Concept

Colloidal crystal

Publications associées (232)

Couche épaisse de nitrure de Gallium ou de nitrure mixte de Gallium et d'un autre métal, procédé de préparation, et dispositif électronique ou optoélectronique comprenant une telle couche

The invention concerns a monocrystalline coating crack-free coating of gallium nitride or mixed gallium nitride and another metal, on a substrate likely to cause extensive stresses in the coating, said substrate being coated with a buffer layer, wherein: a ...

2001

Mechanical properties of a model of attractive colloidal solutions

Giuseppe Foffi, Francesco Sciortino

We review the nature of glass transitions and the glasses arising from a square-well potential with a narrow and deep well. Our discussion is based on the mode coupling theory (MCT), and the predictions of glasses that we make refer to the â€œidealâ€? glas ...

2001

Delayed ettringite formation

Karen Scrivener

Delayed ettringite formation (DEF) can damage concrete that has experienced a temperature above about 70°C. Claims that slow release of sulfate from the clinker can have a similar effect in concrete not thus heated are unsupported. Chemical and microstruct ...

2001

Kinetic Arrest Originating in Competition Between Attractive Interaction and Packing Force

Giuseppe Foffi, Francesco Sciortino

We discuss the situation where attractive and repulsive portions of the interparticle potential both contribute significantly to glass formation. We introduce the square-well potential as prototypical model for this situation, and reject the Baxter model a ...

2000

Universal Aging Features in the Restructuring of Fractal Colloidal Gels

Suliana Manley

We use multispeckle dynamic light scattering to measure the dynamic structure factor, f (q, τ), of gels formed by aggregation of colloids. Although the gel is an elastic solid, f (q, τ) nearly completely decays on long time scales, with an unusual form, f ...

2000

Lead zirconate titanate particle dispersion in thick-film ink formulations

Nava Setter

Diverse device applications for lead zirconate titanate (PZT) ceramics in thick-film form are currently in active development. In the present study, the particle dispersion properties of thick-film ink formulations containing PZT powder have been determine ...

2000

Size Dependence of the Surface Plasmon Enhanced Second Harmonic Response of Gold Colloids: Towards a New Calibration Methods

Hubert Girault, Pierre-François Marie Brevet

Hyper Rayleigh scattering in solution is used for the determination of the first order hyperpolarizability b(colloid) of gold colloids in the size range 5–22 nm; these hyperpolarizabilities are found to range from 0.60 × 10–25 esu for 5 nm diameter colloid ...

1999

Relaxor Pb(Mg1/3Nb2/3)O-3 thin films and their electromechanical properties

Nava Setter, Dragan Damjanovic, Stéphane Hiboux, Andreas Seifert, Zian Kighelman

Pb(Mg1/3Nb2/3)O-3 thin films were prepared from modified alkoxide solution precursors and their dielectric and electromechanical characteristics were investigated. Preparation of the films is very sensitive to processing parameters. The influence of differ ...

1999

Nucleation kinetics on inhomogeneous substrates: Al/Au(111)

Klaus Kern, Harald Brune

We report a quantitative atomic scale study of nucleation kinetics on an inhomogeneous substrate. Our model system, Al/Au(111)-(root 3 x 22), reveals a distinct nucleation transition due to the repulsive nature of surface dislocations. Whereas for T < 200 ...

1999

Interparticle forces and superplasticizers in cement suspensions

Placing of concrete requires much more water than the cement needs for its hydration. This results in a certain porosity in the hardened concrete, which facilitates chemical degradation of this material. By adding small amounts of polymeric admixtures, cal ...

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