A group of people sitting together

Ofer Manor

personal Info

Education
BSc 2003, Chemical Engineering, Technion IIT
MSc 2006, Chemical Engineering, Technion IIT 

PhD 2010, Mathematics and Statistics, The University of Melbourne

Research Fields

We use theory and experiment to study physical systems at the interface of colloid science, fluid mechanics, and acoustics. In current active projects we study different phenomena in the fields of pattern deposition, acoustic streaming, and electro–polishing.

We are always looking for motivated graduate students and postdoctoral fellows who are interested in undertaking theoretical or experimental projects. People with background in Engineering, Physics, Chemistry, and Mathematics are welcomed to apply.

To read more about our laboratory please visit our site:

https://chemeng.technion.ac.il/small-scale-transport-research-laboratory/

Research Topics

  • The pattern deposition of polymers and nanoparticles off an evaporating carrier liquid and onto a solid substrate (which is associated with the coffee ring effect) is employed nowadays for the manufacturing of arrays of electrical circuits, touch screens, infrared antennas, Faraday cages, etc. We study the physics of pattern deposition off an evaporating film of a suspension or a solution in a microfluidic confinement. We explore the influence of various mechanisms on the morphology of the deposited colloidal patterns. In particular we study contributions to the pattern deposition from the rate of evaporation of the carrier liquid and the dynamical dewetting of the solid substrate, the inter-molecular mechanisms between the suspended particles and the colloidal stability of the suspension, the thermodynamical properties of the solution, the presence of surface active species, and the geometry of the confinement .

 

  • The response of liquids to high frequency and low power acoustic waves (in particular surface acoustic waves – SAW – and Flexural waves), which is also known as acoustic streaming, is employed in order to actuate and manipulate liquids and particles on microfluidic lab-on-a-chip platforms, enhance mass and heat transport in fluids, repel water off solid surfaces, etc. We undertake several projects in order to explore the interactions between acoustic waves and liquids and applications: (a) We explore the mechanisms that give rise to the greater efficiency of the process of electro–polishing (commonly used in the industry) under the influence of KHz–MHz flexural acoustic waves that are excited in the solid components being polished, (b) we explore liquid drainage and coating over a solid substrates that support MHz surface acoustic waves (SAWs), and (c) we explore the response of systems of pattern deposition to the excitation of MHz surface acoustic waves (SAWs) in the substrate.

Publications

M. Morozov
 and O. Manor. An extended Landau-Levich model for the dragging of a thin liquid film with a propagating surface acoustic wave, Journal of fluids Mechanics, accepted 2016

S. Mhatre, A. Zigelman, L. Abezgauz, and O. Manor. Influence of a Propagating Megahertz Surface Acoustic Wave on the Pattern Deposition of Solute Mass off an Evaporating Solution, Langmuir (DOI: 10.1021/acs.langmuir.6b01341) 2016 http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.6b01341

G. Altshuler and O. Manor. Free films of a partially wetting liquid under the influence of a propagating MHz surface acoustic wave, Phys. Fluids, 28, (072102) 2016 http://dx.doi.org/10.1063/1.4955414

A. Zigelman and O. Manor. A model for pattern deposition off an evaporating solution subject to contact angle hysteresis and finite solubility, Soft Matter, (DOI: 10.1039/C6SM00579A) 2016
http://pubs.rsc.org/en/Content/ArticleLanding/2016/SM/C6SM00579A#!divAbstract

G. Altshuler and O. Manor. Spreading dynamics of a partially wetting water film atop a MHz substrate vibration, Phys. Fluids, 27 (102103) 2015 http://scitation.aip.org/content/aip/journal/pof2/27/10/10.1063/1.4932086

O. Manor. and L. Pismen. Effect of high-frequency in-plane substrate vibration on
a three-phase contact angle, Phys. Fluids, 27 (062101) 2015 http://scitation.aip.org/content/aip/journal/pof2/27/6/10.1063/1.4922054

O. Manor, A. R. Rezk, J. R. Friend and L. Y. Yeo. On the dynamics of liquid films exposed to high frequency surface vibration, Phys. Rev. E 91 (053015) 2015 http://journals.aps.org/pre/abstract/10.1103/PhysRevE.91.053015

O. Manor. Diminution of contact angle hysteresis under the influence of an oscil- lating force, Soft Matter, 30(6841) 2014 http://pubs.acs.org/doi/abs/10.1021/la5006924

A. R. Rezk, O. Manor, J. R. Friend and L. Y. Yeo. Double flow reversal in thin liquid films driven by MHz order surface vibration, Proc. Roy. Soc. A, 470(20130765) 2014

http://rspa.royalsocietypublishing.org/content/470/2169/20130765

O. Manor, J. R. Friend and L. Y. Yeo. Vibration-Induced Wetting, Ency. Surface Colloid Sci., (DOI: 10.1081/E-ESCS-120047379) 2013
http://www.tandfonline.com/doi/abs/10.1081/E-ESCS-120047379#.V6CENGVhK-I

D.J. Collins, A. Winkler, O. Manor, L. Y. Yeo, H. Schmidt and J. R. Friend. Droplet size control using surface acoustic wave atomization, Phys. Rev. E, 86(056312) 2012
https://journals.aps.org/pre/abstract/10.1103/PhysRevE.86.056312

A. R. Rezk, O. Manor, J. R. Friend and L. Y. Yeo. Anomalous film spreading, fingering instabilities and soliton-like wave trains, Nat. Commun., 3(1167) 2012
http://www.nature.com/ncomms/journal/v3/n10/full/ncomms2168.html

O. Manor, L. Y. Yeo, and J. R. Friend. The appearance of boundary layers and
drift flows due to high-frequency surface waves, J. Fluid Mech., 707(482) 2012 http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8690256

O. Manor, T. T. Chau, G. W. Stevens, D. Y. C. Chan, F. Grieser and R. R. Dagastine. Polymeric stabilised emulsions: steric effects and deformation in soft systems. Langmuir, 28(4599) 2012 http://pubs.acs.org/doi/abs/10.1021/la204272u

O. Manor, M. Dentry, L. Y. Yeo, and J. R. Friend. Substrate dependent drop de- formation and wetting under high frequency vibration. Langmuir, 7(7976) 2011 http://pubs.rsc.org/en/Content/ArticleLanding/2011/SM/c1sm06054f#!divAbstract

O. Manor and D. Y. C. Chan. Influence of surfactants on the force between two bubbles. Langmuir 26(655), 2010 http://pubs.acs.org/doi/abs/10.1021/la902243q

O. Manor and D. Y. C. Chan. Terminal Velocity and Mobile Surface Species in Rising Micro-Bubbles. Langmuir 25(8899) 2009
http://pubs.acs.org/doi/abs/10.1021/la901958t

S. A. Edwards, S. L. Carnie, O. Manor and D. Y. C. Chan. Effects of Internal Flow and Viscosity Ratio on Measurements of Dynamic Forces between Deformable Drops. Langmuir 25(3352), 2009 http://pubs.acs.org/doi/abs/10.1021/la8042473

O. Manor, I. U. Vakarelski, G. W. Stevens, F. Grieser, R. R. Dagastine and D. Y. C. Chan. Dynamic forces between bubbles and surfaces and hydrodynamic boundary conditions. Langmuir 24(11533), 2008
http://pubs.acs.org/doi/abs/10.1021/la802206q

O. Manor, I. U. Vakarelski, X. Tang, S. J. O’Shea, G. W. Stevens, F. Grieser, R. R. Dagastine and D. Y. C. Chan. Hydrodynamic boundary conditions and dynamic forces between bubbles and surfaces. Phys. Rev. Lett. 101(024501), 2008 http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.101.024501

D. Y. C. Chan, O. Manor, J. N. Connor and R. G. Horn. From shapes to forces on the nanoscale. Soft Matter 4(471), 2008 http://pubs.rsc.org/en/Content/ArticleLanding/2008/SM/B712924F#!divAbstract

O. Manor, O. Lavrenteva and A. Nir. Effects of non-homogeneous surface viscosity on the Marangoni migration of a droplet in viscous fluid. J. Colloid Interface Sci. 321(142), 2008
http://www.sciencedirect.com/science/article/pii/S0021979708001422