By K. L. Mittal
This publication is the second one quantity within the sequence "Contact perspective, Wettability and Adhesion." The prime quantity was once released in 2013.
Even a cursory look on the literature express that during fresh years the curiosity in realizing and controlling wetting habit has grown exponentially. at the moment, there's super study task in rendering surfaces superhydrophobic, superhydrophilic, superoleophobic, superoleophilic, omniphobic and omniphilic as a result of their purposes in lots of technologically vital fields. additionally the sturdiness or robustness of fabrics with such great" features is intensely major, in addition to the usage of "green" (biobased) fabrics to procure such surfaces.
This publication containing 19 articles displays more moderen advancements in yes parts lined in its predecessor quantity in addition to it comprises a few themes which have been now not lined sooner than. Concomitantly, this publication offers a medium to maintain abreast of the most recent learn task and advancements within the area of touch attitude, wettability and adhesion.
The themes mentioned comprise: knowing of wetting hysteresis; fabrication of superhydrophobic fabrics; plasma therapy to accomplish superhydrophilic surfaces; hugely liquid repellent textiles; amendment of paper surfaces to regulate liquid wetting and adhesion; Cheerios impression and its keep an eye on; engineering fabrics with superwettability; laser ablation to create micro/nano-patterned surfaces; liquid repellent amorphous carbon nanoparticle networks; mechanical toughness of liquid repellent surfaces; wetting of good partitions and spontaneous capillary move; courting among roughness and oleophilicity; superhydrophobic and superoleophobic eco-friendly fabrics; computational research of wetting on hydrophobic surfaces: program to self-cleaning mechanisms; bubble adhesion to superhydrophilic surfaces; floor unfastened strength of superhydrophobic fabrics; and position of floor loose strength in pharmaceutical capsule tensile strength.
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Extra info for Advances in Contact Angle, Wettability and Adhesion, Volume Two
50) satisfies the Washburn kinetics for cylindrical channels. Let us consider now rectangular cross section channels. 16a). The nanochannels are 900 nm wide with three different depths: 27, 50 and 73 nm. Four different liquids were used: water, a 40% ethanol solution, pure ethanol, and isopropanol. The physical properties of the liquids are tabulated in the literature . 16 (a) View of the horizontal slot (d = 50 nm, w = 900 nm) ; reprinted with permission © Elsevier, 2006. (b) Comparison between experimental results (dots) and model (50) for the travel distance as a function of the square root of time for the four liquids (red-isopropanol, orange-40% ethanol, green-ethanol, and violet-water) in the 50 nm deep channel.
In general, at the scale of microsystems, inertia is negligible. Indeed, the Reynolds number is usually small. Let us recall that the Reynolds number Re is the ratio of the inertial forces to the viscous forces, Re = V w/v , where V is the velocity, w a characteristic geometric scale and v the kinematic viscosity of the liquid. Then a closed-form expression for the travel distance—the distance between channel entrance and the front meniscus of the liquid at a given time—can be derived. 23) Wetting of Solid Walls and Spontaneous Capillary Flow 17 where R is the channel radius, μ the dynamic viscosity of the liquid, γ the surface tension, z the travel distance and t the time.
K. L. London, Laminar flow forced convection in ducts, Advances in Heat Transfer series, Supp. 1, Academic Press, New York (1978). 34. V. J. G. I. Molho, Liquid flows in microchannels, in MEMS : Introduction and Fundamentals, M. ), CRC Press, Boca Raton, FL (2005). 35. M. Bahrami, M. M. Yovanovich and J. R. Culham, A novel solution for pressure drop in singly connected microchannels of arbitrary cross-section, Intl. J. Heat Mass Transfer 50, 2492–2502 (2007). 36. P. V. Garimella, Heat transfer in trapezoidal microchannels of various aspect ratios, Intl.
Advances in Contact Angle, Wettability and Adhesion, Volume Two by K. L. Mittal