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Reza  Mohammadi, Ph.D. - VCU College of Engineering. Engineering East Hall, Room E3238, Richmond, VA, US

Reza Mohammadi, Ph.D. Reza  Mohammadi, Ph.D.

Assistant Professor, Department of Mechanical and Nuclear Engineering | VCU College of Engineering

Engineering East Hall, Room E3238, Richmond, VA, UNITED STATES

Expertise: Materials Science and Engineering, Surface Engineering, Wetting Phenomena, Metal Forming, Materials Chemistry

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Industry Expertise (9)

Automotive Ceramics and Glass Design Machinery Energy Manufacturing Mechanical/Industrial Engineering Metalworking and Coatings Technology Nanotechnology

Areas of Expertise (4)

Ultra-incompressible superhard materials Thin film deposition and characterization Superhydrophobic materials Tearing energy of sheet metals

Education (4)

University of California, Los Angeles: Postdoctoral Fellowship, Materials Science and Engineering 2013

University of Alberta: Ph.D., Mechanical Engineering 2008

University of Tehran, Iran: M.Sc., Materials Science and Engineering 1999

Shiraz University, Iran: B.Sc., Metallurgy and Materials Engineering 1997

Patents (2)

Enhanced Mechanical Strength of Chimney Modified Carbon Soot Coatings through a Secondary Chemical Functionalization

USSN 662/323,967

Provisional patent filed on April 18, 2016

Nanowires of Superhard Tungsten Monoboride and Methods of Synthesizing

U.S.62/383,192

Filed on September 2, 2016

Courses (4)

Mechanics of Deformables

200 Level

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Heat Transfer

300 Level

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Continuum Mechanics

500 and 600 Levels

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Mechanical and Nuclear Engineering Materials

600 Level

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Selected Articles (3)

Rational strategy for the atmospheric icing prevention based on chemically functionalized carbon soot coatings Applied Surface Science

2016

Although the superhydrophobic surfaces are preferable for passive anti-icing systems, as they provide water shedding before initiation of ice nucleation, their practical usage is still under debate. This is so, as the superhydrophobic materials are not necessarily icephobic and most of the synthesis techniques are characterized with low fabrication scalability. Here, we describe a rational strategy for the atmospheric icing prevention, based on chemically functionalized carbon soot, suitable for large-scale fabrication of superhydrophobic coatings that exhibit and retain icephobicity in harsh operational conditions. This is achieved through a secondary treatment with ethanol and aqueous fluorocarbon solution, which improves the coating’s mechanical strength without altering its water repellency. Subsequent experimental analyses on the impact dynamics of icy water droplets on soot coated aluminum and steel sheets show that these surfaces remain icephobic in condensate environments and substrate temperatures down to −35 °C. Furthermore, the soot’s icephobicity and non-wettability are retained in multiple icing/de-icing cycles and upon compressed air scavenging, spinning and water jetting with impact velocity of ∼25 m/s. Finally, on frosted soot surfaces, the droplets freeze in a spherical shape and are entirely detached by adding small amount of thermal energy, indicating lower ice adhesion compared to the uncoated metal substrates.

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Superhard Monoborides: Hardness Enhancement through Alloying in W1− xTaxB Advanced Materials

2016

In tungsten monoboride (WB), the boron atoms are linked in parallel serpentine arrays, with tungsten atoms in between. This lattice is metallic, unlike conventional covalent superhard materials such as diamond or cubic boron nitride. By selectively substituting tungsten atoms with tantalum, the Vickers hardness can be increased to 42.8 GPa, creating a new superhard metal.

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Rapid synthesis of inherently robust and stable superhydrophobic carbon soot coatings Applied Surface Science

2016

The fabrication of superhydrophobic coatings using a candle flame or rapeseed oil has become very attractive as a novel approach for synthesis of water repellent surfaces. Here, we report an improved, simplified and time-efficient method for the preparation of robust superhydrophobic carbon soot that does not require any additional stabilizers or chemical treatment. The soot's inherent stabilization is achieved using a specially-designed cone-shaped aluminum chimney, mounted over an ignited paper-based wick immersed in a rapeseed oil. Such configuration decreases the level of oxygen during the process of combustion; altering the ratio of chemical bonds in the soot. As a result, the fractal-like network of the carbon nanoparticles is converted into dense and fused carbon chains, rigidly coupled to the substrate surface. The modified carbon coating shows thermal sustainability and retains superhydrophobicity up to ∼300 °C. Furthermore, it demonstrates a low contact angle hysteresis of 0.7–1.2° accompanied by enhanced surface adhesion and mechanical durability under random water flows. In addition, the soot's deposition rate of ∼1.5 μm/s reduces the exposure time of the substrate to heat and consequently minimizes the thermal effects, allowing the creation of superhydrophobic coatings on materials with low thermal stability (e.g. wood or polyethylene).

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