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John Christopher Plummer

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Publications associées (97)

Water adsorption on a sodium smectite clay surface: an ab initio study

John Christopher Plummer, Pascal Clausen

Using calculations based on density-functional theory, we explore the configurations that water molecules (2,3,4;6) assume on the surface a sodium 2:1 smectite clay with isomorphic substitutions both on octahedral and tetrahedral sheets. The hydrophilicity ...

2009

Frequency dependent dielectric and mechanical behaviour of elastomers for actuator applications

Yves Leterrier, Frank Nüesch, John Christopher Plummer, Martin Molberg

The low frequency mechanical and dielectric behavior of three different elastomers has been investigated by dynamic mechanical analysis and dielectric spectroscopy, with the aim of accounting for the frequency dependence of the characteristics of the corre ...

American Institute of Physics2009

Equilibrium desorption isotherms of water, ethanol, ethyl acetate and toluene on a sodium smectite clay

John Christopher Plummer, Pascal Clausen

Desorption isotherms for water, ethanol, ethyl acetate and toluene from a sodium smectite clay have been determined by both dynamic vapor sorption (DVS) measurements and Knudsen thermogravimetry (KTGA), at the exception of toluene that was measured only by ...

Springer Netherlands2009

High k Dielectric Elastomeric Materials for Low Voltage Applications

Yves Leterrier, Frank Nüesch, John Christopher Plummer, Martin Molberg

2009

Hybrid glass mat reinforced polypropylene-montmorillonite nanocomposites

John Christopher Plummer, Véronique Michaud, Chrystèle Houphouet-Boigny Favre, Sara Dalle Vacche

Although addition of montmorillonite (MMT) clay to isotactic polypropylene (iPP) results in large increases in the melt viscosity at low shear rates, satisfactory impregnation of glass mats is obtained with iPP/MMT under conditions typical of industrial pr ...

Trans Tech Publications Ltd, Laublsrutistr 24, Ch-8717 Stafa-Zurich, Switzerland2009

Solidification Behaviour Of PLLA/nHA Nanocomposites

Pierre-Etienne Bourban, John Christopher Plummer, Claire Diane Delabarde

PLLA crystallization rates increase with nHA content owing to increased nucleation, which compensates a decrease in spherulite growth rate, G, at 100 to 130 °C, and to suppression of the twin peak in G(T) seen in pure PLLA, linked to a transition from the ...

2009

Highly filled Polystyrene-laponite nanocomposites prepared by emulsion polymerization

John Christopher Plummer, Riccardo Ruggerone

Polystyrene-based nanocomposite films containing up to 20 wt% laponite clay have been prepared by emulsion polymerization. Significant increases in the storage and tensile moduli were observed in both the glassy and rubbery state on laponite addition. Howe ...

2009

Fracture mechanisms in polystyrene/laponite nanocomposites prepared by emulsion polymerization

John Christopher Plummer, Riccardo Ruggerone

Transmission electron microscopy (TEM) has been used to investigate the effect of laponite clay on microdeformation in thin latex-based polystyrene (PS) films, in which the laponite was concentrated at the original interfaces between the PS particles. At r ...

2009

Adsorption of low-molecular-weight molecules on the surface of a sodium smectite clay: an ab initio study

John Christopher Plummer, Wanda Andreoni, Pascal Clausen, Alessandro Curioni

We present a study of the adsorption of single molecules of volatiles, such as water, ethanol, ethyl acetate, pyridine, toluene, and n-octane, on the dry surface of a smectite clay using a series of calculations based on density functional theory. Our clay ...

2009

Hybrid glass mat reinforced polypropylene-montmorillonite nanocomposites

John Christopher Plummer, Véronique Michaud, Chrystèle Houphouet-Boigny Favre, Sara Dalle Vacche

2008

Deformation and fracture in isotactic polypropylene glass mat thermoplastic composites modified with montmorillonite clay

John Christopher Plummer, Chrystèle Houphouet-Boigny Favre, Sara Dalle Vacche

Satisfactory impregnation of glass fiber mats may be obtained with isotactic polypropylene/montmorillonite (MMT) nanocomposites under conditions comparable with industrial conditions. However, it is demonstrated here that the high melt viscosity of the nan ...

2008

Cohesion and adhesion of nanoporous TiO2 coatings on titanium wires for photovoltaic applications

Yves Leterrier, John Christopher Plummer, Nelson Da Costa

The working electrode of a dye-sensitized photovoltaic fiber is constituted of a porous TiO2 coated titanium wire. The cohesion and adhesion of such a brittle oxide coating on the ductile metal substrate are identified as crucial factors in maintaining pho ...

Elsevier2008

Hybrid glass fiber-reinforced thermoplastic nanocomposites

John Christopher Plummer, Chrystèle Houphouet-Boigny Favre, Martyn Douglas Wakeman

The feasibility of integrating thermoplastic isotactic polypropylene/ montmorillonite nanocomposite matrices into conventional fiber-reinforced composites has been investigated. Two basic processing routes were considered: long glass fiber (GF)-reinforced ...

2008

Deformation and fracture in isotactic polypropylene glass mat thermoplastic composites modified with montmorillonite clay

John Christopher Plummer, Chrystèle Houphouet-Boigny Favre, Sara Dalle Vacche

2008

Mechanical integrity of dye-sensitized photovoltaic fibres

Yves Leterrier, John Christopher Plummer

The development of photovoltaic (PV) devices based on dye-sensitized TiO2-coated Ti fibers has opened up exciting possibilities for novel PV textile applications. The cohesion and adhesion of the TiO2 layer are identified as crucial factors in maintaining ...

2008

Composites and methods for their production

Yves Leterrier, John Christopher Plummer, Marlene Rodlert

Intercalates and exfoliates formed from layered materials and dendritic polymers are disclosed, together with the uses of these materials, e.g. in producing composite materials. The dispersion of layered materials in a dendritic polymer matrix (hyperbranch ...

2008

Improved Materials For Dielectric Elastomer Actuators

Yves Leterrier, Frank Nüesch, John Christopher Plummer, Martin Molberg

2008

Investigation of the Release of Bioactive Volatiles from Amphiphilic Multiarm Star-Block Copolymers by Thermogravimetry and Dynamic Headspace Analysis

John Christopher Plummer, Céline Ternat, Harm-Anton Klok

Amphiphilic multiarm star-block copolymers with a hydrophobic inner and a hydrophilic outer shell have been used to encapsulate hydrophobic bioactive volatiles in aqueous media under realistic application conditions. The release rates of the bioactive comp ...

American Chemical Society2008

NMR diffusion and relaxation studies of the encapsulation of fragrances by amphiphilic multiarm star block copolymers

John Christopher Plummer, Céline Ternat, Harm-Anton Klok

Self-diffusion NMR spectroscopy and relaxometry have been employed to study fragrance encapsulation in water-soluble, amphiphilic star block copolymers. Diffusion coefficients of four different fragrance molecules in the free form and in the presence of th ...

American Chemical Society2007

Glass Fiber Reinforced Polypropylene Nanocomposites

John Christopher Plummer, Véronique Michaud, Chrystèle Houphouet-Boigny Favre, Martyn Douglas Wakeman

2007

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