly indicate what the rheological contrasts during the injection were. The manner in which a magma deforms in response to injection is mainly linked to crystal content and strain rate (i.e., injection rate). Three kinds of behaviour can be distinguished: (1) Newtonian at low crystal contents; (2) Non-Newtonian at intermediate (40-60%) crystal contents, or at high crystal contents if the strain rate is small; and (3) brittle failure at high crystal content or strain rates. Petrologic observations indicate that injection can take place when the host magma still behaves as a fluid. To investigate the physics of the injection process we review the results of injection experiments in non-Newtonian fluids. These experiments were performed to study viscous fingering in 2-D Hele Shaw cells. They provide the first step to establishing the main non-Newtonian effects during the formation of interfacial instabilities arising when a Newtonian fluid is injected into a more viscous fluid or paste. The qualitative comparison of the morphological features of the interfaces between the fluids in the experiments with those in nature suggests that, in magmas, irregularities of the interfaces (dikes and dendrites) result from non-Newtonian properties of the host. We conclude that fluid-like deformation, rather than brittle behaviour of the host, during injection is likely to produce the general features observed on the field. Cooling effects might be responsible for the widespread phenomenon of fragmentation. We emphasise that the main effect of non-Newtonian properties in partially crystallised magmas is to generate strongly heterogeneous media producing discontinuities which could explain the main morphological features of syn-plutonic injection structures.

L'objectif de notre travail est de comprendre l'origine de deux propriétés remarquables de la ter... more L'objectif de notre travail est de comprendre l'origine de deux propriétés remarquables de la terre crue : d'une part, sa forte cohésion à l'état sec et, d'autre part, son remarquable pouvoir collant à l'état de boue. Nous montrons que la cohésion de la terre à l'état (apparemment) sec est essentiellement due aux forces capillaires générées par les quantités minimes d'eau de condensation en équilibre avec l'humidité atmosphérique. D'autre part, nous montrons que son pouvoir collant à l'état humide est lié à un phénomène de cavitation dans la solution aqueuse entre les grains solides. L'eau est impliquée dans les deux cas.

The Journal of Physical Chemistry, 1984

The method previously developed by us in part 1 of this work for the determination of the average... more The method previously developed by us in part 1 of this work for the determination of the average aggregation number in the adsorption layer of a nonionic surfactant (Triton X-100) at the silica-aqueous solution interface has been improved and extended to other surfactants of ...

Physical Review Letters, 2005

The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. ... more The flow anisotropy of a concentrated colloidal suspension at the jamming transition is studied. It is shown that the use of rough spherical particles reduces the hydrodynamic lubrication forces between adjacent colloids and makes possible the study of the stress tensor anisotropy. At low shear rates, the suspension exerts an attractive force between two opposite surfaces, whereas at higher shear rates it becomes dilatant. Direct confocal microscopy observation of the particles organization reveal that crystallites form at high shear rate.

Clay Science, Apr 1, 2006

Polymer International, Mar 20, 2003

As a consequence of an increasingly wide range of application conditions, formulation of cementic... more As a consequence of an increasingly wide range of application conditions, formulation of cementicious materials is no longer restricted to specialty products but concerns increasingly widespread materials such as concrete. Adequate rheology (viscosity, yield stress, shear-thinning, etc), lack of ...

Polymer Bulletin, Jun 30, 1994

ABSTRACT Polyether-modified fullerenes have been prepared under mild conditions by reacting C60 o... more ABSTRACT Polyether-modified fullerenes have been prepared under mild conditions by reacting C60 or C70 in toluene with a precursor poly(oxyethylene) or poly(oxypropylene) polymer possessing amino end-groups. In the early stages of the interaction, soluble products are formed. Later, cross-linking proceeds between the polyfunctional fullerenes and the bifunctional polyethers. The non-crosslinked fullerene derivatives are soluble both in toluene and water; by evaporation of toluene, very adhesive films are formed.

Mrs Bulletin, Apr 30, 2004

... L. Cassar, A. Strini, E. Mapelli, L. Schiavi, C. Gobin, H. André, N. Moussiopoulos, A. Papado... more ... L. Cassar, A. Strini, E. Mapelli, L. Schiavi, C. Gobin, H. André, N. Moussiopoulos, A. Papadopoulos, J. Bartzis, T. Maggos, R. McIntyre, C. Lehaut-Burnouf, A. Henrichsen, P. Laugesen, R. Amadelli, D ... 41-21-693-46-73, fax 41-21-693-58-00, and e-mail frederic.heger@ epfl.ch. ...

In this communication, an efficient fractal estimation is proposed in a given frequency range. It... more In this communication, an efficient fractal estimation is proposed in a given frequency range. It is based on the maximum likelihood Whittle approximation for the stationary increments of fractional Brownian motion. Its efficiency is first shown on synthetic data generated by the Cholesky method. Then it is applied to smectite deposits on films analyzed by atomic force microscope. It is shown that the fractal parameter measured in the low frequency region allows to separate 3 groups of smectite clay images, and enables to recover chemical properties of the material.

Developments in Sedimentology

ABSTRACT

Materials Science Forum

ABSTRACT

Revue française de génie civil

Revue française de génie civil