Self-propulsion of liquid marbles filled with aqueous alcohol solutions and placed on a water surface is reported. The characteristic velocity of the marbles is ca. 0.1 m/s. The phenomenon of self-propulsion is related to the Marangoni solutocapillary flow caused by the condensation of alcohol, evaporated from the liquid marble, on a water surface. The Marangoni flow in turn enhances the evaporation of alcohol from the marbles. Addition of alcohol to the water supporting the marbles suppresses the self-propulsion. The propulsion of liquid marbles is mainly stopped by water drag. The velocity of the center of mass of the marbles increases with an increase in the concentration of alcohol within the marble. The self-propulsion velocity of marbles is independent of their volume. Self-propulsion was not observed when marbles were placed on a glycerol surface.

Leidenfrost effect

10.1021/acs.jpcc.5b01307

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Citations (134)

Interpretation of Elasticity of Liquid Marbles

arXiv (Cornell University) (2015)

Gene Whyman Edward Bormashenko

Liquid marbles are non-stick droplets covered with micro-scaled particles. Liquid marbles demonstrate quasi-elastic properties when pressed. The interpretation of the phenomenon of elasticity of liquid marbles is proposed. The model considering the growth in the marble surface in the course of deformation under the conservation of marbles volume explains semi-quantitatively the elastic properties of marbles in satisfactory agreement with the reported experimental data. The estimation of the effective Young modulus of marbles and its dependence on the marble volume are reported.

Elasticity

10.48550/arxiv.1507.04343

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Benford's Law, its applicability and breakdown in the IR Spectra of polymers

arXiv (Cornell University) (2015)

Edward Bormashenko Evgeny Shulzinger Gene Whyman Ye. Bormashenko

Infrared spectra of various polymers were treated statistically. It was established that for the absorbance spectra the Benford distribution of leading digits takes place, whereas the distribution of leading digits for transmittance spectra is random. This observation may be explained by the fact that the value of transmittance Tr is restricted, due to the physical reasons, whereas the value of absorbance is not. Moreover, the transmittance and absorbance A are interrelated by the logarithmic dependence . This observation supplies the idea that the Benford's law is valid in the situations, when logarithmic dependencies take place.

Absorbance

Benford's law

10.48550/arxiv.1506.03046

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Physical mechanisms of interaction of cold plasma with polymer surfaces

Journal of Colloid and Interface Science (2015)

Edward Bormashenko Gene Whyman Victor Multanen Evgeny Shulzinger Gilad Chaniel

10.1016/j.jcis.2015.02.025

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Citations (74)

Why do pigeon feathers repel water? Hydrophobicity of pennae, Cassie–Baxter wetting hypothesis and Cassie–Wenzel capillarity-induced wetting transition

Journal of Colloid and Interface Science (2007)

Edward Bormashenko Yelena Bormashenko Tamir Stein Gene Whyman Ester Bormashenko

Wetting transition

Penetration (warfare)

Hysteresis

Water repellent

10.1016/j.jcis.2007.02.049

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Citations (209)

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)

Influence of cold radiofrequency air and nitrogen plasmas treatment on wetting of polypropylene by the liquid epoxy resin

Colloids and Surfaces A Physicochemical and Engineering Aspects (2016)

Edward Bormashenko Barak Eldar Gilad Chaniel Victor Multanen Gene Whyman

Polypropylene

Liquid nitrogen

10.1016/j.colsurfa.2016.07.028

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Citations (8)

Revisiting the Fine Structure of the Triple Line

Langmuir (2013)

Edward Bormashenko Albina Musin Gene Whyman Zahava Barkay Michael Zinigrad

The fine structure of the triple line for water droplets deposited on porous polymer substrates was investigated. Substrates were obtained with the breath-figures self-assembly. Water droplets demonstrated the pronounced Cassie-Baxter wetting regime. The triple line was imaged with environmental scanning electron microscopy. The roughness of a triple line was characterized with its averaged root-mean-square (rms) width w(L), and its scaling experimental dependence upon the length L of the triple line w(L) is proportional to L(ζ) was analyzed. The values of exponents in the range of 0.60-063 were established. The deduced values of ζ evidence the local nature of the triple-line elasticity and support the idea that the elastic potential of the triple line includes only even powers of the displacement.

Line (geometry)

Elasticity

10.1021/la403086w

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Citations (24)

The rigorous derivation of Young, Cassie–Baxter and Wenzel equations and the analysis of the contact angle hysteresis phenomenon

Chemical Physics Letters (2007)

Gene Whyman Edward Bormashenko Tamir Stein

Hysteresis

Wetting transition

Solid surface

10.1016/j.cplett.2007.11.033

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Citations (522)