Analysis of liquid suspensions using scanning electron microscopy in transmission: estimation of the water film thickness using Monte-Carlo simulations

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Emergence de flaticons dans les fibres optiques

Nous étudions expérimentalement la propagation non-linéaire d'une onde continue menant à l'émergence d'impulsions au sommet plat et sans dérive de fréquence. Ces impulsions, appelées flaticons, subissent une évolution auto-similaire de leur partie centrale et présentent des oscillations temporelles marquées dans leurs flancs

Mixed percolating network and mechanical properties of polypropylene/talc composites

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Flaticon Pulses in Optical Fibers

We experimentally investigate the nonlinear reshaping of a CW which leads to chirp-free and flat-top intense pulses exhibiting strong temporal oscillations at their edges and a stable self-similar expansion upon propagation of their central region

Electron tomography on latex particles suspended in water using Environmental Scanning Electron Microscopy

International audienceTilted image series are acquired on liquid suspensions of latex particles supported by a carbon membrane. To do so, a home-made stage fitting in an Environmental Scanning Electron Microscope (ESEM) is optimized in order to minimize cold losses and therefore improve both sample stability and spatial resolution in the images. As latex particles are electron-sensitive materials, sample degradation and stability are taken into account in the choice of the parameters for tilted image series acquisition. Despite the limited number of images, conventional algorithms are used to reconstruct the volume and study the three-dimensional arrangement of latex particles. The lattice types are in good agreement with what can be observed on frozen suspensions, although the domain sizes are smaller. Several quantitative parameters such as the latex particle size and the distance to the first neighbors are extracted from the 3D model. Finally, the spatial resolution in the tomograms is estimated using the Crowther's criterion and Fourier Shell Correlation analysis. It is also measured directly by analyzing a suspension containing latex particles and a surfactant of interest for composite formulation

Emergence de flaticons dans les fibres optiques

Nous étudions expérimentalement la propagation non-linéaire d'une onde continue menant à l'émergence d'impulsions au sommet plat et sans dérive de fréquence. Ces impulsions, appelées flaticons, subissent une évolution auto-similaire de leur partie centrale et présentent des oscillations temporelles marquées dans leurs flancs

Experimental generation of optical flaticon pulses

We experimentally investigate the nonlinear reshaping of a continuous wave which leads to chirp-free and flat-top intense pulses or flaticons exhibiting strong temporal oscillations at their edges and a stable self-similar expansion upon propagation of their central region. This study was performed in the normal dispersion regime of a non-zero dispersion-shifted fiber and involved a sinusoidal phase modulation of the continuous wave. Our fiber optics experiment is analogous to considering the collision between oppositely directed currents near the beach, and it may open the way to new investigations in the field of hydrodynamics

Contrast Analysis in Latex/Surfactant Aqueous Suspensions

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Study of the surfactant role in latex-aerogel systems by scanning transmission electron microscopy on aqueous suspensions

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