Mordechai Hakham‐Itzhaq

Ariel University

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Self‐Assembly in Evaporated Polymer Solutions: Patterning on Two Scales

Israel Journal of Chemistry (2007)

Edward Bormashenko Gene Whyman Roman Pogreb Oleg Stanevsky Mordechai Hakham‐Itzhaq

Abstract Self‐assembly processes in intensively evaporated polymer solutions, based on chlorinated solvents and amorphous polymers, have been investigated under low and high humidity. Patterning on two scales, mesoscopic and microscopic, has been revealed. The strong dependence of the characteristic size of a mesoscopic pattern on the polymer solution concentration is revealed and studied. Various possible mechanisms of patterning on the two scales are discussed. It has been shown that the widespread hypothesis of micro‐patterning induced with water droplets needs further justification. The influence of substrate defects on the mesoscopic patterning is also investigated.

Mesoscopic physics

10.1560/ijc.47.3-4.319

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Citations (10)

Electrostatically driven droplets deposited on superhydrophobic surfaces

Applied Physics Letters (2009)

Edward Bormashenko Roman Pogreb Tamir Stein Gene Whyman Mordechai Hakham‐Itzhaq

The behavior of dielectric droplets deposited on a superhydrophobic surface and exposed to a constant and uniform electric field is investigated. The change in the droplet shape is described by a linear dependence of its eccentricity on the applied electric field. The proposed control of the droplet shape with the electric field may serve as an alternative to electrowetting technologies.

Eccentricity (behavior)

10.1063/1.3276697

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Citations (18)

Luminescence and absorption spectra of Eu-complex-doped PVDF film: influence of controlled stretch

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2006)

Roman Pogreb Gene Whyman Mikhail Mestechkin Shmuel Sternklar Albina Musin

Poly(vinylidenefluoride) film (PVDF) doped with Eu(III)(NO₃)₃(o-Phenanthroline)₂ complex (complex A) was manufactured using an extrusion technique. Emission spectrum of the film was compared to spectra of the dopant and polyethylene based film. Stretching the film resulted in a sharp growth of intensity and reshaping of the luminescence spectrum. The impact of the PVDF matrix on the photoluminescence spectra of complex A is attributed to the Stark effect. Reasons for the increase of luminescence intensity are discussed. Quantum chemical calculations revealed a marked longwave shift of the lowest triplet and singlet energy levels of complex A compared to free phenanthroline. The amplification and frequency shifting of the luminescent spectrum of europium-complex-doped PVDF may lead to promising applications.

Europium

10.1117/12.643743

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Citations (0)

Experimental demonstration of imaging hidden objects in opaque liquid-based media by fusion of single-shot multiview polarized and unpolarized speckle images

Optics and Lasers in Engineering (2018)

Alex Scherbakov Konstantin Sheverdin Galia Chaimov Mordechai Hakham‐Itzhaq David Abookasis

Opacity

10.1016/j.optlaseng.2018.09.016

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Citations (14)